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2008 / 08/10 ver.1 page 1 sp 6853 green - mode pwm controller description applications the sp6853 is a low cost , low startup current , current mode pwm controller with green - mode power - saving operation. the integrated functions include the leading - edge blanking of the current sensing, internal slope compensation. it would provide the users a superior ac/dc power application of higher efficiency, low external component counts, and lower cost solution for applications. t he sp6853 features more protections or functions for the following characteristics : add olp (over load protection) function to provide better protection performance for fault conditions like short circuit or over load. modify the ovp (over voltage protection) mechanism from the cycle - by - cycle mode to the hiccup mode. sp6853 is available by s ot - 2 3 - 6l / dip - 8p packages. ? ac/dc s witching power adaptor ? battery c harger ? pc 5v standby power. ? open - f rame s witching p ower s upply features pin configuration ? high - voltage bi cmos process ? very low startup current ( <20 a) ? under voltage lockout (uvlo ) ? current mode control ? non - audible - noise green mode control ? current limiting ? leb (leading - edge blanking) on cs pin ? olp (over load protection) ? ovp (over voltage protection) on vcc pin ? leading - edge blanking ? programmable switching frequency ? internal slope compensation ? green - mode control for power saving ? 300ma driving capability ? so t - 23 - 6l dip - 8p part marking so t - 23 - 6l dip - 8p
2008 / 08/10 ver.1 page 2 sp 6853 green - mode pwm controller typical applcation circuit typical applcation circuit ( h igh efficiency smps + synchronous rectifier )
2008 / 08/10 ver.1 page 3 sp 6853 green - mode pwm controller pin description sp6853 d 8tg pin symbol description 1 out gate driver output to drive the external mosfet 2 vcc s upply voltage in 3 nc unconnected pin 4 cs current se nse . this pin senses the voltage across a resistor , to control pwm output. this pin also provides current amplitude information for current - mode control. 5 rt this current is used to charge an internal capacitor, to determine the switching f requency. 6 n c unconnected pin 7 comp voltage feedback. the pin provides the output voltage regulation signal. , it provides f eedback to the internal pwm comparator, so that the pwm comparator can control the duty cycle. 8 gnd ground sp6853 s 26 rg pin symbol descriptio n 1 gnd ground 2 comp voltage feedback. the pin provides the output voltage regulation signal. , it provides f eedback to the internal pwm comparator, so that the pwm comparator can control the duty cycle 3 rt this current is used to charge an internal ca pacitor, to determine the switching f requency. 4 cs current sense . this pin senses the voltage across a resistor , to control pwm output. this pin also provides current amplitude information for current - mode control 5 vcc supply voltage in 6 out gate dri ver output to drive the external mosfet block diagram
2008 / 08/10 ver.1 page 4 sp 6853 green - mode pwm controller ordering information part number package part marking sp6853 d 8tg b di p - 8 p sp6853 i sp6853 s26rg b sot - 23 - 6l 85 3 yw sp6853 d 8tg b : tube ; pb C free ; halogen - free sp6853 s 26 rg b : tape reel ; pb C fr ee ; halogen - free absoulte maximum ratings (t a =25 , unless otherwise specified.) the following ratings designate persistent limits beyond which damage to the device may occur . symbol parameter value unit v cc dc supply voltage 3 6 v v c omp / rt / cs comp / rt / cs voltage - 0. 3 ~ 7 .0 v p d power dissipation @ t a =85 (*) 0. 3 w esd human body model 4 kv machine model 300 v t ope operating ambient temperature - 40 ~ 85 t j operating junction temperature range - 40 ~ 150 t stg storage temperature range - 40 ~ 150 t lead pb - free lead soldering temperature for 5 sec. 260 r ? jc thermal resistance junction C case (*) sot - 23 - 6l 210 /w dip - 8p 95 (*) the power dissipation and thermal resistance are evaluated under copper board mounted with free air con ditions.
2008 / 08/10 ver.1 page 5 sp 6853 green - mode pwm controller electrical characteristics (t a =25 , v cc = 15 v, unless otherwise specified.) symbol parameter conditions min. typ. max. unit s upply voltage ( vcc pin ) i stt s tartup c urrent 10 20 u a i op operating c urrent v comp = 0 v 2 .7 4 m a v comp = 3 v 2.4 m a protection tripped (olp, ovp) 1.0 m a uvlo (off) min. operating voltage 9.0 10.0 11.0 v uvlo (on ) start threshold voltage 15.0 16.0 17.0 v ovp level over voltage protection 24 26 29.5 v voltage feedback ( comp pi n ) isc short circuit current 1.25 2.2 m a vop open loop voltage 6 v v th(gm) green mode threshold vcomp 2.35 v oscillator ( rt pin ) f osc frequency r t =100k ? 60.0 6 8 .0 7 5 .0 khz f osc ( gm ) green mode frequency fs=65.0khz 2 2 khz fdt frequency variation versus temp. deviation ( - 40 c ~105 c) 3 % fdv frequency variation versus v cc deviation (v cc =11v - 25v) 1 % current sensing ( cs pin ) vcs(off) maximum inp ut voltage 0.8 0.85 0.9 v t led d leading edge blanking time 280 ns zcs input impedance 1 m t pd delay to output 100 ns gate driver output ( out pin ) dc (m ax ) maximum duty cycle 70 75 80 % dc (m in) minimum duty cycle 0 % v ol output low level v cc =15v, io=20ma 1 v v oh output high level v cc =15v, io=20ma 8 v tr rising time load cap=1000pf 50 200 ns tf falling time load cap=1000pf 30 120 ns olp ( o ver load protection ) tl olp olp trip level 5.0 v td olp olp delay time (note) 6 0 ms note: the olp delay time is proportional to the period of switching cycle. so that, the lower rt value will set the higher switching frequency and the shorter olp delay time.
2008 / 08/10 ver.1 page 6 sp 6853 green - mode pwm controller performance characteristics (t a =25 , unless otherwise specified.)
2008 / 08/10 ver.1 page 7 sp 6853 green - mode pwm controller performance characteristics (t a =25 , unless otherwise specified.)
2008 / 08/10 ver.1 page 8 sp 6853 green - mode pwm controller performance characteristics (t a =25 , unless otherwise specified.) max duty cycle min duty cycle max duty cycle min duty cycle max duty cycle min duty cycle
2008 / 08/10 ver.1 page 9 sp 6853 green - mode pwm controller performance characteristics (t a =25 , unless otherwise specified.) rising time load falling time load rising time load falling time load rising time load falling t ime load
2008 / 08/10 ver.1 page 10 sp 6853 green - mode pwm controller performance characteristics (t a =25 , unless otherwise specified.) leading edge blanking time olp delay time leading edge blanking time olp delay time leading edge blanking time olp delay time
2008 / 08/10 ver.1 page 11 sp 6853 green - mode pwm controller di p - 8 p package outline
2008 / 08/10 ver.1 page 12 sp 6853 green - mode pwm controller sot - 23 - 6 l package outline
2008 / 08/10 ver.1 page 13 sp 6853 green - mode pwm controller information provided is alleged to be exact and consistent. sync power corporation presumes no responsibility for the pe nalties of use of such information or for any violation of patents or other rights of third parties that may result from its use. no license is granted by allegation or otherwise under any patent or patent rights of sync power corporation. conditions men tioned in this publication are subject to change without notice. this publication surpasses and replaces all information previously supplied. sync power corporation products are not authorized for use as critical components in life support devices or sys tems without express written approval of sync power corporation. ? the sync power logo is a registered trademark of sync power corporation ? 2004 sync power corporation C printed in taiwan C all rights reserved sync power corporation 7 f - 2 , no.3 - 1 , park stre et 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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