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LP85571 データシート(PDF) 31 Page - Texas Instruments

部品番号 LP85571
部品情報  LP8557 High-Efficiency LED Backlight Driver For Tablets
PDF  49 Pages
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メーカー  TI2 [Texas Instruments]
ホームページ  https://www.ti.com
Logo TI2 - Texas Instruments

LP85571 データシート(HTML) 31 Page - Texas Instruments

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LP8557, LP85571
www.ti.com
SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 Designing With LP8557
The LP8557 is intended for applications without an I2C master. It can be fully controlled with an external PWM
signal. Boost switching frequency, boost compensation, PWM dimming frequency, and the maximum LED
current can be set with external resistors.
9.1.1.1 Setting Boost Switching and PWM Dimming Frequencies
Boost switching frequency and PWM dimming frequency are set by connecting a resistor from the FSET pin to
GND. Available options are shown in Table 2.
Table 2. Setting Boost Switching and PWM Dimming Frequencies With an
External Resistor
RFSET [
Ω] (TOLERANCE)
ƒSW (kHz)
ƒPWM (kHz)
470k - 1M (±5%)
500
4.9
300k, 330k (±5%)
500
9.8
200k (±5%)
500
14.6
147k, 150k, 154k, 158k (±1%)
500
19.5
121k (±1%)
500
24.4
100k (±1%)
500
29.3
86.6k (±1%)
500
34.2
75.0k (±1%)
500
39.1
63.4k (±1%)
1000
4.9
52.3k, 53.6k (±1%)
1000
9.8
44.2k, 45.3k (±1%)
1000
14.6
39.2k (±1%)
1000
19.5
34.0k (±1%)
1000
24.4
30.1k (±1%)
1000
29.3
26.1k (±1%)
1000
34.2
23.2k (±1%)
1000
39.1
0 (grounded)
500
9.8
Copyright © 2013–2015, Texas Instruments Incorporated
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Product Folder Links: LP8557 LP85571



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