A Basic Tutorial on the Voltage and Current Waveforms in a Step-Down DC-DC (Buck) Switched Mode Power Supply

Fig1

Topic(s) Covered

Hard switched Waveforms
a. Voltage
b. Current
c. Gate Drive
Step-Down DC-DC (Buck) Switched mode power supplies (SMPS) generally have some basic waveforms associated with them. The premise of a switched mode power supply is to create an inductor current that has a steady ramp[……]

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Transfer function Derived for PWM Switch Model for Flyback(Part 3 of 3 on Must Do’s to Understand a Flyback Output Filter )

AEP3629_Fig2

Benefits to a 2nd Stage LC output filter for flyback:

  • Lower total capacitance needed to achieve output voltage ripple objective
  • Reduce overall footprint of the output filter compared to 1 stage output filter
  • Lower output voltage ripple more dramatically

Problems introduced by a 2nd Stage[……]

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Impedance Reflection Described for PWM Switch Model for Flyback(Part 2 of 3 on Must Do’s to Understand a Flyback Output Filter )

AEP36302_1

Benefits to a 2nd Stage LC output filter for flyback:

  • Lower total capacitance needed to achieve output voltage ripple objective
  • Reduce overall footprint of the output filter compared to 1 stage output filter
  • Lower output voltage ripple more dramatically

Problems introduced by a 2nd Stage[……]

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