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LDS8160
Figure A1.6 shows the effective curve formed by the
accumulated ΔPWM codes.
The curves in the accumulated Δ PWM codes
should have same slope characteristics as the
curves in Figure A1.5.
For WLED applications the Luminosity vs.
Temperature characteristics are similar to Blue
LEDs with the added effects of the yellow phosphor
coatings applied. In general, Luminosity of WLEDs
codes. The option for Linear Mode will adjust the code
entries and calculations accordingly.
Using the LDS8160 temperature compensation
capability to de-rate LEDs automatically, allows the
LED to be operated at maximum luminosity levels
(higher currents) and can reduce the total number of
LEDs required and/or reduce the total LED system
level power over systems that do not employ LED
temperature compensation. Figure A1.7 depicts this.
with de-rating start at 55 C
and shutdown at 85 C
remains flat with temperature changed, but still
requires high temperature de-rating.
Figure A1.7: Allowable LED Forward Current vs.
Temperature
(WLED NSSW020BT-P1 from Nichia)
Figure A1.6: Accumulated Δ PWM Correction Codes
Typically, a single Δ PWM LUT correction table can
be used for all WLEDs. Δ PWM codes for the
correction table are calculated similarly to RGB
0
0
? 2009 IXYS Corp.
Characteristics subject to change without notice
27
Doc. No. 8160_DS, Rev. N1.0
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