Tool/software:
Hello,
So I have designed my board using the LMG3422EVM-043 as a reference.
Here are the design files.
1538.Schematic.pdfFinal data_rev 7.zip
I am providing a complimentary 1MHz PWM at 28% duty cycle to the HS and LS fets.
I have an external 12V DC supply to power the aux circuits and see the 5V circuits work as intended.
I am slowing ramping the input voltage from 0 and see the output voltage (at no load) also increase proportionally. But when I increase past 150VDC input, the converter starts skipping cycles and the output starts oscillating.
My first thought after reading a lot of these comments in the forum is that maybe I am driving the fets too hard, and I should maybe try decreasing the slew rate by changing R5 and R14 to 70K Ohms.
Could you recommend anything else that I could try? I can share the switching waveform tomorrow for more detail.
Thank you for your time and support!
