Motor controller uses micro power

Posted on Oct 17, 2012

The circuit in Figure 1 implements a low-cost, micropower, latching motor controller that uses current sensing rather than switches to stop the motor. The design is optimized for a supply voltage of 3 to 9V, making it well-suited to battery-powered applications. To understand how the circuit works, assume that cross-coupled flip-flops IC1A and IC1B are both in a reset state, such that the D input of each one is high. Because both Q outputs are low, the H-bridge transistors, Q1 to Q4, are all off, and the motor is idle.

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