UC1517
UC3517
Experimental selection of RT and CT allow the designer to se- tion can be well controlled. Average power dissipation for the
lect a small amount of winding current overshoot, as shown driver and motor must be considered when designing sys-
above. Although the overshoot may exceed the continuous tems with intentional overshoot, and must stay within conser-
rated current of the winding and the drive transistors, the dura- vative limits for short duty cycles.
Figure 7. Effects of Different RT & CT on Bilevel Systems
In this application, the A and B outputs of the UC3517 are also allows half-step operation of the UC3717. Peak motor
connected to the current program inputs of the UC3717. This winding current will be limited to approximately .42V/R1 by
allows the UC3517 inhibit signal to inhibit the UC3717, and chopping.
Figure 8. Interface to UC3717 Bipolar Driver
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TI [ TEXAS INSTRUMENTS ]
