Vef and the two current limiting pins are part of that chopper feature - a safety shut down. There is an internal 'chopper' feature that requires an external oscillator. And you have to provide the oscillator circuit anyway. And do you want to or not? If not, you have to do some electrical engineering to get the current sense and the Vref to work together. Can you just forget using current regulation on the 'chopper' circuit? I don't really know. The L297 is a bit more complex that the average device. The excess current won't be consumed because the internal resistance of the motor is high enough to limit the current (at the right voltage - if go to a higher voltage, things change). Having a device that will supply 2amps and a motor that will consume substantially less is usually no real problem. In that case, the motor coils would burn up. But in this case, you will have to read both the L297 and L298 PDFs and look around for circuit examples of both chips being used together.Īnyway, you generally only need to limit the current, if the power supply can provide more current than the stepper motors and all the related circuitry can handle. I know it can be difficult to get started with them, and so I am trying to read the PDFs for you as I write. It is always helpful to read the PDF and documents. But using external current limiting resistors on chips are always an option to safe guard important components. It sounds as if Franklin is guessing a bit. Minimum current? It would have to be zero - think about it.
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