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APR343 document number: ds 36884 rev . 4 - 2 1 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product secondary side synchronous rectification controller description APR343 is a secondary side mosfet driver for synchronous rectification in dcm operation, which integrates the output voltage detection f unction f or primary side control system. the synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. by sensing mosfet drain - to - source voltage, APR343 can output ideal drive signal with less external components . it can provide high performance solution for 5v output voltage application. same as ap4341, APR343 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, APR343 can effectively improve the transient performance of primary side control system. the APR343 is available in sot25 package. features ? synchronous r ectification for dcm operation flyback ? eliminate resonant ring interference ? fast detector of supply voltage ? fewest external components ? totally lead - free & fully rohs compliant (note s 1 & 2) ? halogen and antimony free. green device (note 3) pin assignments ( top view) sot25 applications ? adapters/chargers for cell/cordless phones, 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 for 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 whic h contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds . typical applications circuit + r 2 0 c 2 1 c 2 0 g n d v d e t d r i s r v c c a r e f t 1 q 2 r 2 1 r 2 2 c 2 2 a p r 3 4 3 5 1 3 4 2 d r i s r g n d v c c a r e f v d e t 1 2 3 4 5
APR343 document number: ds 36884 rev . 4 - 2 2 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product pin description s pin number p in name function 1 drisr synchronous rectification mosfet gate drive 2 gnd ground 3 vcc power supply, connected with system output 4 aref program a voltage reference with a resistor from aref to gnd, to enable synchronous rectification mosfet drive signal 5 vdet synchronous rectification sense input and dynamic function output, connected with secondary winding functional block diagram v c c v d e t g n d 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 a r e f d r i s r s r d r i v e r o v p i o v p v d e t i a r e f 1 2 3 4 5
APR343 document number: ds 36884 rev . 4 - 2 3 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product absolute maximum ratings (note 4 ) symbol parameter rating unit v cc supply voltage - 0.3 to 7.5 v v det voltage at vdet pin - 2 to 50 v v aref, v drisr voltage at aref, drisr pin - 0.3 to 6 v C output current at vdet internally limited a p d power dissipation at t a = + 25 oc 0.6 w t j operating junction temperature + 150 oc t stg storage temperature - 65 to + 150 oc C lead temperature (soldering, 10 sec) + 300 oc ja thermal resistance ( junction to ambient ) 197 oc /w j c thermal resistance ( junction to case ) 76 oc /w note 4 : stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are str ess ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. recommended operating conditions symbol parameter min max unit v cc supply voltage 0 6 v t a ambient temperature - 40 + 85 oc
APR343 document number: ds 36884 rev . 4 - 2 4 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product electrical characteristics (@ v cc = 5 v, t a = + 25 ? c , unless othe rwise specified .) symbol parameters 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 5.25 5.3 5.35 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 5.44 5.52 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 rectification detection and drive 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 turn on rising time from 1v to 3v, c l = 4.7nf C 50 100 ns t fg 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 s ynchronous r ectification (sr) minimum operating voltage (note 5 ) C C C 4.5 v t ovp_last added ovp discharge time C C 2.0 C ms kqs (note 6 ) (v det - v cc )*t onp = 25v s 0.325 C 0.625 ma* s note s : 5 . this item specifies the minimum sr operating voltage of v in_dc , v in_dc n ps *v s_min . 6. this item is used to specify the value of r aref .
APR343 document number: ds 36884 rev . 4 - 2 5 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new 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 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 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 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 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 5.0 5.2 5.4 5.6 5.8 6.0 overshoot voltage for discharge (v) temperature ( o c)
APR343 document number: ds 36884 rev . 4 - 2 6 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product performance characteristics ( cont .) gate turn off threshold vs . temperature kqs (see note 6 ) vs . temperature operating current 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 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)
APR343 document number: ds 36884 rev . 4 - 2 7 of 1 2 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product output voltage detection function description figure 1 . typical waveforms 1 of APR343 when v cc is beyond power - on voltage (v on ), the APR343 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 ), the APR343 will enable a discharge circuit, the discharge current ( i ovp ) will last t ovp_last time. after the t ovp_last time, APR343 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 asser ted , the periodical pulse at vdet pin will be disabled. when the v cc is below the p ower - off v oltage (v off ), the APR343 will be shut down. mosfet driver operation description figure 2 . typical waveforms 2 of ap r3 43 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
APR343 document number: ds 36884 rev . 4 - 2 8 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product mosfet driver operation description (cont.) the operation of the sr is described with timing diagram shown in f igure 2 . APR343 monitors the mosfet d rain - s ource voltage. when the d rain voltage is lower than the turn - on threshold voltage v thon , the ic 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 lin early toward zero, the d rain - s ource voltage rises synchronically. when it rises over the turn off threshold voltage v thoff , APR343 pulls the drive signal down after a turn off delay (t doff ). 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 before minimum on t ime expires , the mosfet will keep on until th e 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 primary inductance and equivalent switch device output capacitance. this ringing waveform probably leads to synchron ous rectifier error conduction. to avoid this fault happening, a pr34 3 has a special function design by means of volt - second product detecting . from the sensed voltage of vdet pin to see, the volt - second product of voltage above v cc 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, APR343 judges if the detected volt - second product of vdet voltage above v cc is hi gher than a threshold and then turn on synchronous rectifier. the purpose of aref resistor is to determine the volt - second product threshold. APR343 has a parameter, kqs, which converts r aref value to volt - second product . in genera l, 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 current value and area3 value generally keeps constant at all of conditions. so the aref resi s tor design should consider the worst case, the minimum primary peak current condition. since of system desi gn parameter distribution, area 1 and area3 have moderate tolerance. 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 APR343 sets a minimum sr operating voltage 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 APR343 will begin to integrate the area of (v det C v cc )*t onp . if not, the area integrating will not begin and the sr driver will be disab led . kqs * r 2 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 area1 kqs * r 3 area aref ? ?
APR343 document number: ds 36884 rev . 4 - 2 9 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product ordering information package temperature range part number marking id packing sot25 - 40 ? c to +85 ? c apr34 3k tr - g1 ghz 3000 / tape & reel mark ing information (top view) : logo ghz : marking id p a c k i n g p a c k a g e p r o d u c t n a m e t r : t a p e & r e e l k : s o t 2 5 g 1 : g r e e n a p r 3 4 3 x x x C r o h s / g r e e n
APR343 document number: ds 36884 rev . 4 - 2 10 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product package outline dimensions (all d imensions in mm (inch) . ) (1) package t ype: sot25 2 . 8 2 0 ( 0 . 1 1 1 ) 2 . 6 5 0 ( 0 . 1 0 4 ) 1 . 5 0 0 ( 0 . 0 5 9 ) 0 . 0 0 0 ( 0 . 0 0 0 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 9 5 0 ( 0 . 0 3 7 ) 0 . 9 0 0 ( 0 . 0 3 5 ) 0 . 1 0 0 ( 0 . 0 0 4 ) 0 . 2 0 0 ( 0 . 0 0 8 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 8 0 3 . 1 0 0 ( 0 . 1 2 2 ) 1 . 7 0 0 ( 0 . 0 6 7 ) 3 . 0 0 0 ( 0 . 1 1 8 ) 0 . 5 0 0 ( 0 . 0 2 0 ) 0 . 1 5 0 ( 0 . 0 0 6 ) 1 . 3 0 0 ( 0 . 0 5 1 ) 0 . 2 0 0 ( 0 . 0 0 8 ) 0 . 6 0 0 ( 0 . 0 2 4 ) 1 . 8 0 0 ( 0 . 0 7 1 ) 2 . 0 0 0 ( 0 . 0 7 9 ) 0 . 7 0 0 ( 0 . 0 2 8 ) r e f t y p 1 . 4 5 0 ( 0 . 0 5 7 ) m a x
APR343 document number: ds 36884 rev . 4 - 2 11 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new product suggested pad layout (1) package t ype: sot25 dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e1 (mm)/(inch) e2 (mm)/(inch) value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 1.900/0.075 e 2 e 1 y x g z
APR343 document number: ds 36884 rev . 4 - 2 12 of 12 www.diodes.com december 2014 ? diodes incorporated APR343 a product line of diodes incorporated new 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. diod es incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, custo mers 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 una uthorized 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 tra demarks. 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 incorporated products are specifically not authorized for use as critical components in life support devices or systems without the expres s 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 result 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 effectiveness. 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 - related 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 incor porated. 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 ? 2014 , diodes inc orporated www.diodes.com

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