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LP8555 Datasheet(PDF) 9 Page - Texas Instruments

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Part # LP8555
Description  LP8555 High-Efficiency LED Backlight Driver for Tablet PCs
PDF  64 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8555 Datasheet(HTML) 9 Page - Texas Instruments

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70
75
80
85
90
95
0
50
100
150
200
250
300
Total Load (mA)
VIN = 3.0 V
VIN = 3.7 V
VIN = 4.2 V
VIN = 5.4 V
VIN = 7.4 V
VIN = 8.4 V
C011
Inductor: FDSD0415-H-4R7M
70
72
74
76
78
80
82
84
86
88
90
0
20
40
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100
Brightness (%)
VIN = 3.0 V
VIN = 3.7 V
VIN = 4.2 V
VIN = 5.4 V
VIN = 7.4 V
VIN = 8.4 V
C012
Inductor: FDSD0415-H-4R7M
70
75
80
85
90
95
0
50
100
150
200
250
300
Total Load (mA)
VIN = 3.0 V
VIN = 3.7 V
VIN = 4.2 V
VIN = 5.4 V
VIN = 7.4 V
VIN = 8.4 V
C009
Inductor: FDSD0415-H-4R7M
70
72
74
76
78
80
82
84
86
88
90
0
20
40
60
80
100
Brightness (%)
VIN = 3.0 V
VIN = 3.7 V
VIN = 4.2 V
VIN = 5.4 V
VIN = 7.4 V
VIN = 8.4 V
C010
Inductor: FDSD0415-H-4R7M
70
75
80
85
90
95
0
50
100
150
200
250
300
Total Load (mA)
VIN = 3.0 V
VIN = 3.7 V
VIN = 4.2 V
VIN = 5.4 V
VIN = 7.4 V
VIN = 8.4 V
C007
Inductor: IHLP2525CZER6R8M01
70
75
80
85
90
95
0
20
40
60
80
100
Brightness (%)
VIN = 3.0 V
VIN = 3.7 V
VIN = 4.2 V
VIN = 5.4 V
VIN = 7.4 V
VIN = 8.4 V
C008
Inductor: IHLP2525CZER6R8M01
LP8555
www.ti.com
SNVS857 – FEBRUARY 2014
Typical Characteristics (continued)
Measured at room temperature unless otherwise noted. Maximum LED current set to 23 mA per string. DC-DC Efficiency is
defined as POUT/PIN, where POUT is total output power measured from boost output(s). LED Drive Efficiency is defined as
PLED/PIN , where PLED is actual power consumed in LEDs.
L = 6.8 µH
12 x 7 LEDs
+85°C
L = 6.8 µH
12 x 7 LEDs
+85°C
Figure 8. Boost Efficiency
Figure 9. LED Drive Efficiency
L = 4.7 µH
12 x 6 LEDs
+25°C
L = 4.7 µH
12 x 6 LEDs
+25°C
Figure 10. Boost Efficiency
Figure 11. LED Drive Efficiency
L = 4.7 µH
12 x 7 LEDs
+25°C
L = 4.7 µH
12 x 7 LEDs
+25°C
Figure 12. Boost Efficiency
Figure 13. LED Drive Efficiency
Copyright © 2014, Texas Instruments Incorporated
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