LTSR 25-NP

**I = 25 At PN** 

## **Current Transducer LTSR 25-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). 

16171 

## ~~**Electrical data**~~ 

## **Features** 

|**I**PN<br>**I**PM<br>**Î**P|Primary nominal current rms<br>Primary current, measuring range<br>Overload capability|25<br>0 .. ± 80<br>250|0 .. ± 801)|At<br>At<br>At|
|---|---|---|---|---|
|**V**OUT|Output voltage (Analog) @**I**P|2.5 ± (0.625·**I**P/**I**PN) V|||
|**V**REF<br>**G**|IP= 0<br>Reference voltage (internal reference), RefOUTmode<br>Reference voltage (external reference), RefINmode<br>Sensitivity|2.52)<br>2.53)<br>1.9 .. 2.7<br>25|1.9 .. 2.74)|V<br>V<br>V<br>mV/A|
|**N **S|Number of secondary turns (± 0.1 %)|2000|2000||
|**R**L|Load resistance|≥2||kW|
|**C**L max|Maximum capacitive loading|500||pF|
|**R**IM|Internal measuring resistance (± 0.5 %)|50||W|
|**TCR**IM<br>**V**C|Temperature coefficient of**R**IM<br>Supply  voltage (± 5 %)|< 50<br>5|< 50|ppm/K<br>V|
|**I**C|Current consumption @**V**C= 5 V<br>Typ|28+**I**S<br>5)+(**V**OUT**R**/L)  mA|||
|~~**Accuracy - Dynamic performance data**~~|||||
|**X**|Accuracy @**I**PN,**T**A= 25°C<br>Accuracy with**R**IM@**I**PN,**T**A= 25°C|± 0.2<br>± 0.7|± 0.2<br>± 0.7|%<br>%|
|eL|Linearity error|< 0.1|< 0.1|%|
|**TCV**OUT|OUTTemperature coefficient of**V**OUT/**V**REF@**I**P= 0|Max|||
||- 40°C .. + 85°C|37.5||ppm/K|
|**TCG**|Temperature coefficient of**G**<br>- 40°C .. + 85°C<br>50|506)||ppm/K|
|**V**OM|Magnetic offset voltage @**I**P= 0,||||
||after an overload of  3 x**I**PN|± 0.5|± 0.5|mV|
||5 x**I**PN<br>10 x**I**PN|± 2.0<br>± 2.0|± 2.0<br>± 2.0|mV<br>mV|
|**TCV**REF|Temperature coefficient of internal**V**REF||||
||@**I**P= 0<br>- 10°C .. + 85°C|50||ppm/K|
||- 40°C .. - 10°C|100||ppm/K|
|**t**ra|Reaction time @ 10 % of**I**PN|< 100||ns|
|**t**r|Response time to 90 % of**I**PNstep|< 400||ns|
|**di/dt**|di/dt accurately followed|> 60||A/µs|
|**BW**|Frequency bandwidth (0 .. - 0.5 dB)|DC .. 100|DC .. 100|kHz|
||(- 0.5 .. 1 dB)|DC .. 200|DC .. 200|kHz|
|Notes:1)Only in refOUTmode or with external REF less than 2.525 V and greater than<br>2.475 V. For external REF out of these limits see leaflet.2) **V**OUTis linked to**V**REF, by<br>conception the difference between these two nodes for**I**P = 0 is maximum ± 25 mV,|||||
|2.475 V <<br>|2.475 V <**V**OUT< 2.525 V. 3)In RefOUTmode at**T**A = 25°C, 2.475 V<**V**REF<br> < 2.525 V. The minimal impedance loading the ref pin should be > 220 kW. Internal||||
|impedance = 600|impedance = 600W. For most applications you need to buffer this output to feed it||||
|into an ADC for example.|into an ADC for example.4)To overdrive the REF (1.9 V .. 2.7 V) max ± 1 mA is||||
|needed.|needed.5) **I**S=**I**P/**N**S.6)Only due to**TCR**IM.||||



- ●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. 

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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

110214/10 

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## **Current Transducer LTSR 25-NP** 

## ~~**General data**~~ 

|**T**A|Ambient operating temperature|- 40 .. + 85|°C|
|---|---|---|---|
|**T**S|Ambient storage temperature|- 40 .. + 100|°C|
|**_m_**|Mass|10|g|
||Standards1)|EN 50178: 1997||
|||IEC 60950-1: 2001||
|~~**Isolation characteristic**~~||||
|**V**d|Rms voltage for AC isolation test, 50 Hz, 1 min|3|kV|
|**V**w|Impulse withstand voltage 1.2/50 µs|> 8|kV|
|||Min||
|**V**e|Rms voltage for partial discharge extinction  10 pC|> 1.5|kV|
|||Min||
|**d**Cp|Creepage distance1)|15.35|mm|
|**d**CI|Clearance distance2)|6.2|mm|
|**C**TI|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 field 

|Pollution degree PD2<br>Non-uniform feld|||
|---|---|---|
||**EN 50178**|**EIC 61010-1**|
|dCp, dCI,<br>**V**w|Rated insulation voltage|Nominal voltage|
|Single insulation|600 V|600 V|
|Reinforced insulation|300 V|300 V|



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. 

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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

110214/10 

www.lem.com 

**Dimensions LTSR 25-NP** (in mm.) 

**==> picture [511 x 292] intentionally omitted <==**

**----- Start of picture text -----**<br>
Operation principle<br>**----- End of picture text -----**<br>


|Number of<br>primary turns|Primary nominal<br>current rms<br>**I**PN[ A ]|Nominal1)<br>output voltage<br>**V**OUT[ V ]|Primary<br>resistance<br>**R**P[ mW]|Primary insertion<br>inductance<br>**L**P[ µH ]|Recommended<br>connections|
|---|---|---|---|---|---|
||||||6        5        4        OUT|
|1|± 25|2.5 ± 0.625|0.18|0.013||
||||||IN        1        23|
||||||6        5        4        OUT|
|2|± 12|2.5 ± 0.600|0.81|0.05||
||||||IN        1        2        3|
||||||6        5        4        OUT|
|3|± 8|2.5 ± 0.600|1.62|0.12||
||||||IN        1        2        3|



## **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** 

- **V** OUT swings above the 2.5 V offset when IP flows 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. 

## **Output Voltage - Primary Current** 

**==> picture [231 x 152] intentionally omitted <==**

**----- Start of picture text -----**<br>
 VOUT  [[ ][V][ ]]<br> 5<br> 4.5<br>3.125<br>2.5<br>1.875<br>0.5<br>  IP [ At ]<br>- IPM  - IPN   0   IPN  IPM<br>**----- End of picture text -----**<br>


Note: 1) Output voltage when LTSR 25-NP is used with internal reference. 

Page 3/3 

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

110214/10 

www.lem.com