Transcription of High performance current mode PWM controller
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High performance current mode PWM controller
UC2842B/3B/4B/5 BUC3842B/3B/4B/5 BMarch 1999 HIGH performance current MODE PWM OSCILLATOR FOR PRECISE FRE-QUENCY FREQUENCY GUARANTEEDAT MODE OPERATION TO FEED FORWARD PWM FOR CYCLE-BY-CYCLECURRENT TRIMMED REFERENCE WITHUNDERVOLTAGE current TOTEM POLE LOCKOUT WITH START-UP AND OPERATING CURRENTDESCRIPTIONThe UC384xB family of control ICs provides the nec-essary features to implement off-line or DC to DCfixed frequency current mode control schemes witha minimal external parts count. Internally imple-mented circuits include a trimmed oscillator for pre-cise DUTY CYCLE CONTROL under voltage lock-out featuring start-up current less than , a pre-cision reference trimmed for accuracy at the erroramp input, logic to insure latched operation, a PWMcomparator which also provides current limit control,and a totem pole output stage designed to sourceor sink hig
uc2842b/3b/4b/5b uc3842b/3b/4b/5b march 1999 high performance current mode pwm controller. trimmed oscillator for precise fre-. quency …
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