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AD590KF Datasheet(PDF) 9 Page - Analog Devices |
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AD590KF Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page Data Sheet AD590 Rev. G | Page 9 of 16 As an example, for the TO-52 package, θJC is the thermal resistance between the chip and the case, about 26°C/W. θCA is the thermal resistance between the case and the surroundings and is determined by the characteristics of the thermal connection. Power source P represents the power dissipated on the chip. The rise of the junction temperature, TJ, above the ambient temperature, TA, is TJ − TA = P(θJC + θCA) (1) Table 4 gives the sum of θJC and θCA for several common thermal media for both the H and F packages. The heat sink used was a common clip-on. Using Equation 1, the temperature rise of an AD590 H package in a stirred bath at 25°C, when driven with a 5 V supply, is 0.06°C. However, for the same conditions in still air, the temperature rise is 0.72°C. For a given supply voltage, the temperature rise varies with the current and is PTAT. Therefore, if an application circuit is trimmed with the sensor in the same thermal environment in which it is used, the scale factor trim compensates for this effect over the entire temperature range. 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 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 16 is usually sufficient to describe the time response, T (t). Table 4 shows the effective time constant, τ, for several media. Figure 16. Time Response Curve TFINAL TINITIAL 4 TIME T(t) = TINITIAL + (TFINAL – TINITIAL) × (1 – e–t/) |
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