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AD590JR Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças AD590JR
Descrição Electrónicos  Two-Terminal IC Temperature Transducer
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD590JR Folha de dados(HTML) 9 Page - Analog Devices

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AD590
Rev. C | Page 9 of 16
Table 4. Thermal Resistance
θJC + θCA (°C/Watt)
τ (sec)1
Medium
H
F
H
F
Aluminum Block
30
10
0.6
0.1
Stirred Oil2
42
60
1.4
0.6
Moving Air3
With Heat Sink
45
5.0
Without Heat Sink
115
190
13.5
10.0
Still Air
With Heat Sink
191
108
Without Heat Sink
480
650
60
30
1τ is dependent upon velocity of oil; average of several velocities listed above.
2Air velocity @ 9 ft/sec.
3The time constant is defined as the time required to reach 63.2% of an
instantaneous temperature change.
The time response of the AD590 to a step change in
temperature is determined by the thermal resistances and the
thermal capacities of the chip, CCH, and the case, CC. CCH is
about 0.04 Ws/°C for the AD590. CC varies with the measured
medium, because it includes anything that is in direct thermal
contact with the case. The single time constant exponential
curve of Figure 13 is usually sufficient to describe the time
response, T (t). Table 4 shows the effective time constant, τ, for
several media.
TFINAL
TINITIAL
τ
4
τ
TIME
T(t) = TINITIAL + (TFINAL – TINITIAL) × (1 – e–t/τ)
Figure 13. Time Response Curve


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