sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?1?of?10 current?mode?pwm+pfm?controller?with?built-in?high?voltage mosfet dip-8-300-2.54 description sd686x? is? current? mode? pwm+pfm? controller? with? built-in? high- voltage?mosfet?used?for?swps, with?low?standby?power?and?low start? current? for? power? switch.? in? standby? mode,? the? ci rcuit? enters burst? mode? to? reduce? the? standby? power? dissipation. the? switch frequency?is?25~67khz?with?jitter?frequency?for?low?emi. built-in? peak? current? compensation? circuit makes? the? limit? output power? stable? even? with? different? input? ac? voltage.? limit ? output power?can?be?adjusted?through?the?resistor.?ma ximum?peak?current compensation?during?power-on?reduces ?pressure?on?transformer? to avoid? saturation,? the? peak? current? compensation? will? decrease? for balance?after?power-on. it? integrates various? protections? such? as? undervoltage? lockout, overvoltage? protection,? overload? protection,? lead? edge? blanking, primary?winding?overcurrent?protection?and?thermal?shutdown.?the circuit?will?restart?until?normal?if?protection?occurs. features *??energy?star?2.0?standard *??lower?start-up?current?(3 m a) *??various?switching?frequency?following?load?for?the?higher efficiency *??frequency?jitter?for?low?emi *?overvoltage,?overcurrent,?overload?and?over?temperature protections. *??adjustable?limit?output?power *??undervoltage?lockout *??built-in?high?voltage?mosfet *??auto?restart?mode *??peak?current?compensation *??maximum?peak?current?compensation?for?initialization *??burst?mode *??cycle?by?cycle?current?limit applications *?swps
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?2?of?10 ordering?information part?no. package marking material package?type sd6860 sd6860 pb?free tube sd6861 sd6861 pb?free tube sd6862 sd6862 pb?free tube SD6863 SD6863 pb?free tube sd6864 dip-8-300-2.54 sd6864 pb?free tube typical?ouput?power?capability 190~265v 85~265v part?no. adapter open adapter open sd6860p65k67 7w 9w 5w 7.2w sd6861p65k67 10w 14w 8w 12w sd6862p65k67 12w 17w 10w 14w SD6863p65k67 14w 19w 12w 15w sd6864p65k67 16w 21w 14w 18w block?diagram s r q fb dr comp 7.6v 14 .8v v cc + - + - gnd fb adj reduced frequency control osc frequency jitter internal bias level?shift over?voltage,?over current,?over?load?and over?temperature protections burst?mode control leading edge blanking control driver peak?current compensation limit?output power?adjust
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?3?of?10 absolute?maximum?rating characteristics symbol rating unit drain-gate?voltage?(r gs =1m w ) v dgr 650 v gate-source?(gnd)?voltage v gs 30 v sd6860 4 sd6861 6 sd6862 8 SD6863 11 drain?current?pulse note1 sd6864 i dm 14 a sd6860 1 sd6861 1.5 sd6862 2 SD6863 3 continuous?drain current (tamb=25 c) sd6864 i d 4 a sd6860 15 sd6861 30 sd6862 68 SD6863 140 signal?pulse avalanche energy note2 sd6864 eas 200 mj power?supply?voltage v cc ,max 28 v feedback?input?voltage v fb -0.3~8 v limit?output?power?voltage v adj -0.3~8 v p d 1.5 w total?power?dissipation d arting 0.017 w/ c operating?junction?temperature t j +170 c operating?temperature t amb -25~+85 c storage?temperature t stg -55~+150 c note:?1.?pulse?width?is?limited?by?maximum?junction?temperature; 2.?l=51mh,?t j =25 c(start) electrical?characteristics ?(for?mosfet,?unless?otherwise?specified,?t amb =25 c) characteristics symbol test?conditions min. typ. max. unit drain-source?breakdown?voltage bv dss ?v gs =0v,?i d =50 m a 650 -- -- v v ds =650v,?v gs =0v -- -- 50 m a zero?gate?voltage?drain?current i dss v ds =480v,?v gs =0v tamb=125 c -- -- 200 m a sd6860 -- 14.0? 16.8 sd6861 -- 8.0 9.6 sd6862 -- 5.0 6.0 SD6863 -- 4.0 4.8 static?drain-source on?resistance sd6864 r ds(on) v gs =10v,?i d =0.5a -- 3.0 3.6 w
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?4?of?10 characteristics symbol test?conditions min. typ. max. unit sd6860 -- 210 -- sd6861 -- 250 -- sd6862 -- 550 -- SD6863 -- 640 -- input?capacitance sd6864 c iss ?v gs =0v,?v ds =25v,?f=1mhz -- 840 -- pf sd6860 -- 18 -- sd6861 -- 25 -- sd6862 -- 38 -- SD6863 -- 40 -- output?capacitance sd6864 c oss ?v gs =0v,?v ds =25v,?f=1mhz -- 44 -- pf sd6860 -- 8 -- sd6861 -- 10 -- sd6862 -- 17 -- SD6863 -- 30 -- reverse?transfer capacitance sd6864 c rss ?v gs =0v,?v ds =25v,?f=1mhz -- 40 -- pf sd6860 -- 10 -- sd6861 -- 12 -- sd6862 -- 20 -- SD6863 -- 33 -- turn?on?delay?time sd6864 t d(on) ?v dd =0.5bv dss ,?i d =25ma -- 40 -- ns sd6860 -- 3 -- sd6861 -- 4 -- sd6862 -- 15 -- SD6863 -- 19 -- rise?time sd6864 tr v dd =0.5bv dss ,?i d =25ma -- 25 -- ns sd6860 -- 27 -- sd6861 -- 30 -- sd6862 -- 55 -- SD6863 -- 70 -- turn?off?delay?time sd6864 t d(off) ?v dd =0.5bv dss ,?i d =25ma -- 90 -- ns sd6860 -- 8 -- sd6861 -- 10 -- sd6862 -- 25 -- SD6863 -- 32 -- fall?time sd6864 tf v dd =0.5bv dss ,?i d =25ma -- 42 -- ns electrical?characteristics ?(unless?otherwise?specified,?v cc =12v,?t amb =25 c) characteristics symbol test?conditions min. typ. max. unit undervoltage?section start?threshold?voltage v start 14 14.8 16 v stop?threshold?voltage v stop 6.6 7.6 8.6 v
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?5?of?10 characteristics symbol test?conditions min. typ. max. unit oscillator?section max.?oscillate?frequency f oscmax v fb =3v 61 67 73 khz min.?oscillate?frequency f oscmin v burl SD6863 1.10 1.20 1.30 peak?current?limit sd6864 i over ? max.?inductor?current 1.35 1.50 1.65 a burst?mode burst?mode?high?voltage v burh ? fb?voltage 0.40 0.50 0.60 v burst?mode?low?voltage v burl ? fb?voltage 0.25 0.35 0.45 v protection?section overvoltage?protection v ovp ?v cc voltage 22 24 26 v over?temperature?protection t otp 125 160 -- c quit?over?temperature?protection t otu 80 100 120 c leading-edge?blanking?time t leb 350 650 -- ns total?standby?current start?current i start ?v cc increases?from?0v?to?12v -- 3 10 m a quiescent?current i static ?v fb =0v 1.0 1.9 3.0 ma sd6860 1.0 2.0 3.0 ma sd6861 1.0 2.0 3.0 ma sd6862 1.2 2.2 3.2 ma SD6863 1.2 2.2 3.2 ma operating?current sd6864 i op v fb =3v 1.4 2.4 3.4 ma
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?6?of?10 pin?configuration pin?description pin?no. pin?name i/o function?description 1 gnd i ground 2 adj i adj?pin 3 v cc i power?supply?pin 4 fb i/o feedback?input?pin 5 nc - nc 6,?7,?8 dr o drain?pins. function?description sd686x? is? designed? for? off-line? smps,? consisting? of? high? voltage? mosfet,? optimized? gate? driver? and? current mode? pwm+pfm? controller? which? includes? frequency? oscillator? and? various? protections? such? as? undervoltage lockout,? overvoltage? protection? and? overload? protection.? frequency? jitter? generated? from? oscillator? is? used? to lower?emi.?burst?mode?is?adopted?during?light?load?to?lower?standby?power?dissipation,?and?function?of?lead?edge blanking?eliminates?the?mosfet?error?shutdown?caused?by?interference?through?minimizing?mosfet?turning?on time.??peak?current?compensation?reduces?the?pressure?on?transformer?during?circuit?starts?and?output?power?limit can? be?adjusted?by? resistor?through? adj? pin.? few? peripheral?components? are? needed? for? higher? efficiency? and higher?reliability?and?it?is?suitable?for?flyback?converter?and?forward?converter. 1. under?voltage?lockout?and?self-start at? the? beginning,? the? capacitor? connected? to? pin? v cc ? is? charged? via? start? resistor? by? high? voltage? ac? and? the circuit?starts?to?work?if?voltage?at? v cc ?is?14.8v.? the?output?and?fb?source?current? are?shutdown?if?there?is?any protection? during? normal? operation? and? v cc ? is? decreased? because? of? powering? of? auxiliary? winding.? ? the? whole control? circuit? is? shutdown? if? voltage? at? v cc ? is? 7.6v? below? to? lower? current? dissipation? and? the? capacitor? is recharged?for?restarting.
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?7?of?10 2. frequency?jitter?and?reduced?frequency?mode the?oscillation?frequency?is?kept?changed?for?low?emi?and?decreasing?radiation?on?one?frequency.?the?oscillation frequency?changes?within?a?very?small?range?to?simplify?emi?design.?the?rule?of?frequency?changing?(frequency center?is?67khz):?2.5khz?change?in?4ms,?64?frequency?points?in?all. for?high?efficiency,?frequency?is?changed?according?to?current?output?from?fb?pin.?when?fb?current?is?above?a certain? value?(different? with? different?version)? without? limit? output? power? adjust,? frequency? decrease? from? 67khz to?typ.?25khz. 3. peak?current?compensation?and?normalization generally,? limit? output? power? changes? with? different? inputs.? limit? output? power? is? hold? in? this? circuit? because? of peak?current?compensation.?larger?peak?current?compensation?for?higher?input?ac?voltage,?it?decreases?to?zero with?light?load?and?no?peak?current?compensation?in?burse?mode. maximum?peak?current?compensation?during?power-on?reduces?pressure?on?transformer?to?avoid?saturation,?the peak?current?compensation?will?decrease?for?balance?after?power-on.?the?duration?is?decided?by?the?load. 4. limit?output?power?adjust limit?output?power?is?adjusted?by?varying?fb?current?through?resistor?radj?adjust.?when?radj=0,?no?change?in limit?output?power;?when?radj?exceeds?typ.?20k ,?limit?output?power?begins?to?be?reduced. 5. burst?mode working? in? this? mode? to? reduce? power? dissipation.? it? works? normally? when? fb? is? 0.5v? above,? and? during 0.35v sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?8?of?10 fb?voltage?is?0.5v?below?with?light?load.?this?is?repeated?to?decrease?action?of?switch?for?lower?power?dissipation. 6. leading?edge?blanking for?this?current-controlled?circuit,?there?is?pulse?peak?current?during?the?transient?of?switch?turning?on?and?there?is an?error?operation?if? the?current?is?sampled?during?this? time.?and?leading?edge?blanking?is?adopted?to? eliminate this? error? operation.? the? output? of? pwm? comparator? is? used? for? controlling? shutdown? after? the? leading? edge blanking?if?there?is?any?output?drive. 7. over?voltage?protection the? output? is? shutdown? if? voltage? at? vcc? exceeds? the? threshold? value? and? this? state? is? kept? until? the? circuit? is powered?on?reset. 8. overload?protection fb? voltage? increases? if? there? is? overload? and? the? output? is? shutdown? when? fb? voltage? is? up? to? the? feedback shutdown?voltage.?this?state?is?kept?until?the?circuit?is?powered?on?reset. 9. cycle?by?cycle?peak?current?limit during?each?cycle,?the?peak?current?value?is?decided?by?the?comparison?value?of?the?comparator,?which?will?not exceed? the? peak? current? limited? value? to? guarantee? the? current? on? mosfet? will? not? be? larger? than? the? rating current.?the?output?power?will?not?increase?if?the?current?reaches?the?peak?value?to?limit?the?max.?output?power. the?output?voltage?decreases?and?fb?voltage?increases?if?there?is?overload?and?corresponding?protection?occurs. 10. primary?winding?over?current?protection if? secondary? diode? is? short,? or? the? transformer? is? short,? this? protection? will? occur.? at? this? time,? once? it? is? over current?in?spite?of?the?leading?edge?blanking?(l.e.b)?time,?protection?will?begin?after?350ns,?and?is?active?for?every
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?9?of?10 cycle.?when? the? voltage? on? the? current? sense? resistor? is? 1.7v,? this? protection? will? occur? and?the? output?is?shut down.?this?state?is?kept?until?the?under?voltage?occurs,?and?the?circuit?will?start. 11. thermal?shutdown if?the?circuit?is?over?temperature,?the?over?temperature?protection?will?shut?down?the?output?to?prevent?the?circuit from?damage.?this?state?is?kept?until?it?quit?the?temperature?protection,?and?the?circuit?will?start. typical?application?circuit note: the? circuit? and? parameters? are? for? reference? only,? please? set? the? parameters? of the? real? application? circuit based?on?the?real?test.
sd686x hangzhou?silan?microelectronics?co.,ltd rev:1.0???????????????2010.03.12 http://www.silan.com.cn ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?10?of?10 package?outline dip-8-300-2.54?????????????????????????????????????????????????????????????????????????????????????????????????????unit:?mm mos?devices?operate?notes: electrostatic?charges?may?exist?in?many?things.?please?take?following?preventive?measures?to?prevent?effectively the?mos?electric?circuit?as?a?result?of?the?damage?which?is?caused?by?discharge: l ? the?operator?must?put?on?wrist?strap?which?should?be?earthed?to?against?electrostatic. l ? equipment?cases?should?be?earthed. ? l ? all?tools?used?during?assembly,?including?soldering?tools?and?solder?baths,?must?be?earthed. l ? mos?devices?should?be?packed?in?antistatic/conductive?containers?for?transportation. disclaimer?: silan?reserves?the?right?to?make?changes?to?the?information?herein? for?the?improvement?of?the?design? and?performance without? further? notice!? customers? should? obtain? the? latest? relevant? information? before? placing? orders? and? should? verify that?such?information?is?complete?and?current. all?semiconductor?products?malfunction?or?fail?with?some?probability?under?special?conditions.?when?using?silan?products in? system? design? or? complete? machine? manufacturing,? it? is? the? responsibility? of? the? buyer? to? comply? with? the? safety standards?strictly?and?take?essential?measures?to?avoid?situations?in?which?a?malfunction?or?failure?of?such?silan?products could?cause?loss?of?body?injury?or?damage?to?property. silan?will?supply?the?best?possible?product?for?customers!
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