UCC28180: PFC BOOST CONVERTOR

Hi Deepak,

I believe Danilo posted the same question in another E2E thread. I've assigned this to our PFC expert, but I will pre-empt by asking about the probing methodology:

1. Where exactly is this being probed?  I assume this is the gate to ground, but is it at the MOSFET or at the controller or somewhere else?

2. Are they using tip-and-barrel probe technique? If not, this is what you would see if using the long ground wire found on a standard probe. In this case, the spike doesn't exist at the probe points, but rather between the probe tip and the end of the ground wire (inductor).

To make these types of transient measurements, it's important to minimize the ground loop by utilizing tip-and-barrel probes directly on the point of interest and the closest possible ground reference. Right on controller pins 8 & 1, or on the MOSFET pins 1 & 3.

This is a good explanation: https://www.cui.com/blog/how-to-measure-ripple-and-transient-in-power-supplies

Regards,

Ray