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PMP21639: thermal image

Part Number: PMP21639
Other Parts Discussed in Thread: UCC28780


I want to know parts location of the thermal image especially LMG3411 and UCC28780 placement at 90VAC, 50Hz input, 20V,3.25A output case presented in page-7, page-8 for my better understanding of how LMG3411 become hot. Is Bx4 thermal image in page-8 LMG3411 ? 

Best regards,