AD590JRZ-RL Ver la hoja de datos (PDF) - Analog Devices

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AD590JRZ-RL

2-Terminal IC Temperature Transducer

Analog Devices 

Table 4. Thermal Resistance

θJC + θCA

(°C/Watt)

Medium

H

F

Aluminum Block

Stirred Oil2

Moving Air3

30

10

42

60

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

1 τ is dependent upon velocity of oil; average of several velocities listed above.

2 Air velocity @ 9 ft/sec.

3 The 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 15 is usually sufficient to describe the time

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

several media.

AD590

TFINAL

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

TINITIAL

τ

4τ

TIME

Figure 15. Time Response Curve

Rev. E | Page 9 of 16

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