GENERAL DESCRIPTION

CX7502 is a high performance Quasi Resonant (QR) Primary Side Regulation (PSR) PWM power switch with high precision CV/CC control ideal for charger applications.

In CV mode, CX7502 adopts Multi Mode QR Control which uses the hybrid of AM (Amplitude Modulation) mode and (Frequency Modulation) FM mode to improve system efficiency and reliability. In CC mode, the IC uses PFM control with line and load CC compensation. The IC can achieve fast dynamic response. The built-in Cable Drop Compensation (CDC) function can provide excellent CV performance.

CX7502 integrates functions and protections of Under Voltage Lockout (UVLO), VDD over Voltage Protection (VDD OVP), Cycle-by-cycle Current Limiting (OCP), Short Load Protection (SLP), On-Chip Thermal Shutdown, VDD Clamping, etc.

FEATURES

● Low Cost Solution Built-in 800V power BJT

● Quasi-Resonant Primary Side Regulation(QR-PSR) Control with High Efficiency

● Multi-Mode PSR Control

● Fast Dynamic Response

● Built-in Dynamic Base Drive

● Audio Noise Free Operation

● ±4% CC and CV Regulation

● Low Standby Power<70mW

● Programmable Cable Drop Compensation(CDC) in CV Mode

● Built-in AC Line & Load CC Compensation

● Build in Protections:

● Short Load Protection (SLP)

● Cycle-by-Cycle Current Limiting

● Leading Edge Blanking (LEB)

● Pin Floating Protection

● VDD OVP & UVP & Clamp

● Over temperature protection(OTP)

● Available with Versions in SOP-7 Package

APPLICATIONS

● Battery Chargers for Cellular Phones

● AC/DC Power Adapter and LED Lightings

TYPICAL APPLICATION CIRCUIT

Pin Configuration

Pin Description

Block Diagram