SG6846ACSY Datasheet PDF - Fairchild

●Description

●The SG6846A is especially designed for SMPS with surge-current output, incorporated with a two-level OCP function. Besides the cycle-by-cycle current limiting, if the switching current is higher than two thirds the peak

●current threshold for 1700ms, over-current protection is activated such that the SG6846A is latched off.

●Features

●Low Startup Current: 8µA

●Low Operating Current: 3.7mA

●Peak-Current Mode of Operation with Cycle-by Cycle Current Limiting

●PWM Frequency Continuously Decreasing with Burst Mode at Light Loads

●VDDOver-Voltage Protection (OVP)

●AC Input Brownout Protection with Hysteresis

●Constant Output Power Limit (Full AC Input Range)

●Internal Latch Circuit for OVP, OTP, and OCP

●Two-level OCP Delay: 1600ms

●Output Short-Circuited Delay Time: 100ms

●Programmable PWM Frequency with Frequency Hopping

●OCP Threshold is Half Peak Current Limit

●Feedback Open-loop Protection with 1700ms Delay

●Built-in Soft-Start

●Applications

●General-purpose switch-mode power supplies and flyback power converters, including:

●Power Adapters

●Open-frame SMPS

●SMPS with Surge-current Output, such as for Printers, Scanners, Motor Drivers