Temperature Specmanship And Selecting Power Inductors

By Datatronic

How many datasheets have we, as engineers, reviewed and all of the data we need is there? Well, if your experiences are like mine, very few times if at all. And to compound the problem the data listed that pertains to your project was measured at a temperature not where you are planning to run your board.

Choosing the correct power inductor may seem like an easy task. Choose the inductance needed for your SMPS, verify temp rise on the data sheet and your off. But wait. That part is specified for a temperature rise at 25°C. Your board is going to see an ambient temperature of 75°C. Will the inductor you chose work?