Date: 21/10/2011

Smart non-isolated buck LED driver IC with PFC

Fairchild Semiconductor has developed the FL7701 Smart Non-isolated Buck LED Driver with power factor correction (PFC). The device 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 FL7701 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, as per Fairchild.

According to Fairchild, the FL7701 provides designers up to 20 percent lower bill of material (BOM) costs and up to 60 percent board space savings for PCB sizes found in LED lighting applications and supports analog dimming.

Fairchild says that due to its high reliability in the FL7701 increase the luminary lifespan to more than five years, compared to the three years achievable by current solutions and no electrolytic capacitors for the input, output, or the FL7701 VDD supply are required. Fairchild also says Digital power factor (PF) realization (>0.9) and lower total harmonic distortion (THD), along with the 90% electrical efficiency results in energy savings for the residential applications.

Available in an SOP-8 package, the FL7701 is suitable for interior decorating/ornamental lights; LED light bulbs or down lights in PAR, Reflector, MR or classic styles E26/E27 or Bi-Pin base, as well as LED lamps for low power lighting fixtures.

Price: US $1.27 in 1K quantity pieces
Availability: Now in samples
For more information visit: www.fairchildsemi.com