MC33039D

Product Summary

The MC33039 is a high performance closed?loop speed control  adapter specifically designed for use in brushless DC motor control  systems. Implementation will allow precise speed regulation without  the need for a magnetic or optical tachometer. This device contains  three input buffers each with hysteresis for noise immunity, three  digital edge detectors, a programmable monostable, and an internal  shunt regulator. Also included is an inverter output for use in systems  that require conversion of sensor phasing. Although this device is  primarily intended for use with the MC33035 brushless motor  controller, it can be used cost effectively in many other closed?loop  speed control applications.

Parametrics

The MC33039 provides an economical method of  implementing closed?loop speed control of brushless DC  motors by eliminating the need for a magnetic or optical  tachometer. Shown in the timing diagram of Figure 1, the  three inputs (Pins 1, 2, 3) monitor the brushless motor rotor  position sensors. Each sensor signal transition is digitally  detected, ORed at the Latch Set Input, and causes CT to  discharge. A corresponding output pulse is generated at fout  (Pin 5) of a defined amplitude, and programmable width  determined by the values selected for RT and CT (Pin 6). The  average voltage of the output pulse train increases with  motor speed. When fed through a low pass filter or  integrator, a DC voltage proportional to speed is generated.  Figure 2 shows the proper connections for a typical closed

Features

? Digital Detection of Each Input Transition for Improved Low Speed  Motor Operation  ? TTL Compatible Inputs With Hysteresis  ? Operation Down to 5.5 V for Direct Powering from MC33035  Reference  ? Internal Shunt Regulator Allows Operation from a Non?Regulated  Voltage Source  ? Inverter Output for Easy Conversion between 60°/300° and  120°/240° Sensor Phasing Conventions  ? Pb?Free Packages are Available

Diagrams

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