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110214/13 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice www.lem.com
Current Transducer LTSR 15-NP
For the electronic measurement of currents: DC, AC, pulsed, mixed,
with galvanic isolation between the primary circuit (high power) and
the secondary circuit (electronic circuit).
Electrical data
IPN Primary nominal current rms 15 At
IPM Primary current, measuring range 0 .. ± 48 1) At
ÎP Overload capability 250 At
VOUT Output voltage (Analog) @ IP 2.5 ± (0.625·IP/IPN) V
IP = 0 2.5 2) V
VREF Reference voltage (internal reference), RefOUT mode 2.5 3) V
Reference voltage (external reference), RefIN mode 1.9 .. 2.7 4) V
G Sensitivity 41.6 mV/A
N S Number of secondary turns (± 0.1 %) 2000
R L Load resistance ≥ 2 kW
C L max Maximum capacitive loading 500 pF
R IM Internal measuring resistance (± 0.5 %) 83.33 W
TCR IM Temperature coefcient of R IM < 50 ppm/K
VC Supply voltage (± 5 %) 5 V
IC Current consumption @ VC = 5 V Typ 28+IS
5)+(VOUTR/L) mA
Accuracy - Dynamic performance data
X Accuracy @ IPN , TA = 25°C ± 0.2 %
Accuracy with R IM @ IPN , TA = 25°C ± 0.7 %
eL Linearity error < 0.1 %
Max
TCVOUT Temperature coefcient of VOUT /VREF @ IP = 0
- 40°C .. + 85°C 64 ppm/K
TCG Temperature coefcient of G - 40°C .. + 85°C 50 6) ppm/K
VOM Magnetic offset voltage @ IP = 0,
after an overload of 3 x IPN ± 0.5 mV
5 x IPN ± 2.0 mV
10 x IPN ± 2.0 mV
TCVREF Temperature coefcient of internal VREF
@ IP = 0 - 10°C .. + 85°C 50 ppm/K
- 40°C .. - 10°C 100 ppm/K
tra Reaction time @ 10 % of IPN < 100 ns
tr Response time to 90 % of IPN step < 400 ns
di/dt di/dt accurately followed > 35 A/µs
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 external REF out of these limits see leaet. 2) VOUT is linked to VREF, by
conception the difference between these two nodes for IP = 0 is maximum ± 25 mV,
2.475 V < VOUT < 2.525 V. 3) In RefOUT mode at TA = 25°C, 2.475 V< VREF
< 2.525 V. The minimal impedance loading the ref pin should be > 220 kW. Internal
impedance = 600 W. 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) max ± 1 mA is
needed. 5) IS = IP/NS. 6) Only due to TCR IM.
Features
● Closed loop (compensated)
multirange 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
● 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.
Application Domain
● Industrial.
16196
IPN = 15 At
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110214/13 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice www.lem.com
EN 50178 EIC 61010-1
dCp, dCI, Rated insulation voltage Nominal voltage
Single insulation 600 V 600 V
Reinforced insulation 300 V 300 V
Current Transducer LTSR 15-NP
General data
TA Ambient operating temperature - 40 .. + 85 °C
TS Ambient storage temperature - 40 .. + 100 °C
m Mass 10 g
Standards 1) EN 50178: 1997
IEC 60950-1: 2001
Isolation characteristic
Vd Rms voltage for AC isolation test, 50 Hz, 1 min 3 kV
Vw Impulse withstand voltage 1.2/50 µs > 8 kV
Min
Ve Rms voltage for partial discharge extinction 10 pC > 1.5 kV
Min
dCp Creepage distance 2) 15.35 mm
dCI Clearance distance 3) 6.2 mm
CTI Comparative Tracking Index (group IIIa) 175
Applications examples
According to EN 50178 and CEI 61010-1 standards and following conditions:
● Over voltage category OV 3
● Pollution degree PD2
● Non-uniform eld
Notes: 1) On housing
2) On PCB with soldering pattern UTEC93-703.
Safety
This transducer must be used in electric/electronic equipment with respect to applicable
standards and safety requirements in accordance with the manufacturer’s operating
instructions.
Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous voltage (eg.
primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a built-in device, whose conducting parts must be inaccessible after
installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
Vw
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110214/13 LEM reserves the right to carry out modications on its transducers, in order to improve them, without prior notice www.lem.com
Number of
primary turns
Primary nominal
current rms
IPN [ A ]
Nominal 1)
output voltage
VOUT [ V ]
Primary
resistance
RP [ mW ]
Primary insertion
inductance
LP [ µH ]
Recommended
connections
1± 15 2.5 ± 0.625 0.18 0.013
6 5 4 OUT
IN 1 2 3
2± 7.5 2.5 ± 0.625 0.81 0.05
6 5 4 OUT
IN 1 2 3
3± 5 2.5 ± 0.625 1.62 0.12
6 5 4 OUT
IN 1 2 3
Dimensions LTSR 15-NP (in mm.)
Operation principle
Mechanical characteristics
● General tolerance ± 0.2 mm
● Fastening & connection of primary 6 pins 0.8 x 0.8 mm
Recommended PCB hole 1.3 mm
● Fastening & connection of secondary 4 pins 0.5 x 0.35 mm
Recommended PCB hole 0.8 mm
● Additional primary through-hole ∅ 3.2 mm
Remarks
●VOUT swings above the 2.5 V offset when IP ows from
terminals 1, 2, 3 to terminals 4, 5, 6 (with the arrow)
● For the EMC, the acceptance criteria are available on
request
● Temperature of the primary conductor should not exceed
100°C.
Note: 1) Output voltage when LTSR 15-NP is used with internal
reference.
Output Voltage - Primary Current
- IPM - IPN IPM
IPN
0
VOUT [ V ]
[ At ]
IP
4.5
5
2.5
3.125
0.5
1.875