Datenblatt-Suchmaschine für elektronische Bauteile |
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AD590KH Datenblatt(PDF) 9 Page - Analog Devices |
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AD590KH Datenblatt(HTML) 9 Page - Analog Devices |
9 / 16 page 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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