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CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 1 general description features CM6900G is resonant controller tailor for series topology with synchronous operation to achieve high efficiency to meet today?s power need. it is used for dc-dc conversion in the offline application. light load regulation is accomplished by transitioning the controller from frequency modulation mode into pwm mode. z supply voltage range : 10v to 15v. z typical peak drive from 12v supply : (pmos~200 ohm and nmos~100 ohm). z uvlo=13v with 3v hystetesis. z reference ok comparator. z fm/pwm mode operation. z softstart capability with shutdown function. z latch or auto-restart during current limit or ovp. applications CM6900G pin configuration z dc-dc power supply. z led lighting power supply z server power z industrial power supply z high power adaptor ordering information part number temperature range package CM6900Gis -40 to 125 16-pin soic (s016) *note: g : suffix for pb free product
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 2 typical applcation circuit ct-uu-9.8 t5 4 3 1 2 d12 bav99 c36 0.1uf/63v d10 scd14 q17 si4856ady q16 si4856ady 5vsb c47 0.1uf/63v cn4 cn2.54-p6 1 2 3 4 5 6 1 2 3 4 5 6 cn2 cn2.54-p10 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 d11 scd14 q14 cmt08n50 c40 0.1uf/63v +vdc drvh c31 68nf/630v enable r44 47k ? c41 0.1uf/63v iplimit c30 100pf/1kv 24vsyndrvl hs3 hs 1 2 1 2 +12v t4 erl-35 9 1 2 10 13 14 11 12 15 16 + c38 1000uf/16v q15 cmt60n06 l6 2uh/3a cn3 cn2.54-p10 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 q12 cmt08n50 +12v c42 470nf/25v l5 0.8uh/10a 24vsyndrvh c37 100pf/1kv c35 0.1uf/63v hs2 hs 1 2 1 2 +24v c32 47nf/630v drvl +24v +24v lp(2.5mh) 24vsyndrvl r49 47k ? cn5 cn2.54-p6 1 2 3 4 5 6 1 2 3 4 5 6 l4 200uh/rm8 r50 330 ? 1/4w drvhgnd r43 10 ? d13 bav99 24vsyndrvh + c33 1000uf/35v r45 47k ? + c34 1000uf/35v r46 10 ? r47 47k ? q13 cmt60n06 + c39 1000uf/16v cn6 1 2 1 2 r67 nc r52 4.7 ? 1/4w 12vs +24v 12vs t6 ee19 8 2 3 7 5 6 12vs q24 bc817 c56 0.1uf/25v c51 1uf/16v 12vs c52 104pf r68 nc +12v r57 910 ? c53 0.1uf/25v d14 scd12 r55 390 ? vref q25 bc807 24vsyndrvl drvh q23 bc807 c44 2.2uf/63v + c43 100uf/25v 12vs r73 39k ? vref q18 bc817 c55 820pf/25vn drvl r65 4.7k ? c49 470pf/25vn r66 33k ? c50 10nf/25v r70 100k ? drvhgnd c54 0.1uf/25v +12v r53 6.8k ? q20 bc807 r56 620 ? r51 4.7 ? 1/4w r63 150k 12vs q22 bc807 vref sd q19 bc817 24vsyndrvh r69 240k ? r64 6.8k ? q21 bc817 u6 cm6900 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+ vref deao gnd 12vs iplimit r54 15k r71 13k ? r72 1k ?
CM6900G resonant controller 2007/11/22 rev1.0 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. 0 5.5 v 2 vfb non-inverting input into resonant error amplifier and ovp input. 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 pridrv primary side mosfet driver output. -0.3 vcc v 14 pridrvb primary side mosfet driver output. -0.3 vcc v 15 vcc positive supply for the ic 10 15 17.5 v 16 vref buffered output for the 7.5v voltage reference 7.5 v
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 4 block diagram v to i 2.5v vfb + - rset feao d_in+ + - d_in- - + - deao 1.25v + vcc + - shdn 1v osc rt ct css logic uvlo/ref vcc vref gnd + - ovp 2.9v + - ilim 1v ilim srdrvb srdrv pridrvb pridrv clk 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 -0.3 to 7.5 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 error amplifier voltage -0.3 to vref+0.3 v feao resonant error amplifier out put voltage -0.3 to vref+0.3 v vfb non-inverting input into resonant er ror amplifier voltage -0.3 to vref+0.3 v rset v to i voltage -0.3 to vref+0.3 v
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 5 electrical characteristics (v cc =12v, rtct freq. =100 khz, duty cycle=50% , te mp=25 degree c, unless otherwise specified.) parameter symbol conditions min. typ. max. unit vref (pin 16) reference voltage vref ta=25?c; iref=1ma 7.4 7.5 7.6 v line regulation 11v < vcc < 16.5v 10 25 mv load regulation 0ma < iref < 7.5ma 10 25 mv vcc (pin 15) vcc start up voltage vstart 12.5 13 13.5 v uvlo hysteresics hyst 3 3.5 v operating current icc 1 ma pridrv,pridrvb,srdrv,srdrvb (pin 11,12,13 and 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 current iout 0.12 a iout peak sink current iout 0.12 a pmos rdson rout 200.0 250.0 ohm nmos rdson rout 100.0 150.0 ohm dead time between pridrv and pridrvb tdead 400 ns rising edge delay between pridrv and srdrv tdelay 500 ns falling edge delay between srdrv and pridrv tdelay 500 ns duty cycle range 0 50 % ilim (pin 8) threshold voltage vth 0.9 1 1.1 v css (pin 7) soft start current iss 7.5 ua enable voltage ven 0.9 1.0 1.1 v enable hysteresis vhyst 75 mv auto-restart upper threshold vup 4.85 5.0 5.15 v auto-restart lower threshold vlw 1-vhyst v
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 6 electrical characteristics (v cc =12v, rtct freq. =100 khz, duty cycle=50% , te mp=25 degree c, unless otherwise specified.) parameter symbol conditions min. typ. max. unit feao resonant error amplifier (pin 3) input voltage range 6 v transconductance gm 135 umho feedback reference voltage 2.45 2.5 2.55 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 -15 ua source current 15 ua open loop gain 60 db deao pwm error amplifier (pin 6) input voltage range 6 v transconductance gm 135 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 -15 ua source current 15 ua open loop gain 60 db rtct oscillator;rt=61k;ct=470pf (pin 8) initial accuracy ta=25?c 95 100 105 khz volatge stability 11v < vcc < 16.5v 1 % temperature stability 2 % ramp valley to peak voltage 2 v ct discharge time 350 ns maxmum duty cycle deao > 3.0v 50 % minimum duty cycle deao < 1.2v 0 % vfb ovp comparator threshold voltage 2.94 v vcc ovp comparator input voltage range 17.5 v
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 7 timing diagram delay time pridrv pridrvb dead time delay time srdrvb srdrv 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 t deadtime = 2.125v/2.5ma * ct = 850 * ct 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
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 8 v to i 2.5v vfb rset osc vref rt ct + - pwm section pulse width modulator pwm control is used in voltage mode. in applicaton1, wh en feao is equal to the external reference voltage at d_in+ due to light load, the frequency of the oscillator is fixed at a value determined by the voltage at feao, and the controller enters into pwm mode. in this mode, both frequency modulator and pulse width modulator are active. in application 2 ,the offset voltage vos is externally generated between the v fb pin and d_in- through a resistor network r f1 , r f2 and r f3 in order to separate the interaction between fm mode and pwm mode. vos = 2.5vr f2 /r f3 when the output load is reduced to a point where feao is railed to its maximum value of 5v+ vbe, the frequency is fixed at a value determined by 5v+vbe. further reduction in load will caus e the controller to go into pwm mode when the voltage at the vfb pin is 2.5v+vos. during this light load operation, fm error amplifier is in open-loop mode while pwm is in closed-loop mode. compensation is accomplished by connecting r and c in series to the deao pin. in application 3 , low gain configuration accomplished by connecting r f4 and r f5 in the closed loop configuration . the gain for the pwm is determined by r f4 and r f5 where the gain is equal to -r f5 /r f4 . the voltage of vr set at which the controller goes into fm and pwm simultaneously is equal to : vrset = d_in + (1+r f4 /r f5 ) - (r f4 /r f5 ) 3 where 3 is the peak voltage of rtct varyin r set from vr set to vr set + 1.7 5 r f4 /r f5 will cause the duty cycle to vary from 50% to 0% while the frequency will vary propotionally according to 1.75*r f4 /r f5 where 1.75 is the peak-to-peak voltage of the rtct ramp. for proper operation, select r f5 value so that the current through r f5 {((d_in+) - 1.2)/r f5 } should be less than 5ua.
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 9 v to i 2.5v vfb osc vref rt ct + - rf1 rf3 vout + - vref rset + - d_in+ deao rt ct pwm d_in- feao application 1 v to i 2.5v vfb osc vref rt ct + - rf1 rf2 vout + - rset + - d_in+ deao rt ct pwm d_in- feao rf3 application 2 v to i 2.5v vfb osc vref rt ct + - rf1 rf3 vout + - vref rset + - d_in+ deao rt ct pwm d_in- feao application 3 rf4 rf5
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 10 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 8ua supplies the charging current for the capacitor. so ft start of the fm and pwm begins at 1.25v. the soft start pin css also serves as an enable function. the out put 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 ovp or ilim exceeds 1v due to over current conditi on, output drivers are immediate set to low , and css begins to discharge with 3.3ua current source. when css pin is below 0.9v , 8ua current source start charging the css pin. when css pin reaches 1v, the output drivers are re-enable and the controller goes into soft start mode. if ovp or over current condition still exists then, the outputs are immediately disabled, but c ss continues to charge toward 5v. when css reaches 5v, 8ua charging cu rrent is disabled and 3.3ua current s ource begins to discharge the css, and the cycle repeat until ovp or over current condition is removed.
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 11 package dimension 16-pin psop (ps16)
CM6900G resonant controller 2007/11/22 rev1.0 champion microelectroni c corporation page 12 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 7f-6, no.32, sec. 1, chenggong rd., nangang district, taipei city 115, taiwan, r.o.c. t e l : +886-3-5679979 t e l : +886-2-2788 0558 f a x : +886-3-5679909 f a x : +886-2-2788 2985

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