Current Mode PWM Power Switch

Features

     l Current Mode PWM

     l Very Low Startup Current

     l Under-Voltage Lockout (UVLO)

     l Non-Audible-Noise Green-Mode Control

     l Fixed Switching Frequency of 50KHz

     l Cycle-by-Cycle Peak Current Limiting

     l Internal Leading-Edge Blanking

     l Internal Slope Compensation

     l Internal 5mS Soft Start

     l VCC Over Voltage Clamp

     l Over-Voltage Protection (OVP) on VCC Pin

     l Over-Load Protection (OLP)

Description

GR8935LA integrates a PWM controller and high voltage power MOSFET of 650V.  GR8935LA has the features of very low startup current and current mode PWM control with green-mode function at light load. These features enable the power supply to easily meet even the strictest power conservation requirements. The integrated functions of GR8935LA also include the leading-edge blanking of the current sensing, internal slope compensation, cycle-by-cycle peak current limiting and soft start.  OCP, OVP and OLP provide protection performance for fault conditions. To protect the power MOSFET from being damaged by supply over voltage, the internal gate voltage of GR8935LA is clamped at 18V.

GR8935LA improves the performance and reduces the cost of power supplies.

Applications

     l Switching AC/DC Power Battery Charger

     l Digital Camera

     l Open-Frame SMPS

     l PDA Power Supply

Typical Application Circuit

Package