參數(shù)資料
型號(hào)： LDS9003-002-T2
廠(chǎng)商： IXYS
文件頁(yè)數(shù)： 17/30頁(yè)
文件大?。?/td> 425K
描述： IC TEMP/PWM CONTROLLER 16WQFN
標(biāo)準(zhǔn)包裝： 1
功能： 溫度監(jiān)控系統(tǒng)（傳感器）
傳感器類(lèi)型： 外部
拓?fù)洌?/td> ADC，振蕩器，寄存器庫(kù)
輸出類(lèi)型： I²C?
輸出警報(bào)： 無(wú)
輸出風(fēng)扇： 無(wú)
電源電壓： 2.5 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 16-TQFN
包裝： 標(biāo)準(zhǔn)包裝
其它名稱(chēng)： LDS9003-002-T2-6
LDS9003 / 9001
?009 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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