US5781LSE Melexis Inc, US5781LSE Datasheet - Page 24

• Manufacturer Part Number: US5781LSE
• Description: IC HALL EFFECT SWITCH TSOT-23
• Manufacturer: Melexis Inc
• Type: Unipolar Switchr

Specifications of US5781LSE

• Sensing Range: 15mT Trip, 3.5mT Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 5mA
• Current - Output (max): 50mA
• Output Type: Digital, Open Drain
• Operating Temperature: -40°C ~ 150°C
• Package / Case: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: US5781LSETR

Sample Magnet A is used in the double-pole slide-by method to show the variation air gap may have in
a mechanical system. These changes in air gap may be caused by factors such as vibration, wear, etc...
Note the differences in each air gap’s slope and maximum flux density. As the air gap distance becomes
larger, a decrease in flux density slope will cause less accurate switching in a Hall Effect System.
Graph 9
Graph 6, Slide-by with Sample Magnet A Air Gap Tolerance
By zooming in on the previous graph, min. BRP and max. BOP of the Hall Effect System can be shown
in greater detail and will also reveal the differences in activation distance at each air gap. See Graph 10.
Graph 7, Slide-by with Sample Magnet A
Change in Activation Distance with Air Gap
The plotted lines in Graph 7 do not include the effects of temperature. Graph 8 shows how temperature
will change the magnet’s flux density characteristics over the selected operating temperature range (-40
to 85
the 2mm air gap is plotted.
Section 3 - Applications
-30
0
C), thus affecting the activation distance at min. B RP and max. B OP . To simplify the graph, only
-1.5
-25
-20
-1
-15
-0.5
Distance (mm)
-10
-100
-200
-300
-400
400
300
200
100
Distance (mm)
0
-5
-1000
-1200
1200
1000
-200
-400
-600
-800
0
800
600
400
200
0
0
0.5
5
10
1
Air Gap = 1.5mm
Air Gap = 2.0mm
Air Gap = 2.5mm
Air Gap = 1.5 mm
Air Gap = 2.0 mm
Air Gap = 2.5 mm
15
Always ON
Always OFF
1.5
20
25
3-32
30
0
C