特性 Features

High-Voltage (700V) Startup Circuit

Very Low Startup Current (<30uA)

Under-Voltage Lockout (UVLO)

HV Discharge Technology to Remove X-cap

Discharge Resistors for Good Power Saving

50mW Standby Power

Non-Audible-Noise Green-Mode Control

65KHz Switching Frequency with Jittering for

Reducing EMI

Cycle-by-Cycle Peak Current Limiting

Internal Leading-Edge Blanking

Internal Slope Compensation

Gate Output Maximum Voltage Clamp

Internal 6mS Soft Start

Soft Driving for Reducing EMI

AC Input Brownout Protection with Hysteresis

Programmable Over Temperature Latch (OTP)

Function

Over-Voltage Protection (OVP) on VCC pin

Over-Load Protection (OLP)

Flexible Latch Shutdown Combination: OVP;

OVP+OTP

500mA Driving Capability

SOP-8 /SOP-7/DIP-8 Green Package

Applications

Adaptor/ Open Frame Power Supply

LCD Monitor/TV Power Supply

描述 Description

The GR8875 series is a highly-integrated, low

startup current, current mode PWM controller with

green-mode function, high-voltage start up circuit,

and provides several protections such as OLP, OVP,

and OCP for fault conditions. A high-voltage current

source supplies the start up current and the

traditional start up resistance can be saved in order

to reduce the start up power loss. The controller

also includes the leading-edge blanking of the

current sensing, internal slope compensation and

cycle-by-cycle peak current limiting. It is also

integrated soft driving for reducing EMI, gate output

voltage clamp function for protecting power

MOSFET.