David_
Advanced Member level 2
Hello.
I am reading about paralleling MOSFET's and all the application notes is entirely focused on using MOSFETs to allow the circuit to pass higher currents, but I have a application in which the amount of current can be handled by a single device.
But I would want to use 2 MOSFET's instead of 1 to lower the heat dissipation and to split the heat source into two locations on the PCB (it is SMD devices), but I wonder if this use is viable?
The current to be passed may be as high as 40A and the RDSON of the MOSFET is approximately 1,43mΩ(I am not at all sure at what temperature the circuit will operate since my application is quite odd and the converter will not operate continously, but that 1,43mΩ is based on an assumed junction temperature of 100°C).
There are aspects of the circuit that makes it impossible for me to calculate the temperature but because the lower the temperature the better I am considering to use 2 such 1,43mΩ MOSFET's instead of 1 but I am not sure that this is a valid action to take.
The single MOSFET will dissipate(if operating the circuit at it's maximum) 2,22W and if we assume that the cost of another MOSFET isn't a problem then will I gain anything from using 2 instead of 1 MOSFET?
I think is is at least plausible that 1 MOSFET is sufficient to the point that another MOSFET is simply overkill but I would like to ask someone whom has any experience of this sort of things.
Regards
I am reading about paralleling MOSFET's and all the application notes is entirely focused on using MOSFETs to allow the circuit to pass higher currents, but I have a application in which the amount of current can be handled by a single device.
But I would want to use 2 MOSFET's instead of 1 to lower the heat dissipation and to split the heat source into two locations on the PCB (it is SMD devices), but I wonder if this use is viable?
The current to be passed may be as high as 40A and the RDSON of the MOSFET is approximately 1,43mΩ(I am not at all sure at what temperature the circuit will operate since my application is quite odd and the converter will not operate continously, but that 1,43mΩ is based on an assumed junction temperature of 100°C).
There are aspects of the circuit that makes it impossible for me to calculate the temperature but because the lower the temperature the better I am considering to use 2 such 1,43mΩ MOSFET's instead of 1 but I am not sure that this is a valid action to take.
The single MOSFET will dissipate(if operating the circuit at it's maximum) 2,22W and if we assume that the cost of another MOSFET isn't a problem then will I gain anything from using 2 instead of 1 MOSFET?
I think is is at least plausible that 1 MOSFET is sufficient to the point that another MOSFET is simply overkill but I would like to ask someone whom has any experience of this sort of things.
Regards