OB3337 Dimmable Buck LED Lighting Controller

OB3337 is a dimmable buck LED lighting controller with high power factor, low THD and high constant current (CC) precision. It can achieve low system cost for the non-isolated lighting application. The proprietary CC control scheme is used and the system can achieve high power factor with constant on-time control scheme. Quasi-resonant (QR) operation and frequency modulation greatly improves the system efficiency. The advanced start-up technology is used to meet the start-up time requirement (<0.5s). The constant output current is compensated for tolerance of transformer inductance variation. And the line compensation is built in OB3337 for high precisely constant output current control. OB3337 offers a dimmable function, the LED current can be controlled by setting the duty cycle of PWM waveform into the DIM pin. OB3337 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), etc OB3337 is offered in SOP8 package

Key Features

• Dimmable LED current control
• High precision constant current regulation at universal AC input
• High PF
• Low THD
• Fast start-up
• Quasi-resonant and frequency modulation operation
• Built-in line compensation
• 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
• VDD over voltage protection
• Over temperature protection (OTP)

Applications

• LED lighting

Part Numbers and Specifications

Product family: On-Bright official page