How to enhance interference immunity of motion controller MC output drive

Enhancing the noise immunity of the motion controller's MC output driver requires strengthening its ability to resist power supply and ground noise. Sufficient decoupling capacitors, including large-capacity energy storage capacitors and multiple small-capacity MLCCs, should be placed on the power supply pins of the driver chip. Ferrite beads should be used to isolate the driver chip's power supply from the digital logic power supply. Adding a small resistor or ferrite bead in series on the driver output pin can not only mitigate edge noise and reduce radiation but also limit injected transient current.

For inductive loads, a freewheeling diode must be connected in parallel across the load, and the diode should be placed close to the load. Isolation techniques, such as using optocouplers or isolated drivers, should be employed to separate the control side from the power side ground, blocking ground noise conduction. The PCB layout should be optimized to minimize the drive loop area. The effectiveness of the enhancement measures should be verified by injecting EFT, surge, and other interference to test whether the output driver malfunctions or is damaged under noise conditions.