UC3844T Overview
Description
The UC384XT 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 a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, 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.
Key Features
- to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count
- The output stage, suitable for driving N-Channel MOSFETs, is low in the offstate
- Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges
- The UC3842T and UC3843T can operate to duty cycles approaching 100%
