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cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 1 general description features cm6901 is a sls, src/llc + sr resonant controller and it can operate at bot h src and llc region with synchronous rectification to achieve high efficiency. its unique features: fm + 2 pwming modes. it is used for dc-dc conversion in offline application. light load regulation is accomplished by transitioning the controller from frequency modulation mode into pwm mode. to have the optimal balance performance between hold-up time and efficiency, its frequency range crosses fr1(resonant frequency). cm6901 system has a const ant voltage feedback loop with precision 2.5v vfb reference. the 1v ilimit can be latched when a standby converter is applied; otherwise, it is an auto-restart i limit. ? 90+ controller ? smaller and thinner transformer ? 20ms with reasonable bulk cap(hold up time) ? sls, src/llc + sr resonant controller ? supply voltage range : 10v to 20v. ? 2 gate drivers: typical peak drive from 12v supply : (pmos~200 ohm and nmos~100 ohm). ? uvlo =11v with 1v hystetesis. ? reference ok comparator. ? fm + 2 pwming mode operation ? light load pwming (light load regulation) ? sr ideal diode pwming(cross resonant frequency application ) ? gm feao, fm modulation error amplifier ? gm deao, pwm error amplifier ? close loop soft start capability with shutdown function. ? auto-restart duri ng current limit . ? precision 2.5v vfb threshold for constant voltage feedback loop. ? precision 1v i limit threshold. ? patented applications cm6901 pin configuration ? dc-dc power supply.
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 2 ordering information part number temperature range package cm6901xis* -40 to 125 16-pin sop (s16) cm6901xistr* -40 to 125 16-pin sop (s16) cm6901xip* -40 to 125 16-pin pdip (p16) *note : x : suffix for halogen free and pb free product tr : package is typing reel block diagram css 7 shdn - + . 2.5v 1v d in+ 5 vfb 2 pridrvb 13 vcc 15 1.25v srdrv 12 ilim + - . rtct 9 osc 7.5ua deao 6 1.5v v tol rset 1 clk - + . - 1v srdrvb 11 vcc + - . d in- 4 pridrv 14 + - . - + . logic ilim 8 vref 16 uvlo/ref gnd 10 feao 3
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 3 pin description operating voltage pin no. symbol description min. typ. max. unit 1 rset external resistor which convert f eao voltage signal into current signal for frequency modulation. sr is pwming control , when rset lower than 1.5v. 0 5.5 v 2 vfb non-inverting input into resonant error amplifier . 0 2.5 3 v 3 feao resonant error amplifier output and compensation node for frequency modulation control. 0 5.5 v 4 d_in- inverting input into pwm error amplifier. 0 6 v 5 d_in+ non-inverting input into pwm error amplifier. 0 6 v 6 deao pwm error amplifier output and compensation node for pwm control. 0 4.5 v 7 css soft start for fm/pwm operation with 1v enable threshold. also, use for auto-restart operation during current limit. 0 5.5 v 8 ilim input to current comparator with 1v threshold. 0 1 1.25 v 9 rtct oscillator timing components which set the minimum frequency. 1.2 3 v 10 gnd ground 11 sdrvb synchronous mosfet driver output. -0.3 vcc v 12 sdrv synchronous mosfet driver output. -0.3 vcc v 13 pridrvb primary side mosfet driver output. -0.3 vcc v 14 pridrv primary side mosfet driver output. -0.3 vcc v 15 vcc positive supply for the ic 10 15 20 v 16 vref buffered output for the 7.5v voltage reference 7.5 v
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 4 absoulte maximum ratings (ta=25 , unless otherwise specified.) the following ratings designate persistent limits beyond which damage to the device may occur . symbol parameter value unit vcc dc supply voltage -0.3 to 20 v srdrv srdrv voltage -0.3 to vcc+0.3 v srdrvb srdrvb voltage -0.3 to vcc+0.3 v pridrv pridrv voltage -0.3 to vcc+0.3 v pridrvb pridrvb voltage -0.3 to vcc+0.3 v vref vref voltage 7.8 v rtct rtct voltage -0.3 to vref+0.3 v vilim vilim voltage -0.3 to vref+0.3 v css css voltage -0.3 to vref+0.3 v deao pwm error amplifier output voltage -0.3 to vref+0.3 v d_in+ non-inverting input into pwm erro r amplifier voltage -0.3 to vref+0.3 v feao resonant error amplifier ou tput voltage -0.3 to vref+0.3 v vfb non-inverting input into resonant erro r amplifier voltage -0.3 to vref+0.3 v rset v to i voltage -0.3 to vref+0.3 v
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 5 electrical characteristics (vcc=12v, rt=40.2k1%, ct=1470pf1%, freq. = 50 khz, duty cycle=48% , temp= -40 ~ 125 , unless otherwise specified.) parameter symbol conditions min. typ. max. unit vref (pin 16) vref ta=25 ; iref=1ma 7.41 7.5 7.59 v reference voltage vref ta=-40 ; iref=0ma 7.44 7.53 7.62 v vref ta=125 ; iref=0ma 7.53 7.67 7.7 v line regulation 11.5v < vcc < 16.5v 10 25 mv load regulation 0ma < iref < 5ma, ta=25 0 10 25 mv vcc (pin 15) vcc start up voltage vs tart 10.5 10.8 11.1 v vcc turn off voltage 9.5 10 10.5 v vcc start up current ta=25 63.5 78.25 93 ua uvlo hysteresics hys 0.95 1 1.05 v operating current icc ta=25 1 ma srdrvb , srdrv , pridrvb , pridrv (pin 11,12,13,14) output low voltage vol isrdrv=-6ma 0.6 1.2 v output high voltage voh isrdrv=+6ma 9.6 10.8 v iout peak source curr ent iout 0.12 a iout peak sink current iout 0.12 a pmos rdson rout ta=25 200 250 ohm nmos rdson rout ta=25 100 150 ohm dead time between pridrv and pridrvb tdead ta=25 1 us rising edge delay between pridrv and srdrv tdelay ta=25 164 205 246 ns falling edge delay between srdrv and pridrv tdelay ta=25 168 210 252 ns rise time on all channels cl=100pf 65 ns fall time on all channels cl=100pf 30 ns duty cycle range 0 50 % ilim (pin 8) threshold voltage vth ta=25 1.45 1.65 1.75 v ss voltage hi ta=25 0.95 1 1.05 v ss voltage low ta=25 1.31 1.64 1.97 v
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 6 electrical characteristics (vcc=12v, rt=40.2k1%, ct=1470pf1%, freq. = 50 khz, duty cycle=48% , temp=-40 ~ 125 , unless otherwise specified.) parameter symbol conditions min. typ. max. unit css (pin 7) soft start current iss ta=25 6.3 7.5 8.8 ua enable voltage ven ta=25 0.9 1.0 1.1 v enable hysteresis vhys ta=25 100 mv auto-restart upper threshold vup 4.85 5.0 5.15 v auto-restart lower threshold vlw 1-vhyst v feao resonant error amplifier (pin 3) input voltage range 6 v transconductance gm vfb50mv, ta=25 37 49.5 62 umho vfb (pin2) ta=25 2.48 2.5 2.52 v feedback reference voltage ( note 2) ta=125 2.49 2.51 2.53 v ta=-40 2.47 2.49 2.51 v input bias current -1 -0.5 ua output high voltage 5.5+vbe v output low voltage 0.1 0.4 v sink current vfb =250mv , ta=25 -21.5 -17.55 -13.6 ua source current vfb = -250mv , ta=25 12.4 16.7 21 ua open loop gain 60 db deao pwm error amplifier (pin 6) input voltage range 6 v reference voltage 0.96 1.01 1.06 v transconductance gm ta=25 95 125 155 umho input bias current -1.0 -0.5 ua output voltage high 3+vbe v output voltage low 0.1 0.4 v sink current -5 ua source current 7 ua open loop gain 60 db
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 7 electrical characteristics (vcc=12v, rt=40.2k1%, ct=1470pf1%, freq. = 50 khz, duty cycle=48% , temp=-40 ~ 125 , unless otherwise specified.) parameter symbol conditions min. typ. max. unit rtct oscillator ; rt=40.2k1%;ct=1470pf1%, (pin 9) initial accuracy ta=25 45 50 55 khz voltage stability 11.5v < vcc < 16.5v 1 % temperature stability 2 % ramp valley to peak voltage 2 v ct discharge time 350 ns maximum duty cycle deao > 3.0v 48 % minimum duty cycle deao < 1.2v 0 % sr ideal diode ; rset1=30.1k1% ; rset2=215k1% (pin12) maximum duty cycle ta=25 , feao=2.2v 37.4 44 50.6 % middle duty cycle ta=25 , feao=1.57v 28.4 30.2 32 % minimum duty cycle ta=25 , feao=0v 26.37 29.3 32.23 % frequency at minimum duty cycle ta=25 22.14 24.6 27.06 khz
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 8 timing diagram dead time pridrv falling edge delay time rising edge delay time pridrvb oscillator the oscillator frequency is determined by the values of rt and ct. f osc = 1 / (t ramp + t deadtime ) t ramp = rt * ct * ln((v ref + ichg*rt -1.25)/(v ref + ichg*rt -3)) where i chg = 4*(f eao -v be )/r set resonant section fm modulator frequency modulation of the resonant controller section is accomplished by controlling the charging current of the oscillator through resonant error amplifier. the frequency of the resonant section is ? of the oscillator frequency. compensation is accomplished by connecting r and c in series to the feao pin. i chg = 4*(f eao -v be )/r set i chg(max) = 20v/r set
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 9 osc rset1 rset v tol ct - + . rt rest2 2.5v vref feao vref vfb 2 pwmings: sr ideal diode pwming (synchronous outputs) sr ideal diode pwming for synchronous drivers is accomplished by comparing the voltage signal at the rset pin to rtct ramp. the pulse-width reduction happens when t he voltage at the rset is lower than 1.5v. this allows safe operation of the power converter with synchronous rectification when the switching frequency is below the highest resonant point frequency fr1. 3v rset1 + - . srdrv vout rt - + . feao to logic v tol vref osc rf1 pridrv vref rest2 vfb rf3 ct 1.25v 2.5v rset decreasing pulsewidth with v(rset)<1.5v 1.5v
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 10 light load pwming in a typical application, low gain c onfiguration accomplished by connecting r deao 1 and r deao 2 in the closed loop configuration . the gain for the pwm is determined by r deao 1 and r deao 2 where the gain is equal to - r deao 2/ r deao 1. the voltage of vr set at which the controller goes into fm and pwm simultaneously is equal to : vrset = d_in + (1+ r deao 1/ r deao 2) - (r deao 1/ r deao 2 ) 3 where 3 is the peak voltage of rtct vary in r set from vr set to vr set + 1.7 5 r deao 1/ r deao 2 will cause the duty cycle to vary from 50% to 0% while the frequency will vary propotionally according to 1.75* r deao 1/ r deao 2 where 1.75 is the peak-to-peak voltage of the rtct ramp. for proper operation, select r deao 2 value so that the current through r deao 2 {((d_in+) - 1.2)/ r deao 2} should be less than 5ua. vref d_in- - + . rtct vfb rt rset1 d_in+ rest2 vref rdeao1 vout vref rdeao2 ct + - . feao rf1 deao v tol + - . osc rset rf3 2.5v pwm
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 11 soft start and enable soft start of the fm and pwm is controlled by the selection of the external capacitor at css pin. a current source of 7.5ua supplies the charging current for the capacitor. soft start of the fm and pwm begins at 1.25v. the soft start pin css also serves as an enable function. the output drivers are enabled when css pin reached 1v. auto-retry mode during normal operation, css pin will be charged to 5.5v + vbe. when vfb exceeds 2.93v due to ilim exceeds 1v due to over current condition, output drivers are immediate set to low , and css begins to discharge with 0.75ua current source. when css pin is below 0.9v, 7.5ua curr ent source start charging the css pin. when css pin reaches 1v, the output drivers are re-enabl e and the controller goes into soft start mode. if over current condition still exists then, the outputs are imm ediately disabled, but css continues to charge toward 5v. when css reaches 5v, 7.5ua charging current is disabled and 0.75ua current source begins to discharge the css, and the cycle repeat until over current condition is removed. ocp setting 5.5 v+ vbe css ilimit 1v 0.9v 5v
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 12 typical applcation circuit c5 220pf/2kv pfc vref/1 0 r33 22k r20 (3a/600v) 2.2m r6 pgb c6 220pf/2kv 20n60c3 q1 1 2 3 r11 10 1000pf c20 1m 1% r1 c69 nc 10 r39 h15 l 1 0.1 r2 scs140p d4 (3a/600v) q2 2n2907 3 1 2 zd6 nc t1 tr18*10*10 4 3 1 2 (8a/600v) d23 nc vref/1 rl1 835nl-1a-b-c 9v 4 3 1 2 - + bd1 d10xb60 2 1 3 4 13k 1% r34 1m r23 f1 250v 6.3a hsb c2 0.22uf 275v 36.5k r23-2 vref/1 100pf c19 69.8k 1% r13 d28 1n5406 10k r25 1000pf c21 r92 nc q26 nc 3 1 2 1m 1% r3 4700p c77 0.47uf c11 470pf c18 (3a/600v) hfa08tb60 d7 0.1uf c25 0.047uf c22 0.1uf c71 t2 tr18*10*10 4 3 1 2 10k r100 + 220uf/450v c9 t rt1 2.5 ? /5a d29 1n5406 q3 2n2222 3 1 2 cs-270026 l4 7 5 9 102pf c10 0.47uf c16 (10a/600v) c3 0.22uf 275v 380vdc 0.47uf c17 1n5406 d6 vccp 380vdc h14 n 1 nc r9 2m r15 vccp 33n c12 pgib/1 27k r38 vccp bc1 1uf/450v 243k r23-1 1m r24 + 22uf/25v c70 13k r12 150k r17 fr1 910k 1/2w (20a/600v) u1 cm6502t/thh 14 13 6 1 11 7 8 5 9 10 4 2 3 12 ve a o vfb pgthl ieao vcc ramp1 gnd ss pgb pfc out vrms iac isense vref 47 r26 + c34 100uf/35v 11.5ts r56 150 r54 30 p6ke150a 5% zd1 1.4mh q9 2n2222 2 1 3 pc2a ltv817 +12vsb1 h26 1 r52 1k u2 tny277p 2 6 8 1 4 3 7 5 bp gnd gnd en d . gnd gnd d11 efm103 hz15-2 14.50~15.10v zd5 8ts vdd + c35 10uf/25v +12v r48 15k c40 0.1uf/25v 2a (1a/150v) byv-26e d12 + c76 100uf/400v q8 2n2222 2 1 3 + c28 100uf/25v ka431az1 ic1 2 3 1 r44 4.7k ? t3 ee-19 1 2 4 3 5 7 6 8 nc zd3 r94 5.6k r47 20 r45 3m r96 47k ? cn2 con2 1 2 standby d10 nc pc3a 817c 2 1 3 4 r50 7.5k r46 1m 11ts 380vdc c33 1000pf/50v 8ts r49 100 +12v q27 2n7002 pc2b ltv817 12vs vccp vcc r59 2.54k 1% c30 nc zd2 zmm(15v) r95 4.7k ? r93 22 on/off c36 nc c68 222m/250v y1 1n4007 d15 c41 nc 12vsb sf14 d13 r55 10k 1% 12vsb + c29 47uf/25v l1 dr6*8.3 85ts d14 sb10100 3 2 1 c75 0.47uf + c31 470uf/25v (1a/1000v) vcc r58 10k + c38 10uf/50v zd4 15.2~16.8v 1n4745a + c32 1200uf/16v on/off r43 1 1w(s) zd9 zmm(11v) c37 0.1uf/50v
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 13 r66 5.6 lp(1.7mh) + c53 680uf/25v r64 47k ? drvh 380vdc c51 0.1uf + c47 3300uf/16v d19 bav99 drvl c56 1uf/50v d20 bav99 2ts q14 fcp11n60 c52 nc 12vsyndrvh r98 10k ? drvhgnd c55 105pf -12v c42 nc c50 0.1uf +12v 27ts +12vis + c48 2200uf/16v + c46 2200uf/25v r67 470 d17 1n4148 12vsyndrvl r63 10 ? r61 47k ? 2ts q13 ir f2804pbf t4 pq3230 1 2 8 9 10 11 7 12 l2 160uh/pq512 6 9 10 5 r65 47k ? iplimit c49 0.1uf dc-dc -12v h40 1 d16 1n4148 iplimit jp11 nc c54 0.1uf 2ts out r60 10 ? r91 0 l3 130nh/20a hs6 hs 1 2 1 2 c43 82nf/800v q15 ir f2804pbf q12 fcp11n60 (2a/200v) d18 efm204 + c45 470uf/16v r62 47k ? r deao2 3m r89 22 ? c65 1uf/25v r73 316k 1% 12vs r77 220k ? 12vs c79 1nf vref d27 scs140p q16 2n2222 t5 ee-19 8 2 3 7 5 6 r74 750 vref/1 r84 220k r80 33k ? c64 47pf q22 2n2222 iplimit 12vs 12vs sls controller r88 1k ? u3 cm6901 family 15 1 2 3 4 14 13 7 8 9 12 11 5 16 6 10 vcc rset vfb feao d_in- pridrv pridrvb css ilim rt/ct srdrv srdrvb d_in+ vre f deao gnd +12v r72 12k c63 1uf/16v drvl q20 2n2222 pgi remoteoff/fpob r101 8.2k 12vs r40 5.1k r deao1 1m c58 1uf/50v q24 2n2222 q23 2n2907 r78 3.3k d22 scs140p d26 scs140p drvhgnd drvh q18 2n7002 r79 56k ? sd r41 20k r87 27k ? 12vs pgb c66 1000pf vref c62 nc 12vsyndrvl pc1a 817b 2 1 3 4 r75 36.5k ? 12vsyndrvh q21 2n2907 r85 6k ? c59 333 c67 0.1uf/25v r102 100k +12v q17 2n2907 c60 102pf r42 1.8k vref zd5 1n4148 sd 12vs c27 334 12vs q25 2n2907 r76 22 ? pgb from cm6502t & cm6502thh + c57 47uf/25v
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 14 package dimension 16-pin pdip (p16) pin 1 id 16-pin sop (s16)
cm6901 sls (src/llc+sr) controller with 1 fm+2 pwms 2012/05/09 rev2.0 champion microelectroni c corporation page 15 important notice champion microelectronic corporation (cmc) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the late st version of relevant information to ve rify, before placing orders, that the information being relied on is current. a few applications using integrated circuit products may involv e potential risks of death, persona l injury, or severe property or environmental damage. cmc integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. use of cmc products in such applications is understood to be fully at the risk of the cust omer. in order to minimize risks associated with the customer?s applications, th e customer should provide adequat e design and operating safeguards. cmc assumes to no liability to customer product design or appl ication support. cmc warrants the performance of its products to the specifications applicable at the time of sale. hsinchu headquarter sales & marketing 5f, no. 11, park avenue ii, science-based industrial park, hsinchu city, taiwan 21f., no. 96, sec. 1, sintai 5th rd., sijhih city, taipei county 22102, taiwan, r.o.c. t e l : +886-3-5679979 t e l : +886-2-2696 3558 f a x : +886-3-5679909 f a x : +886-2-2696 3559

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