GENERAL DESCRIPTION

OB3652P is a primary side control offline LED

lighting controller with very low operation current

which can achieve accurate LED current for an

isolated lighting application in a single stage

converter.

It significantly simplifies the LED lighting system

design by eliminating the secondary side feedback

components and the opto-coupler, and also the

auxiliary winding inductance. A HV 600V power

switch is also integrated into the device. The LED

current can be adjusted externally by the sense

resistor Rs at CS pin and high precision constant

current regulation is realized.

OB3652P offers comprehensive protection

coverage with auto-recovery features including

open loop protection, short circuit protection,

cycle-by-cycle current limiting, built-in leading

edge blanking, VDD under voltage lockout (UVLO),

latched over temperature protection (OTP), etc.

FEATURES

 High precision Constant Current Regulation at

Universal AC input

 Primary-side Sensing and Regulation Without

TL431 and Opto-coupler

 Sense and supply without auxiliary winding

inductance

 Low System Cost and High Efficiency

 Low operation current

 Programmable CC Regulation

 Built-in Primary winding inductance

compensation

 Built-in line compensation

 Short Circuit Protection

 Open Loop Protection

 Cycle-by-Cycle Current Limiting

 Built-in Leading Edge Blanking (LEB)

 VDD Under Voltage Lockout with Hysteresis

 Latched over temperature protection (OTP)

APPLICATIONS

 LED lighting