Design example of switch using Hall Effect IC

Example: Shown below are several design examples of proximity switch that uses EW-450.
In these designs, the following assumption is applied: Bop = 20 mT (Ta=25°C)

 

Ferrite magnet: Br = 280 (mT), φ= 5 mm, L = 3 mm

                                                                          【Distance vs. magnetic flux density】

                          

                                                                        【Gap vs. magnetic flux density】

                          

 

SmCo magnet: Br = 800 (mT), φ = 5 mm, L = 3 mm

                                                                          【Distance vs. magnetic flux density】

                          

                                                                         【Gap vs. magnetic flux density】

                          

                                                                         【Distance vs. magnetic flux density】

                          

*In an actual design, please take into account the temperature characteristics of the Hall IC and magnet in use.

 

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