Body
Hi Ron,
You're right. The attachments don't show up in the group. They appear attached to emails from the group. The one I sent also doesn't appear in the attachments area (https://groups.yahoo.com/neo/groups/EVGRAY/attachments https://groups.yahoo.com/neo/groups/EVGRAY/attachments). . Clicking 'Attachments' above show the attachments containing zero files in the last eight cases. Perhaps there is no more space left for attachments. It is only possible to delete your own attachments. Perhaps this is a job for Kone to look into?
The artwork (PCB layout)
The capacitors should be fast ones meaning low equivalent series resistance (ESR). A good choice would be ceramic capacitors. They're not stable in capacitance value which doesn't matter for decoupling purposes. The capacitance could be 100nF or more. The speed is what matters (low ESR) as they only have to hold the voltage for brief moments. I.e. delivering the power during transients until the wave of energy reaches the capacitor and connected consumer from the voltage supply.
The tracks from the voltage supply first go to the capacitor and then fans out from here to avoid voltage drops along critical tracks. If looking at U1 leg 1 this has the star connection. It would be even better if this was at the terminal of C3 before entering the MOSFET driver U2. It would be preferable for C3 to be able to deliver enough power to charge C6 without too much voltage drop. Thus C3 should be of at least the same capacitance as C6. It also depends on the diode to be able to deliver that current. The also holds for the two other capacitors C2 and C4.
For highest performance a ground plane is placed on the opposite side of the tracks. This makes the tracks behave more like transmission lines of the same impedance which minimizes reflections each time the impedance changes.
I don't know the voltage and current or even if high switching frequency is needed. Just be sure to have proper creeping distances for the voltages used and wide enough tracks for the currents used. Also if the MOSFETs used have high gate capacitance and fast switching is needed then the MOSFET drivers have to be able to deliver high current during charging and discharging of the gate capacitance. Capacitance at high frequency is a good conductor like a short. The output tracks looks narrow compared to the power tracks.
Regards
Ole
---In [email protected], <iron1of1@...> wrote :
I don't see any photo.
Ron
---In [email protected], <iron1of1@...> wrote :
Hi Ole,
I have reworked the board... better?
Ron