Design of isolated PSU issue with High Side Drivers

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Thread Starter

artemis

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.
 
F
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.
 
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