SWITCHING_MODE_CONTROLLER

Published:2009/7/6 23:49:00 Author:May | From:SeekIC

Developed for driving 0.0l-hp motor M at variable speeds with minimum battery drain. Circuit uses pulses with low duty cycle to set up continuous current in motor approximating almost 200 mA when average battery drain is 100 mA for output volt-age of 3.5 V. Voltage comparator A, serves as oscillator and as duty-cycle element of controller. C1 and R1 provide positive feedback giving oscillation at about 20 kHz, with duty-cycle range of 10% to 70% controlled by feedback loop Q1-R1-C3-R3. D2 is used in place of costly large capacitor for filtering.-J. C. Sinnett, Switching-Mode Controller Boosts DC Motor Efficiency, Electronics, May 25, 1978, p 132.



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