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LP8557 Datasheet(PDF) 34 Page - Texas Instruments

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Part # LP8557
Description  High-Efficiency LED Backlight Driver For Tablets
PDF  49 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8557 Datasheet(HTML) 34 Page - Texas Instruments

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VIN
LP8557
FB
SW
1.1 ” VOUT / VIN ” 11
L1
D1
VDD
CIN
COU
T
LED1
LED2
LED3
LED4
LED5
LED6
GNDs
ISET
FSET
2.7 V ± 5.5 V
7 V ± 28 V
PWM
PWM
VOUT
RFSET
RISET
LP8557, LP85571
SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015
www.ti.com
Table 9. Available Full-Scale LED Currents
MAXCURR
ILED [mA]
000
5
001
10
010
13
011
15
100
18
101
20
110
23
111
25
9.2 Typical Applications
9.2.1 LP8557 PWM-Only Option
Figure 38. LP8557 PWM-Only Device Option
9.2.1.1 Design Requirements
Table 10. Recommended Inductance
MIN
TYP
MAX
UNIT
ƒsw = 1 MHz
3.29
4.7 - 10
µH
ƒsw = 500 kHz
7
10 - 22
Table 11. Recommended Output Capacitance(1)
MIN
TYP
MAX
UNIT
ƒsw = 1 MHz
2
µF
ƒsw = 500 kHz
2
(1)
The recommended output capacitance is the de-rated capacitance.
34
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Copyright © 2013–2015, Texas Instruments Incorporated
Product Folder Links: LP8557 LP85571



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