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LP85571 데이터시트(PDF) 17 Page - Texas Instruments

부품명 LP85571
상세설명  LP8557 High-Efficiency LED Backlight Driver For Tablets
PDF  49 Pages
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제조업체  TI2 [Texas Instruments]
홈페이지  https://www.ti.com
Logo TI2 - Texas Instruments

LP85571 데이터시트(HTML) 17 Page - Texas Instruments

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PWM CONTROL
CURRENT CONTROL
25%
100%
25%
50%
100%
25%
50%
100%
PWM CONTROL
HYBRID PWM & CURRENT CONTROL
BRIGHTNESS
BRIGHTNESS
100%
50%
25%
100%
25%
50%
100%
PURE CURRENT CONTROL
BRIGHTNESS
50%
LP8557, LP85571
www.ti.com
SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015
Feature Description (continued)
Figure 29. Dimming Methods
8.3.2.7 Phase Shift PWM Scheme
The phase shift PWM (PSPWM) scheme allows delay of the time when each LED current sink is active. When
the LED current sinks 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 to be used.
Reduced ripple also reduces the output ceramic capacitor audible ringing. The PSPWM scheme also increases
the load frequency seen on the boost output by up to six times, therefore transferring the possible audible noise
to the frequencies outside the audible range.
The phase difference between each active driver is automatically determined as 360°/number of active drivers.
Copyright © 2013–2015, Texas Instruments Incorporated
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