New LinkSwitch-PH 7.4-W LED driver reference design delivers better than +/- 2% CC accuracy

Date Announced: 18 Apr 2012

PI's new LED reference design (DER-296) describes a non-isolated, TRIAC dimmable LED driver with a power factor greater than 0.9. The design is optimized for a nominal LED string voltage of 66 V at 110 mA and uses high-line 176 VAC to 265 VAC input range. The LED driver utilizes the LNK403EG from the LinkSwitch-PH family of ICs and easily fits inside an A19 form factor.

Key features and benefits include:
•TRIAC dimmer compatible
o>1000:1 dimming range (TRIAC dependent)
oClean monotonic start-up – no output blinking
oFast start-up (<300 ms) – no perceptible delay

•Low cost, low component count and small footprint solution
oNon-isolated approach simplifies transformer construction; removes bias winding
oExcellent output regulation, <1% typical
oFrequency jitter means smaller, lower cost EMI filter

The topology used is a single-stage non-isolated flyback that meets the stringent space requirements for this design. Enhanced line and load output current regulation requirements are achieved by using a sensing resistance and shunt regulator.

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