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.
n High precision Constant Current Regulation at Universal AC input
n Primary-side Sensing and Regulation Without TL431 and Opto-coupler
n Sense and supply without auxiliary winding inductance
n Low System Cost and High Efficiency
n Low operation current
n Programmable CC Regulation
n Built-in Primary winding inductance compensation
n Built-in line compensation
n Short Circuit Protection
n Open Loop Protection
n Cycle-by-Cycle Current Limiting
n Built-in Leading Edge Blanking (LEB)
n VDD Under Voltage Lockout with Hysteresis
n Latched over temperature protection (OTP)
n LED lighting
Note: The suggested range of Csw is 47pF to 200pF.