ups!!!

Well......yes, and it may work...

But Mosfets have a habit of blowing short circuit for no obvious reason.

Ok Darlingtons dissipate more power....

cheers for the reply.

yes, we tink it is quite possible aswell...!!!

ps: so dont you find the pyramids a awesome temple?

they are quite an engineerring achivment.

It's certainly possible - you need to look at the drive circuit to see if it's compatible with a MOSFET. And choose a MOSFET with substantially higher breakdown voltage and power handling capability than you think you need - that will give you a more reliable design.

yes...we get to that conclusion aswell.

tanks for the reply, and have a nice weekend!

Sorry !

Both the devices have quite different Driver requirements.

Darlingtons [Transisitor] is Current-feed device while MOSFET is a Voltage-driven device.

that is transistors need high input power [gain max 10 in a single Power transistor & max 100 in a darlington]

Yes one assumes the questioner knows this..

The darlinglon will be driven via a resitor or potential divider ...and will need about 1.5 v drive...

The mosfet being voltage driven may well be fine as it won't drop any volts through the feed resistor and will probably turn on at about 3 volt (if the right one is chosen).

In other words ....yes it may well work ..

Funny that's what I said initially...

But yes , you may need to mess with the drive circuit...but I'd have thought you'd know that...and check the voltages...and spec's

Del

Regards & thanks

Mosfet drive circuit and darlington drive circuits are very different . So even if it works for few minutes , is not a good engg solution . The drive pulses are lot different.

I would like to know if it is possible to replace a Darlington transistor, from a switched power supply , from a UPS , by a power MOSFET.

The Q doesn't ask if its wise, good engineering, difficult, clever or funny....just POSSIBLE.........

Call me a pedant if you like...

"Hey Del...you're a pedant!"

we tink it will do, cos the voltage divider that was feeding the darlington have enough potencial to trigger a FET.

in any case , the darlington is in the end of a switch circuit, so it was a solution that the original builders projected.

replacing by MOSFET is doable, we gess, as long as we get the right one.

Let us know if it works!

tanks for your interest, and sorry to answer so latelly .

I am not responsable for the project and I was trying to answer to a friend about this.

In any case , the time is for hollidays...wiiiiii:)

we dont see much trouble in replacing the transistors, but there are a lot of if´s since they are microcontroled , so trigger timings must be carefully revised!