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ISL1903 Fiches technique(PDF) 1 Page - Renesas Technology Corp

No de pièce ISL1903
Description  Dimmable Buck LED Driver - AC Mains or DC Input LED Driver
Download  19 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL1903 Fiches technique(HTML) 1 Page - Renesas Technology Corp

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FN8285 Rev 1.00
Page 1 of 19
September 20, 2012
FN8285
Rev 1.00
September 20, 2012
ISL1903
Dimmable Buck LED Driver - AC Mains or DC Input LED Driver
DATASHEET
The ISL1903 is a high-performance, critical conduction mode
(CrCM), single-ended buck LED driver controller. It may be used
with DC input converters, but also supports single-stage
conversion of the AC mains to a constant current source with
power factor correction (PFC). The ISL1903 supports buck
converter topologies, such as isolated forward converters or
non-isolated source return buck converters. Operation in CrCM
allows near zero-voltage switching (ZVS) for improved
efficiency while maximizing magnetic core utilization.
The ISL1903 is compatible with both leading and trailing edge
modulated AC mains dimmers. It provides all of the features
required for high-performance dimmable LED ballast designs.
Applications
• Industrial and commercial LED lighting
• Retrofit LED lamps with triac dimming
• Universal AC mains input LED retrofit lamps
• AC or DC input LED ballasts
Features
• Excellent LED current regulation over line, load, and
temperature
• 0 - 100% dimming with leading-edge (triac) and
trailing-edge dimmers
• Power factor correction for up to 0.995 power factor and
less than 20% harmonic content
• Critical conduction mode (CrCM) operation for
quasi-resonant high efficiency performance
• Supports Universal AC Mains Input
• Configurable for PWM or DC current dimming control of
LEDs
• Monitors FET switching current for load regulation
• Supports isolated and non-isolated buck topologies
• Closed loop soft-start for no overshoot
• OFFREF feature to set dimming off-point to improve fixture
performance matching
• -40°C to +125°C operation
• Pb-free (RoHS compliant)
FIGURE 1A. BOOST-RETURN (BUCK) TOPOLOGY
FIGURE 1B. CURRENT vs AC CONDUCTION ANGLE
FIGURE 1. ISL1903 APPLICATION PERFORMANCE
12
EMI Filter
AC Mains
8
13
3
DHC
6
7
DELADJ
GND
VREF
IOUT
OUT
OC
FB
ISL1903
VDD
CS+
5
14
1
4
10
RAMP
16
9
VERR
AC
0
10
20
30
40
50
60
70
80
90
100
100
90
80
70
60
50
40
30
20
10
0
CONDUCTION ANGLE (%)
OBSOLETE PRODUCT
NO RECOMMENDED REPLACEMEN
T
contact our Technical Support Cente
r at
1-888-INTERSIL or www.intersil.com
/tsc


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