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Current Transducer LAH 25-NP
For the electronic measurement of currents : DC, AC, pulsed ..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit).
IPN = 8-12-25 A
Electrical data
IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance @ with 12 V with 15 V @ @ @ @ @
1)
25 At 0 .. 55 At TA = 70C TA = 85C RM min RM max RM min RM max 0 0 67 67 257 155 371 236 0 0 70 70 252 150 366 231
Features
* Closed loop (compensated) multirange current transducer using the Hall effect * Printed circuit board mounting * Insulated plastic case recognized according to UL 94-V0.
IPN [ At DC ] IPN [At RMS ] 2) IPN [ At DC ] IPN [At RMS ] 2) IP < IPN 3)
ISN KN VC IC Vd Vb
Secondary nominal r.m.s. current Conversion ratio Supply voltage ( 5 %) Current consumption R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn R.m.s. rated voltage 4)
25 mA 1 - 2 - 3 : 1000 12 .. 15 V 10 (@ 15V) + IS mA 5 kV 600 V
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.
Accuracy - Dynamic performance data
X
L
Accuracy 5) @ IPN, TA = 25C Linearity Offset current @ TA = 25C Residual current @ IP = 0, after an overload of 5 x IPN Thermal drift of IO 0C .. + 70C - 25C .. + 85C Reaction time @ 10 % of IPN Response time 6) @ 90 % of IPN di/dt accurately followed Frequency bandwidth (- 1 dB)
0.3 < 0.2 Max 0.15 0.20 0.25 0.10 0.60 0.10 0.70 < 200 < 500 > 200 DC .. 200 Typ
% % mA mA mA mA ns ns A/s kHz
IO IOM IOT tr a tr di/dt f
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)
General data
TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance Mass Standards - 25 .. + 85 - 40 .. + 90 99 104 20 EN 50178 C C g
* Power supplies for welding
applications.
@ TA = 70C @ TA = 85C
7)
Notes : 1)During 10 s, with RM 109 (VC = 15 V) - 2) 50 Hz Sinusoidal 3) The measuring resistance RM min may be lower (see "LAH Technical Information" leaflet) - 4) Pollution class 2, cat. III - 5) Without IO & IOM - 6) With a di/dt of 100 A/s - 7) A list of corresponding tests is available.
010822/3
LEM Components
w w w .lem.com
Dimensions LAH 25-NP
Bottom view
(in mm. 1 mm = 0.0394 inch)
Secondary terminals
Terminal M : measure Terminal + : supply voltage + 15 V Terminal - : supply voltage - 15 V
Left view
Connection Front view
IN OUT
Number of primary turns
Primary current nominal maximum
Nominal output current
Turns ratio
Primary resistance
Primary insertion inductance
Recommended PCB c o n n e c t i o n s
IPN [ A ] 25
IP
[A]
ISN
[ mA ]
KN 1 : 1000
RP
[ m ]
LP 0.012
[ H ]
3 2 1 IN
1
55
25
0.18
OUT
456 3 2 1 IN
2
12
27
24
2 : 1000
0.81
0.054
OUT 456 3 2 1 IN
3
8
18
24
3 : 1000
1.62
0.110
OUT 456
Mechanical characteristics
* General tolerance * Fastening & connection of primary
Recommended PCB hole * Fastening & connection of secondary Recommended PCB hole 0.2 mm 6 pins 1 x 0.8 mm 1.5 mm 3 pins 0.7 x 0.6 mm 1.2 mm
Remarks
* IS is positive when IP flows from terminals 1, 2, 3 (IN) to
terminals 6, 5, 4 (OUT).
* This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...), please contact us.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.

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