LTS 25-NP

## **Current Transducer LTS 25-NP** 

## **I = 25 At** PN 

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). 

16054 

## **Electrical data** 

## **Features** 

|**I**PN|Primary nominal current rms||25|At|
|---|---|---|---|---|
|**I**PM|Primary current, measuring range||0 .. ± 80|At|
|**V**OUT|Output voltage (Analog) @**I**P||2.5 ± (0.625·**I**P/**I**PN) V||
||**I**P= 0||2.51)|V|
|**G**|Sensitivity||25|mV/A|
|**N **S|Number of secondary turns (± 0.1 %)||2000||
|**R**L|Load resistance||≥2|kW|
|**R**IM|Internal measuring resistance (± 0.5 %)||50|W|
|**TCR**IM|Temperature coefficient of**R**IM||< 50|ppm/K|
|**V**C|Supply  voltage (± 5 %)||5|V|
|**I**C|Current consumption @**V**C= 5 V|Typ|28+**I**S<br>2)+(**V**OUT/**R**L) mA||



## **Accuracy - Dynamic performance data** 

- ●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. 

## **Advantages** 

- ●Excellent accuracy 

|**X**|Accuracy @**I**PN,**T**A= 25°C||± 0.2|± 0.2|± 0.2|%|
|---|---|---|---|---|---|---|
||Accuracy with**R**IM@**I**PN,**T**A= 25°C||± 0.7||± 0.7|%|
|εL|Linearity error||< 0.1||< 0.1|%|
||||Typ|Typ|Max||
|**TCV**OUTTemperature coefficient of**V**OUT@**I**P= 0- 10°C .. + 85°C  50|||- 10°C .. + 85°C  50|- 10°C .. + 85°C  50|100 ppm/K||
|||- 40°C ..  - 10°C|- 40°C ..  - 10°C|- 40°C ..  - 10°C|150 ppm/K||
|**TCG**|Temperature coefficient of**G**|- 40°C .. + 85°C|- 40°C .. + 85°C|- 40°C .. + 85°C|50 3)ppm/K||
|**V**OM|Magnetic offset voltage @**I**P= 0,||||||
||after an overload of 3 x**I**PN<br>5 x**I**PN||||± 0.5<br>± 2.0|mV<br>mV|
|||10 x**I**PN|||± 2.0|mV|
|**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|
|**General data**|||||||
|**T**A|Ambient operating temperature||- 40 .. + 85|||°C|
|**T**S|Ambient storage temperature||- 40.. + 100||- 40.. + 100|°C|
|**_m_**|Mass<br>Standards||10<br>g<br>EN 50178: 1997||||
||||IEC 60950-1: 2001|||IEC 60950-1: 2001|
|Notes:|1)Absolute value @**T**A=25°C, 2.475 <**V**OUT< 2.525||||||
||2) **I**S=**I**P/**N**S||||||
||3)Only due to**TCR**IM.||||||



- ●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. 

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

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110209/22 

www.lem.com 

## **Current Transducer LTS 25-NP** 

|**Isolation characteristics**|**Isolation characteristics**|||
|---|---|---|---|
|**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 @ 10pC|> 1.5|kV|
|**dCp**|Creepage distance1)|15.5|mm|
|**dCI**|Clearance distance2)|6.35|mm|
|**CTI**|Comparative Tracking Index (group IIIa)|175||



Notes:[1)] On housing 

2) On PCB with soldering pattern UTEC93-703. 

## **Applications 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**|**IEC 61010-1**|
|---|---|---|
|**dCp**,**dCI**,<br>**V**w|Rated insulation voltage|Nominal voltage|
|Single insulation|600 V|600 V|
|Reinforced insulation|300 V|300 V|



## **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 build-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 

110209/22 

www.lem.com 

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

## **Operation principle** 

**==> picture [481 x 311] intentionally omitted <==**

|Number of<br>primary turn<br>1<br>2<br>3|s<br>Primary nominal<br>current rms<br>**I**PN[ A ]|Nominal<br>output voltage<br>**V**OUT[ V ]|Primary<br>resistance<br>**R**P[ mW]|<br>Primary insertion<br>inductance<br>**L**P[ µH ]<br>Recommended<br>connections|
|---|---|---|---|---|
||± 25|2.5 ± 0.625|0.18|0.013<br>6        5        4<br>IN        1        23|
||± 12|2.5 ± 0.600|0.81|0.05<br>6        5        4<br>IN        1        2        3<br>6        5         4|
||± 8|2.5 ± 0.600|1.62|0.12<br>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 3 pins 0.5 x 0.35 mm Recommended PCB hole 0.8 mm 

- ●Additional primary through-hole Ø 3.2mm 

## **Remarks** 

- **V** OUT  swings above 2.5 V when **I** P flows from terminals 1, 2, 3 to terminals 6, 5, 4 (with the arrow). 

- ●Temperature of the primary jumper should not exceed 100°C. 

## **Output Voltage - Primary Current** 

**==> picture [176 x 117] 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>


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

110209/22 

www.lem.com