GENERAL DESCRIPTION
OB3652x is primary side control offline LED lighting power switch 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.
OB3652x 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.
OB3652x is offered in SOP-8 or DIP8 packages.
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