LEM USA Inc. 的 LPSR Series 规格书

w" LEMO 7m“
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N°97.P3.09.000.0, N°97.P3.15.000.0, N°97.P3.19.000.0, N°97.P3.25.000.0
Current Transducer LPSR series IP N = 6, 15, 25, 50 A
Ref: LPSR 6-NP, LPSR 15-NP, LPSR 25-NP, LPSR 50-NP
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
● Overcurrent detect at 4.1 × IP N.
Advantages
● Very low offset drift
●Very good dv/dt immunity
● Reference pin with two modes: Ref IN and Ref OUT
● Extended measuring range for unipolar measurement.
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.
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.
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LPSR series
Absolute maximum ratings
Parameter Symbol Unit Value
Maximum supply voltage UC max V 7
Maximum primary conductor temperature TB max °C 110
Maximum primary current IP max A20 × IP N
Maximum electrostatic discharge voltage UESD 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
Parameter Symbol Unit Value
Primary involved potential V AC/DC 1000
Max surrounding air temperature TA°C 105
Primary current IPAAccording to series primary
currents
Secondary supply voltage UCV DC 7
Output voltage Vout V0 to 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 Follow-
Up Service. Always look for the Mark on the product.
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LPSR series
Insulation coordination
Parameter Symbol Unit Value Comment
RMS voltage for AC insulation test, 50 Hz, 1 min UdkV 4.3
Impulse withstand voltage 1.2/50 μs ÛWkV 8
Insulation resistance RINS GΩ 18 measured at 500 V DC
Partial discharge RMS test voltage (qm < 10 pC) UtkV 1.65
Clearance (pri. - sec.) dCI mm See dimensions drawing on
page 19
Creepage distance (pri. - sec.) dCp
Case material - - V0 according to
UL 94
Comparative tracking index CTI 600
Application example V600 V
CAT III, PD2
Reinforced insulation, non
uniform field according to
IEC 61800-5-1
Application example V1000 V
CAT III, PD2
Basic insulation, non uniform
field according to IEC 61800-
5-1
Environmental and mechanical characteristics
Parameter Symbol Unit Min Typ Max Comment
Ambient operating temperature TA°C −40 105
Ambient storage temperature TS°C −55 125
Mass mg10
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LPSR series
Electrical data LPSR 6-NP
At TA = 25 °C, UC = +5 V, NP = 1 turn, RL = 10 kΩ internal reference, unless otherwise noted (see Definition of typical, minimum and
maximum values paragraph in page 18).
Parameter Symbol Unit Min Typ Max Comment
Primary nominal RMS current IP N A6Apply derating according to
fig. 21
Primary current, measuring range IP M A−20 20
Number of primary turns NP1, 2, 3, 4
Supply voltage UCV4.75 55.25
Current consumption ICmA
)
(
N
mA
I
S
P
17 +
)
(
N
mA
I
S
P
20 + NS = 2000 turns
Reference voltage @ IP = 0 A Vref V2.485 2.5 2.515 Internal reference
External reference voltage Vref V0.5 2.75
Output voltage Vout V0.25 4.75 with UC = +5 V
Output voltage @ IP = 0 A Vout VVref
Electrical offset voltage VO E mV −5 5100 % tested Vout − Vref
Electrical offset current
referred to primary IO E mA −48 48 100 % tested
Temperature coefficient of Vref @ IP = 0 A TCVref ppm/K ±70 Internal reference
Temperature coefficient of Vout @ IP = 0 A TCVout ppm/K ±14 ppm/K of 2.5 V
−40 °C … 105 °C
Theoretical sensitivity Gth mV/A 104.2 625 mVIP N
Sensitivity error εG%−0.2 0.2 100 % tested
Temperature coefficient of GTCG ppm/K ±40 −40 °C … 105 °C
Linearity error εL% of IP N −0.1 0.1
Magnetic offset current (10 × IP N)
referred to primary IO M mA −25 25
Output RMS voltage noise spectral
density 100 … 100 kHz referred to
primary
eno µV/Hz½ 7
Output voltage noise
DC … 10 kHz
DC … 100 kHz
DC … 1 MHz
Vno mVpp
10.5
13.4
13.6
Primary current, detection threshold IP Th A4.02 × IP N 4.1 × IP N 4.17 × IP N
Overcurrent detection response time tr Th µs 1.4 2.2
Overcurrent detection
measured over temperature
−40 °C … 105 °C with a IP
step of 5 × IP N and di/dt =
50 A/µs
Overcurrent detection hold time thold Th ms 1
Reaction time @ 10 % of IP N tra µs 0.3 RL = 1 kΩ, di/dt = 50 A/µs
Step response time to 90 % of IP N trµs 0.4 RL = 1 kΩ, di/dt = 50 A/µs
Frequency bandwidth (±1 dB) BW kHz 300 RL = 1 kΩ
Overall accuracy XG% of IP N 1.25
Overall accuracy @ TA = 85 °C (105 °C) XG% of IP N 1.25 (1.5)
Accuracy X% of IP N 0.5
Accuracy @ TA = 85 °C (105 °C) X% of IP N 0.75 (1)
HIM) 1 (MA)
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LPSR series
Electrical data LPSR 15-NP
At TA = 25 °C, UC = +5 V, NP = 1 turn, RL = 10 kΩ internal reference, unless otherwise noted (see Definition of typical, minimum and
maximum values paragraph in page 18).
Parameter Symbol Unit Min Typ Max Comment
Primary nominal RMS current IP N A15 Apply derating according to
fig. 22
Primary current, measuring range IP M A−51 51
Number of primary turns NP1, 2, 3, 4
Supply voltage UCV4.75 55.25
Current consumption ICmA
)
(
N
mA
I
S
P
17 +
)
(
N
mA
I
S
P
20 + NS = 2000 turns
Reference voltage @ IP = 0 A Vref V2.485 2.5 2.515 Internal reference
External reference voltage Vref V0.5 2.75
Output voltage Vout V0.25 4.75 with UC = +5 V
Output voltage @ IP = 0 A Vout VVref
Electrical offset voltage VO E mV −1.75 1.75 100 % tested Vout − Vref
Electrical offset current
referred to primary IO E mA −42 42 100 % tested
Temperature coefficient of Vref @ IP = 0 A TCVref ppm/K ±70 Internal reference
Temperature coefficient of Vout @ IP = 0 A TCVout ppm/K ±6 ppm/K of 2.5 V
−40 °C … 105 °C
Theoretical sensitivity Gth mV/A 41.67 625 mVIP N
Sensitivity error εG%−0.2 0.2 100 % tested
Temperature coefficient of GTCG ppm/K ±40 −40 °C … 105 °C
Linearity error εL% of IP N −0.1 0.1
Magnetic offset current (10 × IP N)
referred to primary IO M −45 45
Output RMS voltage noise spectral
density 100 … 100 kHz referred to
primary
eno µV/Hz½ 3.5
Output voltage noise
DC … 10 kHz
DC … 100 kHz
DC … 1 MHz
Vno mVpp
4.5
5.7
6.3
Primary current, detection threshold IP Th A4.02 × IP N 4.1 × IP N 4.17 × IP N
Overcurrent detection response time tr Th µs 1.4 2.2
Overcurrent detection
measured over temperature
−40 °C … 105 °C with a IP
step of 5 × IP N and di/dt =
50 A/µs
Overcurrent detection hold time thold Th ms 1
Reaction time @ 10 % of IP N tra µs 0.3 RL = 1 kΩ, di/dt = 50 A/µs
Step response time to 90 % of IP N trµs 0.4 RL = 1 kΩ, di/dt = 50 A/µs
Frequency bandwidth (±3 dB) BW kHz 300 RL = 1 kΩ
Overall accuracy XG% of IP N 0.75
Overall accuracy @ TA = 85 °C (105 °C) XG% of IP N 0.75 (1)
Accuracy X% of IP N 0.5
Accuracy @ TA = 85 °C (105 °C) X% of IP N 0.65 (0.75)
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LPSR series
Electrical data LPSR 25-NP
At TA = 25 °C, UC = +5 V, NP = 1 turn, RL = 10 kΩ internal reference, unless otherwise noted (see Definition of typical, minimum and
maximum values paragraph in page 18).
Parameter Symbol Unit Min Typ Max Comment
Primary nominal RMS current IP N A25 Apply derating according
to fig. 23
Primary current, measuring range IP M A−85 85
Number of primary turns NP1, 2, 3, 4
Supply voltage UCV4.75 55.25
Current consumption ICmA
)
(
N
mA
I
S
P
17 +
)
(
N
mA
I
S
P
20 + NS = 2000 turns
Reference voltage @ IP = 0 A Vref V2.485 2.5 2.515 Internal reference
External reference voltage Vref V0.5 2.75
Output voltage Vout V0.25 4.75 with UC = +5 V
Output voltage @ IP = 0 A Vout VVref
Electrical offset voltage VO E mV −1 1100 % tested Vout − Vref
Electrical offset current
referred to primary IO E mA −40 40 100 % tested
Temperature coefficient of Vref @ IP = 0 A TCVref ppm/K ±70 Internal reference
Temperature coefficient of Vout @ IP = 0 A TCVout ppm/K ±4 ppm/K of 2.5 V
−40 °C … 105 °C
Theoretical sensitivity Gth mV/A 25 625 mVIP N
Sensitivity error εG%−0.2 0.2 100 % tested
Temperature coefficient of GTCG ppm/K ±40 −40 °C … 105 °C
Linearity error εL% of IP N −0.1 0.1
Magnetic offset current (10 × IP N)
referred to primary IO M mA −60 60
Output RMS voltage noise spectral
density 100 … 100 kHz referred to
primary
eno µV/Hz½ 1.8
Output voltage noise
DC … 10 kHz
DC … 100 kHz
DC … 1 MHz
Vno mVpp
2.6
3.9
5.1
Primary current, detection threshold IP Th A4.02 × IP N 4.1 × IP N 4.17 × IP N
Overcurrent detection response time tr Th µs 1.4 2.2
Overcurrent detection
measured over
temperature −40 °C … 105
°C with a IP step of 5 × IP N
and di/dt = 50 A/µs
Overcurrent detection hold time thold Th ms 1
Reaction time @ 10 % of IP N tra µs 0.3 RL = 1 kΩ, di/dt = 50 A/µs
Step response time to 90 %of IP N trµs 0.4 RL = 1 kΩ, di/dt = 50 A/µs
Frequency bandwidth (±3 dB) BW kHz 300 RL = 1 kΩ
Overall accuracy XG% of IP N 0.8
Overall accuracy @ TA = 85 °C (105 °C) XG% of IP N 0.85 (0.9)
Accuracy X% of IP N 0.5
Accuracy @ TA = 85 °C (105 °C) X% of IP N 0.65 (0.75)
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LPSR series
Electrical data LPSR 50-NP
At TA = 25 °C, UC = +5 V, NP = 1 turn, RL = 10 kΩ internal reference, unless otherwise noted (see Definition of typical, minimum and
maximum values paragraph in page 18).
Parameter Symbol Unit Min Typ Max Comment
Primary nominal RMS current IP N A50 Apply derating according to
fig. 24
Primary current, measuring range IP M A−150 150
Number of primary turns NP1, 2, 3, 4
Supply voltage UCV4.75 55.25
Current consumption ICmA
)
(
N
mA
I
S
P
17 +
)
(
N
mA
I
S
P
20 + NS = 1600 turns
Reference voltage @ IP = 0 A Vref V2.485 2.5 2.515 Internal reference
External reference voltage Vref V0.5 2.75
Output voltage Vout V0.25 4.75 with UC = +5 V
Output voltage @ IP = 0 A Vout VVref
Electrical offset voltage VO E mV −0.7 0.7 100 % tested Vout − Vref
Electrical offset current
referred to primary IO E mA −56 56 100 % tested
Temperature coefficient of Vref
@ IP = 0 A TCVref ppm/K ±70 Internal reference
Temperature coefficient of Vout
@ IP = 0 A TCVout ppm/K ±3 ppm/K of 2.5 V
−40 °C … 105 °C
Theoretical sensitivity Gth mV/A 12.5 625 mVIP N
Sensitivity error εG%−0.2 0.2 100 % tested
Temperature coefficient of GTCG ppm/K ±40 −40 °C … 105 °C
Linearity error εL% of IP N −0.1 0.1
Magnetic offset current (10 × IP N)
referred to primary IO M mA −60 60
Output RMS voltage noise spectral
density 100 … 100 kHz referred to
primary
eno µV/Hz½ 1.7
Output voltage noise
DC … 10 kHz
DC … 100 kHz
DC … 1 MHz
Vno mVpp
2.4
3.2
4.8
Primary current, detection threshold IP Th A4.02 × IP N 4.1 × IP N 4.17 × IP N
Overcurrent detection response time tr Th µs 1.4 2.2
Overcurrent detection
measured over temperature
−40 °C … 105 °C with a IP
step of 5 × IP N and di/dt =
50 A/µs
Overcurrent detection hold time thold Th ms 1
Reaction time @ 10 % of IP N tra µs 0.3 RL = 1 kΩ, di/dt = 50 A/µs
Step response time to 90 % of IP N trµs 0.4 RL = 1 kΩ, di/dtt = 50 A/µs
Frequency bandwidth (±3 dB) BW kHz 300 RL = 1 kΩ
Overall accuracy XG% of IP N 0.7
Overall accuracy @ TA = 85 °C (105 °C) XG% of IP N 0.7 (0.8)
Accuracy X% of IP N 0.5
Accuracy @ TA = 85 °C (105 °C) X% of IP N 0.65 (0.75)
_EM® \\\ II/ ’/I\\‘
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LPSR series
Figure 1: Linearity error Figure 2: Frequency response
Typical performance characteristics LPSR 6-NP
Figure 3: Step response
Figure 4: Output noise voltage spectral density Figure 5: dv/dt
−6 6
−0.1
−0.05
0
0.05
0.1
I
P
[A]
Linearity Error [ % I
P N
]
101102103104105106
−10
−8
−6
−4
−2
0
2
4
Frequency [Hz]
Relative Sensitivity [dB]
−50
−40
−30
−20
−10
0
10
20
Phase [°]
Rel. Sensitivity
Phase
100 200 300 400 500
0
2
4
6
t (µs)
IP (A)
0
0.208
0.417
0.625
Vout−Vref (V)
IP
Vout−Vref
101102103104105106
1
10
100
1000
10000
f
(Hz)
eno (µVRMS/ Hz
)
0123456 7 8
0
200
400
600
t (µs)
Primary Voltage VP (V)
20 kV/µs
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
Vout (V)
VP
Vout
Vref
3w" LEM“ 7m“
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LPSR series
Figure 6: Linearity error Figure 7: Frequency response
Typical performance characteristics LPSR 15-NP
Figure 8: Step response
Figure 9: Output noise voltage spectral density Figure 10: dv/dt
−15 15
−0.1
−0.05
0
0.05
0.1
I
P
[A]
Linearity Error [ % I
P N
]
101102103104105106
−10
−8
−6
−4
−2
0
2
4
Frequency [Hz]
Relative Sensitivity [dB]
−50
−40
−30
−20
−10
0
10
20
Phase [°]
Rel. Sensitivity
Phase
100 200 300 400 500
0
5
10
15
t (µs)
IP (A)
0
0.208
0.417
0.625
Vout−Vref (V)
IP
Vout−Vref
0123456 7 8
0
200
400
600
t (µs)
Primary Voltage VP (V)
20 kV/µs
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
Vout (V)
VP
Vout
Vref
101102103104105106
1
10
100
1000
10000
f
c
(Hz)
eno (µVRMS/ Hz
1/2
)
W" LEM“ 7/, ‘5
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LPSR series
Figure 11: Linearity error Figure 12: Frequency response
Typical performance characteristics LPSR 25-NP
Figure 13: Step response
Figure 14: Output noise voltage spectral density Figure 15: dv/dt
−25 25
−0.1
−0.05
0
0.05
0.1
I
P
[A]
Linearity Error [ % I
P N
]
101102103104105106
−10
−8
−6
−4
−2
0
2
4
Frequency [Hz]
Relative Sensitivity [dB]
−50
−40
−30
−20
−10
0
10
20
Phase [°]
Rel. Sensitivity
Phase
100 200 300 400 500 600
0
5
10
15
20
25
30
t (µs)
IP (A)
0
0.125
0.250
0.375
0.500
0.625
0.750
Vout−Vref (V)
IP
Vout−Vref
0123456 7 8
0
200
400
600
t (µs)
Primary Voltage VP (V)
20 kV/µs
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
Vout (V)
VP
Vout
Vref
101102103104105106
1
10
100
1000
10000
f
c
(Hz)
eno (µVRMS/ Hz
1/2
)
10 Frequency [Hz] m m ENI
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LPSR series
Figure 16: Linearity error Figure 17: Frequency response
Typical performance characteristics LPSR 50-NP
Figure 18: Step response
Figure 19: Output noise voltage spectral density Figure 20: dv/dt
101102103104105106
−10
−8
−6
−4
−2
0
2
4
Frequency [Hz]
Relative Sensitivity [dB]
−50
−40
−30
−20
−10
0
10
20
Phase [°]
Rel. Sensitivity
Phase
−50 50
−0.1
−0.05
0
0.05
0.1
I
P
[A]
Linearity Error [ % I
P N
]
100 200 300 400 500 600
0
10
20
30
40
50
60
t (µs)
IP (A)
0
0.125
0.250
0.375
0.500
0.625
0.750
Vout−Vref (V)
IP
Vout−Vref
10110210310410510610
7
1
10
100
1000
10000
f
c
(Hz)
eno (µVRMS/ Hz
1/2
)
0123456 7 8
0
200
400
600
t (µs)
Primary Voltage VP (V)
20 kV/µs
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
Vout (V)
VP
Vout
Vref
3w" LEM“ 7m“
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LPSR series
Maximum continuous DC primary current
The maximum continuous DC primary current plot shows the boundary of the area for which all the following conditions are true:
-IP < IP M
- Junction temperature TJ < 125 °C
- Primary conductor temperature < 110 °C
- Max power dissipation of internal resistors < 0.5 × resistors nominal power
Frequency derating
0 20 40 60 80 100 120 140
0
5
10
15
20
25
30
35
40
IP (A)
TA (°C)
0 20 40 60 80 100 120 140
0
10
20
30
40
50
60
70
80
90
100
IP (A)
TA (°C)
0 20 40 60 80 100 120 140
0
10
20
30
40
50
60
70
80
90
100
IP (A)
TA (°C)
0 20 40 60 80 100 120 140
0
20
40
60
80
100
120
140
160
IP (A)
TA (°C)
Figure 21: IP vs TA for LPSR 6-NP Figure 22: IP vs TA for LPSR 15-NP
Figure 23: IP vs TA for LPSR 25-NP
Figure 25: Maximum RMS AC primary current / maximum DC primary current vs frequency
Figure 24: IP vs TA for LPSR 50-NP
10 100 1k 10k 100k 1M
0
0.33
0.66
1
1.33
fc (Hz)
max AC rms current / max DC rms current
Ip
AC derating
V (t1)-V
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LPSR series
Magnetic offset
The magnetic offset current IO M is the consequence of a current
on the primary side (“memory effect” of the transducer’s ferro-
magnetic parts). It is measured using the following primary
current cycle. IO M depends on the current value IP1 (IP1 > IP M).
Figure 26: Current cycle used to measure magnetic and
electrical offset (transducer supplied)
(DC)
0 A
t
1
t
t Ip(3)
t
2
Ip(
3)
IP
IP N
−IP1
Ampere-turns and amperes
The transducer is sensitive to the primary current linkage ΘP
(also called ampere-turns).
ΘP = NP⋅IP (At)
Where NP 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 (NP = 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.
Transducer simplified model
The static model of the transducer at temperature TA is:
Vout = G⋅ΘP + ε
In which ε =
VO E + VO T (TA) + εG ⋅ΘP⋅G + εL (ΘP max)⋅ΘP max⋅G + TCG⋅(TA−25)⋅ΘP⋅G
With: ΘP = NP⋅IP : primary current linkage (At)
ΘP max : max primary current linkage applied to
the transducer
IS : secondary current (A)
TA : ambient operating temperature (°C)
IO E : electrical offset current (A)
IO T (TA) : temperature variation of IO at
temperature TA (°C)
G : sensitivity of the transducer (V/At)
TCG : temperature coefficient of G
εG : sensitivity error
εL(ΘP max) : linearity error for ΘP max
This model is valid for primary ampere-turns ΘP between
−ΘP max and +ΘP max only.
Sensitivity and linearity
To measure sensitivity and linearity, the primary current (DC) is
cycled from 0 to IP
, then to −IP and back to 0 (equally spaced
IP/10 steps). The sensitivity G is defined as the slope of the
linear regression line for a cycle between ±IP N.
The linearity error εL is the maximum positive or negative
difference between the measured points and the linear
regression line, expressed in % of IP N.
Performance parameters definition
G
th
t
2
V
out
t
1
V
out
I
O M
1
·
2
)()
(
−
=
V “1w “7 90 °/o
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LPSR series
Overall accuracy
The overall accuracy at 25 °C XG is the error in the −IP N … +IP N
range, relative to the rated value IP N.
It includes:
● the electrical offset VO E
●the sensitivity error εG
●the linearity error εL (to IP N)
Response and reaction times
The response time tr and the reaction time tra are shown in figure
28.
Both depend on the primary current di/dt. They are measured at
nominal ampere-turns.
Figure 28: Response time tr and reaction time tra
Electrical offset
The electrical offset voltage VO 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 26.
Using the current cycle shown in figure 26, the electrical offset
is:
The temperature variation VO T of the electrical offset voltage
VO E is the variation of the electrical offset from 25 °C to the
considered temperature:
Note: the transducer has to be demagnetized prior to
the application of the current cycle (for example with a
demagnetization tunnel).
Figure 27: Test connection
Performance parameters definition
t
ra
V
t
r
90 %
10 %
t
100 %
I
I
out
p
2
V
out
(
t
1
) +
V
out
(
t
2
)
VO E
=
V
O T
(
T
) =
VO E
(
T
)
− VO E
(25° C)
2
V
out
(
t
1
) +
V
out
(
t
2
)
VO E
=
V
O T
(
T
) =
VO E
(
T
)
− VO E
(25° C)
+U
C
V
out
R
M
V
ref
R
L
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LPSR series
Application information
Filtering and decoupling
Supply voltage UC
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 Vout and reference Vref due to high varying
primary current. The transducer power supply rejection ratio is
low at high frequency.
Output Vout
The output Vout has a very low output impedance of typically
1 Ohm; it can drive capacitive loads of up to 100 nF directly.
Adding series resistance Rf of several tenths of Ohms allows
much larger capacitive loads Cf (higher than 1 µF). Empirical
evaluation may be necessary to obtain optimum results. The
minimum load resistance on Vout is 1 kOhm.
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.
Reference Vref
Likewise output Vout, the Vref has a very low output impedance
of typically 1 Ohm; it can drive capacitive loads of up to 100 nF
directly. Adding series resistance Rf of several tenths of Ohms
allows much larger capacitive loads Cf (higher than 1 µF).
Empirical evaluation may be necessary to obtain optimum results.
The minimum load resistance on Vref is 10 kOhms.
Figure 29: filtered Vout connection
Number
of primary
turns
Primary
Nominal
RMS
current
Output
voltage
Vout
Primary
resistance
RP [mΩ]
Recommended
connections
1±IP N Vref ±0.625 0.18
9 8 7 6 OUT
IN 2 3 4 5
2±IP N/2 Vref ±0.625 0.72
9 8 7 6 OUT
IN 2 3 4 5
3±IP N/3 Vref ±0.625 1.8
9 8 7 6 OUT
IN 2 3 4 5
4±IP N/4 Vref ±0.625 2.88
9 8 7 6 OUT
IN 2 3 4 5
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LPSR 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 Vref 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 maximun 1.5 mA.
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
Vref.
Figure 30: Measuring range versus external Vref LPSR 6 A Figure 31: Measuring range versus external Vref LPSR 15 A
Upper limit: IP = −9.6 * Vref + 45.6 (Vref = 0.5 … 2.75 V) Upper limit: IP = −24 * Vref + 114 (Vref = 0.5 … 2.75 V)
Lower limit: IP = −9.6 * Vref + 2.4 (Vref = 0.5 … 2.75 V) Lower limit: IP = −24 * Vref + 6 (Vref = 0 … 2.75 V)
0.5 1 1.5 2 2.5 3
−50
−40
−30
−20
−10
0
10
20
30
40
50
I
P M
(A)
Vref (V)
2.75 V
¦
0.5 1 1.5 2 2.5 3
−120
−100
−80
−60
−40
−20
0
20
40
60
80
100
120
IP M
(A)
Vref (V)
2.75 V
¦
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LPSR series
External reference voltage
Figure 32: Measuring range versus external Vref LPSR 25 A Figure 33: Measuring range versus external Vref LPSR 50 A
Upper limit: IP = −40 * Vref + 190 (Vref = 1.85 … 2.75 V)
Upper limit: IP = 113 (Vref = 0 …1.85 V) Upper limit: IP = 150 (Vref = 0 … 2.75 V)
Lower limit: IP = −40 * Vref + 10 (Vref = 0 … 2.75 V) Lower limit: IP = −80 * Vref + 20 (Vref = 0 … 2.125 V)
Lower limit: IP = −150 (Vref = 2.125 … 2.75 V)
Example with Vref = 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
● The 50 A version has a measuring range from −112 A to +150 A
Example with Vref= 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
● The 50 A version has a measuring range from −20 A to +150 A
Overcurrent detection definition
The overcurrent detection function generates an output signal to the OCD pin whenever the primary current exceeds a
pre-programmed threshold value. Once the overcurrent event is detected, the CMOS-type OCD signal changes from low logic
(< 30 % UC) to high logic value(> 70 % UC). In order to avoid undesirable glitches, the OCD signal is digitally filtered and the OCD
signal output is held for 1 ms in high logic value after the last overcurrent event detection.
Parameter Symbol Unit Min Typ Max Comment
High-level output voltage Vout H V3.5 With UC = +5 V and source
current of 3 mA
Low-level output voltage Vout L V1.5 With UC = +5 V and sink
current of 3 mA
0.5 1 1.5 2 2.5 3
−130
−110
−90
−70
−50
−30
−10
10
30
50
70
90
110
130
IP M
(A)
Vref (V)
2.75 V
¦
0.5 1 1.5 2 2.5 3
−200
−150
−100
−50
0
50
100
150
200
IP M
(A)
Vref (V)
2.75 V
¦
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LPSR series
PCB footprint
Assembly on PCB
● Recommended PCB hole diameter 1.3 mm for primary pin
0.8 mm for secondary pin
● Maximum PCB thickness 2.4 mm
● Wave soldering profile maximum 260 °C for 10 s
No clean process only
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.
Remark
Installation of the transducer must be done unless otherwise specified on the datasheet, according to LEM Transducer Generic
Mounting Rules. Please refer to LEM document N°ANE120504 available on our Web site: Products/Product Documentation.
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.
+UC
Vout
RM
Vref
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LPSR series
Dimensions (in mm)
Connection
+UC
Vout
RM
Vref
+UC
Vout
RM
Vref
+UC
Vout
RM
Vref
A and B correspond to internal points used
for the creepage and clearance distance
calculation
Page 20/20
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LPSR series
Packaging information
Standard delivery in cardboard: L × W × H: 315 × 200 × 120 mm
Each carboard contains 200 parts, placed into 4 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.
50 transducers per tray