AN4130 Datasheet, PDF (1/41 Pages) STMicroelectronics – LED driver using the HVLED815PF

AN4130
Application note
STEVAL-ILL045V1: 120 V A19 dimmable high power factor 9 W
LED driver using the HVLED815PF
By Thomas Stamm
Introduction
The STEVAL-ILL045V1 demonstration board showcases ST's new HVLED815PF LED
driver chip. It solves the problem of low-cost drive circuitry for LED replacements for 40 W
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 draws
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.
Figure 1. Images top and bottom
September 2012
Doc ID 023315 Rev 1
1/41
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