General Description
The LD5537B1/I1 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)、OVP (Over Voltage Protection)
and AC BNI / BNO 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 (<3A)
 Multi-Mode PWM controller
 Current Mode Control
 Green Mode Control
 UVLO (Under Voltage Lockout)
 LEB (Leading-Edge Blanking) on CS Pin
 Internal Frequency Swapping, Slop Compensation
 OVP (Over Voltage Protection) on VCC and CS Pin
 Adjustment input AC BNI / BNO
 OLP (Over Load Protection)
 OSCP (Output Short Circuit Protection)
 250mA/-500mA Driving Capability

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