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LP8556 数据表(PDF) 47 Page - Texas Instruments

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部件名 LP8556
功能描述  High-Efficiency LED Backlight Driver for Tablets
PDF  63 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LP8556 数据表(HTML) 47 Page - Texas Instruments

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VIN
LP8556
MCU
VBOOST
SW
1.1 ” 9OUT / VIN ” 15
L1
D1
VDD
CIN
COUT
LED1
LED2
LED3
LED4
LED5
LED6
GNDs
PWM
SDA
SCL
ISET
FSET
VLDO
CVLDO
RFSET
RISET
2.7V - 36V
7V ± 43V
EN / VDDIO
EN / VDDIO
1.62V ± 3.6V
VDD
2.7V ± 20V
VOUT
Optional
CVDD
47
LP8556
www.ti.com
SNVS871I – JULY 2012 – REVISED MARCH 2016
Product Folder Links: LP8556
Submit Documentation Feedback
Copyright © 2012–2016, Texas Instruments Incorporated
9.1.2.2 Setting Full-Scale LED Current
The LED current per output is configured by ISET resistor when ISET_EN=1. In this mode the CURRENT_IMAX
and CURRENT registers can also further scale the LED current. Available options are shown in Table 15.
Table 15. Setting Full-Scale LED Current with ISET Resistor
RISET [
Ω]
ISET_EN
CURRENT_MAX
CURRENT[11:0]
FULL-SCALE ILED [mA]
24 k
1
0
FFFh
5
24 k
1
1
FFFh
10
24 k
1
10
FFFh
15
24 k
1
11
FFFh
20
24 k
1
100
FFFh
23
24 k
1
101
FFFh
25
24 k
1
110
FFFh
30
24 k
1
111
FFFh
50
12 k – 100 k
1
000–111
001h–FFFh
(CURRENT/4095) × IMAX × 20,000 × 1.2 V / RISET
9.2 Typical Application
Figure 19. LP8556 Typical Application Schematic



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