General Description

The LD7523 is a low startup current, current mode PWM

controller with green-mode power-saving operation. The

SOP-8/DIP-8 package integrated functions such as the

leading- edge blanking of the current sensing, internal

slope compensation, line compensation, and several

protection features. The protection functions include

cycle-by-cycle current limit, OVP, OLP, and brownout

protection. It provides the users a high efficiency, low

external component counts solution for AC/DC power

applications.

Furthermore, to satisfy various protection requirements,

both latch-mode protection and auto-recoverable

protection can be easily achieved by configuring LD7523

on different operation modes.

The special green-mode control is not only to achieve the

low power consumption but also to offer a

non-audible-noise operation when the LD7523 is

operating under light load or no load condition.

Features

z High-Voltage CMOS Process with Excellent ESD

protection

z Very Low Startup Current (< 35μA)

z Current Mode Control

z Non-audible-noise Green Mode Control

z UVLO (Under Voltage Lockout)

z LEB (Leading-Edge Blanking) on CS Pin

z Internal Slope Compensation

z Programmable Line Compensation

z OVP (Over Voltage Protection)

z OLP (Over Load Protection)

z Brownout Protection

z Built in OLP De-Latch Timer

z 500mA Driving Capability

Applications

z Switching AC/DC Adaptor and Battery Charger

z Open Frame Switching Power Supply

z LCD Monitor/TV Power