In addition to simplifying design problems, a family of dedicatedchips improves stepper-motor drive-circuit reliability by significantly reducing the component count.The L293, L293E and L298N dual-bridge ICs (see box, ”inside the dual-bridge ICs”) significantly reduce the problems encountered in the design of stepper-motor drive circuitry. They can, for example,simplify the design and increase the efficiency of constant-current choppers. And with a single chip replacing the transistors and predriver stages, circuit performance improves. Best of all, the devices have applications in complex as well as basic driver networks.
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