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LP85571 датащи(PDF) 15 Page - Texas Instruments

номер детали LP85571
подробное описание детали  LP8557 High-Efficiency LED Backlight Driver For Tablets
PDF  49 Pages
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производитель  TI2 [Texas Instruments]
домашняя страница  https://www.ti.com
Logo TI2 - Texas Instruments

LP85571 датащи(HTML) 15 Page - Texas Instruments

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background image
PWM
Detector
Curve
Shaper
Hybrid
PWM&I
Dimming
PWM
Gen
PWM
Input
CURRENT
PWM
MAXCURR
THRESHOLD
Brightness
I
2C
Input
PWM
Detector
Curve
Shaper
Hybrid
PWM&I
Dimming
PWM
Gen
PWM
Input
CURRENT
PWM
MAXCURR
THRESHOLD
Brightness
I
2C
Input
LP8557, LP85571
www.ti.com
SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015
Feature Description (continued)
Figure 26. Brightness Data Path for BRTMODE = 10b
8.3.2.5 BRTMODE = 11b
With BRTMODE = 11b, the LED output current is controlled by the PWM input duty cycle and the BRTHI/BRTLO
registers. The PWM detector block measures the duty cycle at the PWM pin and uses it to generate PWM-based
brightness code. In this mode, the BRTHI/BRTLO registers-based brightness code goes through the curve
shaper block before it is multiplied with the PWM input duty cycle-based brightness code. After the multiplication,
the resulting code goes into the hybrid PWM & I dimming block which determines the range of the PWM and
Current control. The outcome of the hybrid PWM & I dimming block is current and/or up to 6 PWM output
signals.
Figure 27. Brightness Data Path for BRTMODE = 11b
Copyright © 2013–2015, Texas Instruments Incorporated
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Product Folder Links: LP8557 LP85571



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