Well obviously if you can't find an SSR with a low enough ON resistance for your requirements, then you would need to do something different.I meant, higher than a discrete MOSFET...
dick_freebird,
I didn't understand this statement: "stiff power supply on the load side".
For both solutions I can have a weak microcontroller signal actuating the switch...With the 3 discrete component solution the uC will actuate the isolated pre-driver wich will then actuate the power MOSFET. Where is the need for the stiff power supply ?
Why can't the MOSFET driver be supplied from the same power source as the power MOSFET itself ?
So, when designing a high current switch circuit for motor control.
Are there any good reasons not to use an SSR instead of 3 discrete components (driver/power mosfet/opto isolator) ?
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