Siemens TLE4945-2G, TLE4935G, TLE4935-2G, TLE4905G Datasheet
Uni- and Bipolar Hall IC Switches for
Magnetic Field Applications
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
Type Ordering Code Package
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
SOT-89
Bipolar IC
▼
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
▼
▼ New type
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.
Semiconductor Group 1 1998-04-29
Pin Configuration
(top view)
±0.2
1
2.25
±0.2
TLE 4905 G; TLE 4935 G
TLE 4935-2 G; TLE 4945-2 G
Center of
sensitive area
123
Figure 1
Pin Definitions and Funtions
Pin No. Symbol Function
1
V
S
2 GND Ground
3QOutput
Supply volt age
AEP02150
Semiconductor Group 2 1998-04-29
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 t he hall probe. This voltage is
amplified and switches a Schmitt-trigg er with open-collector output. A protec tion diode
against reverse power supply is integrated.
The output is protected against electrical disturbances.
Threshold
Generator
1
V
S
V
S
V
Ref
Figure 2 Block Diagram
Hall-
Generator
2
GND
Amplifier
Schmitt-
Trigger
Output
Stage
AEB01243
3
Q
Semiconductor Group 3 1998-04-29
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 fie ld is applied in the indicated directi on (figure 3) and the
B
turn-on magnetic induction
(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).
Ι
is exceeded, the output of the Hall-effect IC will conduct
OP
+
Branded Side
S
V
N
Q
Figure 3 Sensor/Magnetic-Field Configuration
B
B
OP
B
RP
0
V
Q
V
QH
+
-
V
S
Induction
t
Output Voltage
AES01231
V
QL
t
AED01420
Figure 4 Switching Characteristics Unipolar Type
Semiconductor Group 4 1998-04-29
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