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KUKA 390-00240-0
假设为1756-HSC输入端子提供5 mA电流,则现场接线臂端子之间 需要多大的电压?如前所述,Vdrop大约为1.6V。而4mA电流流经 150 Q电阻产生额外的0.60V压降。因而,在两个端子之间提供 大约(1.6 V + 0.60 V) = 2.20 V电压,使流经光电二极管的电流为4 mA。 当Vcc = 5 V且25 °C(77 °F)时,75114提供大约3.3V的电压。这样可以 知道该驱动器引发的电流要低电流要求4 mA大。
可使用下面的等式确定电流的大小:
Vdrive - Vdrop = Vresistor
3.3 V - 1.6 V = 1.7 V 1.5 V/150 Q = 11.3 mA
如您所见,1.6Vdrop过低。
请记住,随着If在4...8mA范围内变化,Vdrop在大约1.6V至2.0V范 围内作线性变化。假设Vdrop = 2.0 V,重新计算。
Vdrive - Vdrop = Vresistor
3.3 V - 2.0 V = 1.3 V
1.3 V/150 Q = 8.7 mA
计算结果8.7mA与我们假设的“If = 8 mA时,Vdrop = 2.0 V” 一致。这说 明驱动器75114可以使大约8 mA电流流经光电二极管。
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KUKA 390-00240-0
KUKA 390-00240-0
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