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Duty Cycle
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Inductor Value
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Average Input Current
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Peak Inductor Current
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Current Ripple
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Input Power
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A buck-boost converter is a DC-to-DC switching converter that can either step up (boost) or step down (buck) the input voltage. In inverting topology, it produces a negative output voltage with respect to ground.
The duty cycle for an inverting buck-boost converter is calculated as D = |Vout| / (Vin + |Vout|), where Vout is the desired output voltage and Vin is the input voltage.
The inductor value depends on the switching frequency, current ripple requirements, and operating conditions. Higher switching frequencies allow smaller inductors, while lower current ripple requires larger inductors.
The inverting buck-boost topology inherently produces a negative output voltage because of how the inductor and switch are connected. The output is referenced to the negative terminal of the input.
Efficiency depends on switching losses, conduction losses in the MOSFET and diode, inductor resistance, and operating duty cycle. Buck-boost converters typically have lower efficiency than buck or boost converters alone.
Higher switching frequencies allow smaller passive components but increase switching losses. Common frequencies range from 50kHz to 500kHz, with 100-200kHz being typical for many applications.
Current ripple is the variation in inductor current during switching cycles. Lower ripple reduces output voltage ripple and stress on components but requires larger inductors.