LP5520 datasheet(11/46 Pages) TI1

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-40

-20

TEMPERATURE, °C

0.310

0.305

0.300

0.295

0.290

0.310

0.305

0.300

0.295

0.290

-40

-20

100 120

TEMPERATURE

4000

3500

3000

2500

2000

1500

1000

500

Red

Blue

Green

4000

3500

3000

2500

2000

1500

1000

500

-40

-14

TEMPERATURE,°C

0.34

0.32

0.31

0.29

0.28

0.26

0.34

0.32

0.31

0.29

0.28

0.26

LP5520

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SNVS440B – MAY 2007 – REVISED MARCH 2016

Product Folder Links: LP5520

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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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