开关电源控制环设计

Switchingpowersupplycontrolloopdesign(ASTEC-ApplicationNote5)smartway1.2.2.12.220dB12.320dB90290BOOSTBUCK-BOOST33.03.140-180DC180180DC0045453.24Fcs223.3PWM4.PWM564.1H(s)4.2G1(S)ESRR1+R2=RFB7ESRRSENSEG1(S)RFBfPOLE=1/2*π*RFB+ESR*CfZERO=1/2*π*ESR*CG1(S)84.3PWMG2(S)AS3842PWMR5R65R5AS3842R5AS3842SecondaryerroramplifierwiththeAS431AS3842COMPVCATHODEAS431CTRR5(R6)RCOMPAS3842COMP9VCOMPISENSEIPRIMARYVCOMPISECONDARY94VCOMP36PWMG2(s)4.4G3(S)PWM104.5111805.150W13121186.71513121465141516.6PWMAS3842VCOMPVCOMPPWM2006-6-6