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LDS8160
nominal current setting for Green at 25oC, set the
Green Dynamic Dimming PWM level for 15 mA /
15.6 mA x 100% = 96% duty cycle. This insures
sufficient range for temperature correction. Then
the PWM Duty Cycle would be at 12.9 mA / 15.6
mA = ~ 82.7% for Red LED and 9.8 mA / 15.6 mA =
62.8% for Blue LED.
Note: maximum Red LED current at 5oC would be
1.2 * 12.9 mA = 15.48 mA, so the maximum current
In this approach Green LED current would be set for
15.6mA , while Red LED current would be 15.6 mA / 15
ma x 12.9 mA = 13.4 mA , and Blue LED current 15.6
mA / 15 mA x 9.8mA = 10.2mA . The PWM Dynamic
Dimming level could then be set at 96% Duty Cycle for
all three channels to meet the 15 mA for Green at
25oC. Further dimming needs could use the Global
PWM Dimming feature.
As can be seen, adjusting for white balance can
of 15.6 mA is sufficient to meet the
Red
reduce overall power levels from the chosen 133 mW
temperature compensation requirements.
This approach uses same static DC current to
establish the ‘base” chromaticity point of the LEDs.
Color mixing is then performed with PWM
adjustment without any additional color shifts.
A second approach is to establish the white balance
ratio at maximum current using the static LED
current settings.
(in this example). Different maximum current level
points could be chosen to increase overall luminosity
level and still meet total 133 mW power level.
These choices are user/application dependent. The
approach overviewed in the example can be applied to
other RGB LEDs.
? 2009 IXYS Corp.
Characteristics subject to change without notice
30
Doc. No. 8160_DS, Rev. N1.0
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