DESCRIPTION
The UTC UC3842B/3843B are specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components.
The UC3842B has UVLO thresholds 16V (on) and 10V(off), ideally suited for off-line converters. The UC3843B is tailored for lower voltage applications having UVLO thresholds of 8.5V(on) and 7.6V(off).
   
FEATURES
* Trimmed Oscillator for Precise Frequency Control
* Oscillator Frequency Guaranteed at 250kHz
* 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 Startup and Operating Current