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LM5164-Q1: Strange SW waveforms

Part Number: LM5164-Q1

Hi team,

Our customer tests our LM5164-Q1EVM, the input voltage is 60V(CH1), but the SW max voltage is 52V(CH2). Output voltage is 12V and load resistance is 50Ohms. Why SW voltage is lower than input voltage?

  • Hi Naizeng,

    I guess there is some resistance in your input wire, and also the scope measurement result may not be very accurate.

    Check this way: use the same probe with same ground connecting point, turn the scope to 20V/div or 10V/div, horizontal 1us/div, scope sample points 1M points or greater, first measure the Vin pin, and then measure the SW pin.