Description

A highly integrated PWM controller, SG6846C provides several features to enhance the performance of flyback

converters. To minimize standby power consumption, a proprietary green-mode function provides off-time

modulation to continuously decrease the switching frequency under light-load conditions. Under zero-load

conditions, the power supply enters burst-mode, which completely shuts off PWM output.

Features

Low Start-up Current: 8µA

Low Operating Current: 3.7mA

Peak-current Mode 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: 110ms

Programmable PWM Frequency with Frequency Hopping

OCP Threshold is Half Peak Current Limit

Feedback Open-loop Protection with 110ms Delay

Soft Start-up Time: 5ms

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