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ISL1903 Datasheet PDF - Intersil

Part Number ISL1903
Description Dimmable Buck LED Driver
Manufacturers Intersil 
Logo Intersil Logo 

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ISL1903 datasheet, circuit
Dimmable Buck LED Driver - AC Mains or DC Input LED
Driver
ISL1903
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)
www.DataSheet.net/
EMI Filter
AC Mains
1
VDD
14 DHC
5
CS+
AC 12
OUT 16
ISL1903
8 DELADJ
OC 6
13 GND
VERR 9
3 VREF
RAMP
10
FB 7
IOUT
4
100
90
80
70
60
50
40
30
20
10
0
100 90 80 70 60 50 40 30 20 10
CONDUCTION ANGLE (%)
0
FIGURE 1A. BOOST-RETURN (BUCK) TOPOLOGY
FIGURE 1B. CURRENT vs AC CONDUCTION ANGLE
FIGURE 1. ISL1903 APPLICATION PERFORMANCE
August 10, 2012
FN8285.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Datasheet pdf - http://www.DataSheet4U.co.kr/

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1 page
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ISL1903 equivalent
Typical Application - Isolated Dimmable Buck LED Driver
DIMMER
AC
MAINS
EMI
FILTER
1 VDD
OUT 16
2 OFFREF PWMOUT 15
3 VREF
DHC 14
4 IOUT
GND 13
ISL1903
5 CS+
AC 12
6 OC
OVP 11
7 FB
RAMP 10
8 DELADJ
VERR 9

5 Page
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Information Total 19 Pages
Download[ ISL1903.PDF Datasheet ]

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