UC1843 Datasheet PDF

●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