LTSR25-NP Datasheet, PDF (1/3 Pages) LEM – Current Transducer

Current Transducer LTSR 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
16171
Electrical data
I_PN
Primary nominal current rms
I
Primary current, measuring range
PM
V_OUT Output voltage (Analog) @ I_P
I_P = 0
V_REF Reference voltage (internal reference), refout mode
Reference voltage (external reference), refin mode
G
Sensitivity
N _S Number of secondary turns (± 0.1 %)
R
Load resistance
L
C _Lmaxi Maximum capacitive loading
R
Internal measuring resistance (± 0.5 %)
IM
TCR_IM Temperature coefficient of R _IM
V
Supply voltage (± 5 %)
C
I_C
Current consumption @ V_C = 5 V
Typ
Accuracy - Dynamic performance data
25
At
0 .. ± 80 ¹⁾
At
2.5 ± (0.625·I_P/I_PN) V
2.5 ²⁾
V
2.5 ³⁾
V
1.9 .. 2.7 ⁴⁾
V
25
mV/A
2000
≥2
kΩ
500
pF
50
Ω
< 50
ppm/K
5
V
28 +I_S5)+(V_OUT/R_L) m A
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
• Access to the internal voltage
reference
• Possibility to feed the transducer
reference from external supply.
Advantages
X
Accuracy @ I , T = 25°C
PN A
ε
Accuracy with R _IM @ I_PN , T_A = 25°C
Linearity error
L
TCV_OUT Temperature coefficient of V_OUT / V_REF @ I_P = 0
- 40°C .. + 85°C
TCG Temperature coefficient of G
- 40°C .. + 85°C
± 0.2
± 0.7
< 0.1
Maxi
37.5
50 ⁶⁾
%
%
%
ppm/K
ppm/K
• Excellent accuracy
• Very good linearity
• Very low temperature drift
• Optimized response time
• Wide frequency bandwidth
• No insertion losses
• High immunity to external
V
Magnetic offset voltage @ I =
OM
P
0,after an overload of 3 x I_PN ± 0.5
5 x I_PN ± 2.0
10 x I_PN ± 2.0
TCV_REF Temperature coefficient V_REF @ I_P = 0 - 10°C .. + 85°C 50
- 40°C .. - 10°C 100
mV
mV
mV
ppm/K
ppm/K
t_ra
t
r
di/dt
Reaction time @ 10 % of I_PN
Response time to 90 % of I step
PN
di/dt accurately followed
< 100
< 400
> 60
ns
ns
A /µ s
BW Frequency bandwidth (0 .. - 0.5 dB)
DC .. 100
kHz
(- 0.5 .. 1 dB)
DC .. 200
kHz
Notes:
1) _{Only in refout mode or with external REF less than 2.525 V and greater than 2.475 V. For}
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.
external REF out of these limits see leaflet. ²⁾ V_OUT is linked to V_REF, by conception the
difference between these two nodes for I_P = 0 is maximum ± 25 mV, 2.475 < V_OUT <
2.525 V. ³⁾ In Refout mode at T_A = 25°C, 2.475 V< V_REF < 2.525 V. The minimal impedance
loading the ref pin should be > 220 kΩ. Internal impedance = 600 Ω. For most applications
Application Domain
• Industrial.
you need to buffer this output to feed it into an ADC for example
Copyright protected
4) _{To overdrive the REF (1.9 V .. 2.7 V) maxi ± 1 mA is needed}
5)
I
S
=
I_P/N
S
6) _{Only due to TCR IM.}
070307/9
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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