OB3611

GENERAL DESCRIPTION

OB3611x is a high power factor, highly integrated buck regulator with advanced features to provide high efficiency control and high precision constant current output for LED lighting applications.

 

The proprietary CC control scheme is used to provide features of insensitivity to inductance and line voltage. Without external large compensation capacitor, the system can achieve high power factor with proprietary PFC control scheme.

 

OB3611x offers comprehensive protection coverage with auto-recovery features including LED open loop protection, LED short circuit protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), over temperature protection (OTP), thermal foldback etc.

 

 

OB3611x is offered in SOP-8/DIP8 package.

FEATURES

n High PF（PF>0.7）Buck topology with low system cost

n High precision constant current regulation at universal AC input

n Low system cost and high efficiency

n Quasi-Resonant operation

n Programmable CC regulation

n Thermal foldback function to control LED output current

n Insensitivity to inductance and line voltage variation

n LED short circuit protection

n LED open loop protection

n Cycle-by-cycle current limiting

n Built-in leading edge blanking (LEB)

n VDD under voltage lockout with hysteresis

n Over temperature protection (OTP)

 

APPLICATIONS

n LED lighting

 

 

TYPICAL APPLICATION

 

Product	BVdss(V)	Condition	90-264VAC	220Vac±20%
	Min		Open Frame	Open Frame
OB3611NCP	500	ILED<200mA	8.9W
OB3611NCP		ILED<150mA		20W
OB3611NCP-H	650	ILED<150mA	8.3W	16.3W
OB3611PCP	500	ILED<200mA	11.3W
OB3611PCP		ILED<150mA		24.6 W
OB3611TAP	500	ILED<300mA	17.7W	31.9W