Specifications

APPLICATION SPOTLIGHT
8
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Dimmer-compatible LED drivers maximise feature integration and
flexibility
The NXP Semiconductors SSL210x family
comprises three LED drivers for
solid-state lighting and
incandescent-
bulb replacement
covering a wide
range of power
ratings and industry-
standard form factors.
The SSL2101 and SSL2102
are fully integrated drivers
suitable for use in lamps up
to 10W and 25W respectively. B y
integrating features such as a high-
voltage power switch, circuitry to supply a
phase-cut dimmer, and support for
direct start-up from mains voltage, these
devices minimise the number of external
components required. This makes them
suitable for use in compact lamps with
closed casings, such as GU10 and E27 units. In
NXP
Semiconductors
addition, both strong and weak bleeders are
implemented on-chip, providing the latching
and hold-current maintenance functions
necessary to ensure consistent operation of
the dimmer.
The SSL2101 has completed 8000
hours of actual testing time
at 150°C, making it the rst
driver to demonstrate lifetime
performance matching that
of an LED emitter.
The SSL2103 is suitable for
lamps at higher power
levels in industry-standard
form factors such as PAR20, PAR30
and PAR38. It is compatible with a wider
range of dimmers, and can also be used with
non-dimmable lamps. The device achieves
this enhanced exibility by providing circuitry
to control an external power switch, hence
covering a wider range of power ratings, as
well as circuitry to control external bleeder
transistors enabling extended dimmer
interoperability.
FEATURES:
 Valley-switching circuitry
 Magnetisation detection
 Over-temperature protection
 Over-current protection
 Short-winding protection
APPLICATIONS:
 SSL retrots
 LED spotlights
 LED down-lights
 LED strings
All the devices feature integrated logarithmic-
correction circuitry, which matches human-
eye response and allows deep dimming to
below 1%.
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FEATURES:
 500HzPWMoutput
 Programmable dimming range
 Smooth dimming transitions
 Low-power operation
 Short-circuit and over-voltage protection
APPLICATIONS:
 Dimmable downlights and accent lighting
 Indoor and outdoor illuminations
 Power-supply PFC circuitry
LED driver delivers compromise-free performance with phase-cut
dimmers
The National Semiconductor LM3450 high-
brightness LED driver maintains icker-
free illumination when used with a phase-
cut dimmer but, unlike most other drivers,
does not reduce the LED-dimming range
or waste power deliberately to prevent the
dimmer misring.
Conventional drivers for use with phase-cut
dimmers are able to decode the chopped
waveform to dim the LED, but do not always
meet the minimum current requirement
to prevent the dimmer from shutting o
or misring during operation. This causes
inaccurate decoding of the phase angle
resulting in icker,
particularly at very low
dimming levels. Many
drivers compensate by
reducing the dimming
range or wasting power
simply to keep the dimmer
from misring.
The LM3450 LED driver
implements hold circuitry
to adjust the current
through the phase dimmer
dynamically. In combination
with this circuitry, a
programmable, intelligent
dimming decoder ensures smooth, consistent
illumination across the full dimming range.
Working together, these innovations provide
the most ecient and uniform dimming
performance in the industry. In addition, active
power-factor correction is built in to ensure a
high power factor complying with residential
and commercial Energy Star standards in
North America and the European standard
EN61000-3-2 Class C. The device is a member
National
Semiconductor
of National’s PowerWise® energy-ecient
product family, and is optimised for use in
high-performance, phase-dimmable LED
xtures from 10W to 100W.