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LDS8160 Datasheet(PDF) 30 Page - IXYS Corporation

Part No. LDS8160
Description  Dual-Output RGB / 6-Channel WLED Driver
Download  39 Pages
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Maker  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8160 Datasheet(HTML) 30 Page - IXYS Corporation

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LDS8160
© 2009 IXYS Corp.
30
Doc. No. 8160_DS, Rev. N1.0
Characteristics subject to change without notice
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
of
15.6
mA
is
sufficient
to
meet
the
Red
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 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
reduce overall power levels from the chosen 133 mW
(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 .


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