參數(shù)資料
型號(hào)： LDS9003-002-T2
廠商： IXYS
文件頁數(shù)： 13/30頁
文件大小： 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）
傳感器類型： 外部
拓?fù)洌?/td> ADC，振蕩器，寄存器庫
輸出類型： I²C?
輸出警報(bào)： 無
輸出風(fēng)扇： 無
電源電壓： 2.5 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 16-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 16-TQFN
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： LDS9003-002-T2-6
LDS9003 / 9001
?009 IXYS Corp.
13
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
10 ms with the soft-start ramp mode disabled by
setting  bit  1  of  the  Configuration  Register  (1Eh)
HIGH.
The  calibration  parameters  for  the  temperature
measurement    engine    and    all    customer-set
parameters remain intact until the part is reset or
powered-down.   Additionally,   the   user   can   re-
calibrate LDS9003 / 9001 during times when LED
currents  are  brought  to  zero  and  the  system  is
thermally stabilized by programming the calibration
command bit as discussed.
Temperature vs PWM Duty Cycle Profiles
The user must load the PWM correction look up
tables (LUTs) prior to operation. For the LDS9003 all
three tables, LUT1, LUT2 and LUT3 require loading
(even if using same data) with the user correction
profiles  prior  to  operation.  The  LDS9001  just
requires loading of LUT1.
The correction tables are based upon LED vendor
characteristics for illumination vs temperature and
current, LED  current  de-rating  specifications,  and
user   system  thermal  design   parameters.  The
following figures show examples for Luxeon Rebel
WLEDs,
Figure 3:  Typical Light Output vs Temperature
for Luxeon Rebel 3W  WLED
Figure   3   shows   the   typical   characteristic   of
decreasing   illumination   over   temperature   by
approximately 30% from -20篊 to 100篊.
Figure 4  shows  that illumination  is approximately
linearly   dependent   with   LED   forward   current.
Therefore loss of illumination over temperature can
be compensated by associated  increases in LED
current.
Figure 4:  Typical Light Output vs LED Current for
Luxeon Rebel WLED
Figure 5 gives the LED current de-rating specification
for a Luxeon Rebel WLED for 700mA LED current that
insures not exceeding the maximum specified LED
junction temperature of 150篊. This specific curve is
for thermal resistance, ?/DIV>
JC,
from LED junction to case
designed for 12.5篊/W.
Figure 5:  Typical LED Current De-rating vs Case
Temperature for Luxeon Rebel WLED
It  is  customary  for  LED  lighting  systems  to  be
designed with guard-bands to the operating level to
account for design variations in the actual thermal
profile and  to maximize operating lifetimes. A user
may target a lower maximum junction temperature
than the absolute maximum rating specified by the
LED vendor, such as 125篊, for example, as well as
reducing the LED operating current=
The lower Tj guard-band will shift the curve to the
right,  extending  maximum  lifetime,  but  the  lower
operating  current  guard-banding  results  in  more
LEDs lamps  per fixture to meet the desired lumen
output level.
LED Current vs Temperature (case)
12.5 C?W J-C
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