A Monolithic Pulse-Proportional Servo IC for Radio Control Applications
Joel Silverman · IEEE Transactions on Consumer Electronics · 1979
Pulse-proportional servo systems find a wide range of applications in many consumer products, such as radio controlled model airplanes and toys, as well as the remotely-controlled appliances. This wide spread acceptance of radio controlled consumer products has been possible by the advent of low cost monolithic IC's which greatly reduce the cost and complexity of such servo systems. This paper describes the design and the performance of a new pulse-proportional servo amplifier specifically designed for radio controlled consumer products. The monolithic IC is designed to control a shaft position in direct proportion to the input pulse-width. The circuit can directly drive servo motors requiring up to 350 mA of drive current. This drive capability can be boosted to in excess of 1/2 amp with the addition of two external PNP transistors.