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LP8556 датащи(PDF) 16 Page - Texas Instruments

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номер детали LP8556
подробное описание детали  High-Efficiency LED Backlight Driver for Tablets
PDF  63 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LP8556 датащи(HTML) 16 Page - Texas Instruments

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LP8556
SNVS871I – JULY 2012 – REVISED MARCH 2016
www.ti.com
Product Folder Links: LP8556
Submit Documentation Feedback
Copyright © 2012–2016, Texas Instruments Incorporated
8.3.2.3 BRT_MODE = 10
With BRT_MODE = 10, the PWM output is controlled only by the Brightness register. From BRT[7:0] register, the
data goes through the PWM Curve Shaper block. Then, the data goes into the Adaptive Dimming function which
determines the range of the PWM and Current control as described in Output Dimming Schemes. The outcome
of the Adaptive Dimming function is 12-bit Current and / or up to 6 PWM output signals. The current is then
passed through the non-linear compensation block while the output PWM signals are channeled through the
Dither block.
8.3.2.4 BRT_MODE = 11
With BRT_MODE = 11, the PWM control signal path is similar to the path when BRT_MODE = 01 except that the
PWM input signal is multiplied with BRT[7:0] data after the Curve-Shaper block.
Table 2. Brightness Control Methods Truth Table
PWM_DIRECT
BRT_MODE [1:0]
BRIGHTNESS CONTROL SOURCE
OUTPUT ILED FORM
0
00
External PWM signal
Adaptive. See Output
Dimming Schemes
0
01
External PWM signal and Brightness Register
(multiplied before Curve Shaper)
0
10
Brightness Register
0
11
External PWM signal and Brightness Register
(multiplied after Curve Shaper)
1
don't care
External PWM signal
Same as the external
PWM input



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