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| LM3553 Datasheet, PDF (7/26 Pages) National Semiconductor (TI) – 1.2A Dual Flash LED Driver System with I2C Compatible | |||
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LM3553
www.ti.com
SNVS414B â FEBRUARY 2008 â REVISED MAY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified: TA = 25°C; VIN = 3.6V; VM/F = VIN; RSET = 16.5kâ¦; CIN= 10µF, COUT = 10µF;L = 2.2µH; VFB bit =
CL bit = '0'; OVP bit = '0' for 1 LED and VFB = '1' for two series LEDs;.
Input Current and LED Efficiency
with 1.2A Flash Current
Input Current and LED Efficiency
with 500mA Flash Current through 2 Series LEDs
2.80
90
1.60
90
VLED = 3.8V and ILED = 1.2A
IIN
2.20
äLED 80
1.35
80
äLED
70
1.60
60
1.00
50
3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
Figure 9.
1.10
70
IIN
0.85
2 LEDs in Series
VLED = 3.35V and ILED = 500 mA
0.60
3.0 3.5 4.0 4.5 5.0
VIN (V)
Figure 10.
60
50
5.5
Input Current and LED Efficiency
with 600mA Flash Current through 2 Series LEDs
2.20
90
Input Current
vs
VIN
1 LED @ 1.2A and 2 LEDs @ 600mA
2.8
1.85
80
1.50
äLED
70
IIN
1.15
60
2 LEDs in Series
VLED = 3.4V and ILED = 600 mA
0.80
3.0 3.5 4.0 4.5 5.0
VIN (V)
Figure 11.
50
5.5
LED Efficiency
vs
VIN
1 LED @ 1.2A and 2 LEDs @ 600mA
100
2 LEDs @ 600 mA
80
1 LED @ 1.2A
60
40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
Figure 13.
2.4
1 LED @ 1.2A
2.0
2 LEDs @ 600 mA
1.6
1.2
0.8
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
Figure 12.
Converter Efficiency
vs
VIN
100
Voltage Mode with IOUT = 500 mA
90
80
2 LEDs @ 500 mA with
70
VLED(total) = 6.725V
60
1 LED @ 1A with VLED = 3.7V
50
40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
Figure 14.
Copyright © 2008â2013, Texas Instruments Incorporated
Product Folder Links: LM3553
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