I am designing a board using the UCC28019A,
I saw an example of the layout on the EVM and some points on the datasheet.
The EVM uses a 2 layers PCB while my PCB is 6 layered.
The stack up of the layers is usually:
L1 - components + traces + ground plane
L2 - GND
L3 - traces (signals)
L4 - Power
L5 - GND
L6 - components + traces + ground plane
In that configuration I always have an adjustment ground plane next to either a power or a signal plane to produce a return path.
I can follow the example of the EVM, putting most of the components on the top layer and the SMD parts and trace on the bottom layers.
My questions are:
1. Should I mirror the bottom layer to all other layers or at least to the ground layers?
2. Should I only mirror the ground planes to the ground layers?
3. Leave the power plane under the PFC section blank?
4. Can I use the signal layer for traces such as JP2 - which in the EVM is a wire jumper?
Any other considerations I should take into account?