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Sensor Based Thermal Specification Design Guidance
5.6
Specification for Operation Where Digital Thermal
Sensor Exceeds T
Table 5-1
speed control algorithm.
Table 5-1.
Thermal Solution Performance above T
T
AMBIENT
43.2
42.0
41.0
40.0
39.0
38.0
37.0
36.0
35.0
34.0
33.0
32.0
31.0
30.0
29.0
28.0
27.0
26.0
25.0
24.0
23.0
22.0
21.0
20.0
19.0
18.0
Notes:
1.
The ambient temperature is measured at the inlet to the processor thermal solution
2.
This column can be expressed as a function of T
Ψ
= 0.19 + (43.2 - T
CA
3.
This column can be expressed as a function of T
= 0.19 + (43.2 - T
Ψ
CA
4.
This table is provided as a reference please consult the product specification for current values.
5.
Based on the testing performed a curve was fit to the data in the form
Psi_ca = (1+a*RPM)/(b+c*RPM) where
a = 0.000762, b = 0.667637, c = 004402
Thermal/Mechanical Design Guide
CONTROL
is provided as reference for the development of thermal solutions and the fan
Ψ
at
1
CA
2
DTS = T
CONTROL
0.190
0.206
0.219
0.232
0.245
0.258
0.271
0.284
0.297
0.310
0.323
0.336
0.349
0.362
0.375
0.388
0.401
0.414
0.427
0.440
0.453
0.466
0.479
0.492
0.505
0.519
) * 0.013
AMBIENT
) * 0.0077
AMBIENT
CONTROL
RPM for Ψ
at
Ψ
CA
5
DTS = T
DTS = -1
CONTROL
N/A
N/A
N/A
3250
2600
2200
1900
1700
1450
1300
1200
1100
1000
900
850
800
700
700
650
600
600
600
600
600
600
600
by the following equation:
AMBIENT
by the following equation:
AMBIENT
§
at
RPM for Ψ
CA
CA
3
DTS = -1
0.190
N/A
0.199
N/A
0.207
N/A
0.215
N/A
0.222
3500
0.230
3150
0.238
2400
0.245
2500
0.253
2500
0.261
2100
0.268
1900
0.276
1700
0.284
1650
0.292
1550
0.299
1450
0.307
1350
0.315
1250
0.322
1200
0.330
1100
0.338
1050
0.345
1000
0.353
950
0.361
900
0.368
900
0.376
850
0.384
800
at
5
37
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