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LMR54410: Can LMR54410 sink current if output voltage is used as Clamping Voltage Value?

Calin Ciobanu
Prodigy 10 points
Part Number: LMR54410

Is the output of the LMR54410 capable of sinking current? I am using the part to generate 17VDC output at about 250mA. Can I use the 17V output as a Clamping Voltage for a 1kHz to 100Khz communication pulses with the amplitude up to 30V? The signaling is between 0V and 18VDC to 30VDC amplitude. I am planning to clamp using a Schottky Diode and a resistor of 499 Ohm.

  • 0
    TI__Guru 72715 points

    Hi Calin,

    Thank you for posting.  Generally in FPWM the buck circuit can have some sinking capability but it also depends on how fast in rising of the voltage to be clamped. Note that the IC operate based on FB signal, and it rises too fast, the IC may stop switching, leaving the VOUT solely be clamped by your input source through the body diode of the high side FET.  In short this is not a reliable approach.  Anyway, you can test to see it is effective.

    Thanks,

    Youhao