Hi,
Don't people place RC or RCD snubbers around transistors and diodes to deal with spikes?
Are you using a 10:1 probe with a short ground lead from the probe to the converter ground?
Then set it to 10X and see if that makes a difference.Probe was set to X1
Consider that wiring inductance of your PCB is sufficient to create the observed switching noise.
Look at the commutation loop marked in yellow, it comprehends a long ground trace between input capacitor and output diode. A respective voltage transient is induced in this trace by the switched current. With small layout changes, the ground trace can be extended to an almost massive copper pour.
View attachment 165476
Hi,
I fully agree with FvM.
And if the big resistor is wire wound... it will kill your Mosfet sooner or later..
The design can't fulfill EMI reqirements ... with unknown effects on devices nearby.
Klaus
Sorry, cap from supply to the fet drain to find...
--- Updated ---
... to gnd ...
yup, you need an input ripple current supplying cap directly from the drain to gnd,
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