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2012/08/09 v1 page 1 SP6852 green-mode power switch description applications the SP6852 is a low cost, low startup current, curr ent mode pwm controller with green-mode power-saving operation. built-in 700v mosfet provides simple design for adapter. 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. the SP6852 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. SP6852 is available in dip-8p package. ac/dc switching power adaptor battery charger pc 5v standby power. open-frame switching power supply features pin configuration dip-8p part marking dip-8p high-voltage bicmos process very low startup current (<20a) under voltage lockout (uvlo ) current mode control non-audible-noise green mode control current limiting 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 building in 650v mosfet
2012/08/09 v1 page 2 SP6852 green-mode power switch typical applcation circuit typical applcation circuit for high efficiency smps
2012/08/09 v1 page 3 SP6852 green-mode power switch pin description pin symbol description 1 source power mosfet source 2 cs current sense. this pin senses the voltage across a resistor, to control pwm output. this pin also provides current amplitude information for cur rent-mode control. 3 gnd ground 4 rt this current is used to charge an internal cap acitor, to determine the switching frequency. 5 comp voltage feedback. the pin provides the output volta ge regulation signal, it provides feedback to the internal pwm comparator, so that the pwm com parator can control the duty cycle. 6 vcc supply voltage in 7 drain power mosfet drain 8 drain power mosfet drain block diagram
2012/08/09 v1 page 4 SP6852 green-mode power switch ordering information part number package part marking SP6852d8tg dip-8p SP6852i SP6852d8tg : tube ; pb C free absoulte maximum ratings (t a =25 , unless otherwise specified.) the following ratings designate persistent limits b eyond which damage to the device may occur . symbol parameter value unit v cc dc supply voltage 36 v v comp / rt / cs comp / rt / cs voltage -0.3 ~ 7.0 v v ds mosfet breakdown voltage 700 v p d power dissipation @ t a =85 (*) 0.3 w human body model 4 kv esd machine model 300 v eas single pulse avalanche energy 49 mj t ope operating ambient temperature -40 ~ 85 t j operating junction temperature range -40 ~ 150 t stg storage temperature range -40 ~ 150 r ? jc thermal resistance junction C case (*) 95 /w (*) the power dissipation and thermal resistance ar e evaluated under copper board mounted with free ai r conditions.
2012/08/09 v1 page 5 SP6852 green-mode power switch electrical characteristics (t a =25 , v cc =15v, unless otherwise specified.) symbol parameter conditions min. typ. max. unit supply voltage ( vcc pin ) i stt startup current 10 20 ua v comp = 0v 2.7 4 ma v comp = 3v 2.4 ma i op operating current protection tripped (olp, ovp) 1.0 ma 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 26 27 29.5 v voltage feedback ( comp pin ) isc short circuit current 1.25 2.2 ma 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 68.0 70.0 khz f osc(gm) green mode frequency fs=65.0khz 22 khz fdt frequency variation versus temp. deviation (-40c ~105c) 3 % fdv frequency variation versus v cc deviation (v cc =11v-22v) 1 % current sensing ( cs pin ) vcs(off) maximum input voltage 0.8 0.85 0.9 v t ledd leading edge blanking time 280 ns zcs input impedance 1 m t pd delay to output 100 ns mosfet dc (max) maximum duty cycle 70 75 80 % dc (min) minimum duty cycle 0 % v dss drain-source breakdown voltage v gs =0v, i d= 250ua 700 v i dss drain-source leakage current v gs =0v, v ds= 600v 10 ua r ds(on) on-state resistance v gs =10v, i d= 0.6a 8 v sd forward on voltage v gs =0v, i s =1.4a 1.5 v co output capacitance v gs =0v, v ds =25v, f=1.0mhz 27 pf tr rising time 50 200 ns tf falling time 30 120 ns olp ( over load protection ) tl olp olp trip level 5.0 v td olp olp delay time (note) 60 ms note: the olp delay time is proportional to the per iod of switching cycle. so that, the lower rt value will set the higher switching frequency and the shorter olp delay time.
2012/08/09 v1 page 6 SP6852 green-mode power switch performance characteristics (t a =25 , unless otherwise specified.)
2012/08/09 v1 page 7 SP6852 green-mode power switch performance characteristics (t a =25 , unless otherwise specified.)
2012/08/09 v1 page 8 SP6852 green-mode power switch 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
2012/08/09 v1 page 9 SP6852 green-mode power switch performance characteristics (t a =25 , unless otherwise specified.) rising time load falling time load rising time load falling time load rising time load falling time load
2012/08/09 v1 page 10 SP6852 green-mode power switch 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
2012/08/09 v1 page 11 SP6852 green-mode power switch dip- 8p package outline
2012/08/09 v1 page 12 SP6852 green-mode power switch 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 that 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 s ync power corporation ?2004 sync power corporation C printed in taiwan C all 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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