AD590(2003) Просмотр технического описания (PDF) - Analog Devices

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производитель

AD590
(Rev.:2003)

Two-Terminal IC Temperature Transducer

Analog Devices 

Table 4. Thermal Resistance

θJC + θCA (°C/Watt)

Medium

H

F

Aluminum Block

30

10

Stirred Oil2

42

60

Moving Air3

With Heat Sink

45

–

Without Heat Sink 115

190

Still Air

With Heat Sink

191

–

Without Heat Sink 480

650

τ (sec)1

H

F

0.6

0.1

1.4

0.6

5.0

–

13.5 10.0

108

–

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

AD590

response, T (t). Table 4 shows the effective time constant, τ, for

several media.

TFINAL

T(t) = TINITIAL + (TFINAL – TINITIAL) × (1 – e–t/τ)

TINITIAL

τ

4τ

TIME

Figure 13. Time Response Curve

Rev. C | Page 9 of 16

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