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| LM3553 Datasheet, PDF (6/26 Pages) National Semiconductor (TI) – 1.2A Dual Flash LED Driver System with I2C Compatible | |||
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LM3553
SNVS414B â FEBRUARY 2008 â REVISED MAY 2013
www.ti.com
Typical Performance Characteristics
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;.
Maximum LED Drive Current @ VIN = 3.6V
1.6
TA = -30°C and +25°C
1.2
1.2A Flash Line Regulation
1.4
VLED = 3.65V @ +25°C
1.3
TA = +25°C
TA = +85°C
0.8
1.2
0.4
VLED = 3.5V @1.2A
0.0
0
32
64
96
128
BRIGHTNESS CODE (#)
Figure 3.
1.0A Flash Line Regulation
1.1
TA = +25°C
1.1
1.0
1.0
0.9
3.0
TA = +85°C
TA = -30°C
VLED = 3.7V @ +25°C
3.5 4.0 4.5 5.0 5.5
VIN (V)
Figure 5.
Voltage Mode Load Regulation
5.50
TA = +25°
5.25
IOUT = 100 mA
I OUT = 300 mA
5.00
IOUT = 500 mA
4.75
IOUT = 700 mA
4.50
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
Figure 7.
1.1
TA = -30°C
TA = +85°C
1.0
3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
Figure 4.
Voltage Mode Line Regulation
5.250
IOUT = 500 mA
5.125
5.000
TA = +85°C
4.875
TA = -30°C TA = +25°C
4.750
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
Figure 6.
Input Current and LED Efficiency
with 1A Flash Current
2.40
90
VLED = 3.7V and ILED = 1A
2.00
IIN
80
äLED
1.60
70
1.20
60
0.80
50
2.9 3.4 3.9 4.5 5.0 5.5
VIN (V)
Figure 8.
6
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