OB3605

GENERAL DESCRIPTION

OB3605Ax is a high current precision, non-isolated power switch for LED lighting. It works under transition mode.

It significantly simplifies the LED lighting system design by eliminating the auxiliary winding inductance and works under low current. A 500V power switch is also integrated into the device. The LED current can be adjusted externally by the sense resistor Rcs at CS pin and high precision constant current regulation is realized. It integrates an external dimming pin which inputs PWM signal and can dim by changing the duty cycle of the PWM signal.

OB3605Ax offers comprehensive protection coverage with auto-recovery features including LED string open protection, LED string short circuit protection,  cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), Thermal foldback, etc.

OB3605Ax is offered in DIP7 /SOP7package.

FEATURES

n External PWM dimming

n High precision Constant Current Regulation at Universal AC input

n Sense and supply without auxiliary winding inductance

n Low System Cost and High Efficiency

n Low operation current

n Programmable CC Regulation

n Transition Mode operation

n Built-in Primary winding inductance compensation

n Programmable LED string open circuit protection

n LED string short circuit protection

n Cycle-by-Cycle Current Limiting

n Built-in Leading Edge Blanking (LEB)

n VDD Under Voltage Lockout with Hysteresis

n Thermal foldback

 

APPLICATIONS

n LED lighting

    

 

TYPICAL APPLICATION

 

 

 

Product	BVdss(V)	Condition	90-264VAC	175Vac~264Vac
	Min		Open Frame	Open Frame
OB3605ARASP-J	500	Io≤0.35A	28W
		Io≤0.3A		51.8W
OB3605APASP-J	500	Io≤0.3A	19W
		Io≤0.25A		43W
OB3605APJP-J	500	Io≤0.3A	14W
		Io≤0.25A		30W