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Original question:

Heating of LM124AJ Quad OPamp

OPA171-Q1: OPA171-Q1

nachiket wawoo
Prodigy 55 points
Part Number: OPA171-Q1
Other Parts Discussed in Thread: OPA171

Hello All,

I would like to understand that how unstability or oscillations at the output of OPAMP causes heating of device?

BR,

Nachiket W.

  • 0
    TI__Guru**** 150436 points
    Hello Nachiket,

    Are you saying that you are observing higher temperature on OPA171-Q1 when the output is unstable?

    If the output load is capacitive then the output current to the load capacitor will be higher when oscillating so that could increase OPA171 temperature. A large capacitive load also affects stability making oscillation more likely.
  • 0 in reply to Ron Michallick
    Prodigy 55 points

    Hello Mr. Michallick,

    greetings!

    Yes, i see 200KHz 200mV oscillations on the output of OPA171. It is also correct that i am driving capacitive load and due to which opamp is unstable. when i introduced 47 ohm resistor at the output of OPA171 then oscillations were vanished and temperature was down to normal room temperature.

    BR,

    Nachiket Wawoo.

  • 0 in reply to nachiket wawoo
    Guru 140200 points
    Hi Nachiket,

    measure the supply current of OPA171 during oscillation and you will see the cause of heating...

    Kai