Hi,
there are dedicated power switches for this purpose.
Or:
You may use a bipolar PNP type transistor instead of the MOSFET. It doesn´t suffer from the internal diode.
Or:
you may use a series schottky diode with the 5V output path.
Klaus
What other parameter should I consider for this application?
If you are always have 5V and 14.8V available and always want one or the other on, then just reverse the source and drain of the 5V MOSFET.
The way it will block the 14.8V but still allow the 5V to be turned on (since MOSFETs conduct equally well in either direction when on).
But note that the 5V will now come through the substrate diode when both voltages are switched off.
If that's a problem and you want to turn both supply outputs off at the same time, then use two MOSFETs in series connected source-to-source (with 100k from the sources to the gates) for the 5V supply. That will block in both directions since the substrate diodes are now back-to-back.
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Read posts#4 and #6.Can you suggest any cheaper MOSFET instead of this?
Hi,
Read posts#4 and #6.
The forum and it´s members are worldwide. A low cost device in Europe, Africa or USA isn´t necessarily cheap and available in your country.
A forum isn´t meant that others do your job. But the people will help you to do your job.
Klaus
Where do you live and who can you order parts from?I will try this two MOSFET in series. I am using FDD4141. Can you suggest any cheaper MOSFET instead of this?
Where do you live and who can you order parts from?
With FDD4141, when Input source is 14.13V the output power is 13.17V and Current 1.11A. This is casing the problem.
Anything's possible, but we can't tell without more info..........
Is it possible that this problem occurs due to inability of Voltage source to supply required current or load drawing more current? or Is it a problem of MOSFET?:
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