UC3853
Overview
The UTC UC3853 is a high performance current mode PWM controller ideally suited for low standby power. Low VDD startup current make the power reliable on startup design and a large value resistor could be used to minimize the standby power.
- Peak Current Mode Control * Adjustable Switching Frequency * Adjustable Soft-start Timer * Adjustable Internal Ramp Compensation * Jittering Frequency ±6% of the Switching Frequency * Power-saving mode for high standby efficiency * Auto-recovery Primary OCP with 10ms Fixed Delay * Auto-recovery Brown-Out Detection * Delayed Operation Upon Start-up via an Internal Fixed Timer * UC384X-like UVLO Thresholds * VCC from 9V to 28V with Auto-recovery UVLO * Internal 350ns Leading Edge Blanking * Gate output voltage clamped at 15V * UC3853A: Maximum 47% Duty Cycle * UC3853B: Maximum 75% Duty Cycle SOP-8 Copyright © 2019 Unisonic Technologies Co., Ltd 1 of 14
