Operational Amplifiers

Q&A Input Power Rail detection circuit

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Input Power Rail detection circuit

DavidZ on Mar 31, 2014

I have the circuit as in attached image.

It will auto detect the input power rail VPWR ( 12V or 5V ).

If the input power rail is 12V, the VPWR_SEL will be “high” otherwise VPWR_SEL will be low.

My co-worker keep bothering me for long time for this circuit.

Do you thank it will work properly as what I want ?

Very appreciate for your suggestions.

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0 DavidZ on Mar 31, 2014 8:32 PM over 6 years ago

Yes, you are right.

Better to use the circuit with less components.

Except 6V, any other problems?

My concern is that : AD8451 is a single power rail part; Can it will work properly in this circuit?

Many thanks.
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0 DavidZ on Mar 31, 2014 8:32 PM over 6 years ago

Yes, you are right.

Better to use the circuit with less components.

Except 6V, any other problems?

My concern is that : AD8451 is a single power rail part; Can it will work properly in this circuit?

Many thanks.
Cancel
Up 0 Down

Reply

Verify Answer

Cancel

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