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參數(shù)資料
| 型號： | LDS9003-002-T2 |
| 廠商： | IXYS |
| 文件頁數(shù)： | 14/30頁 |
| 文件大?。?/td> | 425K |
| 描述： | IC TEMP/PWM CONTROLLER 16WQFN |
| 標準包裝： | 1 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類型： | 外部 |
| 拓撲： | ADC，振蕩器，寄存器庫 |
| 輸出類型： | I²C? |
| 輸出警報： | 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： | 標準包裝 |
| 其它名稱： | LDS9003-002-T2-6 |
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LDS9003 / 9001
?009 IXYS Corp.
14
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
LED-Sense
TM
can eliminate the amount of operating
current guard-banding as the direct measurement of
the LED Tj reduces min to max thermal uncertainty.
Figure 6 shows a typical LDS9003 / 9001 PWM LUT
correction profile that could be programmed by the
user.
Given the 5篊 increments of the temperature
adjustment intervals for the LDS9003 / 9001, 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 LED Tj.
Table 10 shows a simple text format of the
correction table for the graph shown in Figure 6.
Table 11 shows the exact data loaded to the LUTs
I
2
C address locations as defined in Table 8.
Figure 6: Example LDS9003 / 9001 Accumulated
PWM Correction Curve
.
Table 10: PWM Correction Look Up Table Example (per graph)
Temp. LUT1 LUT2 LUT3 Scale Temp. LUT1 LUT2 LUT3 Scale
-35
0
0
0
1
45
1
1
1
1
-30
0
0
0
1
50
0
0
0
1
-25
-1
-1
-1
1
55
0
0
0
1
-20
0
0
0
1
60
0
0
0
1
-15
0
0
0
1
65
1
1
1
1
-10
0
0
0
1
70
0
0
0
1
-5
-1
-1
-1
1
75
-1
-1
-1
1
0
0
0
0
1
80
-2
-2
-2
1
5
0
0
0
1
85
-3
-3
-3
1
10
0
0
0
1
90
-5
-5
-5
1
15
0
0
0
1
95
-6
-6
-6
1
20
-1
-1
-1
1
100
-6
-6
-6
1
25
0
0
0
1
105
-7
-7
-7
1
30
0
0
0
1
110
-7
-7
-7
1
35
0
0
0
1
115
-7
-7
-7
1
40
1
1
1
1
120
0
0
0
0
Note:
3 LUTs required for LDS9003 (can be same or different).
1 LUT only needed for LDS9001.
Table entries represent PWM correction steps change from the last temperature step point
Table is based on 25
0
C reference point.
Steps are accumulated per this table as temperature increases or decreases.
If Scale = 1, each step is ~ 0.17 dB change in PWM duty cycle,
If Scale = 2, each step is ~ 0.34 dB change in PWM duty cycle,
The correction table stored in the correction LUT is
referenced to the LED Tj. Register 49h can be used
to apply the Ta-Tj temperature offset between the
ambient (or case) and the LED junction temperature.
This can effect a +/- shift of the correction curve in
the Temperature axis to reference the profile to
ambient or case temperature points.
Register 4Ah sets the LEDs shutdown junction
temperature per the T-codes provided in Table 7.
When this temperature is exceeded, all of the IPWM
channels are disabled (i.e. 0% duty cycle) to insure no
damage to the LEDS. Additionally, an LED OT (over
temperature) status flag is set HIGH in Bit 7 of the
enable channel register 03h. If the flag is set the user
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