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INA169: INA169 for higher VCM application

Part Number: INA169
Other Parts Discussed in Thread: INA138, INA139, INA168

Hi Support team,

My customer wishes to use INA169 for 100V application, and wondering if the following circuit is going to work. Can they do the floating ground to sense Vbus > 60V?

Thanks a lot.

Best Regards,

Wei-Hao

  • Hello Wei-Hao,

    Thanks for using our forum.  I am concerned that if your charge pump is not carefully designed, that the rise in the device ground could substantially lag behind the rise of the device supply Vout', thereby creating a condition where the device is operating outside of the device absolute maximum ratings.  Typically, to float the device ground we recommend a circuit topology like the one in this app note.  This topology is applicable to the INA138,INA139,INA168, and INA169.

  • Hi Patrick,

    Thanks for the apps note and it is very useful, I will ask the customer to follow the circuit. 

    Best Regards,

    Wei-Hao