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Ligne 129 :
Ligne 129 : − {{traduction}}+ − The DRV8825 driver IC has a maximum current rating of 2.5 A per coil, but the current sense resistors further limit the maximum current to 2.2 A, and 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 1.5 A per coil, a heat sink or other cooling method is required.+ − −
→Dissipation de chaleur - considérations
== Dissipation de chaleur - considérations ==
== Dissipation de chaleur - considérations ==
Le circuit intégré DRV8825 qui pilote la carte support un courant maximum de 2.5 A par bobine mais la résistance senseur de courant limite le courant à un maximum de 2.2A. Hormis ces considérations le courant que vous pourrez vraiment utiliser dépend de votre capacité à refroidir efficacement le circuit intégré. La carte est conçue pour évacuer la chaleur hors du circuit intégré mais si vous désirez utiliser un courant approchant ou supérieur à 1.5 A par bobine, vous devez utiliser un dissipateur de chaleur ou autre système de refroidissement.
{{ambox-stop|text=Ce produit peut devenir suffisamment chaud pour vous brûler... même bien avant que la protection de surchauffe ne s'active. Soyez prudent en manipulant ce produit où autres composants qui y sont branchés.}}
{{ambox-stop|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.}}
{{underline|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. Additionally, please note that the coil current is a function of the set current limit, but it does not necessarily equal the current limit setting. The actual current through each coil changes with each microstep. See the DRV8825 datasheet for more information.
{{underline|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. Additionally, please note that the coil current is a function of the set current limit, but it does not necessarily equal the current limit setting. The actual current through each coil changes with each microstep. See the DRV8825 datasheet for more information.