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APR3415 document number: ds367 38 rev. 5 - 2 1 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product secondary side synchronous rectification switcher description APR3415 is a secondary side combo ic, which combines an n - channel mosfet and a driver circuit designed for synchronous rect ification (sr) in dcm operation. it also integrates ou tput voltage detect function for primary side control system. the n - channel mosfet has been optimized for low gate charge, low r ds(on) , fast switching speed and body diode reverse recovery performance. the synchronous rectification can effectively reduc e the secondary side rectifier power dissipation and provide high performance solution. by sensing mosfet drain - to - source voltage, APR3415 can output ideal drive signal with less external components. it can provide high performance solution for 5v output v oltage application. same as ap4341, APR3415 detects the output voltage and provides a periodical signal when the output voltage is lower than a certain threshold. by fast response to secondary side voltage, APR3415 can effectively improve the transient pe rformance of primary side control system. the APR3415 is available in so - 8 package. features ? synchronous rectification for dcm operation flyback ? eliminate resonant ring interference ? fast detector of supply voltages ? fewest ext ernal components ? totally lead - free & fully rohs compliant (note s 1 & 2 ) ? halogen and antimony free. green device ( note 3 ) pin assignments ( top view) s o - 8 applications ? adapters/chargers for cell/cordless phon es, adsl m odems, mp3 and other portable apparatus ? standby and auxiliary power supplies note s : 1 . no purposely added lead. fully eu directive 2002/95/ec (rohs) & 2011/65/eu (rohs 2) compliant. 2 . see http://www.diodes.com/quality/lead_free.html f or more information about diodes incorporateds definitions of hal ogen - and antimony - free, "green" and lead - f ree . 3 . halogen - and antimony - free "green products are defined as those which contain <900ppm bromine, <900ppm chlorine (< 1500ppm total br + cl) and <1000ppm antimony compounds . typical applications circuit 1 2 3 4 8 7 6 5 d r i s r v d e t a r e f v c c d r a i n d r a i n g n d g n d + c 2 1 + c 2 2 a p r 3 4 1 5 r 2 4 v c c a r e f d r a i n d r a i n g n d g n d v d e t d r i s r r 2 2 c 2 3 r 2 1 c 2 4 r 2 3
APR3415 document number: ds367 38 rev. 5 - 2 2 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product pin description s pin number pin name function 1 drisr synchronous rectification mosfet drive 2 vdet synchronous rectification sense input and dynamic function output, connected to drain through a resistor 3 aref program a voltage reference with a resistor from aref to gnd, to enable synchronous rectification mosfet drive signal 4 vcc power supply, connected with system output 5, 6 g nd source pin of internal mosfet, connected to ground 7, 8 drain drain pin of internal mosfet functional block diagram v r e f c o u n t e r t o n p d e t d y n a m i c o s c i n t e g r a t o r ( v d e t - v c c ) * t o n p s r d r i v e r o v p i o v p v d e t i a r e f g n d v d e t v c c a r e f d r i s r d r a i n 1 2 3 4 7 , 8 5 , 6
APR3415 document number: ds367 38 rev. 5 - 2 3 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product absolute maximum ratings (note 4 ) symbol parameter value unit v cc supply voltage - 0.3 to 7.5 v v det, v drain voltage at vdet, drain pin - 2 to 50 v v aref, v drisr voltage at aref, drisr pin - 0.3 to 6 v i d continuous drain current 15 a i dm pulsed drain current 60 a p d power dissipation at t a = + 25 oc 0.7 w ja thermal resistance (junction to ambient) (note 5) 170 oc /w j c thermal resistance (junction to case) (note 5) 24 oc /w t j operating junction temperature + 150 oc t stg storage temperature - 65 to + 150 oc t lead lead temperature (soldering, 10 sec) + 3 00 oc note s: 4 . stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are stres s ratings only, and functional operation of the device at these or any other conditions beyond those indicat ed under recommended operating conditions is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. 5. fr - 4 substrate pc board, 2oz copper, with 1 inch 2 pad layout . recommended operating conditions symbol parameter min max unit v cc supply voltage 3.3 6 v t a ambient temperature - 40 + 85 oc
APR3415 document number: ds367 38 rev. 5 - 2 4 of 1 3 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product electrical characteristics ( @ t a = + 25c, v cc =5v, unless otherwise specified . ) symbol parameter conditions min typ max unit supply voltage ( vcc pin ) i startup startup current v cc =v startup - 0.1v C 100 150 a i op operating current vdet pin floating v cc =v trigger +20mv 40 100 150 a v startup startup voltage C 2. 6 3.1 3.4 v C uvlo C 2. 3 2.8 3.1 v dynamic output section/oscillator section v trigger internal trigger voltage C 5. 2 5 5. 3 5. 3 5 v C duty cycle C 4 8 12 % t osc oscillation period v cc =5v 18 30 37.5 s i trigger internal trigger current v cc =v trigger , vcc/vdet pin is separately connected to a 20 resistor 30 C 42 ma t dis minimum period C 18 30 37.5 ms v dis discharge voltage C 5. 28 5. 4 4 5. 5 2 v i dis discharge current v cc =v dis +0.1v 1.5 3 4.5 ma v dis - v trigger trigger discharger gap C 30 110 C mv v ovp overshoot voltage for discharge C 5. 8 5. 9 6.0 v i ovp overshoot current for discharge v cc =v ovp +0.1v, vcc pin is connected to a 20 resistor 40 C 100 ma synchronous voltage detect v thon gate turn on threshold C 0 C 1 v v thoff gate turn off threshold C - 20 - 12.5 - 5 mv t don turn on delay time from v thon to v drisr =1v C 70 130 ns t doff turn off propagation delay time from v thoff to v drisr =3v C 100 150 ns t rg gate turn on rising time from 1v to 3v, c l =4.7nf C 50 100 ns t fg gate turn off falling time from 3v to 1v, c l =4.7nf C 50 100 ns t leb_s minimum on time (v det - v cc )*t onp = 25v s 0.9 1.8 2.7 s t leb_l (v det - v cc )*t onp = 50 v s C C 6.5 v drisr_high drive output voltage v cc =5v 3.7 C C v v s_min sr minimum operating voltage (note 6 ) C C C 4.5 v t ovp_last added ovp discharge time C C 2. 0 C ms kqs (note 7 ) (v det - v cc )*t onp = 25v s 0.325 C 0.625 ma* s note s: 6 . this item s pecifies the minimum sr operating voltage of v in_dc , v in_dc n ps *v s_min . 7 . this item is used to specify the value of r aref .
APR3415 document number: ds367 38 rev. 5 - 2 5 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product electrical characteristics ( @ t a = + 25c , unless otherwise specified . cont. ) mosfet static characteristi cs parameters symbol conditions min typ max unit drain to source breakdown voltage v dss(br) v gs =0v, i d =0.25ma 50 C C v gate threshold voltage v gs(th) v ds =v gs , i d =0.25ma 0.5 0.9 2 v zero gate voltage drain current i dss v ds =50v, v gs =0v C C 1 a gate to source leakage current i gss v gs =10v, v ds =0v C C 10 a drain to source on - state resistance r ds(on) v gs =4.5v, i d =15a 12 17 30 m mosfet dynamic characteristics parameters symbol conditions min typ max unit input capacitance c iss v gs =0v, v ds =25v, f=1mhz C 1316 C pf output capacitance c oss C 97 C reverse transfer capacitance c rss C 85 C gate to source charge q gs v gs =0v to 10v, v dd =25v, i d =15a C 3.2 C nc gate to drain charge (miller charger) q gd C 5.7 C total gate charge q g C 15.2 C gate resistance r g C C 0.85 C
APR3415 document number: ds367 38 rev. 5 - 2 6 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product performance characteristics startup voltage vs . temperature uv lo vs . temperature internal trigger voltage vs. temperature internal trigger current vs. temperature overshoot voltage for discharge vs. temperature overshoot current for discharge vs. temperature -40 -20 0 20 40 60 80 100 120 140 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 internal trigger voltage (v) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 0 20 40 60 80 100 120 140 160 overshoot current for discharge (ma) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 1.0 1.5 2.0 2.5 3.0 3.5 uvlo (v) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 2.00 2.25 2.50 2.75 3.00 3.25 3.50 startup voltage (v) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 0 10 20 30 40 50 60 70 80 internal trigger current (ma) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 5.0 5.2 5.4 5.6 5.8 6.0 overshoot voltage for discharge (v) temperature ( o c)
APR3415 document number: ds367 38 rev. 5 - 2 7 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product performance characteristics ( cont.) gate turn off threshold vs. temperature kqs (see note 7) vs. temperature operating current vs. temperature drain to source on - state resistance vs. temperature -40 -20 0 20 40 60 80 100 120 140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 kqs (ma* ? s) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 0 5 10 15 20 25 30 35 40 45 50 drain to source on-state resistance (m ? ) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 0 20 40 60 80 100 120 140 operating current ( ? a) temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 -40 -30 -20 -10 0 gate turn off threshold (mv) temperature ( o c)
APR3415 document number: ds367 38 rev. 5 - 2 8 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product output voltage detect function description figure 1 . typical waveforms of APR3415 when v cc is beyond power - on voltage (v on ), the APR3415 starts up. the vdet pin asserts a periodical pulse and the oscillation period is t osc . when v cc is beyond the trigger voltage (v trigger ), the periodical pulse at vdet pin is discontinued. when v cc is beyond the discharge voltage (v dis ), the discharge circuit will be enabled, and a 3ma current ( i dis ) will flow into vcc pin. when v cc is higher than the overshoot voltage (v ovp ), th e a pr34 15 will enable a discharge circuit, the discharge current ( i ovp ) will last t ovp_last time. after the t ovp_last time, a pr34 15 will stop the discharge current and detect vcc voltage again. if v cc is still higher than v ovp , the t ovp_last time discharge current will be enable d again. once the ovp discharge current is asserted , the periodical pulse at vdet pin will be disabled. when the v cc falls below the power - off voltage (v off ), the APR3415 will s hut down. o peration description mosfet driver the operation of the sr is described with timing diagram shown in f igure 2 . APR3415 monitors the mosfet d rain - s ource voltage. when the d rain voltage is lower than the turn - on threshold voltage v thon , the i c outputs a positive drive voltage after a turn - on delay time (t don ). the mosfet will turn on and the current will transfer from the body diode into the mosfets channel. in the process of d rain current decreasing linearly toward zero, the d rain - s ource vo ltage rises synchronically. when it rises over the turn off threshold voltage v thoff , APR3415 pulls the drive signal down after a turn off delay (t doff ). figure 2 . typical waveforms of APR3415 v d e t v c c v o n v t r i g g e r v o f f t o s c v o v p v t r i g g e r i v c c i d i s u v l o v d i s v d i s i o v p t d i s t d i s t d i s t d i s t d i s t d i s t o s c t o v p _ l a s t i , v t t i s v d e t v d r i s r v t h o n v t h o f f 0 . 1 v d r i s r 0 . 9 v d r i s r 0 . 1 v d r i s r 0 . 9 v d r i s r t r g t d o n t f g t d o f f 0 0
APR3415 document number: ds367 38 rev. 5 - 2 9 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product o peration description (cont. ) minimum on time when the controlled mosfet gate is turned on, some ringing noise is generated. the minimum on - time timer blanks the v thoff comparator, keeping the controlled mosfet on for at least the minimum on time. if v thoff falls below the threshold be fore minimum on t ime expires , the mosfet will keep on until the end of the minimum on time. the minimum on time is in direct proportion to the (v det - v cc )*t onp . when (v det - v cc )*t onp =5v* 5 s , the minimum on time is about 1.8 s. the value and meaning of aref resistor as to dcm operation flyback converter, after secondary rectifier stop s conduction the primary m osfet drain - to - source ringing waveform is result ed from the resonant of primar y inductance and equivalent switch device output capacitance. this ringing waveform probably leads to synchronous rectifier error conduction. to avoid this fault happening, a pr34 15 has a special function design by means of volt - second product detecting . fr om the sensed voltage of vdet pin to see, the volt - second product of voltage above vcc at primary switch on time is much higher than the volt - second product of each cycle ringing voltage above v cc . therefore, before every time synchronous rectifier turning on, APR3415 judges if the detected volt - second product of vdet voltage above v cc is higher than a threshold and then turn on synchronous rectifier. the purpose of aref resistor is to determine the volt - second product threshold. APR3415 has a parameter, kq s, which converts r aref value to volt - second product . in general, area1 and area3 value depend on system design and always are fixed after system design frozen . as to bcd psr design, the area1 value changes with primary peak curre nt value and area3 value generally keeps constant at all of conditions. so the aref resistor design should consider the worst case, the minimum primary peak current condition. since of system design parameter distribution, area1 and area3 have moderate tol erance. so area2 should be designed between the middle of area1 and area3 to keep enough design margin. figure 3 . aref function sr minimum operating voltage APR3415 sets a minimum sr operating volt age by comparing the difference between v det and output voltage (v cc ). the value of v det C v cc must be higher than its internal reference, then APR3415 will begin to integrate the area of (v det C v cc )*t onp . if not, the area integrating will not begin and the s r driver will be disabled. kqs * r 2 area aref ? area1 kqs * r 3 area aref ? ? v d e t v c c a r e a 3 a r e a 1 = ( v d e t - v c c ) * t o n p a r e a 2 = k q s * r a r e f
APR3415 document number: ds367 38 rev. 5 - 2 10 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product ordering information package temperature range part number marking id packing so - 8 - 4 0 to + 85 ? c APR3415 mtr - g1 3415m - g1 4000/ tape & reel marking information ( top view) first a nd s econd li nes : logo and marking id third l ine : date code y: y ear ww: w ork w eek of m olding a: a ssembly h ouse c ode xx: 7 th and8 th d igits of batch no. 3415 m - g1 ywwaxx - a p r 3 4 1 5 x x x - x x p a c k i n g p a c k a g e t r : t a p e & r e e l m : s o - 8 g 1 : g r e e n p r o d u c t n a m e r o h s / g r e e n
APR3415 document number: ds367 38 rev. 5 - 2 11 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product package outline dimensions (all d imensions in mm (inch) . ) (1) package t ype: s o - 8 0 8 1 7 r 0 . 1 5 0 ( 0 . 0 0 6 ) r 0 . 1 5 0 ( 0 . 0 0 6 ) 1 . 0 0 0 ( 0 . 0 3 9 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 5 1 0 ( 0 . 0 2 0 ) 1 . 3 5 0 ( 0 . 0 5 3 ) 1 . 7 5 0 ( 0 . 0 6 9 ) 0 . 1 0 0 ( 0 . 0 0 4 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 3 . 8 0 0 ( 0 . 1 5 0 ) 4 . 0 0 0 ( 0 . 1 5 7 ) 7 7 2 0 : 1 d 1 . 2 7 0 ( 0 . 0 5 0 ) t y p 0 . 1 5 0 ( 0 . 0 0 6 ) 0 . 2 5 0 ( 0 . 0 1 0 ) 8 d 5 . 8 0 0 ( 0 . 2 2 8 ) 6 . 2 0 0 ( 0 . 2 4 4 ) 0 . 6 0 0 ( 0 . 0 2 4 ) 0 . 7 2 5 ( 0 . 0 2 9 ) 0 . 3 2 0 ( 0 . 0 1 3 ) 8 0 . 4 5 0 ( 0 . 0 1 7 ) 0 . 8 2 0 ( 0 . 0 3 2 ) 4 . 7 0 0 ( 0 . 1 8 5 ) 5 . 1 0 0 ( 0 . 2 0 1 ) n o t e : e j e c t h o l e , o r i e n t e d h o l e a n d m o l d m a r k i s o p t i o n a l . o p t i o n 1 o p t i o n 1 o p t i o n 2 0 . 3 5 0 ( 0 . 0 1 4 ) t y p t y p t y p 9 ~ 9 ~
APR3415 document number: ds367 38 rev. 5 - 2 12 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product suggested pad layo ut (1) package t ype: s o - 8 dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e (mm)/(inch) value 6.900/0.272 3.900/0.154 0.650/0.026 1.500/0.059 1.270/0.050 g r i d p l a c e m e n t c o u r t y a r d z g y e x
APR3415 document number: ds367 38 rev. 5 - 2 13 of 13 www.diodes.com december 2014 ? diodes incorporated a pr3415 a product line of diodes incorporated ne w product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisd iction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. diodes incorporated does not as sume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license unde r its patent or trademark rights, nor the rights of others. any customer or user of this doc ument or products described herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diod es incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthor ized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, c ustomers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product nam es and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of this document is the final and determinative format released by diodes incorporated. life support diodes incorpora ted products are specifically not authorized for use as critical components in life support devices or systems without the ex press written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to r esult in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expe cted to cause the failure of the life support device or to affect its safety or e ffectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety - r elated requirements concerning their products and any use of diodes incorporated products in such safety - critical, life support devices or systems, notwithstanding any devices - or systems - related information or support that may be provided by diodes incorp orated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life support devices or systems. copyright ? 201 4 , diodes inco rporated www.diodes.com

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