AMC1301-Q1: output behavior when VDD1 exceed abs

Chuqiang Wen

Part Number: AMC1301-Q1

Hi Expert,

My customer is doing some functional safety analysis on AMC1301-Q1. And have some questions would like to check with you.

When there have some overvoltage applied on VDD1 of AMC1301-Q1 during normal operation(power-on), the overvoltage exceed the abs value of VDD1 and will damage the VDD1 pin, may you let us know the behavior of output(VOUT_P/VOUT_N) at this case? Will VOUT_P and VOUT_N change to 0V or other? Will the loop gain increase or decrease a lot?

Customer desired behavior is that the VOUT_P and VOUT_N will change to 0V or some constant value when damage the VDD1 pin, and the loop gain not change a lot.

Thanks!

Ethan Wen

over 3 years ago

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Ethan,

I don't think that there are any guaranteed specifications when the chip is operated outside the absolute maximum ratings. Just prevent these overvoltage situations!

Kai

0 Alexander Smith over 3 years ago in reply to kai klaas69

TI__Guru 56712 points

Hi Ethan,

Please see and refer the customer to this document: https://www.ti.com/lit/fs/sbaa445/sbaa445.pdf

If damage occurs to the VDD1 pin resulting in an open-circuit, then I would expect fail-safe output as detailed in section 8.3.2 of the datasheet.

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AMC1301-Q1: output behavior when VDD1 exceed abs