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June 2012 Doc ID 023390 Rev 1 1/4
4
STEVAL-ILL045V1
9 W, A19 format Triac dimmable, high power factor, non-isolated
LED driver based on the HVLED815PF (for US market)
Data brief
Features
■ 9 W output, for light equal to a range from 40 W
to 60 W incandescent
■ +/-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
■ Dimmable with common Triac dimmer
■ RoHS compliant
Description
The STEVAL-ILL045V1 demonstration board
showcases ST’s new LED driver chip,
HVLED815PF. 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 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 the 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
it is dimmable with standard Triac-based dimmers.
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