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regarding UAF42 operating temperature.

Paranichandar Paramasivam
Prodigy 120 points
Other Parts Discussed in Thread: UAF42

Hello,

We are using a butterworth 2nd order filter using UAF42. the circuit was working fine but the IC UAF42 (TSSOP PACK) seems to be over hot  during its operation., does this one really operates like this?

  • 0
    TI__Guru* 93105 points

    Hello Paranichandar,

    No, the nominal UAF42 power dissipation is less than 0.2 W with +/-15 V supplies and that would not result in the device becoming very hot. The package temperature should only rise a matter of degrees above the ambient temperature in normal operation. If the output filter and/or uncommitted op-amp stage is driving a load, then there will be some power dissipation in the output stage. However, the added dissipation shouldn't add much heat.

    Be sure to check the dc level at each amplifier output and make sure the voltage is near the middle of the supply range. For equal +V/-V supplies, that would be 0 V. Do this without an ac signal applied to the input of the filter. If you have a way to measure and confirm the Vs + and Vs- currents they should be close to the typical values (6 mA). Also, use an oscilloscope to check the outputs for the presence of oscillation. High dc current often accompanies an oscillating amplifier. Oscillation would lkely increase power dissipation and the device package temperature.

    Regards, Thomas

    PA - Linear Applications Engineering