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Measurement of primary side Vds-Id of SMPS

Measurement of primary side MOSFET voltage and current.

The photos below are a photo of the measurement and a circuit diagram.
Cut the copper foil pattern and measure the current using a current probe.
A current probe with a bandwidth of 50MHz is recommended.
For voltage waveform measurements,
Please use a probe with a bandwidth of 200MHz or more at 100:1 as shown in the photo.


The photo below shows the drain-source voltage and source current.
When measuring the drain-source voltage waveform, set the oscilloscope bandwidth to 100MHz or higher.
When using a digital oscilloscope, we recommend a sampling frequency of 1.0GS/s or higher.


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