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UCC28811: Reference design PMP6024A start up circuitry overheated

Part Number: UCC28811
Other Parts Discussed in Thread: PMP6024


Hi there,

I have build a prototype based on the PMP6024 and the main circuit is UCC28811DR. Unfortunately I have some problem with the start up circuitry. Q1 overheated and burned up when added load on secondary side, the 50V output