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OPA4170: short-circuit current

Expert 3875 points

Replies: 1

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Part Number: OPA4170

Hi,

A capacitive load is connected to the 3 channel output terminal of the OPA4170AIPW.

When the short-circuit current of the output terminal was measured, it was confirmed that the waveform of the short-circuit current of about 20 mA for about 1 ms at 120 Hz cycle was flowing, and almost no heat was generated.

Are there any concerns? Please let me know.

Thanks and best regards,

M.HATTORI.

1 Reply

  • Hello,

    It is not recommended to connect a capacitive load directly on the output of op amps because it will cause stability issues. I recommend watching our TI Precision Lab Videos on Op Amp Stability.

    What is causing the 20mA current limit to occur? Is there a fast transient waveform on the input causing the amplifier to output its maximum current to quickly charge the capacitor?

    I would also recommend watching the TI Precision Lab Videos on Power and Temperature for how to calculate the maximum temperature the op amp might increase to.

    Thank you,

    Tim Claycomb

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