The input to my buck converter MOSFET switch is a PWM signal with a certain duty cycle. However, upon observing the voltage waveform of the MOSFET, the voltage is a bit distorted.

The input to MOSFET (PWM signal) and output of MOSFET is observed and pictures are attached.

The first picture is PWM Input to MOSFET (Blue Waveform) and the 2nd picture is MOSFET Output Voltage (Blue Waveform)


**PWM Input to MOSFET**

**MOSFET Output Voltage**

  • 1
    \$\begingroup\$ This is normal and everything is fine. Simply your inductor work in DCM mode, that's all. \$\endgroup\$ – G36 May 2 at 17:47
  • \$\begingroup\$ Actually, I am new to power electronics and I have to write an answer for this question, as to carry out a comparison. So would "The inductor is working in DCM mode" suffice? \$\endgroup\$ – Rango356 May 2 at 17:48
  • \$\begingroup\$ Try read this ti.com/lit/ug/ssqu007b/ssqu007b.pdf page 36 \$\endgroup\$ – G36 May 2 at 18:08
  • \$\begingroup\$ This application report concentrates directly on CCM/DCM operation: ti.com/lit/an/slva057/slva057.pdf \$\endgroup\$ – Jack Creasey May 2 at 18:52
  • \$\begingroup\$ Thank you. The readings helped alot \$\endgroup\$ – Rango356 May 3 at 23:22

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