HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

DESCRIPTION
The UTC UC3842B/3843B 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 UC3842B and UC3843B are the under-voltage lockout thresholds. The UC3842B ideally suited to off-line applications with UVLO thresholds of 16V(ON) and 10V(OFF), and UC3843B has UVLO thresholds of 8.4V(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