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Stepper Motor ULN2003 Internal Diagram And Equivalent Circui

2016-09-03 22:05  
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Stepper Motor ULN2003 Internal Diagram And Equivalent Circuit
In practice general driving channels is more than one. But using the discrete circuit shown in the picture will get large volume. So in many cases it always uses ready-made ICs for multi-channel driving. Commonly used small type stepper motor driving circuit can be ULN2003 or ULN2803. This book's auxiliary experiment board uses the ULN2003. ULN2003 is one of the high-voltage large-current darlinton transistor array series products. It features high current gain, high working voltage, wide temperature range, high loading capacity and so on. So it is adequate to many kinds of high-speed large-power driving systems. The ULN2003A is made up of 7 groups darlinton transistor arrays and corresponding resistances network and clamping diodes network. It has the load capacity of driving 7 groups at the same time. It is a single-chip bipolar large-power high-speed IC. The ULN2003 internal structure and its equivalent circuit is shown in the picture.