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Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 18
Technical content
Features
- Closed loop (compensated) multi-range current transducer
- Voltage output
- Single supply
- Isolated plastic case material recognized according to UL 94-V0
- Compact design for PCB mounting. Advantages
- Very low temperature coefficient of offset
- Very good dv/dt immunity
- LTSR compatible footprint
- Reduced height
- 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
- EN 50178
- UL 508
- IEC 61010-1 (safety). Application Domain
- Industrial.
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series Absolute maximum ratings Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. Isolation characteristics Parameter Symbol Unit Value Comment RMS voltage for AC isolation test 50/60Hz/1 min Vd kV 4.1 Impulse withstand voltage 1.2/50 µs Vw kV 7.5 Partial discharge extinction voltage @ 10 pC (rms) Ve V 1000 Clearance distance (pri. - sec.) dCI mm 7.5 Shortest distance through air Creepage distance (pri. - sec.) dCp mm 7.5 Shortest path along device body Creepage distance (pri. .- sec.) dCp mm 6.2 When mounted on PCB with recommended layout Case material - - V0 according to UL 94 Comparative tracking index CTI V 600 Application example - - 300 V CAT III PD2 Reinforced isolation, non uniform field according to EN 50178, EN 61010 Application example - - 600 V CAT III PD2 Simple isolation, non uniform field according to EN 50178, EN 61010 According to UL 508: primary potential involved in Volts RMS AC or DC - V 600 For use in a pollution degree 2 environment Environmental and mechanical characteristics Parameter Symbol Unit Min Typ Max Comment Ambient operating temperature TA °C -40 85 Ambient storage temperature TS °C -55 105 Mass m g 9 Standards EN 50178, IEC 60950-1, IEC 61010-1, IEC 61326-1, UL 508 Parameter Symbol Unit Value Supply voltage VC V 7 Primary conductor temperature °C 110 Maximum primary current IP max A 20 x IPN ESD rating, Human Body Model (HBM) kV 4
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series Electrical data CASR 6-NP At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, internal reference, unless otherwise noted. Parameter Symbol Unit Min Typ Max Comment Primary nominal current rms IPN A 6 Primary current, measuring range IPM A -20 20 Number of primary turns NP - 1,2,3 Supply voltage VC V 4.75 5 5.25 Current consumption IC mA 15 + 20 + NS = 1731 turns Reference voltage @ IP = 0 A VREF V 2.495 2.5 2.505 Internal reference External reference voltage VREF V 0 4 Output voltage VOUT V 0.375 4.625 Output voltage @ IP = 0 A VOUT V VREF Electrical offset voltage VOE mV -5.3 5.3 100% tested VOUT - VREF Electrical offset current referred to primary IOE mA -51 51 100% tested Temperature coefficient of VREF TCVREF ppm/K ±5 ±50 Internal reference Temperature coefficient of VOUT @ IP = 0 A TCVOUT ppm/K ±6 ±14 ppm/K of 2.5 V - 40°C .. 85°C Theoretical sensitivity Gth mV/A 104.2 625 mV/ IPN Sensitivity error εG % -0.7 0.7 100% tested Temperature coefficient of G TCG ppm/K ±40 - 40°C .. 85°C Linearity error εL % of IPN -0.1 0.1 Magnetic offset current (10 x IPN) referred to primary IOM A -0.1 0.1 Output current noise (spectral density) rms 100 Hz .. 100 kHz referred to primary ino µA/Hz½ 20 RL = 1 kΩ Peak-peak output ripple at oscillator frequency f = 450 kHz (typ.) - mV 40 160 RL = 1 kΩ Reaction time @ 10 % of IPN tra µs 0.3 RL = 1 kΩ di/dt = 18 A/µs Response time @ 90 % of IPN tr µs 0.3 RL = 1 kΩ di/dt = 18 A/µs Frequency bandwidth (± 1 dB) BW kHz 200 RL = 1 kΩ Frequency bandwidth (± 3 dB) BW kHz 300 RL = 1 kΩ Overall accuracy XG % of IPN 1.7 Overall accuracy @ TA = 85°C XG % of IPN 2.2 Accuracy X % of IPN 0.8 Accuracy @ TA = 85°C X % of IPN 1.4 IP (mA) NS IP (mA) NS
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series Electrical data CASR 15-NP At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, internal reference, unless otherwise noted. Parameter Symbol Unit Min Typ Max Comment Primary nominal current rms IPN A 15 Primary current, measuring range IPM A -51 51 Number of primary turns NP - 1,2,3 Supply voltage VC V 4.75 5 5.25 Current consumption IC mA 15 + 20 + NS = 1731 turns Reference voltage @ IP = 0 A VREF V 2.495 2.5 2.505 Internal reference External reference voltage VREF V 0 4 Output voltage VOUT V 0.375 4.625 Output voltage @ IP = 0 A VOUT V VREF Electrical offset voltage VOE mV -2.21 2.21 100% tested VOUT - VREF Electrical offset current referred to primary IOE mA -53 53 100% tested Temperature coefficient of VREF TCVREF ppm/K ±5 ±50 Internal reference Temperature coefficient of VOUT @ IP = 0 A TCVOUT ppm/K ±2.3 ±6 ppm/K of 2.5 V - 40°C .. 85°C Theoretical sensitivity Gth mV/A 41.67 625 mV/ IPN Sensitivity error εG % -0.7 0.7 100% tested Temperature coefficient of G TCG ppm/K ±40 - 40°C .. 85°C Linearity error εL % of IPN -0.1 0.1 Magnetic offset current (10 x IPN) referred to primary IOM A -0.1 0.1 Output current noise (spectral density) rms 100 Hz .. 100 kHz referred to primary ino µA/Hz½ 20 RL = 1 kΩ Peak-peak output ripple at oscillator frequency f = 450 kHz (typ.) - mV 15 60 RL = 1 kΩ Reaction time @ 10 % of IPN tra µs 0.3 RL = 1 kΩ di/dt = 44 A/µs Response time @ 90 % of IPN tr µs 0.3 RL = 1 kΩ di/dt = 44 A/µs Frequency bandwidth (± 1 dB) BW kHz 200 RL = 1 kΩ Frequency bandwidth (± 3 dB) BW kHz 300 RL = 1 kΩ Overall accuracy XG % of IPN 1.2 Overall accuracy @ TA = 85°C XG % of IPN 1.5 Accuracy X % of IPN 0.8 Accuracy @ TA = 85°C X % of IPN 1.2 IP (mA) NS IP (mA) NS
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series Electrical data CASR 25-NP At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, internal reference, unless otherwise noted. Parameter Symbol Unit Min Typ Max Comment Primary nominal current rms IPN A 25 Primary current, measuring range IPM A -85 85 Number of primary turns NP - 1,2,3 Supply voltage VC V 4.75 5 5.25 Current consumption IC mA 15 + 20 + NS = 1731 turns Reference voltage @ IP = 0 A VREF V 2.495 2.5 2.505 Internal reference External reference voltage VREF V 0 4 Output voltage VOUT V 0.375 4.625 Output voltage @ IP = 0 A VOUT V VREF Electrical offset voltage VOE mV -1.35 1.35 100% tested VOUT - VREF Electrical offset current referred to primary IOE mA -54 54 100% tested Temperature coefficient of VREF TCVREF ppm/K ±5 ±50 Internal reference Temperature coefficient of VOUT @ IP = 0 A TCVOUT ppm/K ±1.4 ±4 ppm/K of 2.5 V - 40°C .. 85°C Theoretical sensitivity Gth mV/A 25 625 mV/ IPN Sensitivity error εG % -0.7 0.7 100% tested Temperature coefficient of G TCG ppm/K ±40 - 40°C .. 85°C Linearity error εL % of IPN -0.1 0.1 Magnetic offset current (10 x IPN) referred to primary IOM A -0.1 0.1 Output current noise (spectral density) rms 100 Hz .. 100 kHz referred to primary ino µA/Hz½ 20 RL = 1 kΩ Peak-peak output ripple at oscillator frequency f = 450 kHz (typ.) - mV 10 40 RL = 1 kΩ Reaction time @ 10 % of IPN tra µs 0.3 RL = 1 kΩ di/dt = 68 A/µs Response time @ 90 % of IPN tr µs 0.3 RL = 1 kΩ di/dt = 68 A/µs Frequency bandwidth (± 1 dB) BW kHz 200 RL = 1 kΩ Frequency bandwidth (± 3 dB) BW kHz 300 RL = 1 kΩ Overall accuracy XG % of IPN 1 Overall accuracy @ TA = 85°C XG % of IPN 1.35 Accuracy X % of IPN 0.8 Accuracy @ TA = 85°C X % of IPN 1.15 IP (mA) NS IP (mA) NS
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series Electrical data CASR 50-NP At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, internal reference, unless otherwise noted. Parameter Symbol Unit Min Typ Max Comment Primary nominal current rms IPN A 50 Primary current, measuring range IPM A -150 150 Number of primary turns NP - 1,2,3 Supply voltage VC V 4.75 5 5.25 Current consumption IC mA 15 + 20 + NS = 966 turns Reference voltage @ IP = 0 A VREF V 2.495 2.5 2.505 Internal reference External reference voltage VREF V 0 4 Output voltage VOUT V 0.375 4.625 Output voltage @ IP = 0 A VOUT V VREF Electrical offset voltage VOE mV -0.725 0.725 100% tested VOUT - VREF Electrical offset current referred to primary IOE mA -58 58 100% tested Temperature coefficient of VREF TCVREF ppm/K ±5 ±50 Internal reference Temperature coefficient of VOUT @ IP = 0 A TCVOUT ppm/K ±0.7 ±3 ppm/K of 2.5 V - 40°C .. 85°C Theoretical sensitivity Gth mV/A 12.5 625 mV/ IPN Sensitivity error εG % -0.7 0.7 100% tested Temperature coefficient of G TCG ppm/K ±40 - 40°C .. 85°C Linearity error εL % of IPN -0.1 0.1 Magnetic offset current (10 x IPN) referred to primary IOM A -0.1 0.1 Output current noise (spectral density) rms 100 Hz .. 100 kHz referred to primary ino µA/Hz½ 20 RL = 1 kΩ Peak-peak output ripple at oscillator frequency f = 450 kHz (Typ.) - mV 5 20 RL = 1 kΩ Reaction time @ 10 % of IPN tra µs 0.3 RL = 1 kΩ di/dt = 100 A/µs Response time @ 90 % of IPN tr µs 0.3 RL = 1 kΩ di/dt = 100 A/µs Frequency bandwidth (± 1 dB) BW kHz 200 RL = 1 kΩ Frequency bandwidth (± 3 dB) BW kHz 300 RL = 1 kΩ Overall accuracy XG % of IPN 0.9 Overall accuracy @ TA = 85°C XG % of IPN 1.2 Accuracy X % of IPN 0.8 Accuracy @ TA = 85°C X % of IPN 1.1 IP (mA) NS IP (mA) NS
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series Ampere-turns and amperes The transducer is sensitive to the primary current linkage QP (also called ampere-turns). Q P=NPIP(At) Where NPIP the number of primary turn (1, 2 or 3 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 (A-t) 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 QP + error In which error = VOE + VOT (TA) + εG ·QP·G + εL(QPmax)·QPmax·G + TCG·(TA-25)·QP·G With: QP = NPIP :the input ampere-turns (At) Please read above warning. QPmax :the maxi input ampere-turns that have been applied to the transducer (At) VOUT :the secondary voltage (V) TA :the ambient temperature (°C) VOE :the electrical offset voltage (V) VOT(TA) :the temperature variation of VO at temperature TA (V) G :the sensitivity of the transducer (V/At) εG :the sensitivity error εL (QPmax) :the linearity error for QPmax This model is valid for primary ampere-turns QP between -QPmax and +QPmax only. Performance parameters definition 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 regres- sion line for a cycle between ± IPN. The linearity error εL is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of IPN. Magnetic offset The magnetic offset current IOM is the consequence of a cur- rent on the primary side (“memory effect” of the transducer’s ferro-magnetic parts). It is included in the linearity figure but can be measured individually. It is measured using the following primary current cycle. IOM depends on the current value IP1. Figure 30: Current cycle used to measure magnetic and electrical offset (transducer supplied) IP (DC) -IP1 IP1
0 A t1 t
t Ip(3) Ip( Gth tVtVI OUTOUT OM )()( 21 ⋅−=
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series 1 2 3 10 9 8 Filtering and decoupling Supply voltage VC The fluxgate oscillator draws current pulses of up to 30 mA at a rate of ca. 900 kHz. Significant 900 kHz voltage ripple on VC can indicate a power supply with high impedance. At these frequencies the power supply rejection ratio is low, and the ripple may appear on the transducer output VOUT and reference VREF. The transducer has internal decoupling capacitors, but in the case of a power supply with high impedance, it is advised to provide local decoupling (100 nF or more, located close to the transducer) Output VOUT The output VOUT has a very low output impedance of typically 2 Ohms; it can drive 100 pF directly. Adding series Rf = 100 Ohms allows much larger capacitive loads. 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 m Ω per conductor. In the following table, examples of primary resistance according to the number of primary turns. Reference VREF Ripple present on the reference output can be filtered with a low value of capacitance because of the internal 680 Ohm series resistance. The maximum filter capacitance value is 1 µF.Application information
Application information
RP [mW] Recommended connections 1 0.24 10 9 8 OUT IN 1 2 3 2 1.08 10 9 8 OUT IN 1 2 3 3 2.16 10 9 8 OUT IN 1 2 3
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series External reference voltage If the Ref pin of the transducer is not used it could be either left unconnected or filtered according to the previous paragraph “Reference VREF”. The Ref pin has two modes Ref IN and Ref OUT:
- In the Ref OUT mode the 2.5 V internal precision reference is used by the transducer as the reference point for bipolar measurements; this internal reference is connected to the Ref pin of the transducer through a 680 Ohms resistor. it tolerates sink or source currents up to ± 5 mA, but the 680 Ohms resistor prevents this current to exceed these limits.
- In the Ref IN mode, an external reference voltage is connected to the Ref pin; this voltage is specified in the range 0 to 4 V and is directly used by the transducer as the reference point for measurements. The external reference voltage Vref must be able: - either to source a typical current of 680 5.2−Vref , the maximum value will be 2.2 mA typ. when Vref = 4 V. - or to sink a typical current of 680
5.2 Vref−
, the maximum value will be 3.68 mA typ. when Vref = 0 V. The following graphs show how the measuring range of each transducer version depends on the external reference voltage value Vref. Upper limit : IP = 80 (Vref = 0 .. 1.29 V) Lower limit : IP = -80 (Vref = 3.7 .. 4 V) Application information (continued) -50 -40 -30 -20 -10 0 1 2 3 4 VREF (V) I P (A) CASR 6 -100 -80 -60 -40 -20 100 0 1 2 3 4 I P (A) VREF (V) CASR 15
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series External reference voltage (continued) Example with VREF = 1.65 V:
- The 6 A version has a measuring range from - 12.24 A to + 28.5 A
- The 15 A version has a measuring range from - 30.6 A to + 71.4 A
- The 25 A version has a measuring range from - 51 A to + 85 A
- The 50 A version has a measuring range from - 102 A to + 150 A Example with VREF = 0 V:
- The 6 A version has a measuring range from + 3.6 A to + 44.4 A
- The 15 A version has a measuring range from + 9 A to + 80 A
- The 25 A version has a measuring range from + 15 A to + 85 A
- The 50 A version has a measuring range from + 30 A to + 150 A -100 -80 -60 -40 -20 100 0 1 2 3 4 VREF (V) I P (A) CASR 25 -200 -150 -100 -50 100 150 200 0 1 2 3 4 VREF (V) I P (A) CASR 50
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series CASR 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 (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.
8March2012/version 7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CASR series Dimensions CASR Series (in mm. General linear tolerance ± 0.25 mm) Connection