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AXBM2001 Datasheet(PDF) 2 Page - Zetex Semiconductors |
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AXBM2001 Datasheet(HTML) 2 Page - Zetex Semiconductors |
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2 / 14 page  APPLICATION REQUIREMENTS Introduction A typical electronics application circuit for a 2-phase, DC brushless motor will consist of, but not be restricted to, three main building blocks. First will be the controller itself containing the functions as described in the datasheet. Attached to this will be a Hall device as a means of monitoring and controlling the commutation of the motor and finally there will be the power driver devices used to switch the two Phase windings. On top of these three building blocks will be other items such as the Speed Control stimulus circuit, e.g. a thermistor. Further functions may be required dependant upon application, perhaps as a means of ‘value adding’ to the overall final product. Some ideas of this nature will also be discussed in a later section. The first part of the Applications Note, however, discusses the various interface aspects of the external component requirements to the ZXBM200x series. To aid clarity in this first section any circuits given will show only the areas of interest to that section of discussion. This is followed by a section of practical examples that will include circuits in their entirety. The Hall Sensor Two types of Hall sensor can be used in conjunction with the ZXBM200x controllers, those having an unbuffered output stage, sometimes known as a ‘naked’ Hall, and those with a buffered output. Figures 1 and 2 show the two respective types and their connection to the ZXBM2001. The unbuffered type have a differential low level signal output with the shape of this signal being a direct representation of the magnetic field from the permanent magnet Rotor. These sensors are connected to the ZXBM using the differential inputs H+ and H- on Pins 2 and 3 respectively. See Figure 1 for connection details. R1 in Figure 1 should be chosen to suit the Hall sensor type and is provided to bias to the Hall device. AN 36 - 2 Applications Note AN36 Issue1 - JULY 2002 Figure 1 Connection of unbuffered (naked) Hall Figure 2 Connection of buffered Hall |
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