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參數資料
| 型號： | LDS89001008-T2 |
| 廠商： | IXYS CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 3 X 2 MM, ROHS COMPLIANT, MO-220, DFN-8 |
| 文件頁數： | 9/30頁 |
| 文件大小： | 622K |
| 代理商： | LDS89001008-T2 |
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LDS9003 / 9001
2009 IXYS Corp.
17
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
programmed Temperature vs PWM thermal control
profile. For example if the thermal control profile
requires increasing the PWM duty cycle by 5% prior
to de-rating to account for light output loss with
temperature, than the User PWM registers 05h, 06h,
and 07h should be programmed with maximum of
code FBh for 95% duty cycle at room temperature.
Figure 8: Dynamic Mode Dimming in Logarithmic
Mode in dB vs. register 05h, 06h and 07h data
(0dB dimming = full LED brightness)
Figure 9: Dynamic Mode Dimming in Logarithmic
Mode in percent vs. register 05h, 06h and 07h (0%
dimming = full LED brightness)
Global PWM Dimming Control
Further dimming by the user to control real-time
brightness, if desired, should then be done using the
Global Dimming option by writing register 04h. Code
00h in this register represents no further dimming
from the current level set by the user in the IPWM
duty cycle registers 05h, 06h, and 07h.
The final dimming code value is the algebraic sum of
three codes: the user Dynamic Dimming code, Global
Dimming Code, and the Temperature Compensation
Code. If this sum is equal or below zero, LED in
particular channel is limited to 0% duty cycle (i.e. the
channel is OFF). It means that Global Dimming
dynamic range is limited by Dynamic Dimming and
Temperature Correction Table used.
As an example:
If Dynamic Dimming in the particular channel is set
by -20 dB (registers 05h – 07h data code 143 (dec))
and
Temperature
Correction
requires
8
steps
dimming (data code 8 (dec)), the maximum allowable
Global Dimming range = 143 – 8 = 135 (dec) steps or
~21.4 dB.
Figure 10 shows the dimming transfer function for
dimming level in dB (from maximum level) vs
programmed data code (decimal).
Figure 11 shows the dimming transfer function for
dimming level in percent (%) vs programmed data
code (decimal). 0% dimming is full ON brightness
(i.e. PWM duty cyle = 100%).
LED-Sense
TM High Temperature Current De-rating
The
LDS9003/9001
integrates
the
IXYS
LED-
Sense
TM
temperature
measurement
and
PWM
current/duty cycle control algorithm to insure LED
reliability and operating life-times.
LED current is controlled and de-rated via automatic
adjustments in the PWM duty cycle to meet LED
vendor
power
dissipation
vs
LED
junction
temperature
specifications
and
system
thermal
constraints
Figure 10: Global Dimming in Logarithmic Mode
in dB vs. register 04h data
(0dB dimming = full LED brightness)
User programmable de-rating adjustments are stored
in a correction LUT(s) comprised of sixteen 8-bit
registers each for up to three sensing and control
channels (LDS9001 is only one channel). Registers
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