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Original question:

THVD8000: THVD8000 AC and DC power line communication

THVD8000: Any limitation on DC voltage?

roland van straten
Intellectual 295 points

Part Number: THVD8000

Are there any limitations on the bus voltage like 48, 24 or 12VDC?

  • 0
    TI__Guru 62920 points

    Hello,

    There are a couple of limitations related to voltage that should be considered.

    One is that the DC voltage on the transmission line should not exceed the rating of the AC-coupling capacitance used. (Note too that operation at voltages near the maximum rating can result in a derating of the capacitance, so this should be considered when choosing component values.)

    Another limitation relates to the ramp time of the supply.  Since THVD8000 is separated from the power lines via AC-coupling capacitances, a steady-state DC voltage on the line would not stress the transceiver.  However, fast supply ramps (or "hot plug" events) could result in some voltage transferring through the coupling capacitances and showing up at the device pins.  For higher voltages and faster ramps, it can be beneficial to clamp the voltage at the THVD8000 interface pins using a Zener diode or TVS.

    Regards,
    Max