Design of isolated PSU issue with High Side Drivers


Thread Starter


I am using the following IC: IRS2453DSPBF from infineon to drive a full bridge on the primary side of a small transformer. The issue I am having is when testing the full bridge in isolation no connection to a load of transformer, the high side drivers are not behaving as expected. Attached is the schematic I am working with if anyone could point perhaps anything obvious that was missed that would be greatly appreciated. The objective is to create two small individual +15V isolated supplies.
Try to load the bridge. For example, you can make it so that there is no idle current, add load resistors. Or bypass the capacitor with a 1µF resistor.
What prevents you from simulating in LTspice? What do you miss? I will help.