tle4905g(1).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
TLE 4905 G
TLE 4935 G
TLE 4935-2 G
TLE 4945-2 G
Marking
05
35
35 2
45 2
Ordering Code
Q62705-K402
Q62705-K404
Q62705-K405
Q62705-K403
Package
SOT-89
SOT-89
SOT-89
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
2000-07-01
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
Pin Configuration
(top view)
2.25
±0.2
Center of
sensitive area
1
±0.2
1
2
3
AEP02150
Figure 1
Pin Definitions and Funtions
Pin No.
1
2
3
Symbol
Function
Supply voltage
Ground
Output
V
S
GND
Q
Data Sheet
2
2000-07-01
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
Hall-
Generator
3
Q
V
S
V
Ref
Amplifier
Schmitt-
Trigger
Output
Stage
AEB01243
2
GND
Figure 2
Block Diagram
Data Sheet
3
2000-07-01
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
Ι
S
N
V
Q
+
V
S
-
AES01231
Figure 3
Sensor/Magnetic-Field Configuration
B
B
OP
B
RP
0
Induction
t
V
Q
V
QH
Output Voltage
V
QL
t
AED01420
Figure 4
Data Sheet
Switching Characteristics Unipolar Type
4
2000-07-01
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
Ι
S
N
V
Q
+
V
S
-
AES01231
Figure 5
Sensor/Magnetic-Field Configuration
B
B
OP
0
t
B
RP
Induction
V
Q
V
QH
Output Voltage
V
QL
t
AED01421
Figure 6
Data Sheet
Switching Characteristics Bipolar Type
5
2000-07-01

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