i planning to use 8 no of parallel nmosfet to switch 600a 80v from battery to load by this nmosfet(100v 300 amps rated mosfets).i need some suggestions

 

this nmosfet

Which MOSFET?

 

https://www.digikey.in/en/products/...0S5N015TATMA1/13996713?utm_source=chatgpt.com

 

What is the switching frequency?
Is the load inductive?
What will control the switching?
What heatsink arrangements?

 

What are you using for a heatsink?

 

500A and up + 100V to 150V Here is two pages of MOSFETS.
The parts with the 4 bolts, I have used on PCBs.
The TO-??? through hole parts work well.
The surface mount, some heatsink to a heatsink on top and some to the PCB.
I have not used the Aluminum PCBs but think they will heatsink very well.

 

I would also recommend the 4-bolt devices and use them with heavy wires and/or busbars.

Thermal management will be a challenge. The after mentioned aluminum PCBs don’t have the required thickness to spread the amount of heat quickly enough. It should be mounted directly into a thick heat sink.

 

I would be surprised if you could get enough copper in the right place on an aluminium board. I would recommend a standard FR4 board, and get everything to screw terminals with the shortest widest track possible.

 

I would be surprised if you could get enough copper in the right place on an aluminum board.

We use FR4 and just use copper for heatsink. I would think adding Al to the board would help.

The 4 bolt MOSFET works with PCB but I use 4 or 6 layers in parallel. I do not use traces for high current but use "area fills" of copper. That area of the PCB might be 90% filled. It is possible to combing busbars on top of the PCB.

 

And last but not least……
Don’t forget to add a DC rated fuse. Expensive, but an electric fire is usually more expensive.

 

fuse

fuse

 

With even just 100 amps on a PC board, the voltage drop is going to be a problem, as will the heat. In addition, the heat produced while passing thru the linear mode is going to be a problem in itself.
None of these will make the project impossible, but they all will need to be considered and the numbers understood before the actual hardware is built and powered.
The other part is driving the gate: the charge needs to be supplied quickly and removed quickly. Certainly there are gate driving schemes that work at those power levels. but they are a bit different from the simpler ones.

 

These are handy (and cheap). They are meant to be the commoning bus bar for MCBs in a distribution board and are rated at 100A, but you can solder them to a pcb.

 

Depending in the switching frequency, the gate driver(s) could be challenging.

 

Really, the gate drive power will probably be the limiting part of the project. Certainly it will limit the switching frequency. And very certainly it will be demanding on the gate driver circuit.

AND it has been over three weeks since the original post. Did we lose the thread starter??

 

Most likely he consulted an AI engine who gave him a straight reply without having to answer so many questions.
That the solution may not be wholly accurate or that it glossed over important details, is not an issue.

So, yeah.

 

Most likely he consulted an AI engine who gave him a straight reply without having to answer so many questions.
That the solution may not be wholly accurate or that it glossed over important details, is not an issue.

So, yeah.

Quick responses to complex questions, given without adequate understanding of the context, may be somewhat less accurate. "Glossing Over those pesky details" allows much quicker responses.