Why should buck_boost be designed from the lowest input voltage?

easthewj

Why should buck_boost be designed from the lowest input voltage? [Copy link]

 

Why should a buck_boost with a wide input voltage range be designed from the lowest input voltage?

maychang

It does not necessarily have to start from the lowest input voltage, it is possible to start from the highest input voltage.

Not only this circuit, but other switching power supplies should also be designed from the highest or lowest input voltage.

The highest or lowest input voltage are two extreme conditions. If these two extreme conditions pass, the intermediate conditions can generally also pass.

maychang

The so-called minimum input voltage and maximum input voltage are the boundary points of the input voltage variable (real number). When designing, we always need to examine whether the value of the variable on the boundary can meet the requirements. If both boundaries can meet the requirements, then the intermediate state can meet the requirements. Therefore, the design always starts from the boundary points.

PowerAnts

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PowerAnts

Current stress, inductance determination, voltage difference