Criteria to select IGBT and Diode for buck converter help!

Thread Starter


Joined Dec 23, 2017
Hello peeps!

I am in the part of the design process where I must select the switching devices for a buck converter: transistor (I am biased with choosing an IGBT for my specific design application) and diode (preferably a Schottky diode). I am bit, or better said, quite confused about the selection criteria I must follow to better fit the components in my circuit. Hence, my question relies on: What are the operational criteria I must consider while selecting the proper IGBT and diode capable of complying with my buck converter demands?
Important info about this buck converter design:
Vin: 120 Vdc
Iout: 85.5 A
Vout: 48.2 V (approx)
Switching frequency: 27000 Hz

Please let me know if additional info is required. I honestly need a guide that explains which Electrical specs I must consider or calculate to select the components.

Thanks indeed to all.


Carmen S.


Joined Aug 21, 2008
The primary considerations are the peak current and peak voltage and operating frequeny. After selection of the device you can then design the drive circuit.