Description
The FL6961 is a general lighting power controller for low- to high-power lumens applications requiring power factor correction. It is designed for flyback or boost converter operating in Boundary Mode.
The FL6961 provides a controlled on-time to regulate the output DC voltage and achieves natural power factor correction (PFC). The maximum on-time of the external switch is programmable to ensure safe operation during AC brownouts. An innovative multi-vector error amplifier provides rapid transient response and precise output voltage clamping. A built-in circuit disables the controller if the output feedback loop is opened. The startup current is lower than 20µA and the operating current is less than 6mA. The supply voltage can be up to 25V, maximizing application flexibility.

Features
■ Boundary Mode PFC Controller
■ Low Input Current THD
■ Controlled On-Time PWM
■ Zero-Current Detection
■ Cycle-by-Cycle Current Limiting
■ Leading-Edge Blanking Instead of RC Filtering
■ Low Startup Current: 10µA Typical
■ Low Operating Current: 4.5mA Typical
■ Feedback Open-Loop Protection
■ Programmable Maximum On-Time (MOT)
■ Output Over-Voltage Clamping Protection
■ Clamped Gate Output Voltage: 16.5V

Applications
■ General LED Lighting
■ Industrial, Commercial and Residential Fixtures
■ Outdoor Lighting: Street, Roadway, Parking, Construction, and Ornamental LED Lighting