SG6846CLDZ

高度集成绿色模式PWM控制器 Highly Integrated Green-Mode PWM Controller

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