HVLED815PF Isolated LED Driver Demonstration Board

The STM-STEVAL-ILL044V1 demonstration board showcases ST"s new LED driver chip, the HVLED815PF. It solves the problem of low-cost drive circuitry for LED replacements for 40 to 60 Watt incandescent or equivalent compact-fluorescent lamps. The HVLED815PF is a new integrated power controller using primary-side control to achieve LED current regulation within +/-5%. (It also has primary-side voltage regulation, used here for open load protection.) The device incorporates an 800 V avalanche-rated FET and fits in a standard SO-16 package. An internal startup circuit eliminates the need for external rapid-start circuitry. The PFC-flyback power converter operates in transition mode for highest efficiency and best use of components. With the addition of a few extra components the HVLED815PF is made to draw near-sinusoidal input current from the AC line. The circuit regulates LED current over a wide range of line voltage and LED string voltage, and is dimmable with standard Triac-based dimmers. +/- 5% primary-side current regulation, no optocoupler Low component count - 25 parts, including the EMI filter Only 1 tight-tolerance component High efficiency, >86% High power factor >0.98 and low THD,<20% over 90 V to 132 V range Fits in 28 mm tubing, 52 mm overall length 9 W output, for light equal to 40-60 W incandescent Dimmable with common Triac dimmer