I would build my first flyback converter.

Converter would be designed for 2A max and load device would draw about 100-200mA for most of the time with 1.8A peaks. Peaks would take a little longer so I can’t just use smoothing capacitor.

How should I select primary inductance?

Usually it is selected for changes in switch current to be 50% of max primary current. If I do the same and calculate inductance for my max current that way, current changes would be much bigger then actual current when load is 100mA only. Is it some big problem?

  • \$\begingroup\$ Primary inductance doesn’t depend on secondary current but secondary power under load. It also depends on primary dc voltage and switching frequency. \$\endgroup\$ – Andy aka Mar 3 at 14:18

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