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AMC1300: Can the ACM1300 be used to monitor the current consumption of a bipolar high voltage PSU

Gray Thurston
Prodigy 20 points
Part Number: AMC1300

Hello, 

I am working on a design for a +-300v bipolar PSU. I want to include a bidirectional current sense circuit so I an monitor the current of the +300v positive and the -300v negative rail. I was looking at the  AMC1300 to do this because the application section of the datasheet states 

"The low analog input voltage range, excellent accuracy, and low temperature drift make the AMC1300 a high-performance solution for industrial applications where shunt-based current sensing in the presence of high common-mode voltage levels is required" along with the following reference schematics.

However when I look at the operating conditions section the common-mode voltage is listed as –0.16 VDD1 – 2.1 and VDD1 is listed as –0.3 to 6.5. So will this part work? If not can you recommend a current shunt amplifier that will? 

Thanks so much.

  • 0
    TI__Expert 3775 points

    Hi Gary,

    Thank you for your question. While the absolute maximum ratings specify VDD1 between -0.3 to 6.5 V, the recommended operating conditions for VDD1 are between 4.5 to 5.5 V. These are the conditions that the device is functional under. Similarly, the recommended operating conditions for V_CM is -0.16 to VDD1-2.1; which is -0.16 to 3.4. Generally, these typical characteristics designs show a +/-250V for V_INP and INN connected to ground. 

    When you say you are making a +/-300V PSU, what would your analog inputs be? Please let me know.

    Best regards,

    Eva