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LP8545 데이터시트(PDF) 34 Page - Texas Instruments

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부품명 LP8545
상세설명  High-Efficiency LED Backlight Driver for Notebooks
PDF  44 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LP8545 데이터시트(HTML) 34 Page - Texas Instruments

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LP8545
SNVS635D – APRIL 2010 – REVISED DECEMBER 2013
www.ti.com
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
7
6
5
4
3
2
1
0
ADAPTIVE_SPEED[1:0]
ADV_SLO
EN_EXT_FET
EN_ADAPT
EN_BOOST
BOOST_IMAX[1:0]
PE
Name
Bit
Access
Description
ADAPTIVE
7
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
6
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
5
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
4
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
3
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
2
R/W
Enable boost converter
0 = boost is disabled
1 = boost is enabled and will turn on automatically when backlight is enabled
34
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Product Folder Links: LP8545



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