LXSR 15-NPS

## **Current Transducer LXSR series** 

## _I_ **= 6, 15, 25 A** P N 

## **Ref: LXSR 6-NPS, LXSR 15-NPS, LXSR 25-NPS** 

For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit. 

## **Features** 

- ●Closed loop multi-range current transducer 

- ●Voltage output 

- ●Unipolar supply voltage 

- ●Compact design for PCB mounting. 

## **Advantages** 

- ●Very low offset drift 

## **Applications** 

   - ●AC variable speed 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 

   - ●Solar inverters. 

- ●Very good d _u_ / d _t_ immunity 

- ●LTSR footprint compatible 

- ●Reference pin with two modes: Ref IN and Ref OUT 

- ●Extended measuring range for unipolar measurement. 

## **Standards** 

- ●IEC 61800-1: 1997 

- ●IEC 61800-2: 2015 

- ●IEC 61800-3: 2004 

- ●IEC 61800-5-1: 2007 

- ●IEC 62109-1: 2010 

- ●IEC 62477-1: 2012 

- ●UL 508:2013. 

## **Application Domain** 

●Industrial. 

N°97.P2.09.000.0, N°97.P2.15.000.0, N°97.P2.19.000.0 

Page 1/19 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

10March2023/Version 4 

**LXSR series** 

## **Absolute maximum ratings** 

**==> picture [511 x 22] intentionally omitted <==**

**----- Start of picture text -----**<br>
Parameter Symbol Unit Value<br>**----- End of picture text -----**<br>


||**Symbol**|**Unit**|**Unit**|
|---|---|---|---|
|||||
|Maximum supply voltage|_U_C max|V|7|
|Maximum primary conductor temperature|_T_B max|°C|110|
|Maximum primary current|_I_P max|A|20 ×_I_P N|
|Maximum electrostatic discharge voltage|_U_ESD max|kV|4|



Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. 

## **UL 508: Ratings and assumptions of certification** 

File # E189713 Volume: 2 Section: 11 

## **Standards** 

- ●CSA C22.2 NO. 14-10 INDUSTRIAL CONTROL EQUIPMENT - Date 2011/08/01 

- ●UL 508 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Date 2013 

## **Ratings** 

**==> picture [511 x 20] intentionally omitted <==**

**----- Start of picture text -----**<br>
Parameter Symbol Unit Value<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Value**|
|---|---|---|---|
|||||
|Primary involved potential||V AC/DC|600|
|Max surrounding air temperature|_T_A|°C|105|
|Primary current|_I_P|A|According to series primary<br>currents|
|Secondary supply voltage|_U_C|V DC|7|
|Output voltage|_U_out|V|0 ... 5|



## **Conditions of acceptability** 

When installed in the end-use equipment, consideration shall be given to the following: 

- _1 - These devices must be mounted in a suitable end-use enclosure._ 

- _2 -  The terminals have not been evaluated for field wiring._ 

- _3 - The LES, LESR, LKSR, LPSR, LXS and LXSR Series shall be used in a pollution degree 2 environment or better._ 

- _4 -  Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as a transformer, optical isolator, limiting impedance or electro-mechanical relay) and having no direct connection back to the primary circuit (other than through the grounding means)._ 

- _5 -  These devices are intended to be mounted on the printed wiring board of the end-use equipment (with a minimum CTI of 100)._ 

- _6 -  LES, LESR, LKSR and LPSR Series: based on results of temperature tests, in the end-use application, a maximum of 110 °C cannot be exceeded on the primary jumper._ 

## **Marking** 

Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL’s FollowUp Service. Always look for the Mark on the product. 

Page 2/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Insulation coordination** 

**==> picture [512 x 24] intentionally omitted <==**

**----- Start of picture text -----**<br>
Parameter Symbol Unit Value Comment<br>**----- End of picture text -----**<br>


||**Symbol**|**Unit**|**Value**|**Value**|
|---|---|---|---|---|
||||||
|RMS voltage for AC insulation test, 50 Hz, 1 min|_U_d|kV|4.3||
|Impulse withstand voltage 1.2/50 μs|_U_Ni|kV|8||
|Insulation resistance|_R_INS|GΩ|18|measured at 500 V DC|
|Partial discharge RMS test voltage (_q_m< 10 pC)|_U_t|kV|1.65||
|Clearance (pri. - sec.)|_d_CI|mm|7.55|Shortest distance through air|
|Creepage distance (pri. - sec.)|_d_Cp|mm|7.55|Shortest path along device body|
|Case material|-|-|V0|According to UL 94|
|Comparative tracking index|_CTI_||600||
|Application example<br>System voltage||V|300|Reinforced insulation<br>according to IEC 61800-5-1<br>CAT III, PD2|
|Application example<br>System voltage||V|600|Basic insulation<br>according to IEC 61800-5-1<br>CAT III, PD2|



## **Environmental and mechanical characteristics** 

**==> picture [511 x 22] intentionally omitted <==**

**----- Start of picture text -----**<br>
Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Ambient operating temperature|_T_A|°C|−40||105||
|Ambient storage temperature|_T_A st|°C|−55||125||
|Mass|_m_|g||10|||



Page 3/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Electrical data LXSR 6-NPS** 

At _T_ A = 25 °C, _U_ C = +5 V, _N_ P = 1 turn, _R_ L = 10 kΩ internal reference, unless otherwise noted (see Definition of typical, minimum and maximum values paragraph in page 7). 

**==> picture [509 x 22] intentionally omitted <==**

**----- Start of picture text -----**<br>
Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|---|
|||||||||
|Primary nominal RMS current|_I_P N|A||6|||Apply derating according<br>tofgure 16|
|Primary current, measuring range|_I_P M|A|−20|||20||
|Number of primary turns|_N_P|||1, 2, 3||||
|Supply voltage|_U_C|V|4.75||5|5.25||
|Current consumption|_I_C|mA||18 +|)<br>(<br>~~_N_~~S<br>mA<br>_I_P<br>|)<br>(<br>_N_S<br>mA<br>_I_P<br>20.5 +|_N_S= 2000 turns|
|Reference voltage @_I_P= 0 A|_U_ref|V|2.485||2.5|2.515|Internal reference|
|External reference voltage|_U_ref|V|0.5|||2.75||
|Output voltage|_U_out|V|0.25|||4.75|with_U_C= +5 V|
|Output voltage @_I_P= 0 A|_U_out|V|||_U_ref|||
|Electrical ofset voltage|_U_O E|mV|−6.25|||6.25|100 % tested_U_out−_U_ref|
|Electrical ofset current<br>referred to primary|_I_O E|mA|−60|||60|100 % tested|
|Temperature coefcient of_U_ref<br>@_I_P= 0 A|_TCU_ref|ppm/K||||±70|Internal reference|
|Temperature coefcient of_U_out<br>@_I_P= 0 A|_TCU_out|ppm/K||||±14|ppm/K of 2.5 V<br>−40 °C … 105 °C|
|Nominal sensitivity|_S_N|mV/A||104.2|||625 mV/_I_P N|
|Sensitivity error|_εS_|%|−0.2|||0.2|100 % tested|
|Temperature coefcient of_S_|_TCS_|ppm/K||||±45|−40 °C … 105 °C|
|Linearity error|_ε_L|% of_I_P N|−0.1|||0.1||
|Magnetic ofset current (10 ×_I_P N)<br>referred to primary|_I_O M|mA|−25|||25||
|Noise voltage spectral density<br>100 Hz … 100 kHz referred to primary|_u_no|µV/Hz½||7||||
|Peak-to-peak noise voltage<br>DC … 10 kHz<br>DC … 100 kHz<br>DC … 1 MHz|_U_no pp|mVpp||11.1<br>13.2<br>13.3||||
|Delay time to 10 % of the fnal output<br>value for_I_P Nstep|_t_D 10|µs||||0.3|_R_L= 1 kΩ,d_i_/d_t_= 50 A/µs|
|Delay time to 90 % of the fnal output<br>value for_I_P Nstep|_t_D 90|µs||||0.4|_R_L= 1 kΩ,d_i_/d_t_= 50 A/µs|
|Frequency bandwidth (±3 dB)|_BW_|kHz|300||||_R_L= 1 kΩ|
|Total error|_ε_tot|% of_I_P N||||1.25||
|Total error @_T_A= 85 °C (105 °C)|_ε_tot|% of_I_P N||||1.25 (1.5)||
|Sum of sensitivity and linearity|_ε_S L|% of_I_P N||||0.45||
|Sum of sensitivity and linearity<br>@_T_A= 85 °C (105 °C)|_ε_S L|% of_I_P N||||0.75 (1)||



Page 4/19 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

10March2023/Version 4 

**LXSR series** 

## **Electrical data LXSR 15-NPS** 

At _T_ A = 25 °C, _U_ C = +5 V, _N_ P = 1 turn, _R_ L = 10 kΩ internal reference, unless otherwise noted (see Definition of typical, minimum and maximum values paragraph in page 7). 

**==> picture [510 x 22] intentionally omitted <==**

**----- Start of picture text -----**<br>
Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal RMS current|_I_P N|A||15||Apply derating according<br>tofgure 17|
|Primary current, measuring range|_I_P M|A|−51||51||
|Number of primary turns|_N_P|||1, 2, 3|||
|Supply voltage|_U_C|V|4.75|5|5.25||
|Current consumption|_I_C|mA||)<br>(<br>~~_N_~~S<br>mA<br>_I_P<br>18 +|)<br>(<br>_N_S<br>mA<br>_I_P<br>20.5 +|_N_S= 2000 turns|
|Reference voltage @_I_P= 0 A|_U_ref|V|2.485||2.515|Internal reference|
|External reference voltage|_U_ref|V|0.5||2.75||
|Output voltage|_U_out|V|0.25||4.75|with_U_C= +5 V|
|Output voltage @_I_P= 0 A|_U_out|V||_U_ref|||
|Electrical ofset voltage referred to<br>primary|_U_O E|mV|−2.5||2.5|100 % tested_U_out−_U_ref|
|Electrical ofset current<br>referred to primary|_I_O E|mA|−60||60|100 % tested|
|Temperature coefcient of_U_ref<br>@_I_P= 0 A|_TCU_ref|ppm/K|||±70|Internal reference|
|Temperature coefcient of_U_out<br>@_I_P= 0 A|_TCU_out|ppm/K|||±6|ppm/K of 2.5 V<br>−40 °C … 105 °C|
|Nominal sensitivity|_S_N|mV/A||41.67||625 mV/_I_P N|
|Sensitivity error|_εS_|%|−0.2||0.2|100 % tested|
|Temperature coefcient of_S_|_TCS_|ppm/K|||±45|−40 °C … 105 °C|
|Linearity error|_ε_L|% of_I_P N|−0.1||0.1||
|Magnetic ofset current (10 ×_I_P N)<br>referred to primary|_I_O M|mA|−45||45||
|Noise voltage spectral density<br>100 Hz … 100 kHz referred to primary|_u_no|µV/Hz½||3.5|||
|Peak-to-peak noise voltage<br>DC … 10 kHz<br>DC … 100 kHz<br>DC … 1 MHz|_U_no pp|mVpp||5<br>6.1<br>7.3|||
|Delay time to 10 % of the fnal output<br>value for_I_P Nstep|_t_D 10|µs|||0.3|_R_L= 1 kΩ,d_i_/d_t_= 50 A/µs|
|Delay time to 90 % of the fnal output<br>value for_I_P Nstep|_t_D 90|µs|||0.4|_R_L= 1 kΩ,d_i_/d_t_= 50 A/µs|
|Frequency bandwidth (±3 dB)|_BW_|kHz|300|||_R_L= 1 kΩ|
|Total error|_ε_tot|% of_I_P N|||0.7||
|Total error @_T_A= 85 °C (105 °C)|_ε_tot|% of_I_P N|||0.75 (1)||
|Sum of sensitivity and linearity|_ε_S L|% of_I_P N|||0.45||
|Sum of sensitivity and linearity<br>@_T_A= 85 °C (105 °C)|_ε_S L|% of_I_P N|||0.65 (0.75)||



Page 5/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Electrical data LXSR 25-NPS** 

At _T_ A = 25 °C, _U_ C = +5 V, _N_ P = 1 turn, _R_ L = 10 kΩ internal reference, unless otherwise noted (see Definition of typical, minimum and maximum values paragraph in page 7). 

**==> picture [513 x 21] intentionally omitted <==**

**----- Start of picture text -----**<br>
Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal RMS current|_I_P N|A||25||Apply derating according<br>tofgure 18|
|Primary current, measuring range|_I_P M|A|−85||85||
|Number of primary turns|_N_P|||1, 2, 3|||
|Supply voltage|_U_C|V|4.75|5|5.25||
|Current consumption|_I_C|mA||)<br>(<br>~~_N_~~S<br>mA<br>_I_P<br>18 +|)<br>(<br>_N_S<br>mA<br>_I_P<br>20.5 +|_N_S= 2000 turns|
|Reference voltage @_I_P= 0 A|_U_ref|V|2.485|2.5|2.515|Internal reference|
|External reference voltage|_U_ref|V|0.5||2.75||
|Output voltage|_U_out|V|0.25||4.75|with_U_C= +5 V|
|Output voltage @_I_P= 0 A|_U_out|V||_U_ref|||
|Electrical ofset voltage referred to<br>primary|_U_O E|mV|−1.5||1.5|100 % tested _U_out−  _U_ref|
|Electrical ofset current<br>referred to primary|_I_O E|mA|−60||60|100 % tested|
|Temperature coefcient of_U_ref<br>@_I_P= 0 A|_TCU_ref|ppm/K|||±70||
|Temperature coefcient of_U_out<br>@_I_P= 0 A|_TCU_out|ppm/K|||±4|ppm/K of 2.5 V<br>−40 °C … 105 °C|
|Nominal sensitivity|_S_N|mV/A||25||625 mV/_I_P N|
|Sensitivity error|_εS_|%|−0.2||0.2|100 % tested|
|Temperature coefcient of_S_|_TCS_|ppm/K|||±45|−40 °C … 105 °C|
|Linearity error|_ε_L|% of_I_P N|−0.1||0.1||
|Magnetic ofset current (10 ×_I_P N)<br>referred to primary|_I_O M|mA|−60||60||
|Noise voltage spectral density<br>100 Hz … 100 kHz referred to primary|_u_no|µV/Hz½||1.8|||
|Peak-to-peak noise voltage<br>DC … 10 kHz<br>DC … 100 kHz<br>DC … 1 MHz|_U_no pp|mVpp||2.3<br>4.3<br>4.5|||
|Delay time to 10 % of the fnal output<br>value for_I_P Nstep|_t_D 10|µs|||0.3|_R_L= 1 kΩ,d_i_/d_t_= 50 A/µs|
|Delay time to 90 % of the fnal output<br>value for_I_P Nstep|_t_D 90|µs|||0.4|_R_L= 1 kΩ,d_i_/d_t_= 50 A/µs|
|Frequency bandwidth (±3 dB)|_BW_|kHz|300|||_R_L= 1 kΩ|
|Total error|_ε_tot|% of_I_P N|||0.75||
|Total error @_T_A= 85 °C (105 °C)|_ε_tot|% of_I_P N|||0.85 (0.9)||
|Sum of sensitivity and linearity|_ε_S L|% of_I_P N|||0.45||
|Sum of sensitivity and linearity<br>@_T_A= 85 °C (105 °C)|_ε_S L|% of_I_P N|||0.65 (0.75)||



Page 6/19 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

10March2023/Version 4 

**LXSR series** 

## **Definition of typical, minimum and maximum values** 

Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown in “typical” graphs. 

On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval. 

Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that the probability for values of samples to lie in this interval is 99.73 %. 

For a normal (Gaussian) distribution, this corresponds to an interval between −3 sigma and +3 sigma. If “typical” values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an interval between −sigma and +sigma for a normal distribution. 

Typical, maximal and minimal values are determined during the initial characterization of the product. 

Page 7/19 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

10March2023/Version 4 

**LXSR series** 

## **Typical performance characteristics LXSR 6-NPS** 

**==> picture [505 x 170] intentionally omitted <==**

**----- Start of picture text -----**<br>
0.1<br>4 Rel. Sensitivity 20<br>Phase<br>2 10<br>0.05<br>0 0<br>−2 −10<br>0<br>−4 −20<br>−0.05 −6 −30<br>−8 −40<br>−0.1 −10 −50<br>−6 6 101 102 103 104 105 106<br>I P [A] Frequency [Hz]<br>]<br>I P N<br>Phase [°]<br>Linearity Error [ %<br>Relative Sensitivity [dB]<br>**----- End of picture text -----**<br>


Figure 1: Linearity error 

Figure 2: Frequency response 

**==> picture [505 x 393] intentionally omitted <==**

**----- Start of picture text -----**<br>
6 0.625<br>4 0.417<br>I P<br>U out− U ref<br>2 0.208<br>0 0<br>100 200 300 400 500<br>t  (µs)<br>Figure 3: Delay time<br>10000 3.5<br>3.4<br>600<br>3.3<br>1000 3.2<br>3.1<br>400 3.0<br>100 U P 2.9<br>U out<br>2.8<br>U ref<br>10 200 2.7<br>2.6<br>2.5<br>1 2.4<br>0 20 kV/µs<br>101 102 103 104 105 106 2.3<br>f c (Hz) 0 1 2 3 4 5 6 7 82.2<br>t  (µs)<br> (A) I P −      (V) UU outref<br>)  (V)<br>1/2 P<br>U<br>VRMS/ Hz  (V)<br> (µno U out<br>u<br>Primary Voltage<br>**----- End of picture text -----**<br>


Figure 4: Noise voltage spectral density 

Figure 5: d _u_ / d _t_ 

Page 8/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Typical performance characteristics LXSR 15-NPS** 

**==> picture [492 x 170] intentionally omitted <==**

**----- Start of picture text -----**<br>
0.1 0.1<br>0.05 0.05<br>0 0<br>−0.05 −0.05<br>−0.1−15 15 −0.1−15 15<br>I P [A] I P [A]<br>Linearity Error [ % ] I P N Linearity Error [ % ] I P N<br>**----- End of picture text -----**<br>


Figure 6: Linearity error 

Figure 7: Frequency response 

**==> picture [244 x 201] intentionally omitted <==**

**----- Start of picture text -----**<br>
15 0.625<br>10 0.417<br>I P<br>U out [−] U ref<br>5 0.208<br>0 0<br>100 200 300 400 500<br>t  (µs)<br>Figure 8: Delay time<br> (V)<br> (A) I P U − refout<br>U<br>**----- End of picture text -----**<br>


**==> picture [506 x 169] intentionally omitted <==**

**----- Start of picture text -----**<br>
10000 3.5<br>3.4<br>600<br>3.3<br>1000<br>3.2<br>3.1<br>100<br>400 3.0<br>U P 2.9<br>10 U out 2.8<br>U ref<br>200 2.7<br>1 2.6<br>2.5<br>2.4<br>0 20 kV/µs<br>101 102 103 104 105 106 2.3<br>f c (Hz) 0 1 2 3 4 5 6 7 82.2<br>t  (µs)<br>1/2)  (V)<br>U P<br>VRMS/ Hz  (V)<br>µ out<br> ( U<br>no<br>u<br>Primary Voltage<br>**----- End of picture text -----**<br>


Figure 9: Noise voltage spectral density 

Figure 10: d _u_ / d _t_ 

Page 9/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Typical performance characteristics LXSR 25-NPS** 

**==> picture [504 x 170] intentionally omitted <==**

**----- Start of picture text -----**<br>
0.1<br>4 Rel. Sensitivity 20<br>Phase<br>2 10<br>0.05<br>0 0<br>−2 −10<br>0<br>−4 −20<br>−0.05 −6 −30<br>−8 −40<br>−0.1 −10 −50<br>−25 25 101 102 103 104 105 106<br>I P [A] Frequency [Hz]<br>]<br>I P N<br>Phase [°]<br>Linearity Error [ %<br>Relative Sensitivity [dB]<br>**----- End of picture text -----**<br>


Figure 11: Linearity error 

Figure 12: Frequency response 

**==> picture [250 x 187] intentionally omitted <==**

**----- Start of picture text -----**<br>
30 0.750<br>25 0.625<br>20 0.500<br>15 0.375<br>I P<br>U out [−] U ref<br>10 0.250<br>5 0.125<br>0 0<br>100 200 300 400 500 600<br>t  (µs)<br> (V)<br> (A) I P U − refout<br>U<br>**----- End of picture text -----**<br>


Figure 13: Delay time 

**==> picture [505 x 173] intentionally omitted <==**

**----- Start of picture text -----**<br>
3.5<br>3.4<br>10000<br>600<br>3.3<br>3.2<br>1000<br>3.1<br>400 3.0<br>100 U P 2.9<br>U out<br>2.8<br>U ref<br>10 200 2.7<br>2.6<br>1 2.5<br>2.4<br>0 20 kV/µs<br>2.3<br>101 102 103 104 105 106 0 1 2 3 4 5 6 7 82.2<br>f c (Hz) t  (µs)<br> (V)<br>1/2) U P<br> (V)<br>out<br>U<br>VRMS/ Hz<br>µ<br> (<br>u no Primary Voltage<br>**----- End of picture text -----**<br>


Figure 14: Noise voltage spectral density 

Figure 15: d _u_ / d _t_ 

Page 10/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Maximum continuous DC primary current** 

**==> picture [219 x 156] intentionally omitted <==**

**----- Start of picture text -----**<br>
40<br>35<br>30<br>25<br>20<br>15<br>10<br>5<br>0<br>0 20 40 60 80 100 120 140<br>T A (°C)<br> (A)<br>I P<br>**----- End of picture text -----**<br>


Figure 16: _I_ P vs _T_ A for LXSR 6-NPS 

**==> picture [222 x 156] intentionally omitted <==**

**----- Start of picture text -----**<br>
100<br>90<br>80<br>70<br>60<br>50<br>40<br>30<br>20<br>10<br>0<br>0 20 40 60 80 100 120 140<br>T A (°C)<br> (A)<br>I P<br>**----- End of picture text -----**<br>


Figure 17: _I_ P vs _T_ A for LXSR 15-NPS 

**==> picture [222 x 156] intentionally omitted <==**

**----- Start of picture text -----**<br>
100<br>90<br>80<br>70<br>60<br>50<br>40<br>30<br>20<br>10<br>0<br>0 20 40 60 80 100 120 140<br>T A (°C)<br> (A)<br>I P<br>**----- End of picture text -----**<br>


Figure 18: _I_ P vs _T_ A for LXSR 25-NPS 

The maximum continuous DC primary current plot shows the boundary of the area for which all the following conditions are true: 

- _I_ P < _I_ P M 

- Junction temperature _T_ J < 125 °C 

- Primary conductor temperature < 110 °C 

- Max power dissipation of internal resistors < 0.5 × resistors nominal power 

## **Frequency derating** 

**==> picture [203 x 148] intentionally omitted <==**

**----- Start of picture text -----**<br>
I p AC derating<br>1.33<br>1<br>0.66<br>0.33<br>0<br>10 100 1k 10k 100k 1M<br>f c (Hz)<br>Max AC RMS current / Max DC RMS current<br>**----- End of picture text -----**<br>


Figure 19: Maximum RMS  AC primary current / maximum DC primary current vs frequency 

Page 11/19 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

10March2023/Version 4 

**LXSR series** 

## **Performance parameters definition** 

## **Ampere-turns and amperes** 

The transducer is sensitive to the primary current linkage _Θ_ P (also called ampere-turns). 

_Θ_ P = _N_ P· _I_ P (At) 

Where _N_ P is the number of primary turn (depending on the connection of the primary jumpers) 

Caution: As most applications will use the transducer with only one single primary turn ( _N_ P = 1), much of this datasheet is written in terms of primary current instead of current linkages. However, the ampere-turns (At) unit is used to emphasis that current linkages are intended and applicable. 

## **Simplified transducer model** 

The static model of the transducer at temperature _T_ A is: 

_U_ out = _S_ · _Θ_ P + _ε_ 

In which _ε_ = 

## **Electrical offset** 

The electrical offset voltage _U_ O E can either be measured when the ferro-magnetic parts of the transducer are: 

- ●Completely demagnetized, which is difficult to realize, 

- ●or in a known magnetization state, like in the current cycle shown in figure 21. 

Using the current cycle shown in figure 21, the electrical offset is: 

**==> picture [77 x 16] intentionally omitted <==**

The temperature variation _U_ O _T_ of the electrical offset voltage _U_ O E is the variation of the electrical offset from 25 °C to the considered temperature: 

**==> picture [92 x 8] intentionally omitted <==**

_U_ O E + _U_ O _T_ ( _T_ A) + _εS_ · _Θ_ P· _S_ + _ε_ L ( _Θ_ P max)· _Θ_ P max· _S_ + _TCS_ ·( _T_ A−25)· _Θ_ P· _S_ 

Note: the transducer has to be demagnetized prior to the application of the current cycle (for example with a demagnetization tunnel). 

With: _Θ_ P = _N_ P· _I_ P : primary current linkage (At) _Θ_ P max : max primary current linkage applied to demagnetization tunnel). the transducer _U_ S : output voltage  (V) _T_ A : ambient operating temperature (°C) _I_ O E : electrical offset voltage (V) _+ U_ C _U_ O _T_ ( _T_ A) : ttemperature variation of ~~_U_~~ O at temperature _T_ A (°C) _R_ M _U_ out _S_ : sensitivity of the transducer (V/At) _U_ ref _R_ L _TCS_ : temperature coefficient of _S εS_ : sensitivity error _ε_ L( _Θ_ P max) : linearity error for _Θ_ P max 

Figure 20: Test connection 

## **Magnetic offset** 

This model is valid for primary ampere-turns _Θ_ P between − _Θ_ P max and + _Θ_ P max only. 

## **Total error** 

The total error at 25 °C _ε_ tot is the error in the − _I_ P N … + _I_ P N  range, relative to the rated value _I_ P N. It includes: 

- ●the electrical offset _U_ O E 

- ●the sensitivity error _εS_ 

- ●the linearity error _ε_ L (to _I_ P N) 

The magnetic offset current _I_ O M is the consequence of a current o ~~n the primary side (“memory efe~~ ct” of the transducer’s ferromagnetic parts) ~~.~~ It i ~~s me~~ asured using the following primary current c ~~ycle~~ . _I_ O ~~M depen~~ ds on the current value _I_ P1 ( _I_ P1 > _I_ P M). 

**==> picture [181 x 131] intentionally omitted <==**

**----- Start of picture text -----**<br>
−<br>I  = U out( t 1 ) U out( t 2 ) · 1<br>O M 2 S<br>N<br>I P (DC)<br>I<br>P N<br>t 2<br>0 A<br>t 1  t<br>−<br>I<br>P1<br>**----- End of picture text -----**<br>


~~Figure 21:  Current~~ cycle used to measure magnetic and el ~~e~~ ctrical offset (transducer supplied) 

Page 12/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Performance parameters definition** 

## **Sensitivity and linearity** 

To measure sensitivity and linearity, the primary current (DC) is cycled from 0 to _I_ P, then to − _I_ P and back to 0 (equally spaced _I_ P/10 steps). The sensitivity _S_ is defined as the slope of the linear regression line for a cycle between ± _I_ P N. 

The linearity error difference between the measured points and the linear _ε_ L is the maximum positive or negative regression line, expressed in % of _I_ P N. 

## **Delay times** 

shown in figure 22.The delay time _t_ D 10 @ 10 % and the delay time _t_ D 90 @ 90 % are 

Both depend on the primary current d _i /_ d _t_ . They are measured at nominal ampere-turns. 

**==> picture [169 x 115] intentionally omitted <==**

**----- Start of picture text -----**<br>
I<br>100 %<br>90 %<br>I P U out<br>t D 90<br>10 %<br>t D 10 t<br>**----- End of picture text -----**<br>


Figure 22: _t_ D 10 (delay time @ 10 %) and _t_ D 90 (delay time @ 90 %). 

Page 13/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Application information** 

## **Filtering and decoupling** 

## **Supply voltage** _U_ C 

The transducer has internal decoupling capacitors, but in the case of a power supply with high impedance, it is highly recommended to provide local decoupling (100 nF or more, located close to the transducer) as it may reduce disturbance on transducer output _U_ out  and reference _U_ ref due to high varying primary current. The transducer power supply rejection ratio is low at high frequency. 

## **Output** _U_ out 

The output _U_ out has a very low output impedance of typically 1 Ohm; it can drive capacitive loads of up to 100 nF directly. Adding series resistance R _f_ of several tenths of Ohms allows much larger capacitive loads C _f_ (higher than 1 µF). Empirical evaluation may be necessary to obtain optimum results. The minimum load resistance on _U_ out is 1 kOhm. 

**==> picture [201 x 61] intentionally omitted <==**

**----- Start of picture text -----**<br>
+ U C<br>R M U out Rf<br>U ref Cf<br>**----- End of picture text -----**<br>


Figure 23: filtered _U_ out connection 

## **Total Primary Resistance** 

The primary resistance is 0.72 mΩ per conductor. 

In the following table, examples of primary resistance according to the number of primary turns. 

**==> picture [315 x 133] intentionally omitted <==**

**----- Start of picture text -----**<br>
Number of Nominal RMS Primary voltageOutput resistancePrimary Recommended<br>primary turns current U out R P  [m Ω ] connections<br>10       9         8       OUT<br>1 ± I P N U ref ±0.625 0.24<br>          IN         1        2         3<br>                10        9        8        OUT<br>2 ± I P N/2 U ref ±0.625 1.08<br>          IN         1        2         3<br>                10        9        8        OUT<br>3 ± I P N/3 U ref ±0.625 2.16<br>          IN         1        2         3<br>**----- End of picture text -----**<br>


Page 14/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **External reference voltage** 

The REF pin can be used either as a reference voltage output or as a reference voltage input. 

When used in reference voltage output, the internal reference voltage _U_ ref is used by the transducer as the reference point for bipolar measurements. 

The internal reference voltage output accuracy is defined in the electrical parameter data. 

When used in reference voltage input, an external reference voltage is connected to the REF pin. In this case, the maximun allowable reference voltage range is 0.5 V - 2.75 V. The REF pin must be able to source or sink an input current of 1.5 mA maximum. If the reference voltage is not used, the REF pin should be left unconnected. 

The following graphs show how the measuring range of each transducer version depends on the external reference voltage value _U_ ref. 

**==> picture [218 x 154] intentionally omitted <==**

**----- Start of picture text -----**<br>
50<br>40<br>30<br>20<br>10<br>2.75 V<br>0 ¦<br>−10<br>−20<br>−30<br>−40<br>−50<br>0.5 1 1.5 2 2.5 3<br>U ref (V)<br> (A)<br>I PM<br>**----- End of picture text -----**<br>


**==> picture [220 x 153] intentionally omitted <==**

**----- Start of picture text -----**<br>
120<br>100<br>80<br>60<br>40<br>20<br>2.75 V<br>0 ¦<br>−20<br>−40<br>−60<br>−80<br>−100<br>−120<br>0.5 1 1.5 2 2.5 3<br>U ref (V)<br> (A)<br>I PM<br>**----- End of picture text -----**<br>


Figure 24: Measuring range versus external _U_ ref 

Upper limit: _I_ P = −9.6 * _U_ ref + 45.6            ( _U_ ref = 0.5 … 2.75 V) Lower limit: _I_ P = −9.6 * _U_ ref + 2.4              ( _U_ ref = 0.5 … 2.75 V) 

Figure 25: Measuring range versus external _U_ ref 

Upper limit: _I_ P = −24 * _U_ ref + 114 ( _U_ ref = 0.5 … 2.75 V) Lower limit: _I_ P = −24 * _U_ ref + 6 ( _U_ ref = 0 … 2.75 V) 

Page 15/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **External reference voltage** 

**==> picture [245 x 170] intentionally omitted <==**

**----- Start of picture text -----**<br>
130<br>110<br>90<br>70<br>50<br>30<br>10 2.75 V<br>¦<br>−10<br>−30<br>−50<br>−70<br>−90<br>−110<br>−130<br>0.5 1 1.5 2 2.5 3<br>U ref (V)<br> (A)<br>I PM<br>**----- End of picture text -----**<br>


Figure 26: Measuring range versus external _U_ ref LXSR 25-NP 

Upper limit: _I_ P = −40 * _U_ ref + 190            ( _U_ ref = 1.85 … 2.75 V) Upper limit: _I_ P = 113                              ( _U_ ref = 0 … 1.85 V) Lower limit: _I_ P = −40 * _U_ ref + 10              ( _U_ ref = 0 … 2.75 V) 

_Example with U_ ref _= 1.65_ V _:_ 

- ●The 6 A version has a measuring range from −13.44 A to +29.76 A 

- ●The 15 A version has a measuring range from −33.6 A to +74.4 A 

- ●The 25 A version has a measuring range from −56 A to +113 A 

_Example with U_ ref _= 0.5_ V _:_ 

- ●The 6 A version has a measuring range from −2.4 A to +40.8 A 

- ●The 15 A version has a measuring range from −6 A to +102 A 

- ●The 25 A version has a measuring range from −10 A to +113 A 

Page 16/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **PCB footprint** 

**==> picture [263 x 138] intentionally omitted <==**

## **Assembly on PCB** 

- ●Recommended PCB hole diameter 

- ●Maximum PCB thickness 

- ●Wave soldering profile No clean process only. 

1.3 mm for primary pin 0.8 mm for secondary pin 

- 2.4 mm 

maximum 260 °C for 10 s 

## **Safety** 

This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. 

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 (e.g. 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. 

Page 17/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Dimensions** (in mm) 

**==> picture [512 x 522] intentionally omitted <==**

**----- Start of picture text -----**<br>
Connection<br>+ U C<br>R M U out<br>U ref<br>Mechanical characteristic<br>●General tolerance  ±0.25 mm<br>**----- End of picture text -----**<br>


Page 18/19 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

10March2023/Version 4 

**LXSR series** 

## **Packaging information** 

Standard delivery in cardboard:  L × W × H: 315 × 200 × 120 mm 

Each carboard contains 150 parts, placed into 3 Polystyrene-made trays of 50 parts each one. Both trays and carboard are ESD-compliant. 

The typical weight of the cardboard is 2.5 Kg. 

**==> picture [477 x 311] intentionally omitted <==**

Page 19/19 

LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

10March2023/Version 4