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LP8556 데이터시트(PDF) 46 Page - Texas Instruments

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부품명 LP8556
상세설명  High-Efficiency LED Backlight Driver for Tablets
PDF  63 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

LP8556 데이터시트(HTML) 46 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
Table 13. Setting Full-Scale LED Current with EEPROM
ISET_EN
CURRENT_MAX
CURRENT[11:0]
FULL-SCALE ILED [mA]
0
0
FFFh
5
0
1
FFFh
10
0
10
FFFh
15
0
11
FFFh
20
0
100
FFFh
23
0
101
FFFh
25
0
110
FFFh
30
0
111
FFFh
50
0
000 – 111
001h – FFFh
(CURRENT/4095) × CURRENT_IMAX
9.1.2 Using LP8556 With Configuration Resistors and IO Pins
9.1.2.1 Setting Boost Switching and PWM Dimming Frequencies
Boost switching and PWM dimming frequencies can be set via resistor when BOOST_FSET_EN = 1 and
PWM_FSET_EN = 1. Available options are shown in Table 14.
Table 14. Configuring PWM Dimming Frequency With an External Resistor
RFSET [k
Ω]
(TOLERANCE)
ƒSW [kHz]
BOOST_FSET_EN = 1
ƒPWM [Hz] (RESOLUTION)
PWM_FSET_EN = 1
Floating or FSET pin pulled HIGH
1250
9616 (10-bit)
470 k - 1 M (±5%)
312
2402 (12-bit)
300 k, 330 k (±5%)
312
4808 (11-bit)
200 k (±5%)
312
6010 (10-bit)
147 k, 150k, 154 k, 158k (±1%)
312
9616 (10-bit)
121 k (±1%)
312
12020 (9-bit)
100 k (±1%)
312
14424 (9-bit)
86.6 k (±1%)
312
16828 (9-bit)
75 k (±1%)
312
19232 (9-bit)
63.4 k (±1%)
625
2402 (12-bit)
52.3 k, 53.6 k (±1%)
625
4808 (11-bit)
44.2k, 45.3 k (±1%)
625
6010 (10-bit)
39.2 k (±1%)
625
9616 (10-bit)
34 k (±1%)
625
12020 (9-bit)
30.1k (±1%)
625
14424 (9-bit)
26.1 k (±1%)
625
16828 (9-bit)
23.2 k (±1%)
625
19232 (9-bit)
20.5 k (±1%)
1250
2402 (12-bit)
18.7 k (±1%)
1250
4808 (11-bit)
16.5k (±1%)
1250
6010 (10-bit)
14.7 k (±1%)
1250
9616 (10-bit)
13 k (±1%)
1250
12020 (9-bit)
11.8k (±1%)
1250
14424 (9-bit)
10.7 k (±1%)
1250
16828 (9-bit)
9.76 k (±1%)
1250
19232 (9-bit)
FSET pin shorted to GND
1250
Same as PWM input frequency



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