INA169: Any concerns having output saturated at 0V for long periods at a time

Visaacan Rathiraj

Part Number: INA169

Hi currently using the INA169 for current monitoring of our system which as after a relay
we are in works of a new version of the board and I want to add a second one before the relay to measure the current flow of a charger to the battery during charging. I will ensure the positive terminal of the INA is connected to the charger positive rail and negative terminal of the INA to the positive rail of the battery

I am wondering if there is any concerns with doing this as the currents will be switching directions here and there and saturating the output of the INA at 0V for long periods at a time.

There is no need for bidirectional sensing at this moment as we want to have the separate INA for measuring current to a specific load after the relay

over 1 year ago

0 Cierra Cowley over 1 year ago

TI__Intellectual 1235 points

Hi Visaacan,

Do you have a schematic of this system?

If you are expecting a negative voltage at the inputs when the current has switched directions, you should ensure the absolute maximum common-mode voltage and differential voltage ratings are not violated. This can result in permanent damage to the INA.

Cierra

0 Visaacan Rathiraj over 1 year ago in reply to Cierra Cowley

Prodigy 60 points

Hi Cierra,

Thanks for the reply if possible I can discuss/share more details over email?

Regards,
Visaacan

0 Cierra Cowley over 1 year ago in reply to Visaacan Rathiraj

TI__Intellectual 1235 points

Hi Visaacan,

I sent you a friend request so we can discuss in direct messages on E2E.

Thanks,

Cierra

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INA169: Any concerns having output saturated at 0V for long periods at a time