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MC33039DG Arkusz danych(PDF) 3 Page - ON Semiconductor |
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MC33039DG Arkusz danych(HTML) 3 Page - ON Semiconductor |
3 / 8 page MC33039, NCV33039 http://onsemi.com 3 Figure 1. Typical Three Phase, Six Step Motor Application fout Output Latch ISetI Input φA Output φC 120 ° Sensor Electrical Phasing Input φB RT/CT φC 60 ° Sensor Electrical Phasing Input φB φA φA Vout (AVG) Constant Motor Speed Increasing Motor Speed Vth ≈ 0.67 VCC 240 60 120 300 720 600 0 Rotor Electrical Position (Degrees) 180 360 480 OPERATING DESCRIPTION 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, OR ied at the Latch iSeti 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 loop application using the MC33035 brushless motor controller. Constant speed operation down to 100 RPM is possible with economical three phase four pole motors. The φA inverter output (Pin 4) is used in systems where the controller and motor sensor phasing conventions are not compatible. A method of converting from either convention to the other is shown in Figure 3. For a more detailed explanation of this subject, refer to the text above Figure 39 on the MC33035 data sheet. The output pulse amplitude VOH is constant with temperature and controlled by the supply voltage on VCC (Pin 8). Operation down to 5.5 V is guaranteed over temperature. For systems without a regulated power supply, an internal 8.25 V shunt regulator is provided. |
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