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LP8556 数据表(PDF) 48 Page - Texas Instruments

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部件名 LP8556
功能描述  High-Efficiency LED Backlight Driver for Tablets
PDF  63 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LP8556 数据表(HTML) 48 Page - Texas Instruments

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LP8556
SNVS871I – JULY 2012 – REVISED MARCH 2016
www.ti.com
Product Folder Links: LP8556
Submit Documentation Feedback
Copyright © 2012–2016, Texas Instruments Incorporated
Typical Application (continued)
9.2.1 Design Requirements
Table 16. Recommended Inductance
ƒSW
MIN
TYP
MAX
UNIT
1250
3.3
22
µH
625
6.8
68
µH
312
10
100
µH
Table 17. Recommended Output Capacitance
ƒSW
MIN
TYP
MAX
UNIT
1250
4.7
µF
625
4.7
µF
312
10
µF
9.2.2 Detailed Design Procedure
9.2.2.1 Recommended Inductance for the Boost Power Stage
Assumes 20 mA as the maximum LED current per string and 3.3 V as the maximum LED forward voltage.
NUMBER OF
LED STRINGS
NUMBER OF
LEDS PER
STRING
BOOST INPUT
VOLTAGE RANGE
L1 INDUCTANCE
ƒSW = 1250 kHz
ƒSW = 625 kHz
ƒSW = 312 kHz
6
6
2.7 V - 4.4 V
3.3
μH - 6.8 μH
6.8
μH - 15 μH
10
μH - 33 μH
5.4 V - 8.8 V
10
μH - 22 μH
22
μH - 47 μH
47
μH - 100 μH
6
8
2.7 V - 4.4 V
4.7
μH - 10 μH
10
μH - 15 μH
22
μH - 33 μH
5.4 V - 8.8 V
10
μH - 22 μH
22
μH - 68 μH
47
μH - 100 μH
4
10
5.4 V - 8.8 V
6.8
μH - 22 μH
22
μH - 47 μH
47
μH - 100 μH
4
12
5.4 V - 8.8 V
10
μH - 22 μH
22
μH - 47 μH
33
μH - 100 μH
(1)
Capacitance of Multi-Layer Ceramic Capacitors (MLCC) can change significantly with the applied DC voltage. Use capacitors with good
capacitance versus DC bias characteristics. In general, MLCC in bigger packages have lower capacitance de-rating than physically
smaller capacitors.
9.2.2.2 Recommended Capacitances for the Boost and LDO Power Stages(1)
SWITCHING FREQUENCY [kHz]
CIN [μF]
COUT [μF]
CVLDO [μF]
1250
2.2
4.7
10
625
2.2
4.7
10
312
4.7
10
10



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