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LDS8160
Temperature vs. PWM Duty Cycle Profiles
temperature with maximum
ambient
operating
The user must load the PWM correction look up
tables (LUTs) prior to operation. For the LDS8160 all
three tables, LUT-B, LUT-G and LUT-R require
loading (even if using same data for a WLED
application) with the user correction profiles prior to
operation. For RGB applications, LUT-B which drives
LEDA1 And LEDA2 respectively should be assigned
as the Blue color channel. LUT-G which drives
LEDB1 and LEDB2 should be assigned as the Green
color channel, and LUT-R which drives LEDC1 and
LEDC2 should be the RED channel.
The correction tables are based upon LED vendor
characteristics for luminosity vs temperature and
current, LED current de-rating specifications, and
user system thermal design parameters. Figure 7
shows an actual Luminosity vs. Temperature curve of
the NSSM038AT-E RGB LED available from Nichia
Corp.
Figure 7: Luminosity vs. Temperature curve
temperature of 85oC.
Figure 8: Luminosity vs. LED Forward Current
for Nichia NSSM038AT-E RGB LED
~ linear from
0 -30 mA
0
(NSSM038AT-E RGB LED from Nichia)
Figure 9: Total power (combined R, G, and B
diodes) power de-rating curve
(NSSM038AT-E RGB LED from Nichia)
Figure 8 shows the typical LED characteristic of
decreasing illumination over temperature, but each
color changes differently. This results in white light
color shifts over temperature if not accounted for. It is
typical to see RED LED Luminosity vs Temperature
to change by ± 50% relative to the 25oC level.
Figure 9 shows that luminosity is linearly dependent
with LED forward currents ≤ 30 mA. Therefore loss of
LED luminosity over temperature can be
compensated for by associated increases in LED
current.
Figure 9 gives the total RGB Power de-rating
specification for the same Nichia NSSM038AT-E
RGB LED. Total power is the combined power (V F x
I F ) of each color LED. This curve specifies the
maximum RGB LED power that insures not
exceeding the maximum specified junction
Figure 10 shows the final plot of typical LDS8160
PWM LUT correction profiles that could be
programmed by the user to adjust for this RGB LED.
This accumulated correction takes into account both
the Luminosity vs Temperature variations and the
adjustments to meet the higher temperature power
de-rating specification.
Given the 5oC increments of the temperature
adjustment intervals for the LDS8160, the currents
are slowly ramped to equalize loss of light output
before the de-rating profile begins. Once de-rating
begins, the PWM duty cycle is reduced, lowering LED
driver current, to insure meeting and regulating to the
desired maximum operating temperature.
? 2009 IXYS Corp.
Characteristics subject to change without notice
16
Doc. No. 8160_DS, Rev. N1.0
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