LEM电流电压传感器说明书

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).

I PN = 25 At

Electrical data

I PN I P

V OUT V REF N

S R LC LR IM

TCR IMV C I C

Primary nominal r.m.s. currentPrimary current, measuring rangeAnalog output voltage @I P

I P = 0

Voltage reference (internal reference), refout mode

Voltage reference (external reference), refin mode

Number of secondary turns (± 0.1 %)Load resistance

Max. capacitive loading

Internal measuring resistance (± 0.5 %)Thermal drift of R IM

Supply voltage (± 5 %)

Current consumption @ V C = 5 VTyp

25At

1)

0 .. ± 80 At 2.5 ± (0.625·I P /I PN ) V 2.5 2) V 2.5 3)

V

4)

1.9 .. 2.7

V

2000≥ 2k Ω500pF 50Ω

Features

•Closed loop (compensated) multi-•••••••

range current transducer using theHall effect

Unipolar voltage supply

Insulated plastic case recognizedaccording to UL 94-V0

Compact design for PCB mountingIncorporated measuring resistanceExtended measuring rangeAccess to the internal voltagereference

Possibility to feed the transducerreference from external supply.

Accuracy - Dynamic performance data

X

Advantages

± 0.2± 0.7

Max

%%%

ε

L

Accuracy @ I PN , T A = 25°C

Accuracy with R IM @ I PN , T A = 25°CLinearity error

TCV OUT Thermal drift of V OUT / VREF @ IP = 0TC εG V OM

- 40°C .. + 85°C37.5 ppm/K

Thermal drift of the gain- 40°C .. + 85°C50 6) ppm/KResidual voltage @ IP = 0, a fter an overload of3 x I PN ± 0.5mV

5 x I PN ± 2.0mV 10 x I PN ± 2.0mV

Thermal drift of internal VREF @ IP = 0 - 10°C .. + 85°C 50ppm/K

- 40°C .. - 10°C 100ppm/K

Reaction time @ 10 % of I PN 60A/µsFrequency bandwidth(0 .. - 0.5 dB)DC .. 100kHz

(- 0.5 .. 1 dB)DC .. 200kHz Ambient operating temperature

Ambient storage temperatureMass

Standards

- 40 .. + 85- 40 .. + 10010

EN 50178 : 1997I EC 60950-1 : 2001

•••••••

Excellent accuracyVery good linearity

Very low temperature driftOptimized response timeWide frequency bandwidthNo insertion losses

High immunity to externalinterference

•Current overload capability.

TCV REF t ra t r

di/dtf

Applications

•AC variable speed drives and servo•••••

motor drives

Static converters for DC motor drivesBattery supplied applications

Uninterruptible Power Supplies (UPS)Switched Mode Power Supplies (SMPS)Power supplies for weldingapplications.

General data

T A T S m

°C°Cg

Application Domain

•Industrial.

Copyright protected.

see overleaf.

051123/6

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

Page 1/3

LEM www.lem.com

Current Transducer LTSR 25-NP

Isolation characteristics

V d w V e dCp dCl CTI

R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mnImpulse withstand voltage 1.2/50 µs

R.m.s. voltage for partial discharge extinction @ 10pCCreepage distance 7) Clearance distance 8)

Comparative Tracking Index (Group III a)

3

> 8Min > 1.5Min 15.356.2175

kV kV kV m m m m

Application examples

According to EN 50178 and IEC 61010-1 standards and following conditions :

•Over voltage category OV 3•Pollution degree PD2Notes

Only in refout mode or with external REF less than 2.525 Vand greater than 2.475 V. For external REF out of theselimits see leaflet.2)

V OUT is linked to V REF , by conception the difference

between these two nodes for I P = 0 is maximum ± 25 mV,2.475 V

In Refout mode at T A = 25°C, 2.475 V

The minimal impedance loading the ref pin should be> 220 kΩ.Internal impedance = 600 Ω. For most applications you needto buffer this output to feed it into an ADC for example.4)

To overdrive the REF (1.9 V .. 2.7 V) max. ± 1 mA is needed.5)

Please see the operation principle on the other side. 6)

Only due to TCR IM. 7) On housing.8)

On PCB with soldering pattern UTEC93-703.

1)

Safety

This transducer must be used in electric/electronic equipment with respect to applicablestandards and safety requirements in accordance with the following manufacturer's operatinginstructions.

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 afterinstallation.

A protective housing or additional shield could be used.Main supply must be able to be disconnected.

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

051123/6

Page 2/3

LEM www.lem.com

Dimensions LTSR 25-NP (in mm. 1 mm = 0.0394 inch)

Mechanical characteristics

•General tolerance

•Fastening & connection of primaryRecommended PCB hole

•Fastening & connection of secondaryRecommended PCB hole

•Additional primary through-hole

± 0.2 mm

6 pins 0.8 x 0.8 mm1.3 mm

4 pins 0.5 x 0.35 mm0.8 mm∅ 3.2 mm

Output Voltage - Primary Current

V [ V ]

- I Pmax - I PN 0 I PN I Pmax

Remarks

•V OUT is positive when I P flows from terminals 1, 2, 3 to terminals6, 5, 4

•For the EMC, the acceptance criteria are available on request.•Temperature of the primary jumper should not exceed 100 [°C].

P [ At ]

9) Output voltage when LTSR 25-NP is used with internal

reference.

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

051123/6

Page 3/3

LEM www.lem.com