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.

Output current (A)

Required number input.

Duty cycle

Optional number input.

Input capacitance (uF)

Required number input.

Switching frequency (kHz)

Required number input.

Compute buck converter input ripple voltage as Iout x D x (1 - D) / (C x f). 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]

Input ripple voltage (V)

The resulting input ripple voltage returned as a number.

• Power-supply ripple, hold-up, inrush, efficiency, and loss calculations depend on line range, load transient, switching mode, capacitor bias and ESR, rectifier conduction interval, control limits, temperature, and component tolerance. Safety, stability, EMI, and fault behavior require separate verification.
• 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.

• Input Cap RMS Current

  Compute buck converter input capacitor rms current as Iout x sqrt(D x (1 - D)).

• Output Ripple Buck

  Compute buck converter output ripple voltage in the ESR-less form dI_L / (8 x f x Cout).

• ADC LSB Voltage

  Calculate one ideal ADC code width as full-scale input span divided by 2^N. Full-scale span is the high-to-low range, not necessarily the reference voltage for every ADC topology.