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LP8555 датащи(PDF) 45 Page - Texas Instruments

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номер детали LP8555
подробное описание детали  LP8555 High-Efficiency LED Backlight Driver for Tablet PCs
PDF  64 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LP8555 датащи(HTML) 45 Page - Texas Instruments

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LP8555
www.ti.com
SNVS857 – FEBRUARY 2014
8.5.23 JUMP
Address: 0x7A
D7
D6
D5
D4
D3
D2
D1
D0
JEN
RESERVED
JTHR
JVOLT
Bits
Field
Type
Description
7
JEN
R/W
Enable boost voltage jumping on large brightness percentage increases.
6:4
RESERVED
R/W
Jump brightness percentage threshold.
00 = 6.25%
3:2
JTHR
R/W
01 = 12.5%
10 = 25%
11 = 50%
Typical Boost voltage jump size (10.26 mV/step)
00 = 195 steps (2 V)
1:0
JVOLT
R/W
01 = 390 steps (4 V)
10 = 585 steps (6 V)
11 = 780 steps (8 V)
The jump feature operates outside of the normal adaptive headroom loop. Whenever the brightness percentage
instantaneously increases above the configured threshold the boost voltage is instructed to immediately jump up.
This can be used in some rare cases where extremely fast boost reaction time to brightness changes is needed.
The JTHR field configures the threshold and the JVOLT field configures the voltage increase. The requested
boost voltage will never exceed the value set by the VOLTAGE.VMAX field.
Copyright © 2014, Texas Instruments Incorporated
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