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IC Circuit Adapts LED Lights to Triac-Based Dimmers
(Power Electronics Technology Via Acquire Media NewsEdge) Fairchild Semiconductor introduced the FL7730 single-stage
primary side regulation (PSR) controller with power factor
correction (PFC) for triac and analog dimming compatibility. The
FL7730 circuit is an active PFC controller for single-stage flyback
topology application. The device supports both triac and analog
dimming. The device can achieve triac dimming control without
flicker over the full range of 0 to 100% light output. The FL7730
combines 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, therefore allowing
for a more compact, longer life, and lower system cost design.
There is also an FL7732 for non-dimming applications.
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.
Power factor is ~0.9 with low total harmonic distortion (THD)
(Class C). Power efficiency is up to 85 percent for the FL7730 and
over 85 percent for the FL7732 in non-dimming applications. These
characteristics allow these ICs to meet worldwide energy saving
regulations.
1,000 quantity pieces:
FL7730:
$1.27 FL7732: $1.15 Availability: Samples available upon request.Delivery: 8-12 weeks AROFairchild
Semiconductor Part Number: FL7730/2
© 2012 Penton Media
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