UC2842BD1 Datasheet PDF - ST Microelectronics

The UC2842BD1 is a high-performance current-mode Pulse Width Modulator (PWM) Controller 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. The output stage, suitable for driving N-channel MOSFETs, is low in the off-state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges.

● Trimmed oscillator for precise frequency control

● Current mode operation to 500kHz

● Automatic feed forward compensation

● Latching pwm for cycle-by-cycle current limiting

● Internally trimmed reference with undervoltage lockout

● High current totem pole output

● Undervoltage lockout with hysteresis

● Low start-up and operating current