UC3844

DESCRIPTION

The UTC UC3844/3845 are high performance fixed frequency

current mode controllers that specifically designed for Off-Line and

DC to DC converter applications with minimal external parts count.

The differences between UC3844 and UC3845 are the

maximum duty cycle ranges and under-voltage lockout thresholds.

The UC3844 ideally suited to off-line applications with UVLO

thresholds of 16V (ON) and 10V (OFF) , and UC3845 has UVLO

thresholds of 8.5V (ON) and 7.6V (OFF)  for lower voltage applications.

 FEATURES

* Operation output switching frequency up to 500 kHz

* Automatic feed forward compensation

* Latching PWM for cycle-by-cycle current limiting

* High current totem pole output

* Internally trimmed reference with under voltage lockout

* UVLO with hysteresis

* Low startup and operating current

规格书UC3844