Buck-Boost Converter Operation and Voltage Equation

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Here, we introduce the buck-boost converter topology and it's two switching operation modes. We derive the relationship between the input voltage, average output voltage, and active switch duty ratio.
[updated version of a previous video]
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Thank you for the video. Would you please also introduce buck-boost with positive voltage output?

yutinghe
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When dropping the voltage from 9 to 3 volts and the power supply is rated for 9 volts 1 AMP, am I limited to 1 amp at 3 volts or do I have 3 volts 3 amps?

bannana