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In motor systems, voltage spikes and ringing noise can appear on the output terminals. These spikes can degrade the performance of the motor system, increase EMI noise, and even cause damage if not controlled.
Switch-node ringing noise is the results of fast slew rates at the output terminals of the motor system. Having a fast slew rate effective means having large dV/dt which can cause significant LC oscillations between the parasitic inductance of the PCB traces and the parasitic on the MOSFET package. The diagram below shows the typical parasitic components of a half-bridge.
This switch-node ringing not only creates voltage undershoot and overshoot which can be damaging to the motor system but can also cause high EMI noise. Controlling these switch-node oscillation is important to improve the performance of the system. Below are a couple solutions for reducing switch-node ringing:
Large current flowing back to the power supply can also cause voltage spikes at the output terminals of the motor systems as well as on the power supply. The excess current can be produced by the motor acting as a generator or by the stored energy on the motor flowing back to the supply during fast decay (read this app-note to learn about the different decay modes). There can also be other unexpected sources that can cause excess current to flow back to the supply. The best way to minimize these voltage spikes is to control and absorb all of the excess energy. Below are some techniques to minimize these unwanted voltage spikes:
Regards,Pablo ArmetMotor Applications Team
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