LED lighting has evolved into a promising solution for replacing conventional lighting sources, such as fluorescent and incandescent lights. However, designers face several obstacles in residential and commercial LED lighting applications up to 20 W including bulb, down lighting (GU10/E17, E26/27, PAR30/38) and tube/bar. Implementing dimming capabilities in a conventional TRIAC dimmer infrastructure is challenging because of dimmer compatibility. Additionally, small space requirements remain a consideration.
To help designers address these challenges, Fairchild Semiconductor developed the FL7730 single-stage primary side regulation (PSR) controller with power factor correction (PFC), TRIAC and analog dimming compatibility, as well as the FL7732 for non-dimming applications.
The FL7730 is an active PFC controller for single-stage flyback topology application. Implemented with Fairchild’s analog sensing technology, the device can achieve TRIAC dimming control without flicker over the full range of 0% to 100% light output.
The FL7730 and FL7732 combine primary-side regulation and a single-stage PFC topology to minimise total bill-of-material (BOM) count, such as an input electrolytic capacitor and feedback circuitry, therefore allowing for a more compact, longer life and lower system cost design.
To improve power factor and THD, both devices feature constant on-time control with an internal error amplifier and low bandwidth compensator. Precise constant current accuracy/control (±5%) regulates accurate output current, independent of input and output voltage, allowing designers to achieve high and improved lighting quality. Operating frequency is proportionally adjusted by output voltage in both devices to guarantee DCM operation with optimised PF/THD and simpler design.
Excellent power factor (0,9), low total harmonic distortion (Class C) and power efficiency of up to 85% for the FL7730 (greater than 85% for the FL7732 in non-dimming applications) allow these devices to meet worldwide energy saving regulations.
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