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LP8550TLX/NOPB 数据表(PDF) 32 Page - Texas Instruments

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部件名 LP8550TLX/NOPB
功能描述  LP8550 High-Efficiency LED Backlight Driver for Notebooks
PDF  49 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LP8550TLX/NOPB 数据表(HTML) 32 Page - Texas Instruments

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LP8550
SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014
www.ti.com
8.6.2.4 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 start-up.
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 start-up voltage is reached the boost converter adapts
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 turns on automatically when backlight is enabled
BOOST_IMAX
1
R/W
Boost converter inductor maximum current
0 = 1.4 A
1 = 2.5 A (recommended)
I_SLOPE[1]
0
R/W
8.6.2.5 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
UVLO
7:6
R/W
00 = Disabled
01 = 2.7 V
10 = 5.4 V
11 = 8.1 V
EN_PSPWM
5
R/W
Enable phase shift PWM scheme
0 = PSPWM disabled, normal PWM mode used
1 = PSPWM enabled
32
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Copyright © 2010–2014, Texas Instruments Incorporated
Product Folder Links: LP8550



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