LP8545 datasheet(34/44 Pages) TI1

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LP8545

SNVS635D – APRIL 2010 – REVISED DECEMBER 2013

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EEPROM ADDRESS 1 register

TEMP_LIM

4:3

R/W

Thermal deration function temperature threshold

00 = thermal deration function disabled

01 = 110°C

10 = 120°C

11 = 130°C

SLOPE

2:0

R/W

Slope time for brightness change

000 = Slope function disabled, immediate brightness change

001 = 50 ms

010 = 75 ms

011 = 100 ms

100 = 150 ms

101 = 200 ms

110 = 300 ms

111 = 500 ms

EEPROM Address 2

Address A2h

EEPROM ADDRESS 2 register

ADAPTIVE_SPEED[1:0]

ADV_SLO

EN_EXT_FET

EN_ADAPT

EN_BOOST

BOOST_IMAX[1:0]

Name

Bit

Access

Description

ADAPTIVE

R/W

Boost converter adaptive control speed adjustment

SPEED[1]

0 = Normal mode

1 = Adaptive mode optimized for light loads. Activating this helps the voltage droop

with light loads during boost / backlight startup.

ADAPTIVE

R/W

Boost converter adaptive control speed adjustment

SPEED[0]

0 = Adjust boost once for each phase shift cycle or normal PWM cycle

1 = Adjust boost every 16th phase shift cycle or normal PWM cycle

ADV_SLOPE

R/W

Advanced slope

0 = Advanced slope is disabled

1 = Use advanced slope for brightness change to make brightness changes

smooth for eye

EN_EXT_FET

R/W

Enable external FET gate driver

0 = Internal FET used

1 = External FET used and GD pin used for driving the external FET gate

EN_ADAPT

R/W

Enable boost converter adaptive mode

0 = adaptive mode disabled, boost converter output voltage is set with VBOOST

EEPROM register bits

1 = adaptive mode enabled. Boost converter startup voltage is set with VBOOST

EEPROM register bits, and after startup voltage is reached the boost converter will

adapt to the highest LED string VF. LED driver output headroom is set with

DRV_HEADR EEPROM control bits.

EN_BOOST

R/W

Enable boost converter

0 = boost is disabled

1 = boost is enabled and will turn on automatically when backlight is enabled

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