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LP8553 数据表(PDF) 32 Page - Texas Instruments

部件名 LP8553
功能描述  LP8553 High-Efficiency LED Backlight Driver for Notebooks
PDF  41 Pages
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制造商  TI2 [Texas Instruments]
网页  https://www.ti.com
标志 TI2 - Texas Instruments

LP8553 数据表(HTML) 32 Page - Texas Instruments

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LP8553
SNVS701B – SEPTEMBER 2011 – REVISED JANUARY 2014
www.ti.com
EEPROM Address 2
Address A2h
EEPROM ADDRESS 2 register
7
6
5
4
3
2
1
0
ADAPTIVE_SPEED[1:0]
ADV_SLOPE
MODE_25/50_S
EN_ADAPT
EN_BOOST
BOOST_IMAX
I_SLOPE[1]
EL
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
MODE_25/50_SEL
4
R/W
25% or 50% mode selection for PWM & current control
0 = 50% mode selected
1 = 25% mode selected
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
BOOST_IMAX
1
R/W
Boost converter inductor maximum current
0 = 1.4A
1 = 2.5A (recommended)
I_SLOPE[1]
0
R/W
Current slope I_SLOPE[1:0] trim bits adjust the constant current level of the PWM
control range in the PWM & current control mode
I_SLOPE[1:0]
25% MODE
50% MODE
00
−2.5%
−1.25%
01
−5.0%
−2.50%
10
−7.5%
−3.75%
11
−10.0%
−5.00%
EEPROM Address 3
Address A3h
EEPROM ADDRESS 3 register
7
6
5
4
3
2
1
0
UVLO[1:0]
EN_PSPWM
PWM_FREQ[4:0]
Name
Bit
Access
Description
32
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Copyright © 2011–2014, Texas Instruments Incorporated
Product Folder Links: LP8553



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