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| key features ? wide input, 8.3 - 16 vdc ? programmable output, 0.75 - 5.5 vdc ? monotonic start up into pre-biased output ? under voltage protection ? short circuit protection ? remote sense ? remote on/off ? design for environment (dfe) ? european commission directive 2002/95/ec (rohs) compliant e datasheet dc/dc regulator input 8.3 - 16 v output 16 a pmc 8818t s the pmc series of surface mount dc/dc regulators (pol) are intended to be used as local distributed power sources in distributed power architecture. the high ef - ficiency and high reliability of the pmc series makes them particularly suited for the communications equipment of today and tomorrow. these products are manufactured using the most ad - vanced technologies and materials to comply with en - vironmental requirements. designed to meet high reliability requirements of systems manufacturers, the pmc responds to world-class specifications. ericsson power modules is an iso 9001/14001 certified supplier. contents product program . . . . . . . . . . . . . . . . . . . . . . 2 mechanical data . . . . . . . . . . . . . . . . . . . . . . 2 connections . . . . . . . . . . . . . . . . . . . . . . . . . 2 absolute maximum ratings . . . . . . . . . . . . . 3 input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 product qualification specification . . . . . . . . 4 safety specification . . . . . . . . . . . . . . . . . . . 5 adjusted to 1.0 vout - data . . . . . . . . . . . . . . 6 adjusted to 1.2 vout - data . . . . . . . . . . . . . . 9 adjusted to 1.5 vout - data . . . . . . . . . . . . . 1 2 adjusted to 1.8 vout - data . . . . . . . . . . . . . 1 5 adjusted to 2.5 vout - data . . . . . . . . . . . . . 1 8 adjusted to 3.3 vout - data . . . . . . . . . . . . . 2 1 adjusted to 5.0 vout - data . . . . . . . . . . . . . 2 4 emc specification . . . . . . . . . . . . . . . . . . . . 2 7 operating information . . . . . . . . . . . . . . . . . 2 8 thermal considerations . . . . . . . . . . . . . . . 3 0 soldering information . . . . . . . . . . . . . . . . . 3 1 delivery package information . . . . . . . . . . . 3 2 compatibility with rohs requirements . . . . 3 2 reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 sales offices and contact information . . . . 3 3
en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet pin designation function 1 rc remote control 2 + in input voltage 3 gnd ground 4 + out output voltage 5 vadj output voltage adjust 6 + s remote sensing dim ensions in m m [inch] tolerances (unless specified): x,xx 0,25[0,01] pin true position w ithin 0,4 [0,016] ? 4,83(3x) [0.190] 7,54 < > 7,87 [0.310] 10,92 < > 10,29 [0.405] 3,80 < > 2,6 [0.102] 3 f d p n n f o e f e g p p u q s j o u 5 p q 7 j f x m ax 8,25 [0.324] co-planarity m ax 0,1[0,004] 33,00 [1.299] 13,46 [0.530] 2,70(6x) [0.106] 4,83(3x) [0.190] [0.310] 7,87 7,54 [0.297] 10,29 [0.405] 10,92 [0.430] 1,50(6x) [0.059] < > < > # p u u p n 7 j f x 3 $ * o 4 f o t f 7 b e k 0 v u ( o e connections weight 7 g mechanical data pins material: copper plating: flash gold over nickel product program 3 $ * o 4 f o t f 7 b e k 0 v u ( o e v i v o /i o max p o max ordering no. comment output 1 8.3 - 16v 0.75 - 5.50/16 a 80 w pmc 8818t s released 8.3 - 16v 1.0 v/16 a 16 w pmc 8118na s on request 1.2 v/16 a 19.2 w pmc 8118la s on request 1.5 v/16 a 24 w pmc 8218h s on request 1.8 v/10 a 28.8 w pmc 8218g s on request 2.5 v/10 a 40 w pmc 8419 s on request 3.3 v/16 a 52.8 w pmc 8510 s on requeast 5 v/16 a 80 w pmc 8811 s on request option suffix example negative remote control logic n pmc 8818t sn en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet absolute maximum ratings characteristics min typ max unit t ref maximum operating temperature, see thermal considerations -45 +115 ?c t s storage temperature -55 +125 ?c v i input voltage -0.3 16 vdc v tr input voltage transient -0.3 40 vdc v rc remote control voltage negative logic -0.3 16 vdc positive logic -0.3 16 vdc characteristics conditions min typ max unit v i input voltage range 8.3 12 16 v v loff turn-off input voltage i o max 7.8 v v ion turn-on input voltage i o max 8.0 v c i input capacitance 30 f p ii input idling power i o = 0 a, v i = 12 v v o = 1.00 v 470 560 mw v o = 1.20 v 500 600 mw v o = 1.50 v 550 660 mw v o = 1.80 v 605 725 mw v o = 2.50 v 750 900 mw v o = 3.30 v 910 1090 mw v o = 5.00 v 1150 1410 mw p rc input stand-by power v i = 12 v, rc activated 35 mw v i ac input ripple 1) 20 hz ... 5 mhz v i = 12 v, i o = 1.0 x i o max v o = 1.00 v 170 mv p-p v o = 1.20 v 180 mv p-p v o = 1.50 v 190 mv p-p v o = 1.80 v 210 mv p-p v o = 2.50 v 310 mv p-p v o = 3.30 v 350 mv p-p v o = 5.00 v 540 mv p-p input stress in excess of absolute maximum ratings may cause permanent damage. absolute maximum ratings, sometimes referred to as no destruction limits, are normally tested with one parameter at a time exceeding the limits of output data or electrical characteristics. if exposed to stress above these limits, function and performance may degrade in an unspecified manner. t ref = -30 ... +90 ?c, v i = 8.3...16.0 v unless otherwise specified typ values specified at: t ref = +25 ?c, v i nom, i o max = 16 a fundamental circuit diagram gnd gnd pwm +in +out +sense vadj controller ref gnd error amplifier rc rc gnd block 1) measured with 4 x 4.7 f ceramic capacitors en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet fundamental circuit diagram gnd gnd pwm +in +out +sense vadj controller ref gnd error amplifier rc rc gnd block characteristics min typ max unit t ref operating reference temperature, see pg. 27 -45 +115 ?c t s storage temperature -55 +125 ?c v i input voltage -0.3 +5.5 vdc input stress in excess of absolute maximum ratings may cause permanent damage. absolute maximum ratings, sometimes referred to as no destruction limits, are normally tested with one parameter at a time exceeding the limits of output data or electrical characteristics. if exposed to stress above these limits, function and performance may degrade in an unspecified manner. absolute maximum ratings t ref = -30 ... +90 ?c, v i = 3.0...5.5 v unless otherwise specified typ values specified at: t ref = +25 ?c, v i nom, i o max = 16 a 1) measured with 2 x 22 f ceramic capacitors characteristics conditions min typ max unit v i input voltage range 3.0 5.5 vdc v ioff turn-off input voltage ramp from higher voltage, v out = 1.0- 2.5 v, v in = 3.3 v 2.3 vdc ramp from higher voltage, v out = 3.3 v, v in = 5.0 v 3.4 v ion turn-on input voltage ramp from lower voltage, v out = 1.0- 2.5 v, v in = 3.3 v 2.4 vdc ramp from lower voltage, v out = 3.3 v, v in = 5.0 v 3.5 c i input capacitance 20 f p ii input idling power i o = 0 a, v i = 5.5 v 680 mw p rc input stand-by power (rc active) non operation, v i = 5 v 7.5 mw v i ac input ripple 1) 20 hz ... 5 mhz, i o max, v i = 5 v 400 mv en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet characteristics random vibration jesd 22-b103-b frequency acceleration density 2 ... 500 hz 0.008 ... 0.2 g 2 /hz sinusoidal vibration jesd 22-b103-b frequency acceleration 10 ... 1000 hz 10 g mechanical shock (half sinus) jesd 22-b104-b peak acceleration duration 200 g 1.5 ms lead integrity jesd 22-b105-c weight of 1000 g all terminals temperature cycling jesd 22-a104-b temperature number of cycles -40 ... +125 ?c 300 accelerated damp heat jesd 22-a101-b temperature humidity duration bias +85 ?c 85 % rh 1000 hours max input voltage solderability iec 60068-2-54 (aged according to jesd 22- a101-b, 240h no bias) solder immersion depth time for onset of wetting wetting force 1 mm < 4 s > 100 mn/m cold (in operation) iec 60068-2-1a, test a d temperature duration -45 ?c 72 h high temperature storage jesd 22-a103-b temperature duration +125 ?c 1000 h product qualification specification en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet ericsson power modules dc/dc converters and dc/dc regulators are designed in accordance with safety standards iec/en/ul 60 950, safety of information technology equipment. iec/en/ul60950 contains requirements to prevent injury or damage due to the following hazards: ? electrical shock ? energy hazards ? fire ? mechanical and heat hazards ? radiation hazards ? chemical hazards on-board dc-dc converters are defined as component power supplies. as components they cannot fully comply with the provisions of any safety requirements without conditions of acceptability. it is the responsibility of the installer to ensure that the final product housing these components complies with the requirements of all applicable safety standards and directives for the final product. component power supplies for general use should comply with the requirements in iec60950, en60950 and ul60950 safety of information technology equipment. there are other more product related standards, e.g. iec61204-7 safety standard for power supplies", ieee802.3af ethernet lan/man data terminal equipment power, and ets300132-2 power supply interface at the input to telecommunications equipment; part 2: dc, but all of these standards are based on iec/en/ul60950 with regards to safety. ericsson power modules dc/dc converters and dc/dc regulators are ul 60 950 recognized and certified in accordance with en 60 950. the flammability rating for all construction parts of the products meets ul 94v-0. the products should be installed in the end-use equipment, in accordance with the requirements of the ultimate application. normally the output of the dc/dc converter is considered as selv (safety extra low voltage) and the input source must be isolated by minimum double or reinforced insulation from the primary circuit (ac mains) in accordance with iec/en/ul 60 950. safety specification isolated dc/dc converters. the input voltage to the dc/dc regulator is selv (safety extra low voltage) and the output remains selv under normal and abnormal operating conditions. it is recommended that a slow blow fuse with a rating twice the maximum input current per selected product be used at the input of each dc/dc regulator. non-isolated dc/dc regulators. 24 v dc systems. the input voltage to the dc/dc converter is selv (safety extra low voltage) and the output remains selv under normal and abnormal operating conditions. 48 and 60 v dc systems. if the input voltage to ericsson power modules dc/dc converter is 75 v dc or less, then the output remains selv (safety extra low voltage) under normal and abnormal operating conditions. single fault testing in the input power supply circuit should be performed with the dc/dc converter connected to demonstrate that the input voltage does not exceed 75 v dc. if the input power source circuit is a dc power system, the source may be treated as a tnv2 circuit and testing has demonstrated compliance with selv limits and isolation requirements equivalent to basic insulation in accordance with iec/en/ul 60 950. it is recommended that a fast blow fuse with a rating twice the maximum input current per selected product be used at the input of each dc/dc converter. if an input filter is used in the circuit the fuse should be placed in front of the input filter. in the rare event of a component problem in the input filter or in the dc/dc converter that imposes a short circuit on the input source, this fuse will provide the following functions: ? isolate the faulty dc/dc converter from the input power source so as not to affect the operation of other parts of the system. ? protect the distribution wiring from excessive current and power loss thus preventing hazardous overheating. the galvanic isolation is verified in an electric strength test. the test voltage (v iso ) between input and output is 1500 vdc or 2250 vdc for 60 seconds (refer to product specification). leakage current is less than 1a at nominal input voltage. general information. en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet t ref = -30 ... +90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 41.42 k ? adjusted to 1.0 vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation i o = 0 .01... 1.0 x i o max 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 22 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 24 s i o output current 0 16 a p o max max output power 16 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.00 v 84.4 % efficiency - 100% load i o = i o max, v o = 1.00 v 80.8 83.2 % p d power dissipation i o = i o max, v o = 1.00 v 3.2 3.8 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.00 v 2.4 a mtbf predicted reliability 5 million hours en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w start-up output voltage vs. load current. start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation output characteristics adjusted to 1.0 vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 7 > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to 1.0 vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet t ref = -30 ... +90 c, v i = 8.3 ...16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom, i o max = 16 a. note: +sense connected to +out. r adj 22.46 k ? adjusted to 1. vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation i o = 0 .01... 1.0 x i o max 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 21 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 21 s i o output current 0 16 a p o max max output power 19.2 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.20 v 86.5 % efficiency - 100% load i o = i o max, v o = 1.20 v 81.5 85.4 % p d power dissipation i o = i o max, v o = 1.20 v 3.3 4.4 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.20 v 2.8 a mtbf predicted reliability 5 million hours 10 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output characteristic start-up output voltage vs. load current. start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to 1. vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 7 > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 11 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to 1. vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet t ref = -30 ... +90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 13.05 k ? adjusted to 1. vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation i o = 0 .01... 1.0 x i o max 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 20 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 20 s i o output current 0 16 a p o max max output power 24 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.50 v 88.5 % efficiency - 100% load i o = i o max, v o = 1.50 v 84.2 87.6 % p d power dissipation i o = i o max, v o = 1.50 v 3.4 4.5 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.50 v 3.4 a mtbf predicted reliability 5 million hours 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output characteristic start-up output voltage vs. load current. < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to 1. vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to 1. vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet t ref = C30+90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 9.024 k ? adjusted to 1. vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 2 mv dv o load regulation i o = 0 .01... 1.0 x i o max 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 100 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 18 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 18 s i o output current 0 16 a p o max max output power 28.8 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 1.80 v 89.9 % efficiency - 100% load i o = i o max, v o = 1.80 v 86.1 89.1 % p d power dissipation i o = i o max, v o = 1.80 v 3.5 4.6 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 1.80 v 4.0 a mtbf predicted reliability 5 million hours 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet efficiency output current derating at 1 v input adjusted to 1. vout - typical characteristics output characteristic start-up output voltage vs. load current. efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. power dissipation < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref =+25 c < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output ripple adjusted to 1. vout - typical characteristics transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref =+25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet t ref = -30 ... +90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom. i o max = 16 a. note: +sense connected to +out. r adj 5-009 k ? adjusted to . vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 6 mv dv o load regulation i o = 0 .01... 1.0 x i o max 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 140 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 16 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 16 s i o output current 0 16 a p o max max output power 40 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 2.50 v 91.9 % efficiency - 100% load i o = i o max, v o = 2.50 v 88.8 91.3 % p d power dissipation i o = i o max, v o = 2.50 v 3.8 5.0 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 2.50 v 5.3 a mtbf predicted reliability 5 million hours 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output characteristic start-up output voltage vs. load current. < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to . vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f output current derating at 1 v input available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. 0 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref =+25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to . vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet t ref = -30 ... +90 c, v i = 8.3 ... 16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom . i o max = 16 a. note: +sense connected to +out. r adj 3.122 k ? adjusted to . vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 6 mv dv o load regulation i o = 0 .01... 1.0 x i o max 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12 v 40 s v tr load transient voltage 140 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 17 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 17 s i o output current 0 16 a p o max max output power 52.8 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 3.30 v 93.2 % efficiency - 100% load i o = i o max, v o = 3.30 v 90.6 92.9 % p d power dissipation i o = i o max, v o = 3.30 v 4.0 5.5 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 3.30 v 6.9 a mtbf predicted reliability 5 million hours en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output current derating at 1 v input output characteristic start-up output voltage vs. load current. available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to . vout - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (1 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to . vout - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet t ref = -30 ... +90 c, v i = 8.3 ...16 v unless otherwise specified. input filter 4 x 4.7 f, output filter 2 x 150 f typ values specified at: t ref = +25 c and v i nom . i o max = 16 a. note: +sense connected to +out. r adj 1.472 k ? adjusted to .0 vout - data characteristics conditions output unit min typ max dv oi output voltage adjusted setting t ref = +25 c, v i nom, i o max -2 +2 % v o dv o output voltage tolerance band i o = 0.01...1.0 x i o max -3 +3 % v o dv o idling voltage i o = 0 a -2 +2 % v o dv o line regulation v i min ... v i max, i o max 12 mv dv o load regulation i o = 0 .01... 1.0 x i o max 25 mv t tr load transient recovery time load step = 0.25-0.75-0.25 x i o max, di/dt = 5 a/s, c o = 2 x 150 f, v i = 12v 40 s v tr load transient voltage -150 +190 mv t coeff temperature coefficient t ref = -30 ... +90 c, i o max -0.6 mv/c t s start-up v i on to 0.9 x v o i o = i o max, v i nom 7 ms t r ramp-up, v i ... 0.9 x v o i o = i o max, v i nom 3 ms t f fall time, v i to 0.1 x v o i o = i o max, v i nom 1 ms t f fall time, v i to 0.1 x v o i o = 0 a, v i nom 16 s t rc rc shut-down time 0.1 x v o i o = i o max, v i nom 1 ms t rc rc start-up time 0.9 x v o i o = i o max, v i nom 7 ms t rc rc fall time, 0.1 x v o i o = 0 a, v i nom 15 s i o output current 0 16 a p o max max output power 80 w i lim current limiting threshold t ref < t ref max 19 a v oac output ripple 20 hz ... 5 mhz, i o max 50 mv p-p efficiency - 50% load i o = 0.5 x i o max, v o = 3.30 v 94.9 % efficiency - 100% load i o = i o max, v o = 3.30 v 91.3 94.7 % p d power dissipation i o = i o max, v o = 3.30 v 4.5 7.6 w fo switching frequency i o = (0... 1) x i o max 260 300 340 khz i sense remote sense current 10 ma i i static input current v i = 8.3 v i o = i o max, v o = 3.30 v 10.2 a mtbf predicted reliability 5 million hours en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output current derating at 1 v input output characteristic start-up output voltage vs. load current. available load current vs. ambient air temperature and airflow at vin = 12 v. see conditions on page 30. < " > < 7 > 7 7 7 7 start-up at i o = 16 a resistive load at t ref = +25 c, vin = 12 v. start enabled by connecting v in . top trace: output voltage (2 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. efficiency power dissipation adjusted to .0 v out - typical characteristics efficiency vs. load current and input voltage at t ref = +25 c < " > < > 7 7 7 7 < " > < 8 > 7 7 7 7 dissipated power vs. load current and input voltage at t ref = +25 c general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f < ? $ > < " > n t m g n n t m g n n t m g n n t m g n n t m g n / b u $ p o w turn off turn-off at i o =16 a resistive load at t ref = +25 c, vin = 12 v. turn-off enabled by disconnecting v in . top trace: output voltage (2 v/div.). bottom trace: input voltage (10 v/div.). time scale: 2 ms/div. en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet output ripple transient output voltage response to load current step-change (4-12-4 a) at t ref =+25 c, vin = 12 v. di/dt = 5 a/ s top trace: output voltage (ac) (100 mv/div.). bottom trace: load current (dc) (10 a/div.) time scale: 0.1 ms/div. output voltage ripple (20 mv/div.) at t ref = +25 c, vin = 12 v, i o = 16 a resistive load. band width = 5 mhz. time scale: 2 s/div. adjusted to .0 v out - typical characteristics general conditions: input filter 4 x 4.7 f, output filter 2 x 150 f en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet emc specification the conducted emi measurement was performed using a regulator placed directly on the test bench. the fundamental switching frequency for pmc 8000 is 300 khz. the measurement below has been performed with vin = 12 v, vout = 5 v and max load. input filter 4 x 4.7 f and output filter 2 x 150 f was used during the measurement. 1 s j o u f e $ j s d v u # p b s e & . $ 3 f d j w f s $ p n q v u f s d n d n % $ 1 p x f s 4 p v s d f 3 f t j t u j w f - p b e ? ' 1 p x f s 3 f h v m b u p s layout recommendation -1 0 0 20 40 60 80 100 lev el [d b a] 150 k 300 k 5 00 k 1 m 2 m 3 m 5 m 7 m 1 0m 30m fr eque nc y [h z] m es ep m_ pm c1 6a _1 _pr e pk pmc 8818. conducted emi input terminal value (typ) # / $ $ p o o f d u p s u p 4 d p q f 7 p v u 4 f o t f 5 s j n ( / % - p b e - p x & 4 3 1 p m z n f s $ b q b d j u p s $ p o e v d u p s g s p n 7 p v u u p d b q b d j u p s t n n < j o > y m output ripple and noise test setup output ripple and noise the circuit below has been used for the ripple and noise measure - ments on the pmc 8000 series dc/dc regulators. the radiated emi performance of the dc/dc regulator will be opti - mised by including a ground plane in the pcb area under the dc/ dc regulator. this approach will return switching noise to ground as directly as possible, with improvements to both emissions and susceptibility. en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet vout (v) radj (kohm) vtrim (v) 0.75 open open 1.0 41.42 0.684 1.2 22.46 0.670 1.5 13.05 0.650 1.8 9.024 0.630 2.5 5.009 0.583 3.3 3.122 0.530 5.00 1.472 0.417 5.50 1.212 0.383 circuit configuration for output voltage adjust i n c r e a s e + o u t g n d v a d j l o a d r a d j s e n s e * o d s f b t f 0 v u ( / % 7 b e k - p b e 4 f o t f operating information remote control (rc) standard version with "positive logic". rc regulator condition min typ max unit low level referenced to gnd off -0.3 0.3 v open on 1.7 16 v the rc pin may be used to turn on or turn off the regulator using a suitable open collector function. turn off is achieved by connecting the rc pin to ground. the regulator will run in normal operation when the rc pin is left open. r c + i n m o d u l e + i n g n d input voltage the input voltage range 8.316 vdc makes the pmc 8000 easy to use in intermediate bus applications when powered by a non- regulated bus converter or a regulated bus converter. for output voltage trims over 5.25 vout the input voltage must be reduced to a maximum of 14 v in order to maintain specified data. rc regulator condition min typ max unit high level referenced to gnd off 1.7 16 v open on the rc pin may be used to turn on or turn off the regulator using a suitable open collector function. turn off is achieved by connecting the rc pin to the input voltage. the regulator will run in normal operation when the rc pin is left open. r c v i m o d u l e v i g n d option "negative logic" output voltage adjust (v adj ) all pmc 8000 series dc/dc regulators have an output voltage adjust pin (vadj). this pin can be used to adjust the output voltage above output voltage initial setting (0.75 v). when increasing the output voltage the maximum power rating of the converter remains the same, and the output current capability will therefore decrease correspondingly. to increase the output voltage a resistor or a volt - age signal should be connected/applied between vadj pin and gnd. the resistor/voltage signal value for some standard output trims are given below, for other voltage set points use the formulas to calcu - late the correct resistor or voltage signal. for output voltages of 5.25 v and higher the input voltage is restricted to maximum 14 vin. formula 1: radj = (10 500 / (vout C 0.7525)) C 1000 (ohm) formula 2: vtrim = (0.7 C 0.0667 x (vout C 0.7525)) (v) turn off input voltage the pmc 8000 series dc/dc regulators monitor the input voltage and will turn on and turn off at predetermined levels. the minimum hysteresis between turn on and turn off input voltage is 0.2 v where the turn on input voltage is the highest. en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet all pmc 8000 series dc/dc regulators have a positive remote sense pin that can be used to compensate for moderate amounts of resist - ance in the distribution system and allow for voltage regulation at the load or other selected point. the remote sense line will carry very lit - tle current and does not need a large cross sectional area. however, the sense line on the pcb should be located close to a ground trace or ground plane. the remote sense circuitry will compensate for up to 10% voltage drop between the sense voltage and the voltage at the output pins from v o nom. if the remote sense is not needed the sense pin should be left open or connected to the positive output. remote sense current limit protection the pmc 8000 series dc/dc regulators include current limiting cir - cuitry that allows them to withstand continuous overloads or short circuit conditions on the output. the output voltage will decrease towards zero for output currents in excess of max output current (iomax). when the current limit is reached the regulator will go into hiccup mode. the current limit is temperature dependent, i.e. the limit decrease at higher operating temperature, the regulator is guaranteed to start at i o max x 1.25 @ tref 115c. the regulator will resume normal operation after removal of the overload. the load distribution system should be designed to carry the maximum output short circuit current specified. over temperature protection (otp) the pmc 8000 series dc/dc regulators are protected from thermal overload by an internal over temperature shutdown circuit. when the pcb temperature near the ic circuit reaches 130 c the con - verter will shut down immediately. the regulator will make continu - ous attempts to start up (non-latching mode) and resume normal operation automatically when the temperature has dropped below the temperature threshold. input and output impedance the impedance of both the power source and the load will interact with the impedance of the dc/dc regulator. it is most important to have a low characteristic impedance, both at the input and output, as the regulators have a low energy storage capability. use capacitors across the input if the source inductance is greater than 4.7 h. suitable input capacitors are 22 f - 220 f low esr ceramics. minimum required external capacitors required input filter external input capacitors are required to increase the lifetime of the internal capacitors. low esr ceramics should be used, the mini - mum input capacitance is stated below. pmc 8818t s 2 x 4.7 f. optional input filter to minimize input ripple and to ensure even better stability more capacitors can be added, see table below. consider the max output power in a given application and choose sufficient capacitors to obtain desired ripple level. make sure that the extra capacitors are placed near the input pins. the table below is just an example since the board layout also has effect on the result. required output filter external output capacitance is also required to reduce the output ripple and to obtain specified load step response. it is recom - mended to use low esr polymer capacitors or low esr ceramic capacitors. minimum requirement: pmc 8818t s 2 x 150 f. (low esr polymer type). this is the output filter used in the verification and a requirement to meet the specification. output power desired input ripple (mv p-p ) 150 250 500 0-20 w 2 x 4.7 f ----- ----- 20-40 w 5 x 4.7 f 2 x 4.7 f ----- 40-60 w 8 x 4.7 f 4 x 4.7 f 2 x 4.7 f 60-80 w 11 x 4.7 f 7 x 4.7 f 4 x 4.7 f note: all output characteristics in the datasheet are measured with 4*4.7f at the input pins. maximum capacitive load when powering loads with significant dynamic current requirements, the voltage regulation at the load can be improved by addition of decoupling capacitance at the load. the most effective technique is to locate low esr ceramic capacitors as close to the load as possible, using several capacitors to lower the total esr. these ceramic capacitors will handle short duration high- frequency components of dynamic load changes. in addition, higher values of capacitors (electrolytic capacitors) should be used to handle the mid-frequency components. it is equally important to use good design practice when configuring the dc distribution system. low resistance and low inductance pcb layouts and cabling should be used. remember that when using remote sensing, all resistance (including the esr), inductance and capacitance of the distribution system is within the feedback loop of the regulator. this can affect on the regulators compensation and the resulting stability and dynamic response performance. very low esr and high capacitance must be used with care. a rule of thumb is that the total capacitance must never exceed typically 500-700 f if only low esr (< 2 mw) ceramic capacitors is used. if more capacitance is needed, a combination of low esr type and electrolytic capacitors should be used, otherwise the stability will be affected. the pmc 8000 series regulator can accept up to 8 mf of capacitive load on the output at full load. this gives <500 f/a of i o . when using that large capacitance it is important to consider the selection of output capacitors; the resulting behavior is a combination of the amount of capacitance and esr. operating information 0 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet thermal considerations general the pmc 8000 series dc/dc regulators are designed to operate in a variety of thermal environments, however sufficient cooling should be provided to help ensure reliable operation. heat is removed by conduction, convection and radiation to the surrounding environment. increased airflow enhances the heat transfer via convection. proper cooling can be verified by measuring the temperature at the reference point (t ref ). the pmc 8000 thermal testing is performed with the product mounted on an fr4 board 254 254 mm with 8 layers of 35 m copper. calculation of ambient temperature by using the thermal resistance the maximum allowed ambient temperature can be calculated. 1. the powerloss is calculated by using the formula ((1/ ) - 1) output power = power losses. = efficiency of converter. e.g 88% = 0.88 2. find the value of the thermal resistance for each product in the diagram by using the airflow speed at the output section of the converter. take the thermal resistance x powerloss to get the temperature increase. 3. max allowed calculated ambient temperature is: max t ref of dc/dc regulator C temperature increase. b. 5.11 w 8 c/w = 40.9 c c. 115 c - 40.9 c = max ambient temperature is 74.1 c the real temperature will be dependent on several factors, like pcb size and type, direction of airflow, air turbulence etc. it is recommen - ded to verify the temperature by testing. a. (( ) - 1) 80 w = 5.11 w 1 0.94 e.g v output at 1 m/s, full load, 1 v in: thermal resistance vs. airspeed measured at the regulator. < n t > < ? $ 8 > 7 j o 7 p v u 7 j o 7 p v u 7 j o 7 p v u t r e f n n < j o > " j s g m p x 5 f t u # p b s e a combination of low esr and output capacitance exceeding 8 mf for pmc 8818 can cause the regulator into over current protection mode (hick-up) due to high start up current. the output filter must therefore be designed without exceeding the above stated capacitance levels if the esr is lower then 30-40 mw. parallel operation the pmc 8000 series dc/dc regulators can be connected in paral - lel with a common input. paralleling is accomplished by connecting the output voltage pins directly and using a load sharing device on the input. layout considerations should be made to avoid load imbalance. for more details on paralleling, please consult your local applications support. (max 115 c ) 1 en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet the pmc series dc/dc regulators are intended for reflow soldering processes. extra precautions must be taken when reflow soldering the module. neglecting the soldering information given below may result in permanent damage or significant degradation of the power module performance. no responsibility is assumed if these recommendations are not strictly followed. the module can be reflow soldered using vapour phase reflow (vpr) or forced convection reflow. to ensure proper soldering of the regulators the temperature should be monitored on interconnection pin gnd. the interconnection gnd is considered as representative due to the heavy copper path characterisation. a thermocouple can be attached to the pin gnd by means of a suitable adhesive or heat conductive paste, see the mechanical data on page 4. the reflow profile should be optimised to avoid solder paste drying and overheating of the module. most important is to ensure that the interconnection pins on the coldest aera reach sufficient soldering temperature for sufficiently long time. a sufficiently extended soak time is recommended to ensure an even temperature throughout the pcb, for both small and large components. to reduce the risk of overheating the power module, it is also recommended to minimise the time in reflow as much as possible. for lead free solder processes (solder melting point 217c), the pmc series is qualified for msl 1 according to jedec standard j-std-020c. during reflow, the module temperature must not exceed +245 c at any time. soldering information for conventional sn-pb solder processes (solder melting point 179c -183c), the pmc series is qualified for msl 1 according to jedec standard j-std-020c. during reflow, the module temperature must not exceed +225 c at any time. 0 70 140 210 280 350 0 50 100 150 200 250 300 [c] time reflow ramp-up cooling zone preheat max 3/s soak zone (150c-200c) 60-180s reflow zone max pin temperature @ 225c (low temp solder) @ 245c (high temp solder) (solid line)-high temperature solder (dashed line)-low temperature solder ramp up, ramp-down rate pre-heat soak zone reflow zone cooling max 3 ?c/s max 0.5 ?c/s max 3 ?c/s max 4 ?c/s temperature interval, time soak zone reflow zone 130 -170?c, 60-120 s above 183 ?c, 30-80 s peak temperature, time reflow zone 210 -225?c, 10-30 s low temperature solder - reflow profile ramp up, ramp-down rate pre-heat soak zone reflow zone cooling max 3 ?c/s max 0.5 ?c/s max 3 ?c/s max 4 ?c/s temperature interval, time soak zone reflow zone 150 -200?c, 60-180 s above 220 ?c, 30-80 s peak temperature, time reflow zone 235 -245?c, 10-30 s high temperature solders - reflow profile pin temperatures, graph of the 4-zones of reflow soldering. en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet reliability the mean time between failure (mtbf) of the pmc 8000 series dc/dc regulator family is calculated to be greater than 5 million hours at full output power and a reference temperature of +40 c using telcordia sr 332. the pmc 8000 series regulators are delivered in antistatic tape & reel (eia standards 481-2). tape & reel specification: material: conductive tape width: 44 mm [1.73 in.] tape pitch: 24 mm [0.95 in.] total pocket height: 9.1 mm [0.36 in.] reel diameter: 330 mm [13 in.] reel capacity: 200 pieces full reel weight: typ. 2.0 kg delivery package information 1 * $ , 1 0 * / 5 < > < > 1 * $ , 1 0 * / 5 ' f f e e j s f d u j p o % j n f o t j p o t j o n n < j o d i > 5 b q f m f b e f s n j o < > 5 b q f u s b j m f s n j o < > 4 & $ 5 * 0 / " " " q j u d i < > 3 < > < > ? < > " < > < > < > < > < > < > compatibility with rohs requirements the products are compatible with the relevant clauses and requirements of the rohs directive 2002/95/ec and have a maximum concentration value of 0.1% by weight in homogeneous materials for lead, mercury, hexavalent chromium, pbb and pbde and of 0.01% by weight in homogeneous materials for cadmium. exemptions in the rohs directive utilized in ericsson power modules products include: ? lead in high melting temperature type solder (used to solder the die in semiconductor packages) ? lead in glass of electronics components and in electronic ceramic parts (e.g. fill material in chip resistors) ? lead as an alloying element in copper alloy containing up to 4% lead by weight (used in connection pins made of brass) en/lzt 146 064 r2a ? ericsson power modules, march 2007 pmc 8818t s datasheet sales offices and contact information company headquarters ericsson power modules ab lm ericssons v?g 30 se-126 25 stockholm sweden phone: +46-8-568-69620 fax: +46-8-568-69599 china ericsson simtek electronics co. 33 fuhua road jiading district shanghai 201 818 china phone: +86-21-5990-3258 fax: +86-21-5990-0188 north and south america ericsson inc. power modules 6300 legacy dr. plano, tx 75024 usa phone: +1-972-583-5254 +1-972-583-6910 fax: +1-972-583-7839 hong kong (asia pacific) ericsson ltd. 12/f. devon house 979 kings road quarry bay hong kong phone: +852-2590-2453 fax: +852-2590-7152 italy, spain (mediterranean) ericsson power modules ab via cadorna 71 20090 vimodrone (mi) italy phone: +39-02-265-946-07 fax: +39-02-265-946-69 all other countries contact company headquarters or visit our website: www.ericsson.com/powermodules information given in this data sheet is believed to be accurate and reliable. no responsibility is assumed for the consequences of its use nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of ericsson power modules. these products are sold only according to ericsson power modules general conditions of sale, unless otherwise confirmed in writing. specifications subject to change without notice. germany, austria ericsson power modules ab mhlhauser weg 18 85737 ismaning germany phone: +49-89-9500-6905 fax: +49-89-9500-6911 japan ericsson power modules ab kimura daini building, 3 fl. 3-29-7 minami-oomachi, shinagawa-ka tokyo 140-0013 japan phone: +81-3-5733-5107 fax: +81-3-5753-5162 |
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