UC3844 Datasheet PDF - UTC

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

● Output deadtime adjustable from 50% to 70%

● 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