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PDF ISL1903 Data sheet ( Hoja de datos )

Número de pieza ISL1903
Descripción Dimmable Buck LED Driver
Fabricantes Intersil 
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No Preview Available ! ISL1903 Hoja de datos, Descripción, Manual

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)
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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/

1 page




ISL1903 pdf
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





ISL1903 arduino
ISL1903
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram -
ISL1903” on page 2 and “Typical Application schematics” beginning on page 3. VDD = 17V, RRAMP = 54kΩ, CRAMP = 470pF, TA = -40°C to
+125°C, Typical values are at TA = +25°C; Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 7)
TYP
(Note 7)
UNITS
Unbiased Output Voltage Clamp
Frequency
VDD = 6V, ILOAD = 3mA
- - 1.9
291 320 349
V
Hz
Maximum Duty Cycle
REFIN = 0.5V
- - 100 %
Minimum On-Time
REFIN = 0V
- - 0.5 μs
OVP
OVP Threshold
1.46
1.50
1.54
V
OVP Hysteresis
10 20 27 μA
Input Bias Current
-1.0 - 1.0 μA
OVP Clamp Voltage
THERMAL PROTECTION
IOVP = 1mA
5.4 - 7.0 V
Thermal Shutdown
(Note 8)
150 160 170
°C
Hysteresis
(Note 8)
- 25 - °C
NOTES:
7. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
8. Limits established by characterization and are not production tested.
Test Waveforms and Circuits
8V
1 VDD
OUT 16
2 OFFREF PWMOUT 15
3 VREF
DHC 14 0 TO 1V 120Hz
4 IOUT
GND 13
ISL1903
5 CS+
AC 12
6 OC
OVP 11
1nF 2.2nF
7 FB
RAMP 10
8 DELADJ VERR 9
5k 470pF
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OUT
OR
PWMOUT
tR
90%
10%
tF
54k
FIGURE 2. RISE/FALL TIME TEST CIRCUIT
FIGURE 3. RISE/FALL TIMES
11
FN8285.0
August 10, 2012
Datasheet pdf - http://www.DataSheet4U.co.kr/

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