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LP85571 датащи(PDF) 18 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) 18 Page - Texas Instruments

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Brightness (PWM)
Time
Slope Time
Advanced slope
Brightness (PWM)
Sloper Input
PWM Output
Time
Normal slope
LED1
LED2
LED3
LED4
LED5
LED6
60 degrees
Phase Delay
1/(fPWM)
Cycle Time
LP8557, LP85571
SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015
www.ti.com
Feature Description (continued)
Figure 30. Phase Shift PWM Dimming Scheme Diagram
8.3.3 Slope and Advanced Slope
The transition time between two brightness values can be programmed with the STEP bits from 0 to 200 ms. The
same slope time is used for sloping up and down. With advanced slope the brightness changes can be made
more pleasing to a human eye. It is implemented with a digital smoothing filter. The filter strength is set with
SMOOTH bits.
Figure 31. Slope and Advanced Slope
8.3.4 LED String Count Auto Detection
The LP8557 and LP8557I can auto-detect the number of the LED strings attached. During the auto-detect
routine, the devices automatically remove the unused current sink(s) and adjust the phasing of the remaining
current sinks. The LED OPEN* fault condition is not supported with auto-detect function enabled. On the
LP8557I, the user may disable the function by setting CONFIG.AUTO bit to 0 via an I2C write.
18
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Copyright © 2013–2015, Texas Instruments Incorporated
Product Folder Links: LP8557 LP85571



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