Smps ripple current definition

[sahko123]

I'm currently designing a 120ish watt smps for which I a tiny transformer (only for a micro and the smps controller) in calculating the inductor value I need the ripple current through it.

Would the ripple current be defined as the largest peak to peak current draw of the power supply, roughly 5amps pk to pk for a 24v output for a 340vdc input, since the load is a pwm controlled soldering iron (jbc t245). So do I take 5amps as the pk to pk ripple current through the inductor?

[Terry Bites]

See this handy App note from TI https://www.ti.com/lit/pdf/slva477?keyMatch=BASIC%20CALCULATION%20OF%20A%20BUCK%20CONVERTERS%20POWER%20STAGE

[bson]

It's the standard deviation.

[TimFox]

Otherwise known as the rms value of the varying component.