General Description

The LD7537 is built-in with several functions, protection

and EMI-improved solution in a tiny package. It takes less

components counts or circuit space, especially ideal for

those total solutions of low cost.

The implemented functions include low startup current,

green-mode power-saving operation, leading-edge

blanking of the current sensing and internal slope

compensation. It also features more protections like

OLP (Over Load Protection) and OVP (Over Voltage

Protection) to prevent circuit damage occurred under

abnormal conditions.

Furthermore, the Frequency Swapping function is to

reduce the noise level and thus helps the power circuit

designers to easily deal with the EMI filter design by

spending minimum amount of component cost and

developing time.

Features

High-Voltage CMOS Process with Excellent ESD

protection

Very Low Startup Current (<20μA)

Current Mode Control

Green Mode Control

UVLO (Under Voltage Lockout)

LEB (Leading-Edge Blanking) on CS Pin

Internal Frequency Swapping

Internal Slope Compensation

OVP (Over Voltage Protection) on Vcc Pin

Brownout Protection

OLP (Over Load Protection)

300mA Driving Capability

Applications

Switching AC/DC Adaptor and Battery Charger

Open Frame Switching Power Supply