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PWM circuit to control hydraulic proportional valve

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IDEngineer:

--- Quote from: NiHaoMike on August 03, 2020, 11:31:33 pm ---if the valve assembly is located in a separate module from the control system, going from 3 wires in the cable to 2 can be quite significant.
--- End quote ---
In this case, the Hall switch that detects RPM will be on the same PCB as the MCU and valve drive circuitry. One small PCB, mounted under the shaft with its integral magnet. So the valve will be physically right next to the PCB and there's little savings in cable length to enjoy.

Circlotron:
Maybe a plain old UC3843 SMPS PWM current mode controller driving a single mosfet might be the answer. It does work with peak current, not average though, so whether that makes a difference. https://www.ti.com/lit/ds/symlink/uc3843.pdf?ts=1596503627351&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FUC3843

NiHaoMike:

--- Quote from: IDEngineer on August 04, 2020, 12:49:54 am ---Possibly also a smaller NFET to improve gate drive on the larger transistor, though at these frequencies one of the beefier MCU I/O pins may still yield decent edges.

--- End quote ---
At such a low frequency, you should be able to just use some logic level MOSFETs.

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