General Description

The LD9532 is built in a multi-mode PWM controller and

integrated a 650V MOSFET. The multi-mode PWM

controller which consists of Quasi-Resonant (QR) PWM

control for light load condition and Continue Conduction

Mode (CCM) for heavy load condition. Moreover, the

QR controller not only gains the system performance,

but also brings the worse EMI capability, while the

frequency swapping function of LD9532 can reduce the

EMI emission of SMPS and helps the power circuit

designers to simply deal with EMI filter and saves

several component and developing time.

The LD9532 is implemented in DIP-8 package, and

includes the comprehensive protection function, such as

Over Load Protection (OLP), Over Voltage Protection

(OVP), Output Short Circuit Protection (OSCP) and

internal Over Temperature Protection (OTP).

Features

 Secondary-side feedback control with

quasi-resonant + CCM operation

 Built-in 650V MOSFET Switch

 Low Startup Current (<1A)

 Ultra-low operating current at light load

 Current Mode Control with Cycle-by-Cycle Current

Limit

 Green Mode Control

 UVLO (Under Voltage Lockout)

 LEB (Leading-Edge Blanking) on CS Pin

 VCC OVP (Over Voltage Protection)

 Adj. OVP (Over Voltage Protection) on FB pin.

 Adj. UVP (Under Voltage Protection) on FB pin.

 OLP (Over Load Protection)

 Internal OTP (Over Temperature Protection)

Applications

 Switching AC/DC Adaptor