TMC2240 100uF capacitor

Hi Arane,

the TMC2240 operates the motor coils in a chopperd way. That means, supply current is drawn in a pulsed fashion. You have to design your power supply in a way, that it can cope with this. Voltage ripple on the VS terminal caused by the motor chopper should be kept well below 1V. Therefore, our recommendation to put a certain capacitor near the IC is more guessing, as it adds up to other capacitors in the system and supports your power supply. The system power supply normally involves higher capacitance. If the power supply capacitor is not far (i.e. interconnection resistance and inductance are low) the 47µF capacitor or even smaller can be fine. 

Hi Arane,

the TMC2240 operates the motor coils in a chopperd way. That means, supply current is drawn in a pulsed fashion. You have to design your power supply in a way, that it can cope with this. Voltage ripple on the VS terminal caused by the motor chopper should be kept well below 1V. Therefore, our recommendation to put a certain capacitor near the IC is more guessing, as it adds up to other capacitors in the system and supports your power supply. The system power supply normally involves higher capacitance. If the power supply capacitor is not far (i.e. interconnection resistance and inductance are low) the 47µF capacitor or even smaller can be fine.