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Ligne 132 :
Ligne 132 : − The A4988 driver IC has a maximum current rating of 2 A per coil, but the actual current you can deliver depends on how well you can keep the IC cool. The carrier’s printed circuit board is designed to draw heat out of the IC, but to supply more than approximately 1 A per coil, a heat sink or other cooling method is required.+ − + − − '''Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current'''. Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be quite a bit lower than the coil current (the driver and coil basically act like a switching step-down power supply). Also, if the supply voltage is very high compared to what the motor needs to achieve the set current, the duty cycle will be very low, which also leads to significant differences between average and RMS currents.
→Dissipation de chaleur
== Dissipation de chaleur ==
== Dissipation de chaleur ==
Le circuit intégré A4988 support un courant maximum de 2 Amp par bobine, mais le courant que vous pouvez vraiment délivré dépend principalement de l'efficacité du refroidissement du circuit intégré. Le carte est conçue pour évacuer la chaleur aussi efficacement que possible mais si vous voulez fournir un courant d'environ 1 Amp par bobine il faudra prévoir un dissipateur de chaleur et/ou autre méthode de refroidissement.
{{ambox|text=This product can get hot enough to burn you long before the chip overheats. Take care when handling this product and other components connected to it.}}
{{ambox|text=Ce produit peut devenir suffisamment chaud pour vous bruler longtemps avant d'entrer lui-même en état de surchauffe. Restez prudent lorsque vous manipulez ce produit ou d'autres composants connectés sur celui-ci.}}
== Ressources ==
== Ressources ==