Industrial electronics
5 things
4 Things About the Buck-Boost Converter
4 things about the buck-boost converter you must know
Quick check · tap an answer to continue
Lesson notes
Key points
- Up or down: It can output a voltage higher or lower than its input supply.
- Vout = −D/(1−D)·Vin: Ideal gain magnitude is D divided by one minus D.
- D = 0.5 is the pivot: Below half duty it steps down, above half it steps up.
- Inverted output: The classic buck-boost gives an output polarity opposite to the input.
Takeaway: Buck-boost: D above 0.5 steps up, below steps down, output inverted.
Quick check: At what duty cycle does an ideal buck-boost output equal input magnitude?
- 0.25
- 0.75
- 0.5
D/(1−D) = 1 only when D = 0.5.
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