TOPSwitch output voltage drop
I designed 32V 7A smps using Top261EN. Below I share the test results of the design. There are some issues with smps.
1.) Clamp circuit components overheat, especially tvs diode and clamp blocking diode. I reviewed the AN14 document, if I increase the power of the elements in the clamp circuit, will the problem be fixed?
2.) Output diode is overheating, what should I do to reduce heating. I tried DPG60IM400QB and MBR30200FCT_T0 diodes, they both get too hot even though I have a heatsink installed.
3.) The most important question is, when I connect a load between 3A - 7.5A, the smps components get hot, but there is no problem in its operation. Output voltage drops to 30V at 7.5A load. When I overload, for example, 8.5 A, the output voltage does not decrease, it becomes 30V again, but the topswitch explodes.How can I prevent topswitch explode when overload ? I don't want the voltage to stay constant when overload is loaded, I want the voltage to drop. What should I do to reduce the output voltage in overload?
I attached all documents and test results for Smps desing.
Transformer primary inductance: 250uH
Transformer leakage inductance: 5uH