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 Ω
@ ± 0.36 A max 100 190 Ω
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 mΩ
R S Secondary coil resistance @ TA = 70°C 110 Ω
L P Primary insertion inductance 496 µH
R IS Isolation resistance @ 500 V, TA = 25°C > 1500 MΩ
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
