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LP5520 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LP5520
Descripción Electrónicos  RGB Backlight LED Driver
PDF  46 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LP5520 Datasheet(HTML) 11 Page - Texas Instruments

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background image
-40
-20
0
20
40
60
80
TEMPERATURE, °C
0.310
0.305
0.300
0.295
0.290
Y
X
0.310
0.305
0.300
0.295
0.290
-40
-20
0
20
40
60
80
100 120
TEMPERATURE
4000
3500
3000
2500
2000
1500
1000
500
0
Red
Blue
Green
4000
3500
3000
2500
2000
1500
1000
500
0
-40
-14
12
38
64
90
TEMPERATURE,°C
0.34
0.32
0.31
0.29
0.28
0.26
X
Y
0.34
0.32
0.31
0.29
0.28
0.26
11
LP5520
www.ti.com
SNVS440B – MAY 2007 – REVISED MARCH 2016
Product Folder Links: LP5520
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
Feature Description (continued)
Figure 12. Typical Color Coordinates vs Temperature for Uncompensated RGB LED
The compensation values for the measured temperatures can be easily calculated when the intensity vs
temperature information is available. For the best accuracy the iterative calibration approach must be used.
Figure 13. Compensation PWM Values
The compensation values must be converted to 16°C intervals when they are programmed to the calibration
EEPROM. The evaluation software has import function, which can be used to convert the measured
compensation data to the 16°C interval format. The measured data can have any temperature points, and the
software fits a curve through the measured points and calculate new PWM values in fixed temperatures using the
curves.
Typical color coordinate and intensity stability over temperature are shown in Figure 14 and Figure 15.
Figure 14. Compensated Color Coordinates vs Temperature



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