UTC3843E Datasheet | YOUWANG

DESCRIPTION The UTC3843D/E provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1m A,a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM parator which also provides current limit control,and a totem pole output stage designed to source or sink high peak current.The output stage, suitable for driving N channel MOSFETs,is low in the off state. DIP-8 FEATURES - Optimized for off-line and DC to DC converts - Low start up current(<1m A) - Automatic feed forward pensation - Pulse-by-Pulse current limiting - Enhanced load response characteristics - Under-voltage lockout with hysteresis - Double pulse Suppression - High current totem pole output - Internally trimmed bandgap reference - 500k Hz operation - Low Ro error amp SOP-8 ORDERING INFORMATION Device Package UTC3248D DIP-8-300-2.54 UTC3248E SOP-8-225-1.27 BLOCK DIAGRAM Vref Internal Bias P 1 CURRENT SENSE 3 RT/CT 4 1/2Vref ERROR AMPLIFIER 5V REF S/R Vref Good Logic 1/3Vref U.V.L.O CURRENT...