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AFE3010-EVM: ABOUT monitor DC 6mA leakage current issue

Lawrence He
Genius 3115 points
Part Number: AFE3010-EVM
Other Parts Discussed in Thread: AFE3010

Hi, Support Team

We are working on AFE3010EVM to generate Ground fault Current interrupt.

and we find AFE3010-EVM cannot monitor  DC 6mA leakage current?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Mastermind 32395 points

    Hey Lawrence,

    I am looking this over and will respond shortly.

    Sincerely,

    Peter

  • 0 in reply to Peter Iliya
    TI__Mastermind 32395 points

    Hey Lawrence,

    The AFE3010 can detect a 6mA DC leakage. It would trip the same way a 5mArms (AC or rectified) fault would be detected.

    The only stipulation is that the AFE3010 essentially needs two things (depending upon the application):

    1. AFE3010 needs a clock (50-70Hz, 50% duty cycle) at PH and SCR_TST pins. Trough needs to be <=0V and peak >= 20V. Depending on how large the troughs and peaks are, you may need the 1MOhm current limiting resistor into the PH and SCR_TST pins.

        - This is normally supplied by simply pulling up PH pin to LINE voltage with 1 MOhm resistor. There are internal clamps to GND and VDD inside the device.  If the SCR self test is turned off (SEL=floating), then you can do the same thing with the SCR_TST pin. However, if you do want the SCR self test feature (SEL=GND), then you would connect circuit as shown in datasheet.

    2. AFE3010 needs a 20V DC supply at VDD pins. This is normally accomplished by using a AC to DC rectifier from line voltage.

    Sincerely,

    Peter