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OPA552: OPA552

Zsolt Danyi
Prodigy 160 points

Part Number: OPA552
Other Parts Discussed in Thread: OPA551

Dear Support,

I have a fairly simple opamp circuit which produces 0 - -20V output voltage. To invert my positive 0-20V, I use the OPA552 chip, with a basic G=1, 2x15kOhm resistor. 

My question is that my chip is getting hot quite fast, despite the fact, that is works as it should. I attach a pic about the circuit. Could you help me about what do I miss, why I am getting a very high junction temperatutr?

Sincerelly

Zsolt Danyi

  • 0
    Guru 140200 points

    Hi Zsolt,

    the OPA552 is very probably oscillating because you run it at a noise gain of 2V/V. Take care, the OPA552 is decompensated and needs a minimum gain of 5V/V. I would take the OPA551 which is not decompensated and will work at a gain of -1V/V (= noise gain of 2V/V).

    By the way, what is connected to the output of OPA552? If there's a high capacitive load, the OPA551 may also run into trouble. Can you show a complete schematic of the OPA552 circuit?

    Kai

  • 0
    TI__Guru* 77501 points

    Hi Zsolt,

    Kai's comments cover the possible causes of the issue. 

    Please provide us the load value, load type and BW requirements etc., and maybe we are able to compensate it for you. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Prodigy 160 points

    Thank you Kai, Raymond. I will try the OPA551 first and if it doesn't work I will get back to you. I dont want to waste your time if it works with the 551.

    Thank you, Cheers 

    Zsolt

  • 0 in reply to Zsolt Danyi
    TI__Guru* 77501 points

    Hi Zsolt, 

    I am going to close the inquiry for now. If you have additional questions, you are still able to open the thread, and resolver any other issues that you may have. 

    Best,

    Raymond