tle4935.pdf

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Uni- and Bipolar Hall IC Switches for
Magnetic Field Applications
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
Bipolar IC
Features
• Temperature compensated magnetic performance
• Digital output signal
• For unipolar and alternating magnetic fields
• Large temperature range
• Protection against reversed polarity
• Output protection against electrical disturbances
SOT-89
Type
Ordering Code
Package
TLE 4905 G
Q62705-K402
SOT-89
TLE 4935 G
Q62705-K404
SOT-89
TLE 4935-2 G
Q62705-K405
SOT-89
TLE 4945-2 G
Q62705-K403
SOT-89
TLE 4905/35/35-2/45-2 (Unipolar/Bipolar Magnetic Field Switches) have been designed
specifically for automotive and industrial applications. Reverse polarity protection is
included on-chip as is output protection against negative voltage transients.
Typical applications are position/proximity indicators, brushless DC motor commutation,
rotational indexing etc.
Data Sheet
1
1999-04-01
199644165.017.png 199644165.018.png 199644165.019.png 199644165.020.png
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
Pin Configuration
(top view)
Center of
2.25 ±0.2
sensitive area
1
2
3
AEP02150
Figure 1
Pin Definitions and Funtions
Pin No.
Symbol
Function
1
V S
Supply voltage
2
GND
Ground
3
Q
Output
Data Sheet
2
1999-04-01
199644165.001.png 199644165.002.png 199644165.003.png 199644165.004.png 199644165.005.png 199644165.006.png 199644165.007.png 199644165.008.png 199644165.009.png 199644165.010.png
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
Circuit Description
The circuit includes Hall generator, amplifier and Schmitt-Trigger on one chip. The
internal reference provides the supply voltage for the components. A magnetic field
perpendicular to the chip surface induces a voltage at the hall probe. This voltage is
amplified and switches a Schmitt-trigger with open-collector output. A protection diode
against reverse power supply is integrated.
The output is protected against electrical disturbances.
Threshold
Generator
V S
1
3
Q
Hall-
Generator
V S
V Ref
Amplifier
Schmitt-
Trigger
2
GND
Output
Stage
AEB01243
Figure 2 Block Diagram
Data Sheet
3
1999-04-01
199644165.011.png 199644165.012.png 199644165.013.png
 
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
Functional Description Unipolar Type TLE 4905 (Figure 3 and 4)
When a positive magnetic field is applied in the indicated direction ( Figure 3 ) and the
turn-on magnetic induction B OP is exceeded, the output of the Hall-effect IC will conduct
(Operate Point). When the magnetic field is reduced to a value smaller than the release
point, the output of the IC turns off (Release Point; Figure 4 ).
+
Branded Side
I
S
N
V Q
+
V S
-
AES01231
Figure 3 Sensor/Magnetic-Field Configuration
B
B
OP
B RP
Induction
0
t
V
V QH
Output Voltage
V QL
t
AED01420
Figure 4 Switching Characteristics Unipolar Type
Data Sheet
4
1999-04-01
199644165.014.png 199644165.015.png
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
Functional Description Bipolar Type TLE 4935/35-2/45-2 (Figure 5 and 6)
When a positive magnetic field is applied in the indicated direction ( Figure 5 ) and the
turn-on magnetic induction B OP is exceeded, the output of the Hall-effect IC will conduct
(Operate Point). The output state does not change unless a reverse magnetic field
exceeding the turn-off magnetic induction | B RP | is exceeded. In this case the output will
turn off (Release Point; Figure 6 ).
+
Branded Side
I
S
N
V Q
+
V S
-
AES01231
Figure 5 Sensor/Magnetic-Field Configuration
B
B
0
t
Induction
B RP
V
V QH
Output Voltage
V QL
t
AED01421
Figure 6 Switching Characteristics Bipolar Type
Data Sheet
5
1999-04-01
OP
199644165.016.png

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