LP8555 datasheet(45/64 Pages) TI1

Il numero della parte	LP8555

Spiegazioni elettronici	LP8555 High-Efficiency LED Backlight Driver for Tablet PCs

PDF	64 Pages

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Produttore elettronici	TI1 [Texas Instruments]

Homepage	http://www.ti.com

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LP8555

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SNVS857 – FEBRUARY 2014

8.5.23 JUMP

Address: 0x7A

JEN

RESERVED

JTHR

JVOLT

Bits

Field

Type

Description

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.

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