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LP8556 датащи(PDF) 22 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) 22 Page - Texas Instruments

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LED1
LED2
LED3
LED4
LED5
72 degrees
Phase Delay
1/(fPWM)
Cycle Time
1
2
3
4
5
6
VBOOST
LED1
LED2
LED3
LED4
LED5
LED6
60 degrees
Phase Delay
1/(fPWM)
Cycle Time
1
2
3
4
5
6
VBOOST
22
LP8556
SNVS871I – JULY 2012 – REVISED MARCH 2016
www.ti.com
Product Folder Links: LP8556
Submit Documentation Feedback
Copyright © 2012–2016, Texas Instruments Incorporated
8.3.2.8 Phase Shift PWM Scheme
Phase shift PWM scheme allows delaying the time when each LED driver is active. When the LED drivers are
not activated simultaneously, the peak load current from the boost output is greatly decreased. This reduces the
ripple seen on the boost output and allows smaller output capacitors. Reduced ripple also reduces the output
ceramic capacitor audible ringing. PSPWM scheme also increases the load frequency seen on the boost output
six times and therefore transfers the possible audible noise to the frequencies outside of the audible range.
Description of the PSPWM mode is seen inTable 6. PSPWM mode is set with <PS_MODE[2:0]> bits.
Table 6. LED String Configuration
PS_MODE[2:0]
WAVEFORMS
CONNECTION
000
6 LED strings with 60 degree phase shift. One driver for each LED string.
001
5 LED strings with 72 degree phase shift. One driver for each LED string.
(Driver #6 not used).



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