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LP8552 датащи(PDF) 15 Page - Texas Instruments

номер детали LP8552
подробное описание детали  LP8552 High-Efficiency LED Backlight Driver For Notebooks
PDF  49 Pages
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производитель  TI2 [Texas Instruments]
домашняя страница  https://www.ti.com
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LP8552 датащи(HTML) 15 Page - Texas Instruments

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SNVS693E – SEPTEMBER 2011 – REVISED SEPTEMBER 2014
(1)
Default value for CURRENT[7:0] = 7Fh (127d). Therefore, the output current can be calculated as shown in
Equation 2:
(2)
For example, if a 16-k
Ω RISET resistor is used, then the LED maximum current is 23 mA. Note that formula is only
approximation for the actual current.
8.3.2.13 PWM Frequency Setting
PWM frequency is selected with PWM_FREQ[4:0] EEPROM register. If PLL clock frequency multiplication is
used, it will affect the output PWM frequency as well. <PWM_RESOLUTION[1:0]> EEPROM bits will select the
PLL output frequency and hence the PWM frequency and resolution. Below are listed PWM frequencies with
<EN_VSYNC]> = 0. PWM resolution setting affects the PLL clock frequency (5 MHz to 40 MHz). Highlighted
frequencies with boldface can be selected also with external resistor RFSET. To activate RFSET frequency selection
the <EN_F_RES> EEPROM bit must be 1.
Table 1. Available PWM Frequencies and Resolutions
PWM_RES[1:0]
00
01
10
11
PWM_FREQ[4:0]
5 MHz
10 MHz
20 MHz
40 MHz
RESOLUTION (bits)
11111
19232
-
-
-
8
11110
16828
-
-
-
8
11101
14424
-
-
-
8
11100
12020
-
-
-
8
11011
9616
19232
-
-
9
11010
7963
15927
-
-
9
11001
6386
12771
-
-
9
11000
4808
9616
19232
-
10
10111
4658
9316
18631
-
10
10110
4508
9015
18030
-
10
10101
4357
8715
17429
-
10
10100
4207
8414
16828
-
10
10011
4057
8114
16227
-
10
10010
3907
7813
15626
-
10
10001
3756
7513
15025
-
10
10000
3606
7212
14424
-
10
01111
3456
6912
13823
-
10
01110
3306
6611
13222
-
10
01101
3155
6311
12621
-
10
01100
3005
6010
12020
-
10
01011
2855
5710
11419
-
10
01010
2705
5409
10818
-
10
01001
2554
5109
10217
-
10
01000
2404
4808
9616
19232
11
00111
2179
4357
8715
17429
11
00110
1953
3907
7813
15626
11
00101
1728
3456
6912
13823
11
00100
1503
3005
6010
12020
11
00011
1202
2404
4808
9616
12
00010
1052
2104
4207
8414
12
Copyright © 2011–2014, Texas Instruments Incorporated
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Product Folder Links: LP8552



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