Power Supply Ripple Calculator

How Power Supply Ripple works

The result comes from ΔV = I ÷ (C × ripple frequency). Power Supply Ripple uses Load current, Capacitance-frequency product to report Ripple voltage. If the next question concerns regulator heat, open Linear Regulator Heat Calculator.

With the loaded values, ripple voltage evaluates to 0.02 V. Change only the quantity being investigated.

Inputs for Power Supply Ripple

Load current and Capacitance-frequency product belong to Power Supply Ripple. Keep source units with load current.

Treat the preset entries as an arithmetic example. Supply measurements or ratings from the actual circuit.

Load current

Example entry: 2 A.

Capacitance-frequency product

Example entry: 100 A/V.

Reading the Power Supply Ripple result

This output represents Power Supply Ripple.

Standard size, duty, temperature, and transient checks remain outside this single equation. Use Transformer Current Calculator as the follow-up for secondary current.

Measurement and units

Check component ratings, isolation requirements, temperature, waveform, and manufacturer limits. Check prefixes on load current. Primary current belongs in the separate Current Transformer Ratio worksheet.

Keep the same electrical reference points across saved cases.

Limits of this calculation

Use capacitance in farads and the correct rectified frequency.

The arithmetic is intentionally narrower than a complete circuit model. Unentered effects remain outside Power Supply Ripple.

A useful Power Supply Ripple comparison

Record ripple voltage before testing a different load current value.

Document the alternate load current source. For ideal buck output, use Buck Converter Calculator.

Questions about Power Supply Ripple