Uni- and Bipolar Hall IC Switches for
Magnetic Field Applications
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L;
TLE 4945-2L
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
P-SSO-3-2
Type
TLE 4905 L
TLE 4935 L
TLE 4935-2 L
TLE 4945 L
TLE 4945-2L
Ordering Code
Q67006-A9120
Q67006-A9112
Q67006-A9143
Q67006-A9163
on request
Package
P-SSO-3-2
P-SSO-3-2
P-SSO-3-2
P-SSO-3-2
P-SSO-3-2
TLE 4905/35/35-2/45 L (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
1997-09-01
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Pin Configuration
(view on branded side of component)
Center of
sensitive area
2.08
±0.15
1.35
±0.15
1
2
3
V
S
GND
Q
AEP01364
Figure 1
Pin Definitions and Functions
Pin No.
1
2
3
Symbol
Function
Supply voltage
Ground
Output
V
S
GND
Q
Semiconductor Group
2
1997-09-01
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
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
Semiconductor Group
3
1997-09-01
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
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 current is reduced, 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
Switching Characteristics Unipolar Type
Semiconductor Group
4
1997-09-01
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Functional Description Bipolar Type TLE 4935/35-2/45 (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). When a reverse magnetic field is generated, the output of the IC turns
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
Switching Characteristics Bipolar Type
Semiconductor Group
5
1997-09-01
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