OB3611 High Power Factor, Highly Integrated Buck Regulator

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

Key Features

• High PF
• （
• PF>0.7
• ）
• Buck topology with low system cost
• High precision constant current regulation at universal AC input
• Low system cost and high efficiency
• Quasi-Resonant operation
• Programmable CC regulation
• Thermal foldback function to control LED output current
• Insensitivity to inductance and line voltage variation
• LED short circuit protection
• LED open loop protection
• Cycle-by-cycle current limiting

Applications

• LED lighting

Part Numbers and Specifications

Product family: On-Bright official page