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| LM3555TLE Datasheet, PDF (8/33 Pages) Texas Instruments – LM3555 Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interface | |||
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LM3555
SNVS594E â JANUARY 2009 â REVISED NOVEMBER 2011
Typical Characteristics (continued)
Unless otherwise specified: TA = 25°C; VIN = 3.6V; CIN1= 10 µF, CIN2= 0.1 µF, COUT = 11 µF; L = 2.2 µH.
Two Series LEDs @ 400mA
Torch Current
LED Efficiency
vs
vs
Brightness Code
Input Voltage
100
2 LED
TA = -30°C
90
80
70
TA = +85°C
TA = +25°C
60
VLED (@ 400 mA) = 6.9V (2 LEDs)
50
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
60mA Torch Current
vs
Input Voltage
2 LED
0.20
0.18
TA = -30°C, +25°C, +85°C
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
VIN (V) = 3.6V, VLED (V) = 6.3V (2 LEDs)
01234567
BRCTORCH (#)
80mA Torch Current
vs
Input Voltage
2 LED
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0.080
0.075
0.070
0.065
0.060
0.055
0.050
0.045
0.040
TA = +85°C
TA = -30°C
TA = +25°C
2.5
100
VLED (V) = 6.0V (2 LEDs)
3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
Two LEDs @ 60mA
LED Efficiency
vs
Input Voltage
90
TA = -30°C
80
70
TA = +85°C
TA = +25°C
60
50
VLED (V) = 6.0V (2 LEDs)
40
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
0.100
0.095
0.090
0.085
0.080
0.075
0.070
0.065
0.060
TA = +85°C TA = +25°C
TA = -30°C
VLED (V) = 6.1V (2 LEDs)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
Two LEDs @ 80mA
LED Efficiency
vs
Input Voltage
100
TA = -30°C
90
80
70
TA = +85°C
60
TA = +25°C
50
VLED (V) = 6.1V (2 LEDs)
40
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
8
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Copyright © 2009â2011, Texas Instruments Incorporated
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