OB3338CCP Dimmable Offline Controller

OB3338C is a dimmable offline controller with high constant current (CC) precision. It can achieve low system cost for an isolated lighting application by primary side control in a single stage converter. The proprietary CC control scheme is used. Quasi-resonant (QR) operation and clamping frequency 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 OB3338C for high precisely constant output current control. OB3338C offers a dimmable function, the LED current can be controlled by setting the duty cycle of PWM waveform into the DIM pin. OB3338C 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 OB3338C is offered in SOP8 package

Key Features

• Dimmable LED current control
• Primary-side sensing and regulation without TL431 and opto-coupler
• High precision constant current regulation
• Fast start-up
• Quasi-resonant 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