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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.
www.st.com
Schematic diagram STEVAL-ILL045V1
2/4 Doc ID 023390 Rev 1
1 Schematic diagram
Figure 1. Schematic diagram
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STEVAL-ILL045V1 Revision history
Doc ID 023390 Rev 1 3/4
2 Revision history
Table 1. Document revision history
Date Revision Changes
29-Jun-2012 1Initial release.
STEVAL-ILL045V1
4/4 Doc ID 023390 Rev 1
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