Current Transducer LA 25-NP/SP14
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).
Electrical data
IPN Primary nominal r.m.s. current 0.25 A
IPPrimary current, measuring range 0 .. ± 0.36 A
R M Measuring resistance RM min RM max
with ± 15 V @ ± 0.25 A max 100 320
@ ± 0.36 A max 100 190
ISN Secondary nominal r.m.s. current 25 mA
K N Conversion ratio 100 : 1000
VCSupply voltage (± 5 %) ± 15 V
ICCurrent consumption 10 + ISmA
VdR.m.s. voltage for AC isolation test, 50 Hz, 1 mn 2.5 kV
VbR.m.s. rated voltage 1),safe separation 600 V
basic isolation 1700 V
Accuracy - Dynamic performance data
XTypical accuracy @ IPN , TA = 25°C ± 0.5 %
εLLinearity < 0.2 %
Typ Max
IOOffset current 2) @ IP = 0, TA = 25°C ± 0.05 ± 0.15 mA
IOM Residual current 3) @ IP = 0, after an overload of 3 x IPN ± 0.05 ± 0.15 mA
IOT Thermal drift of IO- 10°C .. + 70°C ± 0.10 ± 0.35 mA
trResponse time 4) @ 90 % of IP max < 1 µs
fFrequency bandwidth (- 1 dB) DC .. 150 kHz
General data
TAAmbient operating temperature - 10 .. + 70 °C
TSAmbient storage temperature - 25 .. + 85 °C
R P Primary coil resistance @ TA = 25°C < 745 m
R S Secondary coil resistance @ TA = 70°C 110
L P Primary insertion inductance 496 µH
R IS Isolation resistance @ 500 V, TA = 25°C > 1500 M
mMass 22 g
Standards 5) EN 50178
Notes : 1) Pollution class 2
2) Measurement carried out after 15 mn functionning
3) The result of the coercive field of the magnetic circuit
4) With a di/dt of 100 A/µs
5) A list of corresponding tests is available
Features
Closed loop (compensated) multi-
turns current transducer using the
Hall effect
Insulated plastic case recognized
according to UL 94-V0.
Special features
IPN =0.25 A
IP=0 .. ± 0.36 A
K N =100 : 1000
TA=- 10°C .. + 70°C.
Advantages
Excellent accuracy
Very good linearity
Low temperature drift
Optimized response time
Wide frequency bandwidth
No insertion losses
High immunity to external
interference
Current overload capability.
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.
IPN =0.25 A
990126/2
LEM Components www.lem.com
Dimensions LA 25-NP/SP14 (in mm. 1 mm = 0.0394 inch)
Secondary terminals
Terminal +:supply voltage +15 V
Terminal M:measure
Terminal -:supply voltage -15 V
Connection
Remark
IS is positive when IP flows from terminal + to terminal -.
Mechanical characteristics
General tolerance ± 0.2 mm
Fastening & connection of primary 2 pins
0.635 x 0.635 mm
Fastening & connection of secondary 3 pins 1 mm
Recommended PCB hole 1.2 mm
Right viewBottom view Top view
Back view
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
swiss
made
Standard 00 Year Week
or N° SP..
in
out