General Description
The LD9535 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 LD9535 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 LD9535 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