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MA102 Datasheet(PDF) 9 Page - Monolithic Power Systems

Part No. MA102
Description  Rotary Knob Kit for the MagAlpha
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MA102 Datasheet(HTML) 9 Page - Monolithic Power Systems

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EVKT-KNOB
– ROTARY KNOB KIT FOR THE MAGALPHA
EVKT-KNOB
www.MonolithicPower.com
9
12/10/2018
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
MAGNETIC FIELD
A NdFeB cylinder magnet is mounted at the end of the aluminum shaft.
Table 6: Magnet Characteristics
Material
NdFeB (N35 or N35H)
Remanence (Br)
1.2T
Diameter
5mm
Height
2.5mm
Magnetization
Diametrical
How to Change the Mechanical Zero
Unscrew the knob with a Hex
key 1/16”. Hold the shaft with a pin inserted in the 2mm diameter hole
and rotate the knob to the desired position. When tightening the screw, ensure that the shaft is fully
inserted. Note that the zero position can also be adjusted through programming, as described in the
MagAlpha datasheet.
Figure 13: Adjusting the Magnet Angular Position
How to Change the Magnetic Field Amplitude
The performance of the MagAlpha remains the same from 75mT to 150mT and higher (the MagAlpha
has no maximum operating field). The critical region is the lower end of the specified range. Some
parameters (i.e.: noise, linearity) deteriorate gradually when the magnetic field becomes weak. The two
spacers enclosed in this evaluation kit allow the sensor (the noise level in particular) to be tested at low
magnetic fields.
Figure 14: Magnetic Field vs. Air Gap for the Supplied Magnet


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