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LP8555 bảng dữ liệu(PDF) 41 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LP8555 High-Efficiency LED Backlight Driver for Tablet PCs
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LP8555 bảng dữ liệu(HTML) 41 Page - Texas Instruments

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LP8555
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SNVS857 – FEBRUARY 2014
8.5.13 LEDEN1
Address: 0x19
D7
D6
D5
D4
D3
D2
D1
D0
RESERVED
ENABLE[6:1]
Bits
Field
Type
Description
7:6
RESERVED
R/O
5:0
ENABLE1
R/W
LED string enables for Bank B.
The ENABLE field configures the enabled LED strings. If the CONFIG.AUTO bit is 0 these LED strings will stay
active when the backlight is on. If the CONFIG.AUTO bit is set, then an LED open/short condition will cause that
LED string to be removed. A given LED string will never be enabled if the corresponding bit of the ENABLE field
is set to 0. The OV field configures the threshold for detecting an LED overvoltage condition; which may occur
when one or more LEDs are bypassed (shorted) within an LED string.
8.5.14 VOLTAGE1
Address: 0x1A
D7
D6
D5
D4
D3
D2
D1
D0
VMAX1
ADAPT1
VINIT1
Bits
Field
Type
Description
Maximum boost voltage for Boost B (typical).
00 = 18 V
7:6
VMAX
R/W
01 = 22 V
10 = 25 V
11 = 28 V
5
ADAPT
R/W
Enable adaptive headroom optimization.
Initial boost voltage. When ADAPT is 0 the boost voltage will remain at the VINIT setting. The voltage
4:0
VINIT1
R/W
range is from 7 V to 28 V; where 0x00 equals 7 V and 0x3F equals 28 V (typical).
The VOLTAGE1.VMAX bit sets the maximum allowed boost voltage for Boost B. The boost control loop will
never request a higher voltage than the VMAX value. When the VOLTAGE.ADAPT bit is set to 1 the boost
voltage may vary from 7 V to the VMAX configured voltage.
VINIT (DEC)
VOLTAGE (V)
VINIT (DEC)
VOLTAGE (V)
VINIT (DEC)
VOLTAGE (V)
0
7.00
11
14.45
22
21.91
1
7.68
12
15.13
23
22.58
2
8.35
13
15.8
24
23.26
3
9.03
14
16.48
25
23.94
4
9.71
15
17.16
26
24.61
5
10.39
16
17.84
27
25.29
6
11.06
17
18.52
28
25.97
7
11.74
18
19.2
29
26.65
8
12.42
19
19.87
30
27.32
9
13.09
20
20.55
31
28.00
10
13.77
21
21.23
Copyright © 2014, Texas Instruments Incorporated
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