INA199: What is the output of INA199 when the input is negative

Hangjie Wang

Part Number: INA199

Tool/software:

Hi expert,

What is the output when the input is negative? Because the customer finds that OC protection is triggered for the system when there is a negative voltage on the input.

Thanks

26 days ago

0 Joe Vanacore 25 days ago

TI__Genius 13150 points

Hello Hangjie,

Thank you for your post.

Can you provide the schematic and scope shots of this negative voltage?

This will help me troubleshoot your issue.

Best Regards,

Joe

0 Hangjie Wang 25 days ago in reply to Joe Vanacore

TI__Intellectual 930 points

Hi Joe,

Thanks for your quick reply, i have send the sch via email, thanks.

0 Joe Vanacore 24 days ago in reply to Hangjie Wang

TI__Genius 13150 points

Hello Hangjie,

Thank you for sending that over via email.

I noticed that C384, C385, and C836 are all the same capacitance.

This can cause issues so I would recommend either increasing the size of C384 by 10X or reduce C385 and C386 by a factor of 10.

Input Resistance Error for Current Sense Amplifiers

Please have them try this modification.

I hope this helps,

Joe

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INA199: What is the output of INA199 when the input is negative