DESCRIPTION
●The UC1842/3/4/5 family of control ICs 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 1mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched
●operation, a PWM comparator 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.
●FEATURES
●• Optimized For Off-line And DC To DC Converters
●• Low Start Up Current (<1mA)
●• Automatic Feed Forward Compensation
●• 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
●• 500khz Operation
●• Low ROError Amp
