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AN4291 Datasheet(PDF) 37 Page - STMicroelectronics

Part # AN4291
Description  STEVAL385LED4CH: four independent high brightness LED
PDF  53 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4291 Datasheet(HTML) 37 Page - STMicroelectronics

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AN4291
Measurements
Figure 15. Current regulation - same channels, different current setup
Next picture shows a single channel with different dimming levels. The dimming values are:
R1 = 20 units (7.8%); R2 = 50 units (19.5%); R3 = 150 units (58.6%); R4 = 200 units
(78.1%); 3 = 255 units (99.6%). The OFF phase of the 3 line is equal to one dimming unit
corresponding to 1/256 parts of 5,12 ms (~20 µs).
Figure 16. Current regulation - same channels, different dimming
AM16715v1
AM16716v1



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