General Description
The LD7538 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 (<14A)
 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
 Adjustment OVP(Over Voltage Protection) on CS Pin
 Adjustment OCP(Over Current Protection) on CS Pin
 OTP (Over Temperature Protection) through a NTC
 OLP (Over Load Protection)
 250/-500mA Driving Capability

Applications
 Switching AC/DC Adaptor and Battery Charger
 Open Frame Switching Power Supply