Current Transducer CAS series
Ref: CAS 6-NP, CAS 15-NP, CAS 25-NP, CAS 50-NP
I
PN
= 6, 15, 25, 50 A
For the electronic measurement of current: DC, AC, pulsed..., with galvanic isolation
between the primary and the secondary circuit.
Features
● Closed loop (compensated) multi-range
current transducer
● Voltage output
● Single supply
● Isolated plastic case material recognized
according to UL 94-V0
● Compact design for PCB mounting.
Applications
● AC variable speed and servo motor drives
● Static converters for DC motor drives
● Battery supplied applications
● Uninterruptible Power Supplies (UPS)
● Switched Mode Power Supplies (SMPS)
● Power supplies for welding applications.
Advantages
● Very low temperature coefficient of offset
● Very good dv/dt immunity
● LTS compatible footprint
● Reduced height.
Standards
● EN 50178
● UL 508
● IEC 61010-1 (safety).
Application Domain
● Industrial.
Page 1/16
8March2012/version 7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
CAS series
Absolute maximum ratings
Parameter
Supply voltage
Primary conductor temperature
Maximum primary current
ESD rating, Human Body Model (HBM)
I
P max
Symbol
V
C
Unit
V
°C
A
kV
Value
7
110
20 x
I
PN
4
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may
degrade reliability.
Isolation characteristics
Parameter
RMS voltage for AC isolation test 50/60Hz/1 min
Impulse withstand voltage 1.2/50 µs
Partial discharge extinction voltage @ 10 pC (rms)
Clearance distance (pri. - sec.)
Creepage distance (pri. - sec.)
Creepage distance (pri. .- sec.)
Case material
Comparative tracking index
Application example
Symbol
V
d
V
w
Unit
kV
kV
V
mm
mm
mm
-
V
-
Value
4.2
7.6
1000
7.7
7.7
6.3
V0 according
to UL 94
600
Comment
V
e
dCI
dCp
-
-
CTI
-
Shortest distance through
air
Shortest path along device
body
When mounted on PCB
with recommended layout
Reinforced isolation, non
300 V CAT III
uniform field according to
PD2
EN 50178, EN 61010
Simple isolation, non
600 V CAT III
uniform field according to
PD2
EN 50178, EN 61010
600
For use in a pollution
degree 2 environment
Application example
According to UL 508:
primary potential involved in Volts RMS AC or DC
-
-
-
V
Environmental and mechanical characteristics
Parameter
Ambient operating temperature
Ambient storage temperature
Mass
Standards
Symbol
T
A
T
S
m
Unit
°C
°C
g
Min
-40
-55
9
Typ
Max
85
105
Comment
EN 50178, IEC 60950-1, IEC 61010-1, IEC 61326-1, UL 508
Page 2/16
8March2012/version 7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
CAS series
Electrical data CAS 6-NP
At
T
A
= 25°C,
V
C
= + 5 V,
N
P
= 1 turn,
R
L
= 10 k
Ω
, unless otherwise noted.
Parameter
Primary nominal current rms
Primary current, measuring range
Number of primary turns
Supply voltage
Current consumption
Output voltage
Output voltage @
I
P
= 0 A
Electrical offset voltage
Electrical offset current
referred to primary
Temperature coefficient of
V
OUT
@
I
P
= 0 A
Theoretical sensitivity
Sensitivity error
Temperature coefficient of
G
Linearity error
Magnetic offset current (10 x
I
PN
)
referred to primary
Output current noise (spectral
density) rms 100 .. 100 kHz
referred to primary
Peak-peak output ripple at
oscillator frequency
f
= 450 kHz (typ.)
Reaction time @ 10 % of
I
PN
Response time @ 90 % of
I
PN
Frequency bandwidth (± 1 dB)
Frequency bandwidth (± 3 dB)
Overall accuracy
Overall accuracy @
T
A
= 85°C
Accuracy
Accuracy @
T
A
= 85°C
Symbol
I
PN
I
PM
N
P
V
C
I
C
V
OUT
V
OUT
V
OE
I
OE
TCV
OUT
Gth
Unit
A
A
-
V
mA
V
V
mV
-10.4
0.375
2.5
10.4
100% tested
V
OUT
- 2.5 V
100% tested
ppm/K of 2.5 V
- 40°C .. 85°C
625 mV/
I
PN
0.7
±40
-0.1
-0.1
36
0.1
0.1
R
L
= 1 k
Ω
100% tested
- 40°C .. 85°C
4.75
15 +
-20
1,2,3
5
I
P
(mA)
N
S
5.25
20 +
I
P
(mA)
N
S
N
S
= 1731 turns
Min
Typ
6
20
Max
Comment
4.625
A
ppm/K
mV/A
%
ppm/K
% of
I
PN
A
-0.1
±10
104.2
-0.7
0.1
±80
ε
G
TCG
ε
L
I
OM
i
no
-
t
ra
t
r
BW
BW
X
G
X
G
X
X
µA/Hz
½
mV
µs
µs
kHz
kHz
% of
I
PN
% of
I
PN
% of
I
PN
% of
I
PN
200
300
40
160
0.3
0.3
R
L
= 1 k
Ω
R
L
= 1 k
Ω
di/dt = 18 A/µs
R
L
= 1 k
Ω
di/dt = 18 A/µs
R
L
= 1 k
Ω
R
L
= 1 k
Ω
2.5
4.6
0.8
3.0
Page 3/16
8March2012/version 7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
CAS series
Electrical data CAS 15-NP
At
T
A
= 25°C,
V
C
= + 5 V,
N
P
= 1 turn,
R
L
= 10 k
Ω
, unless otherwise noted.
Parameter
Primary nominal current rms
Primary current, measuring range
Number of primary turns
Supply voltage
Current consumption
Output voltage
Output voltage @
I
P
= 0 A
Electrical offset voltage
Electrical offset current
referred to primary
Temperature coefficient of
V
OUT
@
I
P
= 0 A
Theoretical sensitivity
Sensitivity error
Temperature coefficient of
G
Linearity error
Magnetic offset current (10 x
I
PN
)
referred to primary
Output current noise (spectral
density) rms 100 Hz .. 100 kHz
referred to primary
Peak-peak output ripple at
oscillator frequency
f
= 450 kHz (typ.)
Reaction time @ 10 % of
I
PN
Response time @ 90 % of
I
PN
Frequency bandwidth (± 1 dB)
Frequency bandwidth (± 3 dB)
Overall accuracy
Overall accuracy @
T
A
= 85°C
Accuracy
Accuracy @
T
A
= 85°C
Symbol
I
PN
I
PM
N
P
V
C
I
C
V
OUT
V
OUT
V
OE
I
OE
TCV
OUT
Gth
Unit
A
A
-
V
mA
V
V
mV
-7.1
0.375
2.5
7.1
100% tested
V
OUT
- 2.5 V
100% tested
ppm/K of 2.5 V
- 40°C .. 85°C
625 mV/
I
PN
0.7
±40
-0.1
-0.1
90
0.1
0.1
R
L
= 1 k
Ω
100% tested
- 40°C .. 85°C
4.75
15 +
-51
1,2,3
5
5.25
N
S
= 1731 turns
Min
Typ
15
51
Max
Comment
I
P
(mA)
I
(mA)
20 +
P
N
S
N
S
4.625
A
ppm/K
mV/A
%
ppm/K
% of
I
PN
A
-0.17
±7.5
41.67
-0.7
0.17
±70
ε
G
TCG
ε
L
I
OM
i
no
-
t
ra
t
r
BW
BW
X
G
X
G
X
X
µA/Hz
½
mV
µs
µs
kHz
kHz
% of
I
PN
% of
I
PN
% of
I
PN
% of
I
PN
200
300
15
60
0.3
0.3
R
L
= 1 k
Ω
R
L
= 1 k
Ω
di/dt = 44 A/µs
R
L
= 1 k
Ω
di/dt = 44 A/µs
R
L
= 1 k
Ω
R
L
= 1 k
Ω
1.9
3.9
0.8
2.7
Page 4/16
8March2012/version 7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
CAS series
Electrical data CAS 25-NP
At
T
A
= 25°C,
V
C
= + 5 V,
N
P
= 1 turn,
R
L
= 10 k
Ω
, unless otherwise noted.
Parameter
Primary nominal current rms
Primary current, measuring range
Number of primary turns
Supply voltage
Current consumption
Output voltage
Output voltage @
I
P
= 0 A
Electrical offset voltage
Electrical offset current
referred to primary
Temperature coefficient of
V
OUT
@
I
P
= 0 A
Theoretical sensitivity
Sensitivity error
Temperature coefficient of
G
Linearity error
Magnetic offset current (10 x
I
PN
)
referred to primary
Output current noise (spectral
density) rms 100 Hz .. 100 kHz
referred to primary
Peak-peak output ripple at
oscillator frequency
f
= 450 kHz (typ.)
Reaction time @ 10 % of
I
PN
Response time @ 90 % of
I
PN
Frequency bandwidth (± 1 dB)
Frequency bandwidth (± 3 dB)
Overall accuracy
Overall accuracy @
T
A
= 85°C
Accuracy
Accuracy @
T
A
= 85°C
Symbol
I
PN
I
PM
N
P
V
C
I
C
V
OUT
V
OUT
V
OE
I
OE
TCV
OUT
Gth
Unit
A
A
-
V
mA
V
V
mV
-6.25
0.375
2.5
6.25
100% tested
V
OUT
- 2.5 V
100% tested
ppm/K of 2.5 V
- 40°C .. 85°C
625 mV/
I
PN
0.7
±40
-0.1
-0.1
150
0.1
0.1
R
L
= 1 k
Ω
100% tested
- 40°C .. 85°C
4.75
15 +
-85
1,2,3
5
5.25
N
S
= 1731 turns
Min
Typ
25
85
Max
Comment
I
P
(mA)
I
P
(mA)
20 +
N
S
N
S
4.625
A
ppm/K
mV/A
%
ppm/K
% of
I
PN
A
-0.25
±6.5
25
-0.7
0.25
±60
ε
G
TCG
ε
L
I
OM
i
no
-
t
ra
t
r
BW
BW
X
G
X
G
X
X
µA/Hz
½
mV
µs
µs
kHz
kHz
% of
I
PN
% of
I
PN
% of
I
PN
% of
I
PN
200
300
10
40
0.3
0.3
R
L
= 1 k
Ω
R
L
= 1 k
Ω
di/dt = 68 A/µs
R
L
= 1 k
Ω
di/dt = 68 A/µs
R
L
= 1 k
Ω
R
L
= 1 k
Ω
1.8
3.5
0.8
2.5
Page 5/16
8March2012/version 7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
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