Date: 13/02/2012

LED driver compatible with triac dimming

Fairchild Semiconductor has 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. The device supports both TRIAC and analog dimming. Implemented with Fairchild's unique 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 minimize total bill-of-material (BOM) count, such as an input electrolytic capacitor and feedback circuitry.

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 percent) 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 optimized PF/THD and simpler design.

PF (=0.9), low total harmonic distortion (THD) (Class C) and power efficiency of up to 85 percent for the FL7730 - greater than 85 percent for the FL7732 in non-dimming applications - allows these devices to meet worldwide energy saving regulations.

Price: US $ in 1,000 quantity pieces

FL7730: $1.27

FL7732: $1.15

Availability: Samples available upon request.

Delivery: 8-12 weeks ARO