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LDS8160 Datasheet(PDF) 15 Page - IXYS Corporation

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

LDS8160 Datasheet(HTML) 15 Page - IXYS Corporation

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LDS8160
© 2009 IXYS Corp.
15
Doc. No. 8160_DS, Rev. N1.0
Characteristics subject to change without notice
For example, to decrease LED brightness by 50%
(-6dB) at all three LED banks, Global PWM Dimming
data code written in register 04h should be 6/0.17 =
35 (decimal) = 23h (see Figure 6: Global Dimming in
Logarithmic Mode in percent vs. register 04h data
(0% dimming = full LED brightness).
The LDS8160 integrates temperature measurement
and compensation processing to maintain stable LED
brightness across varying ambient temperature and
de-rate power dissipated by LEDs, if the LED die
temperature exceeds a preset value.
Figure 3: Dynamic Mode Dimming in Logarithmic
Mode in dB vs. registers 05h – 07h data
(0dB dimming = full LED brightness)
Figure 4: Dynamic Mode Dimming in Logarithmic
Mode in percent vs. registers 05h – 07h data
(0% dimming = full LED brightness)
Measured temperatures
are encoded into
5-bit
T-codes representing 5
0C temperature intervals from
-35 to +120
0C. The measured T-code addresses
stored ΔPWM adjustment codes to adjust the
dimming level and therefore average current through
the LEDs. The user loads specific ΔPWM codes into
the LUTs to maintain constant average current and
therefore luminosity over temperature.
LUT corrections codes are added/subtracted to/from
the user-set duty cycle/dimming codes (dynamic
and/or global) for the channel to correct LED
brightness.
The LDS8160 integrates a 10-bit ADC and digital
processing
to
determine
LED
temperatures
approximately every 2.5 seconds. The proprietary
LED-Sense
TM algorithm allows direct measurement of
LED junction temperatures on the LEDA1, LEDB1,
and LEDC1 driver channels. Additionally an on-chip
silicon temperature sensing diode is also measured
to enhance temperature estimation accuracy.
Figure 5: Global Dimming in Logarithmic Mode in
dB vs. register 04h data
(0dB dimming = full LED brightness)
Figure 6: Global Dimming in Logarithmic Mode in
percent vs. register 04h data
(0% dimming = full LED brightness)
In normal operation mode, the LDS8160 senses the
LED temperatures from all 3 available channels when
in the default RGB (3 channel) mode, or only from the
LEDA1 channel when used in the WLED (single
channel) mode.


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