Current Transducer LTS 25-NP
For the electronic measurement of currents : DC, AC, pulsed, mixed,
with a galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
I
PN
= 25 At
16054
Electrical data
I
PN
I
PM
V
OUT
G
N
S
R
L
R
IM
TCR
IM
V
C
I
C
Primary nominal current rms
Primary current, measuring range
Output voltage (Analog) @
I
P
I
P
= 0
Sensitivity
Number of secondary turns (± 0.1 %)
Load resistance
Internal measuring resistance (± 0.5 %)
Temperature coefficient of
R
IM
Supply voltage (± 5 %)
Current consumption @
V
C
= 5 V
25
At
0 .. ± 80
At
2.5
±
(0.625
·
I
P
/I
PN
) V
2.5
1)
V
25
mV/A
2000
≥
2
k
Ω
50
Ω
< 50
ppm/K
5
V
2)
28 +
I
S
+(V /R
L
)mA
OUT
Features
•
Closed loop (compensated) multi-
•
•
•
•
•
range current transducer using the
Hall effect
Unipolar voltage supply
Isolated plastic case recognized
according to UL 94-V0
Compact design for PCB mounting
Incorporated measuring resistance
Extended measuring range.
Typ
Accuracy - Dynamic performance data
X
Accuracy @
I
PN
,
T
A
= 25°C
Accuracy with
R
IM
@
I
PN
,
T
A
= 25°C
Linearity error
± 0.2
± 0.7
< 0.1
%
%
%
Maxi
100 ppm/K
150 ppm/K
50
3)
ppm/K
± 0.5
± 2.0
± 2.0
mV
mV
mV
ns
ns
A/µs
kHz
kHz
Advantages
•
•
•
•
•
•
•
Excellent accuracy
Very good linearity
Very low temperature drift
Optimized response time
Wide frequency bandwidth
No insertion losses
High immunity to external
interference
•
Current overload capability.
ε
L
TCV
OUT
TCG
V
OM
Typ
Temperature coefficient of
V
OUT
@
I
P
= 0 - 10°C .. + 8 5°C 50
- 40°C .. - 10°C
Temperature coefficient of
G
- 40°C .. + 85°C
Magnetic offset voltage @
I
P
= 0,
after an overload of 3 x
I
PN
5 x
I
PN
10 x
I
PN
Reaction time @ 10 % of
I
PN
Response time to 90 % of
I
PN
step
di/dt accurately followed
Frequency bandwidth (0 .. - 0.5 dB)
(- 0.5 .. 1 dB)
Applications
•
AC variable speed drives 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.
t
ra
t
r
di/dt
BW
< 100
< 400
> 60
DC .. 100
DC .. 200
General data
T
A
T
S
m
Ambient operating temperature
Ambient storage temperature
Insulating material group
Mass
Standards
4)
1)
2)
3)
4)
- 40 .. + 85
°C
- 40 .. + 100
°C
III a
10
g
EN 50178: 1997
IEC 60950-1: 2001
Application domain
•
Industrial.
Copyright protected.
Notes:
Absolute value @
T
A
= 25°C, 2.475 <
V
OUT
< 2.525
I
S
=
I
P
/N
S
Only due to
TCR
IM
Specification according to IEC 61000-4-3 are not guaranteed between
180 and 220 MHz.
Page 1/3
070129/19
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
Current Transducer LTS 25-NP
Isolation characteristics
V
d
V
W
V
e
dCp
dCl
CTI
Rms voltage for AC isolation test, 50 Hz, 1 min
Impulse withstand voltage 1.2/50 µs
Rms voltage for partial discharge extinction @ 10pC
Creepage distance
Clearance distance
6)
Comparative Tracking Index (Group III a)
5)
3
>8
Mini
> 1.5
Mini
15.5
6.35
175
kV
kV
kV
mm
mm
Application examples
According to EN 50178 and IEC 61010-1 standards
and following conditions :
•
Over voltage category OV 3
•
Pollution degree PD2
•
Non-uniform field
EN 50178
dCp, dCI,
V
W
Single isolation
Reinforced isolation
Notes:
5)
6)
IEC 61010-1
Nominal voltage
600 V
300 V
Rated isolation voltage
600 V
300 V
On housing
On PCB with soldering pattern UTEC93-703.
Safety
This transducer must be used in electric/electronic equipment with respect to
applicable standards and safety requirements in accordance with the manufacturer's
operating instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous
voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a built-in device, whose conducting parts must be inaccessible
after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
Page 2/3
070129/19
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
Dimensions LTS 25-NP
(in mm. 1 mm = 0.0394 inch)
Bottom view
Operation principle
Front view
Back view
Number
of primary
turns
Primary nominal
current rms
I
PN
[ A ]
± 25
Nominal
output voltage
V
OUT
[ V ]
2.5 ± 0.625
Primary
resistance
R
P
[ mΩ ]
0.18
Right view
Primary
insertion inductance
L
P
[ µH ]
6
0.013
IN
1
6
1
6
1
2
5
2
5
2
3
4
3
4
3
OUT
Recommended
connections
5
4
OUT
1
2
± 12
2.5 ± 0.600
0.81
0.05
IN
OUT
3
±8
2.5 ± 0.600
1.62
0.12
IN
Mechanical characteristics
•
General tolerance
•
Fastening & connection of primary
Recommended PCB hole
•
Fastening & connection of secondary
Recommended PCB hole
•
Additional primary through-hole
± 0.2 mm
6 pins 0.8 x 0.8 mm
1.3 mm
3 pins 0.5 x 0.35 mm
0.8 mm
∅
3.2 mm
Output Voltage - Primary Current
V
OUT
[ V ]
5
4.5
3.125
2.5
1.875
0.5
Remarks
•
V
OUT
is positive when
I
P
flows from terminals 1, 2, 3 to
terminals 6, 5, 4.
•
Temperature of the primary jumper should not exceed 100°C.
-
I
Pmaxi
-
I
PN
0
I
PN
I
Pmaxi
I
P
[ At ]
Page 3/3
070129/19
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
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