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
I
PM
V
OUT
V
REF
G
N
S
R
L
C
Lmaxi
R
IM
TCR
IM
V
C
I
C
X
Primary nominal current rms
Primary current, measuring range
Output voltage (Analog) @
I
P
I
P
= 0
Reference voltage (internal reference), refout mode
Reference voltage (external reference), refin mode
Sensitivity
Number of secondary turns (± 0.1 %)
Load resistance
Maximum capacitive loading
Internal measuring resistance (± 0.5 %)
Temperature coefficient of
R
IM
Supply voltage (± 5 %)
Current consumption @
V
C
= 5 V
Typ
Accuracy @
I
PN
,
T
A
= 25°C
Accuracy with
R
IM
@
I
PN
,
T
A
= 25°C
Linearity error
25
At
1)
0 .. ± 80
At
2.5
±
(0.625
·
I
P
/I
PN
) V
2.5
2)
V
3)
2.5
V
1.9 .. 2.7
4)
V
25
mV/A
2000
≥
2
k
Ω
500
pF
50
Ω
< 50
ppm/K
5
V
5)
28 +
I
S
+ (V
OUT
/R
L
) mA
± 0.2
± 0.7
< 0.1
Maxi
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
V
OM
Magnetic offset voltage @
I
P
=
0, after an overload of 3 x
I
PN
5 x
I
PN
10 x
I
PN
TCV
REF
Temperature coefficient
V
REF
@
I
P
= 0 - 10°C .. + 85°C
- 40°C .. - 10°C
t
ra
Reaction time @ 10 % of
I
PN
t
r
Response time to 90 % of
I
PN
step
di/dt
di/dt accurately followed
BW
Frequency bandwidth (0 .. - 0.5 dB)
(- 0.5 .. 1 dB)
Notes:
1)
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.
Accuracy - Dynamic performance data
Advantages
%
%
%
ε
L
37.5
50
6)
± 0.5
± 2.0
± 2.0
50
100
< 100
< 400
> 60
DC .. 100
DC .. 200
ppm/K
ppm/K
mV
mV
mV
ppm/K
ppm/K
ns
ns
A/µs
kHz
kHz
•
•
•
•
•
•
•
Excellent accuracy
Very good linearity
Very 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.
Only in refout mode or with external REF less than 2.525 V and greater than 2.475 V. For
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
you need to buffer this output to feed it into an ADC for example
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
Application Domain
•
Industrial.
Copyright protected
Page 1/3
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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