[Milsurplus] [Boatanchors] Two 400 Volt MOSFETs Equal...

[Bob Camp]

Hi

You would also need to match them for switching characteristics. If one turns on or off much faster than the other one, they aren’t going to share the voltage.

There’s also the side issue of running a 400V part at 400V. You probably should allow for a bit of “bounce” in the wiring if nothing else….

Bob

On Nov 22, 2013, at 7:27 PM, Ian Wilson <ianmwilson73 at gmail.com> wrote:

> The voltages across the two series devices will split according to the
> ratio of the leakage currents through each device. So if the devices
> are well-matched* then you can double the standoff voltage of a single
> device. Prudence would suggest a 50% derating, so you could stand
> off 600V with two 400V devices in series.
> 
> 73, ian K3IMW
> 
> * well-matched = not an eBay "matched pair" :)
> 
> 
> 
> On Fri, Nov 22, 2013 at 4:03 PM, David Stinson <arc5 at ix.netcom.com> wrote:
> 
>> If I put two 400-Volt D-S MOSFETS in series,
>> do I get a MOSFET good for 800 Volts D-S?
>> Driving the gates with seperate buffers.
>> 
>> 
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