you gave very valuable information by explaining "spiritual effect" Most of technical people were skipping that part as it was coming from the manufacturing structure of MOS.
4:01 "You're safe" - Meaning? That was the key information i came to learn, and you didn't say it. Does safe mean, no heatsink needed? Or, any current or voltage over the safe line, even with a heatsink, will kill the mosfet? Or...?
Hey @johnaweiss, We checked with one of our engineers and received the following response - If you operate under the SOA lines you are safe, means for a given VDS voltage, and a given pulse (DC to 10us) if the current you select happens to be below the line, the MOSFET will operate safely. The graph given is 25C at PCB, provided this is maintained, whether through heatsink or other cooling method, the capability shown is valid. We hope this answers your question. Have a great day!
so I cannot use the MOSFET in DC mode like a variable resistance even with the power rating. I only found out lately that the BJT or IGBT is more controllable in DC as variable resistance because they have higher impedance than mosfet
As per SOA curve it looks like the MOSFET Can handel very fewer AMP compare to Max raring, when used as relay for Battery management system ? Or if it is coolant is managed then it shall be used till Max rating?
Thanks for the question @thayalans4047. Max rating referred to are based on steady state conditions, meaning MOSFET is fully enhanced (current though RdsON), while SOA refers to linear mode, and the MOSFET is in its switching transition mode - different dynamics take place, hence the current capability is different.
you gave very valuable information by explaining "spiritual effect" Most of technical people were skipping that part as it was coming from the manufacturing structure of MOS.
Thank you, Stein will be happy to hear this.
4:01 "You're safe" - Meaning? That was the key information i came to learn, and you didn't say it. Does safe mean, no heatsink needed? Or, any current or voltage over the safe line, even with a heatsink, will kill the mosfet? Or...?
Hey @johnaweiss, We checked with one of our engineers and received the following response - If you operate under the SOA lines you are safe, means for a given VDS voltage, and a given pulse (DC to 10us) if the current you select happens to be below the line, the MOSFET will operate safely. The graph given is 25C at PCB, provided this is maintained, whether through heatsink or other cooling method, the capability shown is valid.
We hope this answers your question. Have a great day!
so I cannot use the MOSFET in DC mode like a variable resistance even with the power rating. I only found out lately that the BJT or IGBT is more controllable in DC as variable resistance because they have higher impedance than mosfet
As per SOA curve it looks like the MOSFET Can handel very fewer AMP compare to Max raring, when used as relay for Battery management system ? Or if it is coolant is managed then it shall be used till Max rating?
Thanks for the question @thayalans4047. Max rating referred to are based on steady state conditions, meaning MOSFET is fully enhanced (current though RdsON), while SOA refers to linear mode, and the MOSFET is in its switching transition mode - different dynamics take place, hence the current capability is different.
I accidentally confirmed it in an experiment. It was just like the engineer said
thank you very much