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LM5148: severe heating on the upper tube

zhang ping
Genius 3835 points
Part Number: LM5148
Other Parts Discussed in Thread: LM5149

Tool/software:

LM5148， Input 28V, output 12V, operating frequency 520K, currently Iout 14A, severe heating on the upper tube, reaching over 100 ℃. The driving waveform between the upper tube GS is shown in the following figure Qg@4.5 It is 4.5nC with a conduction impedance of 4.7m. Do you have any suggestions to help us improve the heating situation of the upper tube;