Re: [EE]: Synchronising 4 Linear Actuators with 4 x Op Amps and 6 MOSFETS

MOSFETs when "on", conduct to both sides, in practice shorting the diodes.

There is no complementary transistor, both transistors are N-Channel or 
both are P-Channel.

The only condition is that their gates must be at a higher voltage than 
their sources for N-Channel or at a lower voltage in case of the 
P-Channel. Both sources are conneted together and both gates are 
connected to each other.


Cheers,

Isaac



Em 20/04/2025 15:33, Jason White escreveu:
> Those FETs are neat - really easy to design around. I wonder if the 5ms max
> turn on time and a 1ms max turn off time might affect drive speed.
>
> Side question: if those SSRs contain back to back FETs, wouldn't the
> current have to flow through a body diode? (have a forward voltage drop in
> addition to resistive losses) Could they be doing some trickery with having
> both P and N type FETs in the same package?
>
> I guess I really don't know how a FET would get activated by light - I
> suppose it might contain some logic circuitry or something.

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