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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).
IPN = 25 At
16171
Electrical data
IPN IPM VOUT VREF G NS RL C Lmaxi R IM TCR IM VC IC X Primary nominal current rms Primary current, measuring range Output voltage (Analog) @ IP IP = 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 @ VC = 5 V Typ Accuracy @ IPN , TA = 25C Accuracy with R IM @ IPN , TA = 25C Linearity error 25 At 0 .. 80 1) At 2.5 (0.625*IP/IPN) V 2.5 2) V 2.5 3) V 1.9 .. 2.7 4) V 25 mV/A 2000 2 k 500 pF 50 < 50 ppm/K 5 V 28 + IS5)+ (VOUT/RL) mA 0.2 0.7 < 0.1 Maxi TCVOUT Temperature coefficient of VOUT / VREF @ IP = 0 - 40C .. + 85C TCG Temperature coefficient of G - 40C .. + 85C VOM Magnetic offset voltage @ IP = 0, after an overload of 3 x IPN 5 x IPN 10 x IPN TCVREF Temperature coefficient VREF @ IP = 0 - 10C .. + 85C - 40C .. - 10C tra Reaction time @ 10 % of IPN tr Response time to 90 % of IPN 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
% % %
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/s 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) VOUT is linked to VREF, by conception the difference between these two nodes for IP = 0 is maximum 25 mV, 2.475 < VOUT < 2.525 V. 3) In Refout mode at TA = 25C, 2.475 V< VREF < 2.525 V. The minimal impedance loading the ref pin should be > 220 k. Internal impedance = 600 . 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) 6)
Application Domain
* Industrial.
Copyright protected
IS = IP/N S
Only due to TCR IM.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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Current Transducer LTSR 25-NP General data
TA TS m Ambient operating temperature Ambient storage temperature Mass Standards - 40 .. + 85 C - 40 .. + 100 C 10 g EN 50178: 1997 I EC 60950-1: 2001
Isolation characteristics
Vd Vw Ve dCp dCl CTI Rms voltage for AC isolation test, 50 Hz, 1 min Impulse withstand voltage 1.2/50 s Rms voltage for partial discharge extinction @ 10pC Creepage distance 7) Clearance distance 8) Comparative Tracking Index (Group III a) 3 >8 > 1.5 Mini 15.35 6.2 175 kV kV kV mm mm
Application examples
According to EN 50178 and IEC 61010-1 standards and following conditions:
* Over voltage category OV 3 * Pollution degree PD2 * Non-uniform field
EN 50178 dCp, dCI, V w Single isolation Reinforced isolation Rated isolation voltage 600 V 300 V IEC 61010-1 Nominal voltage 600 V 300 V
Notes:
7) 8)
On housing 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.
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
Dimensions LTSR 25-NP
(in mm. 1 mm = 0.0394 inch)
Bottom view
Operation principle
Model + SP number
Back view
Number of primary turns Primary nominal current rms IPN [ A ] 25 Nominal9) output voltage VOUT [ V ] 2.5 0.625
Right view
Primary resistance R P [ m ] 0.18
Date code
Front view
Recommended connections 6 5 2 5 2 5 2 4 3 4 3 4 3 OUT
Primary insertion inductance L P [ H ] 0.013 IN 1 6 1 6 1
1
OUT
2
12
2.5 0.600
0.81
0.05 IN OUT
3
8
2.5 0.600
1.62
0.12 IN
Mechanical characteristics
* General tolerance * Fastening & connection of primary Recommended PCB hole * Fastening & connection of secondary Recommended PCB hole * Additional primary through-hole 0.2 mm 6 pins 0.8 x 0.8 mm 1.3 mm 4 pins 0.5 x 0.35 mm 0.8 mm 3.2 mm
Output Voltage - Primary Current
VOUT [ V ]
5 4.5 3.125 2.5 1.875 0.5
Remarks
* VOUT is positive when IP flows from terminals 1, 2, 3 to terminals 6, 5, 4 * For the EMC, the acceptance criteria are available on request. * Temperature of the primary jumper should not exceed 100 [C].
Note:
9)
Output voltage when LTSR 25-NP is used with internal reference.
- IPmaxi
- IPN 0
IPN
IPmaxi
IP [ At ]
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com

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