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參數(shù)資料
型號(hào): LDS89001008-T2
廠商: IXYS CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PDSO8
封裝: 3 X 2 MM, ROHS COMPLIANT, MO-220, DFN-8
文件頁(yè)數(shù): 6/30頁(yè)
文件大小: 622K
代理商: LDS89001008-T2
LDS9003 / 9001
2009 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 5C 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
2C 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
1
45
1
-30
0
1
50
0
1
-25
-1
1
55
0
1
-20
0
1
60
0
1
-15
0
1
65
1
-10
0
1
70
0
1
-5
-1
1
75
-1
1
0
1
80
-2
1
5
0
1
85
-3
1
10
0
1
90
-5
1
15
0
1
95
-6
1
20
-1
1
100
-6
1
25
0
1
105
-7
1
30
0
1
110
-7
1
35
0
1
115
-7
1
40
1
120
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
0C 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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