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vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 1 of 12 parameter values unit notes +in to -in -1.0 to 60 vdc 100 vdc for 100 ms pc to -in -0.3 to 7.0 vdc +out to -out -0.5 to 50 vdc isolation voltage 2,250 vdc input to output output current 14.8 a continuous peak output current 18.8 a for 1 ms output power 300 w continuous peak output power 450 w for 1 ms case temperature during reflow [a] 225 c msl 5 245 c msl 6, tob = 4 hrs operating junction temperature [b] -40 to 125 c t-grade -55 to 125 c m-grade storage temperature -40 to 125 c t-grade -65 to 125 c m-grade ? 48 v to 24 v v?i chip? bus converter ? 300 watt ( 450 watt for 1 ms) ? high density ? 1017 w /in 3 ? small footprint ? 260 w /in 2 ? low weight ? 0.5 oz (15 g) ? zvs / zcs isolated sine amplitude converter? ? typical efficiency 96 % ? 125c operation (t j ) ? <1 s transient response ? 3.5 million hours mtbf ? no output filtering required b048f240t30 v in = 38 - 53 v v out = 19.0 - 26.5 v i out = 12.5 a k = 1/2 r out = 60.0 m ? max ? bcm tm bus converter output power designator (=p out /10) b 048 f 240 t 30 bus converter input voltage designator product grade temperatures (c) grade storage operating (t j ) t -40 to125 -40 to125 m -65 to 125 -55 to 125 configuration f = j-lead t = through hole output voltage designator (=v out x10) notes: [a] 245c reflow capability applies to product with manufacturing date code 1001 and greater. [b] the referenced junction is defined as the semiconductor having the highest temperature. this temperature is monitored by a shutdown comparator. product description the v ? i chip? bus converter is a high efficiency (> 96 %), narrow input range sine amplitude converter tm (sac tm ) operating from a 38 to 53 vdc primary bus to deliver an isolated 19.0 v to 26.5 v secondary. the bus converter may be used to power non-isolated pol converters or as an independent 19.0 ? 26.5 v source. due to the fast response time and low noise of the bus converter, the need for limited life aluminum electrolytic or tantalum capacitors at the load is reduced?or eliminated? resulting in savings of board area, materials and total system cost. the bus converter achieves a power density of 1017 w /in 3 in a v ? i chip package compatible with standard pick-and-place and surface mount assembly process. the v ? i chip package provides flexible thermal management through its low junction-to-board and junction-to-case thermal resistance. owing to its high conversion efficiency and safe operating temperature range, the bus converter does not require a discrete heat sink in typical applications. low junction-to-case and junction-to-lead thermal impedances assure low junction temperatures and long life in the harshest environments. b 048 f 240 m 30 absolute maximum ratings part numbering
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 2 of 12 specifications parameter min typ max unit note input voltage range 38 48 53 vdc input dv/dt 1 v/s input undervoltage turn on 37.4 vdc input undervoltage turn off 32.8 vdc input overvoltage turn on 53.0 vdc input overvoltage turn off 59.0 vdc input quiescent current 2.6 ma pc low inrush current overshoot 3.5 a using test circuit in figure 20; see figure 1 input current 6.8 adc input reflected ripple current 120 ma p-p using test circuit in figure 20; see figure 4 no load power dissipation 4.0 5.9 w internal input capacitance 1.9 f internal input inductance 5 nh recommended external input capacitance 47 f 200 nh maximum source inductance; see figure 20 input (conditions are at 48 v in , full load, and 25c ambient unless otherwise specified) figure 1 ? inrush transient current at full load and 48 v in with pc enabled figure 2 ? output voltage turn on waveform with pc enabled at full load and 48 v in figure 3 ? output voltage turn on waveform with input turn on at full load and 48 v in figure 4 ? input reflected ripple current at full load and 48 v in input waveforms
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 3 of 12 parameter min typ max unit note output voltage 19.0 26.5 vdc no load 18.3 25.8 vdc full load output power 0 300 w 42 - 53 v in 0 269 w 38 - 53 v in rated dc current 0 14.8 adc p out 300 w peak repetitive power 450 w max pulse width 1ms, max duty cycle 10%, baseline power 50% current share accuracy 5 10 % see parallel operation on page 10 efficiency half load 95.0 95.7 % see figure 5 full load 94.7 95.8 % see figure 5 internal output inductance 1.1 nh internal output capacitance 7.7 f effective value load capacitance 300 f output overvoltage set point 26.5 vdc module will shut down output ripple voltage no external bypass 150 348 mvp-p see figures 7 and 9 3.3 f bypass capacitor 13 mvp-p see figure 8 short circuit protection set point 15.1 adc module will shut down average short circuit current 0.62 a effective switching frequency 3.0 3.4 3.8 mhz fixed, 1.7 mhz per phase line regulation k 0.4950 1/2 0.5050 v out = k ? v in at no load load regulation r out 43.6 60.0 m transient response voltage overshoot 600 mv 100% load step; see figures 10 and 11 response time 200 ns see figures 10 and 11 recovery time 1 s see figures 10 and 11 output overshoot input turn on 0 mv no output filter; see figure 3 pc enable 0 mv no output filter; see figure 2 output turn on delay from application of power 260 ms no output filter; see figure 3 from release of pc pin 65 ms no output filter efficiency vs. output power 88 90 92 94 96 98 0 30 60 90 120 150 180 210 240 270 300 out p ut power ( w ) efficiency (%) figure 5 ? efficiency vs. output power power dissipation 2 4 6 8 10 12 14 0 30 60 90 120 150 180 210 240 270 300 output power ( w ) power dissipation (w) figure 6 ? power dissipation as a function of output power output waveforms specifications (continued) output (conditions are at 48 vin, full load, and 25c ambient unless otherwise specified)
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 4 of 12 figure 8 ? output voltage ripple at full load and 48 v in with 3.3 f ceramic external bypass capacitor and 20 nh of distribution inductance. figure 7 ? output voltage ripple at full load and 48 v in without any external bypass capacitor. ripple vs. output power 25 50 75 100 125 150 175 0 30 60 90 120 150 180 210 240 270 300 output power (w) output ripple (mvpk-pk) figure 9 ? output voltage ripple vs. output power at 48 v in without any external bypass capacitor. figure 10 ? 0 ? 12.5 a load step with 100 f input capacitor and no output capacitor. figure 11 ? 12.5 ? 0 a load step with 100 f input capacitor and no output capacitor. specifications (continued) output waveforms
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 5 of 12 parameter min typ max unit note primary control (pc) dc voltage 4.8 5.0 5.2 vdc module disable voltage 2.4 2.5 vdc module enable voltage 2.5 2.6 vdc current limit 2.4 2.5 2.9 ma source only enable delay time 65 ms disable delay time 20 s see figure 12, time from pc low to output low auxiliary pins (conditions are at 48 vin, full load, and 25c ambient unless otherwise specified) figure 12 ? v out at full load vs. pc disable figure 13 ? pc signal during fault parameter min typ max unit note mtbf mil-hdbk-217f 3.5 mhrs 25c, gb isolation specifications voltage 2,250 vdc input to output capacitance 3,000 pf input to output resistance 10 m input to output agency approvals ctvus ul /csa 60950-1, en 60950-1 ce mark low voltage directive rohs mechanical see mechanical drawings, figures 15 ? 18 weight 0.53/15 oz /g dimensions length 1.28/ 32,5 in / mm width 0.87 / 22 in / mm height 0.265 / 6,73 in / mm thermal overtemperature shutdown 125 130 135 c junction temperature thermal capacity 9.3 ws /c junction-to-case thermal impedance (r jc ) 1.1 c / w see thermal considerations on page 10 junction-to-board thermal impedance (r jb )2.1 c/w general specifications (continued)
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 6 of 12 pin / control functions +in / -in ? dc voltage input ports the v ? i chip? module input voltage range should not be exceeded. an internal undervoltage /overvoltage lockout function prevents operation outside of the normal operating input range. the bcm? bus converter turns on within an input voltage window bounded by the ?input undervoltage turn on? and ?input overvoltage turn off? levels, as specified. the module may be protected against accidental application of a reverse input voltage by the addition of a rectifier in series with the positive input, or a reverse rectifier in shunt with the positive input located on the load side of the input fuse. the connection of the module to its power source should be implemented with minimal distribution inductance. if the interconnect inductance exceeds 100 nh, the input should be bypassed with a rc damper to retain low source impedance and stable operation. with an interconnect inductance of 200 nh, the rc damper may be 47 f in series with 0.3 . a single electrolytic or equivalent low-q capacitor may be used in place of the series rc bypass. pc ? primary control the primary control port is a multifunction node that provides the following functions: enable / disable ? if the pc port is left floating, the bcm? module output is enabled. once this port is pulled lower than 2.4 vdc with respect to ?in, the output is disabled. this action can be realized by employing a relay, opto-coupler, or open collector transistor. refer to figures 1-3, 12 and 13 for the typical enable /disable characteristics. this port should not be toggled at a rate higher than 1 hz. the pc port should also not be driven by or pulled up to an external voltage source. primary auxiliary supply ? the pc port can source up to 2.4 ma at 5.0 vdc. the pc port should never be used to sink current. alarm ? the module contains circuitry that monitors output overload, input overvoltage or undervoltage, and internal junction temperatures. in response to an abnormal condition in any of the monitored parameters, the pc port will toggle. refer to figure 13 for pc alarm characteristics. tm and rsv ? reserved for factory use. +out / -out ? dc voltage output ports two sets of contacts are provided for the +out port. they must be connected in parallel with low interconnect resistance. similarly, two sets of contacts are provided for the ?out port. they must be connected in parallel with low interconnect resistance. within the specified operating range, the average output voltage is defined by the level 1 dc behavioral model of figure 21. the current source capability of the module is rated in the specifications section of this document. the low output impedance of the module reduces or eliminates the need for limited life aluminum electrolytic or tantalum capacitors at the input of pol converters. total load capacitance at the output of the modules should not exceed the specified maximum. owing to the wide bandwidth and low output impedance of the module, low frequency bypass capacitance and significant energy storage may be more densely and efficiently provided by adding capacitance at the input of the bcm module. -in pc rsv tm +in -out +out -out +out bottom view a b c d e f g h j k l m n p r t 4 3 2 1 a b c d e h j k l m n p r t figure 14 ? bcm? bus converter pin configuration signal name designation +in a1-e1, a2-e2 ?in l1-t1, l2-t2 tm h1, h2 rsv j1, j2 pc k1, k2 +out a3-d3, a4-d4, j3-m3, j4-m4 ?out e3-h3, e4-h4, n3-t3, n4-t4
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 7 of 12 mechanical drawings top view ( component side ) bottom view inch mm notes: 1. dimensions are . 2. unless otherwise specified, tolerances are: .x / [.xx] = +/-0.25 / [.01]; .xx / [.xxx] = +/-0.13 / [.005] 3. product marking on top surface dxf and pdf files are available on vicorpower.com recommended land pattern ( component side shown ) inch mm notes: 1. dimensions are . 2. unless otherwise specified, tolerances are: .x / [.xx] = +/-0.25 / [.01]; .xx / [.xxx] = +/-0.13 / [.005] 3. product marking on top surface dxf and pdf files are available on vicorpower.com figure 16 ? bcm? module pcb land layout information figure 15 ? bcm ? module j-lead mechanical outline; onboard mounting
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 8 of 12 top view ( component side ) bottom view notes: 1. dimensions are 2. unless otherwise specified tolerances are: x.x [x.xx] = ?.25 [0.01]; x.xx [x.xxx] = ?.13 [0.005] 3. rohs compliant per cst-0001 latest revision dxf and pdf files are available on vicorpower.com inch (mm) . figure 17 ? bcm? through-hole module mechanical outline notes: 1. dimensions are 2. unless otherwise specified tolerances are: x.x [x.xx] = ?.25 [0.01]; x.xx [x.xxx] = ?.13 [0.005] 3. rohs compliant per cst-0001 latest revision dxf and pdf files are available on vicorpower.com inch (mm) . recommended hole pattern ( component side shown ) figure 18 ? bcm? through-hole module pcb layout information mechanical drawings (continued)
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 9 of 12 configuration options recommended land pattern (no grounding clips) top side shown recommended land pattern (with grounding clips) top side shown notes: 1. maintain 3.50 [0.138] dia. keep-out zone free of copper, all pcb layers. 2. (a) minimum recommended pitch is 39.50 [1.555], this provides 7.00 [0.275] component edge-to-edge spacing, and 0.50 [0.020] clearance between vicor heat sinks. (b) minimum recommended pitch is 41.00 [1.614], this provides 8.50 [0.334] component edge-to-edge spacing, and 2.00 [0.079] clearance between vicor heat sinks. 3. v?i chip? module land pattern shown for reference only; actual land pattern may differ. dimensions from edges of land pattern to push-pin holes will be the same for all full size v?ichip products. 4. rohs compliant per cst-0001 latest revision. 5. unless otherwise specified: dimensions are mm [inch]. tolerances are: x.x [x.xx] = 0.3 [0.01] x.xx [x.xxx] = 0.13 [0.005] 6. plated through holes for grounding clips (33855) shown for reference. heat sink orientation and device pitch will dictate final grounding solution. figure 19 ? hole location for push pin heat sink relative to v ? i chip? module
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 10 of 12 parallel operation the bcm? bus converter will inherently current share when operated in an array. arrays may be used for higher power or redundancy in an application. current sharing accuracy is maximized when the source and load impedance presented to each bus converter within an array are equal. the recommended method to achieve matched impedances is to dedicate common copper planes within the pcb to deliver and return the current to the array, rather than rely upon traces of varying lengths. in typical applications the current being delivered to the load is larger than that sourced from the input, allowing traces to be utilized on the input side if necessary. the use of dedicated power planes is, however, preferable. the bus converter power train and control architecture allow bi- directional power transfer, including reverse power processing from the module output to its input. reverse power transfer is enabled if the module input is within its operating range and the module is otherwise enabled. the bus converter?s ability to process power in reverse improves the module?s transient response to an output load dump. thermal considerations v ? i chip? products are multi-chip modules whose temperature distribution varies greatly for each part number as well as with the input /output conditions, thermal management and environmental conditions. maintaining the top of the b048f240t30 case to less than 100c will keep all junctions within the module below 125c for most applications. the percent of total heat dissipated through the top surface versus through the j-lead is entirely dependent on the particular mechanical and thermal environment. the heat dissipated through the top surface is typically 60%. the heat dissipated through the j-lead onto the pcb board surface is typically 40%. use 100% top surface dissipation when designing for a conservative cooling solution. it is not recommended to use a module for an extended period of time at full load without proper heat sinking. input impedance recommendations to take full advantage of the bcm? bus converter capabilities, the impedance presented to its input terminals must be low from dc to approximately 5 mhz. the source should exhibit low inductance and should have a critically damped response. if the interconnect inductance is excessive, the module input pins should be bypassed with an rc damper (e.g., 47 f in series with 0.3 ohm) to retain low source impedance and proper operation. given the wide bandwidth of the module, the source response is generally the limiting factor in the overall system response. anomalies in the response of the source will appear at the output of the module multiplied by its k factor. the dc resistance of the source should be kept as low as possible to minimize voltage deviations. this is especially important if the module is operated near low or high line as the overvoltage /undervoltage detection circuitry could be activated. input fuse recommendations v ? i chip modules are not internally fused in order to provide flexibility in configuring power systems. however, input line fusing of the modules must always be incorporated within the power system. a fast acting fuse should be placed in series with the +in port. application notes for application notes on soldering, thermal management, board layout, and system design click on the link below: http://www.vicorpower.com/technical_library/application_information/chips / application note
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 page 11 of 12 + + v out c out v in v?i k + + c in i out r c out i q r out r c in l in = 5 nh 1.9 f 1.3 m 83 ma 1/2 ? iout 1/2 ? vin 11.13 m 43.6 m 1 m 7.7 f lout 1.1 nh bcm? bus converter level 1 dc behavioral model for 48 v to 24 v, 300 w bcm? bus converter level 2 transient behavioral model for 48 v to 24 v, 300 w figure 21 ? this model characterizes the dc operation of the bus converter, including the converter transfer function and its losses. th e model enables estimates or simulations of output voltage as a function of input voltage and output load, as well as total converter power dissipation o r heat generation. figure 22 ? this model characterizes the ac operation of the bus converter including response to output load or input voltage transients or steady state modulations. the model enables estimates or simulations of input and output voltages under transient conditions, including resp onse to a stepped load with or without external filtering elements. ? 3.44 nh application note (continued) load + r2 2 k d1 sw1 enable / disable switch input reflected ripple measurement point -in pc rsv tm +in -out +out -out +out bcm? k ro figure 20 ? bcm? module test circuit 10 a fuse c1 47 f electrolytic c3 3.3 f r3 10 m notes: source inductance should be no more than 200 nh. if source inductance is greater than 200 nh, additional bypass capacitance may be required. c3 should be placed close to the load. r3 may be esr of c3 or a separate damping resistor. d1 power good indicator will dim when a module fault is detected. f1 + + v out v in v ? i k + + i out r out i q ? 83 ma 1/2 ? iout 1/2 ? vin 43.6 m
vicorpower.com 800-735-6200 bcm? bus converter b048f240t30 rev. 2.8 2/2012 vicor?s comprehensive line of power solutions includes high density ac-dc and dc-dc modules and accessory components, fully configurable ac-dc and dc-dc power supplies, and complete custom power systems. information furnished by vicor is believed to be accurate and reliable. however, no responsibility is assumed by vicor for its use. vicor components are not designed to be used in applications, such as life support systems, wherein a failure or malfunction could result in injury or death. all sales are subject to vicor?s terms and conditions of sale, which are available upon request. specifications are subject to change without notice. intellectual property notice vicor and its subsidiaries own intellectual property (including issued u.s. and foreign patents and pending patent applications) relating to the products described in this data sheet. interested parties should contact vicor's intellectual property department. the products described on this data sheet are protected by the following u.s. patents numbers: 5,945,130; 6,403,009; 6,710,257; 6,911,848; 6,930,893; 6,934,166; 6,940,013; 6,969,909; 7,038,917; 7,166,898; 7,187,263; 7,361,844; d496,906; d505,114; d506,438; d509,472 and for use under 6,975,098 and 6,984,965 vicor corporation 25 frontage road andover, ma, usa 01810 tel: 800-735-6200 fax: 978-475-6715 email customer service: custserv@vicorpower.com technical support: apps@vicorpower.com warranty vicor products are guaranteed for two years from date of shipment against defects in material or workmanship when in normal use and service. this warranty does not extend to products subjected to misuse, accident, or improper application or maintenance. vicor shall not be liable for collateral or consequential damage. this warranty is extended to the original purchaser only. except for the foregoing express warranty, vicor makes no warranty, express or implied, including, but not limited to, the warranty of merchantability or fitness for a particular purpose. vicor will repair or replace defective products in accordance with its own best judgement. for service under this warranty, the buyer must contact vicor to obtain a return material authorization (rma) number and shipping instructions. products returned without prior authorization will be returned to the buyer. the buyer will pay all charges incurred in returning the product to the factory. vicor will pay all reshipment charges if the product was defective within the terms of this warranty. information published by vicor has been carefully checked and is believed to be accurate; however, no responsibility is assumed for inaccuracies. vicor reserves the right to make changes to any products without further notice to improve reliability, function, or design. vicor does not assume any liability arising out of the application or use of any product or circuit; neither does it convey any license under its patent rights nor the rights of others. vicor general policy does not recommend the use of its components in life support applications wherein a failure or malfunction may directly threaten life or injury. per vicor terms and conditions of sale, the user of vicor components in life support applications assumes all risks of such use and indemnifies vicor against all damages.

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