LAH-25-NP Datasheet, PDF (1/3 Pages) LEM – Current Transducer LAH 25-NP

Current Transducer LAH 25-NP
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic separation between the primary circuit and the secondary
circuit.
I_{P N} = 8-12-25 A
Electrical data
I_{P N} Primary nominal RMS current
I_{P M} Primary current, measuring range ¹⁾
R_M Measuring resistance @ ²⁾

with ±12 V
@ I_{P N} [±At DC]

@ I_{P N} [At RMS] ³⁾
with ±15 V
@ I_{P N} [±At DC]

@ I_{P N} [At RMS] ³⁾

@
I_P
<
I 4)
PN
I_{S N} Secondary nominal RMS current
K_N Conversion ratio
U_C Supply voltage (±5 %)
I_C
Current consumption
25
0 … ±55
T_A = 70 °C
R R _{M min M max}
0 284
0 182
67 398
67 263
At
At
T_A = 85 °C
R R _{M min M max}
0 280 Ω
0 178 Ω
70 394 Ω
70 259 Ω
25
mA
1-2-3 : 1000
±12 … 15
V
10 (@ ±15 V) +I_S
mA
Accuracy - Dynamic performance data
X
Accuracy ⁵⁾ @ I_{P N}, T_A = 25 °C
ε_L
Linearity error

±0.3
%
< 0.2
%
Typ Max
I_O
Offset current @ I_P = 0, T_A = 25 °C
±0.15
mA
I_{O M} Magnetic offset current @ I_P = 0,
and specified R_M, after an overload of 5 × I_{P N}
±0.20 ±0.25
mA
I_{O T} Temperature variation of I_O 0 °C … +70 °C
±0.10 ±0.60
mA
−25 °C … +85 °C
±0.10 ±0.70
mA
t_ra
Reaction time to 10 % of I_{P N}
t_r
Step response time ⁶⁾ to 90 % of I_{P N}
BW Frequency bandwidth (−1 dB)
< 200
ns
< 500
ns
DC … 200
kHz
General data
T_A Ambient operating temperature
−25 … +85
°C
T_S Ambient storage temperature
−40 … +90
°C
R_S Resistance of secondary winding @ T_A = 70 °C 72
Ω
@ T_A = 85 °C 76
Ω
m Mass
20
g
Standards
EN 50178: 1997
Notes: ¹⁾ During 10 s, with R_M ≤ 109 Ω (U_C = ±15 V)
2) _{Calculation of RM min with the maximum power of the transistors = 0.307 W}
@ 70 °C and the maximum power of the transistors = 0.302 W @ 85 °C
3) _{Sinusoidal wave 50 Hz}
4) _{The minimum measuring resistance RM may be lower}
(see “LAH technical information” leaflet)
5) _{Without IO & IO M}
6) _{With a di/dt of 100 A/µs.}
Features
●● Closed loop (compensated) multi-
range current transducer using
the Hall effect
●● Printed circuit board mounting
●● Insulating plastic case recognized
according to UL 94-V0.
Advantages
●● Excellent accuracy
●● Very good linearity
●● Low temperature drift
●● Optimized response time
●● 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.
Application domain
●● Industrial.
N° 97.34.19.000.0
24February2017/Version 9
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
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