Re: Master power switch for E-bike ideas
Yeah pretty much your observations are correct. And you probably don't need to technically worry about most of the SOA graph, because it was meant for people PWMing. Same with capacitance - it's for PWM. If you're only using it as a bulk on/off switch you only switch every few minutes, you only need to deal with continuous (DC) ratings.
And yes these are real devices, there are always tradeoffs when you make MOSFETs. Sort of these four items: high voltage, high current, low capacitance, low price, PICK TWO. Not three, TWO.
(Technically capacitance and price should be directly correlated as an unfortunate side effect, so maybe you can take out one of these two. And then again higher voltage or current are also necessarily increases price.)
Yeah pretty much your observations are correct. And you probably don't need to technically worry about most of the SOA graph, because it was meant for people PWMing. Same with capacitance - it's for PWM. If you're only using it as a bulk on/off switch you only switch every few minutes, you only need to deal with continuous (DC) ratings.
And yes these are real devices, there are always tradeoffs when you make MOSFETs. Sort of these four items: high voltage, high current, low capacitance, low price, PICK TWO. Not three, TWO.
(Technically capacitance and price should be directly correlated as an unfortunate side effect, so maybe you can take out one of these two. And then again higher voltage or current are also necessarily increases price.)
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