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Fairchild to demo broad range of LED drivers at LpS 2012

Technology News |
By eeNews Europe

At the 2nd International LED professional Symposium + Expo (LpS 2012), 25-27 September, 2012, in Bregenz, Austria, Fairchild Semiconductor announced to showcase low-, mid-, and high-power LED driver applications.

Demonstrations will include Fairchild’s highly integrated PFC and PWM controllers that allow designers to reduce bill-of-material (BOM) count, enable smaller lamp sizes, eliminate design complexity and improve overall lighting efficiency.

Fairchild experts will be focused on LED driver applications in booth C11 with demos including:

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 designs. 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 percent light output.

The FL7701 smart non-isolated buck LED driver with PFC uses a digital technique that allows it to automatically detect the AC input voltage condition, allowing it to create a special internal reference signal that results in high power factor correction. The device will also work from a DC input voltage condition, automatically sensing AC versus DC input voltage conditions. The traditional technique of using a transformer in an MR application incurs additional losses with the transformer conversion; this traditional inefficient method can now be replaced using the FL7701 connected directly to a DC or AC off-line input.

The FLS0116, FLS3217 and FLS3247 with integrated MOSFET and PFC are optimally designed for low-power LED applications. With the addition of the integrated power MOSFET, these devices help to minimize board space and overall component count while decreasing design time. Equipped with cycle-by-cycle current limiting and integrated protection features such as over temperature protection (OTP) and under-voltage lockout (UVLO) these devices help to significantly improve LED lamp system reliability.

Other solutions include:

PSR flyback solutions for LED lighting applications that are <20W: In these designs, small lamp size is critical and cost pressure is high. To address this, Fairchild’s PSR technology provides TRUECURRENT technology and distinct IP for leading-edge CV/CC performance in a multi-chip package option (7SOP/DIP) with the MOSFET included (1A/700V VDMOS ).

Fairchild’s single-stage PFC flyback for 20~50W applications: These lighting applications require high power factor in a limited space, plus higher efficiency and reliability than traditional solutions provide. Fairchild provides a CRM PFC PWM controller for single-stage flyback, ideal for 10~50W LED down lights and 20~50W LED L-lights, that provide high efficiency by offering high power factor and low THD performance without adding components thus lowering the BOM count. Additionally, no bulk capacitor is needed, which further extends the system lifetime.

PFC + QR Flyback Technology for <100W applications: Designers are faced with standard solutions that result in high BOM counts, high cost and low system efficiency. To address this, Fairchild provides a QR flyback solution that provides high system efficiency and high reliability, and with the CRM PFC front-end resulting in high power factor and low THD.

LLC half-bridge solutions for <400W: These applications routinely have high BOM counts, high cost and low system efficiency and reliability, as well as design complexity. To address these application challenges, Fairchild’s LLC half-bridge solution is an integrated solution with three chips in one package. The solution features internal MOSFETs with fast recovery body diode (trr=120ns), with the high-side gate driver included. The solution offers up to 300kHz operating frequency and pulse skipping for frequency limiting under light-load conditions.

For more information on other Fairchild events please visit https://www.fairchildsemi.com/tradeshow/.


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