Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Input voltage (V)

Required number input.

Output voltage (V)

Required number input.

Compute the inverting buck-boost duty cycle percent as |Vout| / (Vin + |Vout|) x 100. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Duty cycle (%)

The resulting duty cycle returned as a number.

• Ideal duty-cycle equations omit switch and diode drops, dead time, ripple, discontinuous conduction, magnetic loss, control-loop limits, minimum on-time, startup, and load transients. Use the converter topology and controller datasheet for a realizable design.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Boost Duty Cycle

  Compute the ideal boost converter duty cycle percent as (1 - Vin/Vout) x 100.

• Ćuk Duty Cycle

  Compute the inverting Ćuk converter duty cycle percent as |Vout| / (|Vout| + Vin) x 100 using magnitudes.

• Flyback Duty

  Compute the flyback converter duty cycle percent as (Vout x Np/Ns) / (Vout x Np/Ns + Vin) x 100.