UC3633

UC1633 UC2633 UC3633 Phase Locked Frequency Controller FEATURES Precision Phase Locked Frequency Control System DESCRIPTION The UC1633 family of integrated circuits was designed for use in phase locked frequency control loops. While optimized for precision speed control of DC motors, these devices are universal enough for most apCrystal Oscillator plications that require phase locked control. A precise reference freProgrammable Reference Frequency quency can be generated using the device’s high frequency oscillator Dividers and programmable frequency dividers. The oscillator operates using a Phase Detector with Absolute Frequency broad range of crystals, or, can function as a buffer stage to an external frequency source. Steering Digital Lock Indicator Double Edge Option on the Frequency Feedback Sensing Amplifier Two High Current Op-Amps 5V Reference Output The phase detector on these integrated circuits compares the reference frequency with a frequency/phase feedback signal. In the case of a motor, feedback is obtained at a hall output of other speed detection device. This signal is buffered by a sense ampilfier that squares up the signal as it goes into the digital phase detector. The phase detector responds proportionally to the phase error between the reference and the sense amplifier output. This phase detector includes absolute frequency steering to provide maximum drive signals when any frequency error exists. This feature allows optimum start-up an...