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Part Number: CSD17571Q2
Is there a simple circuit to drive the gate control of an N-channel NexFET like the CSD17571Q2 when used as a 19V/4A load switch?
The on/off control signal is a 3.3V output from a SN74AVC16T245 buffer. The 19V is the highest voltage on the board.
Or would it be simpler to use a p-channel FET?
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In reply to John Wallace1:
Thanks for the response.
After researching the design options some more, I decided it was easier to go with the p-channel option.
Although I hadn't thought of initial current flow at power up. The switched power rail feeds +12V & -12V regulators. They have thresholds before they even start to power up, so I think it will be OK. I will have to check the power-up sequence and behavior after I build the circuit.
The general p-channel design that I am looking at going with is shown below.
I am switching 19V with a 4A max load.
I couldn't find TI FETs that could handle some of the requirements.
In reply to Roger Perry:
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