OB3626 Buck Regulator

OB3626x is highly integrated Buck regulator with advanced features to provide high efficiency control and high precision constant current output for LED lighting applications. OB3626x features variable fade-in time(gradual on) control. Through charging an external capacitor connected to FT pin, the fade-in time could be programmed. The proprietary CC control scheme is used and high precision constant current regulation is realized. OB3626x 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 OB3626x is offered in DIP-8 & SOP-7 package

Key Features

• High precision constant current regulation at universal AC input
• Programmable fade-in time
• Low system cost and high efficiency
• Quasi-Resonant operation
• Programmable CC regulation
• Thermal foldback function to control LED output current
• Insensitive to inductance and line voltage variation
• LED short circuit protection
• LED open loop protection
• Cycle-by-cycle current limiting
• Built-in leading edge blanking (LEB)
• VDD under voltage lockout with hysteresis
• Over temperature protection (OTP)

Applications

• LED lighting

Part Numbers and Specifications

Product family: On-Bright official page