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2022-09-24 23:16:53
UC3843D1-Switching Power Supply Controller
Description is fixed for UC3842/UC3843/UC3844/UC3845 frequencycurrent mode PWM controller. They are specifically designed for off-line and DC-to-DC converter applications with minimal external components. These ICs feature precise trimmed duty cycle oscillator control, temperature compensated references, high gain error amplifiers, current sense comparators and a high current totempole output for driving power MOSFETs. The UC3844 and UC3842 have undervoltage lockout thresholds of 16V (on) and 10V (off). UC3843 and UC3845 are 8.5V (ON) and 7.9V (OFF). The range of UC3842 and UC3843 can be operated with 100% duty cycle. The UC3844 and UC3845 can operate at 50% duty cycle.
Features • Low startup current • Maximum duty cycle clamping • Hysteresis of UVLO • Operating frequency up to 500kHz