2012/08/29 ver.5 page 1 sp6003a synchronous rectifier driver description applications the fundamental of sp6003a synchronous rectifier (sr) driver ic is based on our u.s. patented methods that utilize the principle of prediction logic circuit. the ic deliberates previous cycle timing to control the sr in pres ent cycle by predictive algorithm that makes adjustments to the turn- off time, in order to achieve maximum efficiency and avoid cross- conduction at the same time. it also maintains the mosfets body diode conduction at minimum level. the sp6003a is cap able to adapt in almost all existing flyback converters with few adjustments considered necessary. servers & workstations storage area network power supplies telecommunication converters embedded systems industrial & commercial systems using high current processors features pin configuration (sop-8) part marking offers efficiency improvement over schottky diode (depends on drive configuration of the sr). drives all logic level power mosfet. prediction gate timing control. minimum mosfet body diode conduction. operating frequency up to 650 khz. synchronize to transformer secondary voltage waveform.
2012/08/29 ver.5 page 2 sp6003a synchronous rectifier driver typical applcation circuit pin description pin symbol description 1 timing discontinuous current filter timing adjust ment resistor connection. 2 pred capacitor to store previous cycle timing for catch mosfet 3 rapid-adj capacitor connection to adjust fast pul se width reduction response. 4 cramp ramp capacitor adjustment to extend mosfet s gate timing. 5 gnd ground connection. 6 mosg-c catch mosfet gate drive. 7 vdd dc supply voltage. 8 sync synchronized signal from transformers outpu t.
2012/08/29 ver.5 page 3 sp6003a synchronous rectifier driver block diagram ordering information part number package part marking sp6003as8rg sop-8 sp6003a i sp6003as8tg sop-8 sp6003a i SP6003AS8RGB sop-8 sp6003a i sp6003as8tgb sop-8 sp6003a i sp6003as8rg : 7 tape reel ; pb C free sp6003as8tg : tube ; pb C free SP6003AS8RGB : 7 tape reel ; pb C free ; halogen - free sp6003as8tgb : tube ; pb C free ; halogen Cfree absoulte maximum ratings (ta=25 , unless otherwise specified.) the following ratings designate persistent limits b eyond which damage to the device may occur . symbol parameter value unit v dd dc supply voltage 7 v sync sync voltage 7.5 v i out peak source current (pulsed) 1 a peak sink current (pulsed) 1.5 a p d power dissipation @ t a =85 (*) 0.25 w t j operating junction temperature range -40 to 150 t stg storage temperature range -40 to 150 t lead lead soldering temperature for 5 sec. 260
2012/08/29 ver.5 page 4 sp6003a synchronous rectifier driver thermal resistance symbol parameter value unit r ? jc thermal resistance junction C case (*) 45 /w (*) the power dissipation and thermal resistance ar e evaluated under copper board mounted with free ai r conditions. electrical characteristics (t a =25 , v dd =5v, v sync =5v, freq. =300 khz, duty cycle=50%, unless otherwi se specified.) symbol parameter conditions min. typ. max. unit supply input i dd supply current no load 4 5.5 8 ma vonth vdd turn on threshold 5.0 7.0 v voffth vdd turn off threshold 3.8 4.1 v sync reference (sync) vshth sync high threshold 3.9 5.0 v vslth sync low threshold 0.9 1.2 v mosfet gate driver (mosg-c) voh output high voltage io = -200ma 4.8 4.9 5.0 v vol output low voltage io = 200ma 0.0 0.1 0.2 v td propagation delay no load 15 20 25 ns tr rise time load = 1nf (*) 24 28 36 ns tf fall time load = 1nf (*) 20 23 30 ns (*) tr & tf are measured among 10% and 90% of start ing and final voltage.
2012/08/29 ver.5 page 5 sp6003a synchronous rectifier driver performance characteristics (t a =25 , unless otherwise specified.) figure 1: supply current vs supply voltage 0 1 2 3 4 5 6 7 8 9 10 3.3 3.5 3.7 4 4.2 4.4 4.6 4.9 5 5.3 5.5 5.7 6.1 v d d (v) i d d (m a) figure 4: supply current vs load capacitor 0 2 4 6 8 10 12 14 16 18 20 220 330 470 680 1000 1560 2200 2530 2880 c loa d (pf) i d d (m a) figure 2: output rise tim e vs load capacitor 0 10 20 30 40 50 60 70 220 330 470 680 1000 1330 1680 c lo ad (pf) tim e (ns) figure 5: supply current vs freq. @ no load 0 1 2 3 4 5 6 7 20 50 81 154 184 256 327 380 425 484 554 frequency (khz) i d d (m a) figure 3: output fall tim e vs load capacitor 0 10 20 30 40 50 60 70 220 330 470 680 1000 1330 1680 c lo a d (pf) tim e (ns) figure 6: supply current vs freq. @ load=1nf 0 2 4 6 8 10 12 14 16 18 20 30 50 70 93 119 128 149 170 176 frequency (khz) i d d (m a) *fig. 2-4: frequency = 85 khz.
2012/08/29 ver.5 page 6 sp6003a synchronous rectifier driver sop- 8 package outline
2012/08/29 ver.5 page 7 sp6003a synchronous rectifier driver information provided is alleged to be exact and con sistent. sync power corporation presumes no respon sibility for the penalties of use of such information or for any vio lation of patents or other rights of third parties, which may result from its use. no license is granted by allegation or otherwise un der any patent or patent rights of sync power corpo ration. conditions mentioned in this publication are subject to change without notice. this publication surpasses and re places all information previously supplied. sync power corporation produc ts are not authorized for use as critical component s in life support devices or systems without express written approval of sync power corporation. ?the sync power logo is a registered trademark of sy nc power corporation ?2004 sync power corporation C printed in taiwan C al l rights reserved sync power corporation 7f-2, no.3-1, park street nankang district (nksp), taipei, taiwan, 115, r.o.c phone: 886-2-2655-8178 fax: 886-2-2655-8468 http://www.syncpower.com
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