Power Factor Controller IC for High Power Factor LHDTHDprotections 

Features

l Low Startup Current

l Low Quiescent Current

l Under-Voltage Lockout with Hysteresis

l Zero Current Detector for Critical Conduction Mode

l Dynamic and Static Output Over-Voltage Protection

l Gate Output Maximum Voltage Clamped

l Internal Restart Timer

l 1% Internal Reference Voltage

l Internal Leading-Edge Blanking

l +/-500mA Totem Pole Output with Active Shut Down

Applications

l Power Supply PFC Pre-Regulator

l LED Lighting Application

l Desktop PC

l Electronics Ballast for Fluorescent Lamp

Description

The GR8762 is a current-mode PFC controller operating in critical conduction mode. The sinusoidal current is taken from the single phase line supply and stabilized DC voltage is available at the output. The IC includes a highly liner multiplier which can reduce AC input current distortion, that allows wide-range-mains operation with an extremely low THD, even over a large load range.

The output voltage is controlled by an error amplifier and an internal voltage reference. An effective two-step (dynamic and static) OVP enables to safely handle over voltages either occurring at start-up or resulting from load disconnection. The totem-pole output stage capable of ±500mA driving capability is suitable for big MOSFET or IGBT. It is available in both 8-pin DIP and 8-pin SOP package.

Typical Application Circuit

Package