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LP8555 Datasheet(PDF) 10 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) 10 Page - Texas Instruments

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60
0.0
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1.0
Headroom Voltage (V)
5 mA
10 mA
15 mA
20 mA
23 mA
25 mA
30 mA
50 mA
C017
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Headroom Voltage (V)
5 mA
10 mA
15 mA
20 mA
23 mA
25 mA
30 mA
50 mA
C018
±20
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Frequency (Hz)
Phase
Gain
C015
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1.0
Headroom Voltage (V)
5 mA
10 mA
15 mA
20 mA
23 mA
25 mA
30 mA
50 mA
C016
0.0
0.5
1.0
1.5
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2.5
3.0
3.5
4.0
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Brightness (%)
+25 °C
±40 ƒC
+85 °C
C013
Inductor: IHLP2525CZER6R8
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8
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Brightness (%)
+25 °C
±40 ƒC
+85 °C
C014
Inductor: IHLP2525CZER6R8
LP8555
SNVS857 – FEBRUARY 2014
www.ti.com
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.
VDD = 3.7 V
12 x 7 LEDs
VDD = 3.7 V
12 x 7 LEDs
Figure 14. LED Current Mismatch
Figure 15. VDD Current vs. Load
L = 4.7 µH
VDD = 3.7V
VBOOST = 23 V
+25°C
VDD = 3.7 V
IOUT = 138 mA/boost
Figure 17. LED Current Vs. Headroom Voltage
Figure 16. Typical Boost Converter Gain and Phase Plot
-40°C
VDD = 3.7 V
+85°C
VDD = 3.7 V
Figure 18. LED Current Vs. Headroom Voltage
Figure 19. LED Current Vs. Headroom Voltage
10
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Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: LP8555



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