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U-102 UC1637/2637/3637 Switched Mode Controller for DC Motor Drive

The UC1637 switched-mode controller for DC motors is one of several integrated circuits offered by Unitrode for motor controls. This application note presents the general principles of its operation and the circuit details that optimize its use. It includes a design that will involves not only the UC1637, but also a power H-bridge using MOSFET transistors, and a modern DC motor tachometer. Using the tachometer output and UC1637's error amplifier, we will close the velocity control loop after a brief analysis of the factors that affect the feedback loop stability.

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