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DL24 Atorch type electronic loads: considerations on how to choose the best mosf
Silicium81:
Here is the result of the RDS-on measurement on mosfet ok: 85.4 milli-ohm!
The expected value being 40 milli-ohm, we are indeed in the presence of a fake IRLP260M...
The test circuit used: (I made the simulation display the actual measured values)
elecdonia:
--- Quote from: Filippo52 on January 29, 2023, 07:51:57 pm ---I welcome you to share my thoughts on SOA and linear MOSFETs. Your idea of a resistor bank is very suggestive; but I fear that in the end it would be much more expensive than even the most expensive linear mosfet that solves all the problems with only one component
--- End quote ---
I agree with you. A less costly solution is to provide a modest selection of fixed high-power resistors to place in series with the MOSFET load tester.
Example:
Testing 48V power supply with 10A load current.
480W total dissipation.
Place 4 ohm high-power resistor bank in series with MOSFET load tester.
Connect + voltage sensing input of MOSFET load tester to high end of 4 ohm series resistor
This permits load tester to measure total voltage drop for calculating Watts
40V across resistor = 400W
8V across MOSFET load tester = 80W
8V across MOSFET should be well within SOA
Filippo52:
okay
but in this way you will have to prepare a type of resistor for each measurement situation, you will no longer have a flexible instrument that is valid in any load situation
Filippo52:
OK Silicium
well done
you are already a Mosfet expert.
Now your hypothesis of replacing all the Mosfets with the same number of originals makes sense.
Just try to find a reliable supplier.
Hello and good job
Silicium81:
Hopefully they will be ok:
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