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OPA2206:Amplifiers forum

Kenta Matsuura
Prodigy 10 points
Part Number: OPA2206

Tool/software:

過電圧保護について知りたいです。

絶対最大定格信号入力ピン電圧は (V+) + 40 と記載されていますが、電源オフ (V+=0) の状態で入力ピンに 12V 信号が印加された場合、この IC は保護されますか?

  • +1
    Guru 283200 points

    This makes no difference; the protection circuit does not need a regular power supply.

    But note that overvoltage causes a current to flow into the power supply (see section 7.3.1).

  • +1
    TI__Guru 56891 points

    Hi Matsuura-san,

    This figure is what Clemens refers to. I interpret the query based on the translation.

    Yes, IC's input terminal will be protected even under the non-powered LDO or V+ state, however, the protection circuit must provide ZD1 for the current path, since most LDOs on the market is unable to sink current.

    If V+ is able to sink current, then ZD1 is not required per the query (single supply rail case, where V- = GND). 

    The same is true for the IC's negative input terminal under-voltage protection as well, assume dual supply rails. 

    If you have other questions, please let us know. 

    Best,

    Raymond