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Fairchild Semiconductor Introduces Low-Power LED Drivers with MOSFET Technology

Fairchild Semiconductor, an innovator of MOSFET technology, continues to deliver the latest LED lamp drivers following the addition of an optimized low-power offering to its extensive LED lighting driver solutions product line.

Along with integrated MOSFET and power factor correction (PFC), the FLS3217, FLS0116, and FLS3247 have been optimized to support low-power LED applications. These devices have been supplemented with the integrated power MOSFET to enable the reduction of board space and overall component count with minimal design time. Furthermore, these devices have been complemented with cycle-by-cycle current limiting and integrated protection features including under-voltage lockout (UVLO) and over temperature protection (OTP) to have a more reliable LED lamp system.

Based on an “adopted digital” technique, the FLS0116 performs its operation. This novel technique facilitates enabling and disabling PFC functions, automatic detection of AC and DC input voltage conditions, and also provides analog dimming, programmable oscillation frequency operation, and soft-start functions. Isolated flyback converter and non-isolated DC-DC converter applications can be facilitated through the FLS3217 and FLS3247 with primary-side regulation (PSR). Based on an accurate constant-current control (CC) function, the devices control precise output current, besides enabling simpler design with linear frequency control.

Integrated components are packed within a single IC, enabling Fairchild to incorporate novel technologies to power ranges of 1W and beyond. Using these LED IC-based products, designers can obtain low total harmonic distortion and high power factor that ensures compliance with global energy regulations.

The FLS0116 consumes low operating current of 0.85 mAa (typical), and features analog dimming function, incorporated MOSFET (1A/550V), digital PFC function >0.9, integrated HV supplying circuit supporting self biasing, and programmable LED current and frequency, current-sense pin open protection. Automatic, convertible AC-DC and DC-DC Inputs are included. Minimal component counts can be achieved without using transformer or electrolytic capacitor.

FLS3217/FLS3247 features 5 mA typical low operating current, incorporated MOSFET (FLS3217:1A/700V or FLS3247:4A/700V), high PF >0.9, tight CC tolerance <±5% in system, low Class C THD, open/short LED protection, and reduced component counts without requiring input electrolytic capacitor.

These devices can be integrated with the FL7730 and FL7732 LED drivers for analog dimming and non-dimming, and TRIAC applications.


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G.P. Thomas

Written by

G.P. Thomas

Gary graduated from the University of Manchester with a first-class honours degree in Geochemistry and a Masters in Earth Sciences. After working in the Australian mining industry, Gary decided to hang up his geology boots and turn his hand to writing. When he isn't developing topical and informative content, Gary can usually be found playing his beloved guitar, or watching Aston Villa FC snatch defeat from the jaws of victory.


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