P-SSO-3-2
Semiconductor Group
1
1997-09-01
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
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.
Type
Ordering Code
Package
TLE 4905 L
Q67006-A9120
P-SSO-3-2
TLE 4935 L
Q67006-A9112
P-SSO-3-2
TLE 4935-2 L
Q67006-A9143
P-SSO-3-2
TLE 4945 L
Q67006-A9163
P-SSO-3-2
TLE 4945-2L
on request
P-SSO-3-2
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
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Semiconductor Group
2
1997-09-01
Pin Configuration
(view on branded side of component)
Figure 1
Pin Definitions and Functions
Pin No.
Symbol
Function
1
V
S
Supply voltage
2
GND
Ground
3
Q
Output
AEP01364
V
S
GND
Q
2
3
1
1.35
2.08
Center of
sensitive area
0.15
0.15
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Semiconductor Group
3
1997-09-01
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.
Figure 2
Block Diagram
AEB01243
Hall-
Generator
V
S
V
Ref
Output
Stage
Schmitt-
Trigger
Amplifier
Threshold
Generator
V
S
1
Q
3
2
GND
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Semiconductor Group
4
1997-09-01
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).
Figure 3
Sensor/Magnetic-Field Configuration
Figure 4
Switching Characteristics Unipolar Type
AES01231
S
N
Branded Side
+
V
S
-
V
Q
+
AED01420
Induction
Output Voltage
0
B
RP
OP
B
B
t
V
QH
V
QL
Q
V
t
TLE 4905 L; TLE 4935 L;
TLE 4935-2 L; TLE 4945 L; TLE 4945-2L
Semiconductor Group
5
1997-09-01
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).
Figure 5
Sensor/Magnetic-Field Configuration
Figure 6
Switching Characteristics Bipolar Type
AES01231
S
N
Branded Side
+
V
S
-
V
Q
+
AED01421
Induction
Output Voltage
0
B
RP
OP
B
B
t
V
QH
V
QL
Q
V
t
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