Magnetic Field Sensors
Current Sensor KMC 05
Function principle
Magnetoresistive materials can change their resistivity in an external magnetic field. The
variation of the resistivity is determined by the rotation of magnetisation with respect to the
direction of the current flow. Permalloy
(Ni
81
Fe
19
)
is commercially used as
magnetoresistive material. The relative change of resistivity is 2-3 % for this material. The
high sensitive and small size sensor consists of a silicon chip coated with thin film
permalloy stripes. These stripes form a Wheatstone bridge, whose output voltage
depends on the magnetic field.
Characteristic
The sensor chip measures the magnetic field generated by an internal current-carrying
conductor. The current sensor has an integrated permanent magnet. No external auxiliary
field H
x
is required. A direct or alternating current I
M
up to 5 A can be detected.
Package: mod. SM-8
Sensors in thin film technology
HL-Planartechnik GmbH
Hauert 13, D - 44 227 Dortmund, Tel.: +49 (0) 231/97400, Fax.: +49 (0) 231/974020
Internet:
http://www.hlplanar.com
E-Mail: service@hlplanar.de
Magnetic Field Sensors
Current Sensor KMC 05
Technical data
Absolute maximum ratings
Parameter
Supply voltage
Measurable current
Operating temperature range
Storage temperature range
Symbol
V
B
I
M
T
amb
T
stg
Unit
V
A
°C
°C
Value
12
5
-40 ... +125
-65 ... +150
Test conditions for Input-Output
Insulation:
200V DC for 50ms between pin 3
and pin 2
Electrical characteristics ( T
amb
= 25°C )
Parameter
Bridge resistance
Offset voltage
Open circuit sensitivity
Resitance of the conductor
Operating frequency
Temperature coefficient of
open circuit sensitivity
Input-Output Insulation
Symbol
R
B
V
OFF
/V
B
S
R
f
max
T
C
I
I-O
Unit
kOhm
mV/V
(mV/V)/A
mOhm
kHz
%/K
nA
Min.
1.4
-
-
-
-
-
-
Typ.
1.7
-
0.7
0.7
-
-
-
Max.
2.2
±
2
-
-
100
-0.3
100
KMC 05 output voltage V
o
versus current I
M
for an
auxiliary field H
x
created by
an internal magnet
Sensors in thin film technology
HL-Planartechnik GmbH
Hauert 13, D - 44 227 Dortmund, Tel.: +49 (0) 231/97400, Fax.: +49 (0) 231/974020
Internet:
http://www.hlplanar.com
E-Mail: service@hlplanar.de
7.12.01
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