UC3845A-BW
DESCRIPTION
The UC3842A-BW/43A-BW/44A-BW/45A-BW are fixed frequency current mode PWM controller. They are specially designed for OFF- Line and DC to DC converter applications with a minimal external ponents. Internally implemented circuits include a trimmed
PIN CONNECTION
(TOP VIEW) oscillator for precise duty cycle control, a temperature pensated reference, high gain error amplifier, current sensing parator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting.
The UC3842A-BW and UC3844A-BW have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the UC3843A-BW/45A-BW are 8.4V (on) and
7.6V (off).
The UC3842A-BW and UC3843A-BW can operate within 100% duty cycle. The UC3844A-BW and UC3845A-BW can operate within 50% duty cycle.
The UC384XA-BW has Start-Up Current 0.17m A (typ).
The UC384XA-BW are revised UC384XAM and differ by higher Unity Gain...
