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Original question:

AMC1350: Precision voltage and current monitor

AMC1350: AMC1350

Zsolt Danyi
Prodigy 160 points

Part Number: AMC1350
Other Parts Discussed in Thread: INA290

Dear Support Team,

I would have a partially connacted question. Would it be somehow possible to detect short circuit using one of above meantioned chip (INA, AMC, LMP etc)?

Thank you very much in advance.

Zsolt

  • 0
    TI__Guru 57662 points

    Hi Zsolt,

    Yes, it is possible to detect a short circuit in the system with an AMC device. You can size the shunt/sense resistor such that the maximum nominal current/voltage only uses a portion of the input voltage range and the expected short circuit current/voltage matches the maximum input voltage range or the clipping voltage. 

    If the short occurs at the shunt/sense resistor, that will be more complicated however. A short at the shunt resistor for a current measurement will result in the current flowing through the device, potentially causing damage. A short at the sense resistor for a voltage measurement may cause damage as well, however the high input impedance of a voltage sensing device should prevent significant current from flowing. 

  • 0 in reply to Alexander Smith
    Prodigy 160 points

    Hi Alexander,

    Thank you for your reply, actually thats exactly what I did. At the output ot the current sensor in my case an INA290, I use a comparator which gives me 0/1 if the sensor voltage is above a certain level. My uncertainty comes from the fact of a short, in this case the voltage goes to zero but the current goes to infinity. So on the shunt resistor, there is 0 volt voltage drop therefore i cant detect short, or am I missing here something?

  • 0 in reply to Zsolt Danyi
    TI__Guru 57662 points

    Hi Zsolt, 

    Are you experiencing a short-circuit current issue with a circuit that you have produced or are you at a schematic level and trying to understand what it's behavior will be during a short-circuit? 

    If the short circuit current is flowing through the shunt resistor, a voltage will be realized on the input pins of the INA.