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Inverting Buck-Boost Duty Cycle Calculator — result sheet
Estimate the duty cycle needed for a negative output voltage in an ideal or efficiency-adjusted inverting buck-boost converter.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Ideal D = |Vout|/(Vin + |Vout|); efficiency-adjusted planning D = |Vout|/(|Vout| + ηVin).
An inverting buck-boost converter can step a positive input up or down while producing a negative output reference. This page reports the ideal continuous-conduction duty cycle and a simple efficiency-adjusted estimate, but keeps controller and power-stage limits outside the arithmetic.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Input voltage — V; minimum 1.0E-6; maximum 1000000
- Desired output-voltage magnitude — V; minimum 1.0E-6; maximum 1000000
- Estimated efficiency — %; minimum 1.0E-6; maximum 100
Worked example
| Input | Value |
|---|---|
| Input voltage | 12 |
| Desired output-voltage magnitude | 5 |
| Estimated efficiency | 90 |
A 12 V input and −5 V target require 29.4118% ideal duty or about 31.6456% under the 90% planning-efficiency estimate.
Assumptions and limits
- The converter operates in steady-state continuous-conduction mode with an ideal switching relationship.
- The efficiency-adjusted duty result is a planning approximation that treats efficiency as a single scalar and does not replace a controller datasheet equation.
- Inductor ripple, diode or MOSFET drops, output ripple, current limits, compensation, discontinuous conduction, and thermal design are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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