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page 1/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com current transducer cas series i pn = 6, 15, 25, 50 a ref: cas 6-np, cas 15-np, cas 25-np, cas 50-np for the electronic measurement of current: dc, ac, pulsed..., with galvanic isolation between the primary and the secondary circuit. 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 coeffcient of offset very good dv/dt immunity lts compatible footprint reduced height. 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. standards en 50178 ul 508 iec 61010-1 (safety). application domain industrial.
page 2/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas 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 v d kv 4.2 impulse withstand voltage 1.2/50 s v w kv 7.6 partial discharge extinction voltage @ 10 pc (rms) v e v 1000 clearance distance (pri. - sec.) dci mm 7.7 shortest distance through air creepage distance (pri. - sec.) dcp mm 7.7 shortest path along device body creepage distance (pri. .- sec.) - mm 6.3 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 feld according to en 50178, en 61010 application example - - 600 v cat iii pd2 simple isolation, non uniform feld 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 t a c -40 85 ambient storage temperature t s 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 v c v 7 primary conductor temperature c 110 maximum primary current i p max a 20 x i pn esd rating, human body model (hbm) kv 4
page 3/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series electrical data cas 6-np at t a = 25c, v c = + 5 v, n p = 1 turn, r l = 10 k ? , unless otherwise noted. parameter symbol unit min typ max comment primary nominal current rms i pn a 6 primary current, measuring range i pm a -20 20 number of primary turns n p - 1,2,3 supply voltage v c v 4.75 5 5.25 current consumption i c ma 15 + 20 + n s = 1731 turns output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v 2.5 electrical offset voltage v oe mv -10.4 10.4 100% tested v out - 2.5 v electrical offset current referred to primary i oe a -0.1 0.1 100% tested temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 10 80 ppm/k of 2.5 v - 40c .. 85c theoretical sensitivity gth mv/a 104.2 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 - 40c .. 85c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 x i pn ) referred to primary i om a -0.1 0.1 output current noise (spectral density) rms 100 .. 100 khz referred to primary i no a/hz ? 36 r l = 1 k ? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 40 160 r l = 1 k ? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k ? di/dt = 18 a/s response time @ 90 % of i pn t r s 0.3 r l = 1 k ? di/dt = 18 a/s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k ? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k ? overall accuracy x g % of i pn 2.5 overall accuracy @ t a = 85c x g % of i pn 4.6 accuracy x % of i pn 0.8 accuracy @ t a = 85c x % of i pn 3.0 i p (ma) n s i p (ma) n s
page 4/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series electrical data cas 15-np at t a = 25c, v c = + 5 v, n p = 1 turn, r l = 10 k ? , unless otherwise noted. parameter symbol unit min typ max comment primary nominal current rms i pn a 15 primary current, measuring range i pm a -51 51 number of primary turns n p - 1,2,3 supply voltage v c v 4.75 5 5.25 current consumption i c ma 15 + 20 + n s = 1731 turns output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v 2.5 electrical offset voltage v oe mv -7.1 7.1 100% tested v out - 2.5 v electrical offset current referred to primary i oe a -0.17 0.17 100% tested temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 7.5 70 ppm/k of 2.5 v - 40c .. 85c theoretical sensitivity gth mv/a 41.67 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 - 40c .. 85c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 x i pn ) referred to primary i om a -0.1 0.1 output current noise (spectral density) rms 100 hz .. 100 khz referred to primary i no a/hz ? 90 r l = 1 k ? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 15 60 r l = 1 k ? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k ? di/dt = 44 a/s response time @ 90 % of i pn t r s 0.3 r l = 1 k ? di/dt = 44 a/s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k ? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k ? overall accuracy x g % of i pn 1.9 overall accuracy @ t a = 85c x g % of i pn 3.9 accuracy x % of i pn 0.8 accuracy @ t a = 85c x % of i pn 2.7 i p (ma) n s i p (ma) n s
page 5/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series electrical data cas 25-np at t a = 25c, v c = + 5 v, n p = 1 turn, r l = 10 k ? , unless otherwise noted. parameter symbol unit min typ max comment primary nominal current rms i pn a 25 primary current, measuring range i pm a -85 85 number of primary turns n p - 1,2,3 supply voltage v c v 4.75 5 5.25 current consumption i c ma 15 + 20 + n s = 1731 turns output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v 2.5 electrical offset voltage v oe mv -6.25 6.25 100% tested v out - 2.5 v electrical offset current referred to primary i oe a -0.25 0.25 100% tested temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 6.5 60 ppm/k of 2.5 v - 40c .. 85c theoretical sensitivity gth mv/a 25 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 - 40c .. 85c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 x i pn ) referred to primary i om a -0.1 0.1 output current noise (spectral density) rms 100 hz .. 100 khz referred to primary i no a/hz ? 150 r l = 1 k ? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 10 40 r l = 1 k ? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k ? di/dt = 68 a/s response time @ 90 % of i pn t r s 0.3 r l = 1 k ? di/dt = 68 a/s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k ? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k ? overall accuracy x g % of i pn 1.8 overall accuracy @ t a = 85c x g % of i pn 3.5 accuracy x % of i pn 0.8 accuracy @ t a = 85c x % of i pn 2.5 i p (ma) n s i p (ma) n s
page 6/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series electrical data cas 50-np at t a = 25c, v c = + 5 v, n p = 1 turn, r l = 10 k ? , unless otherwise noted. parameter symbol unit min typ max comment primary nominal current rms i pn a 50 primary current, measuring range i pm a -150 150 number of primary turns n p - 1,2,3 supply voltage v c v 4.75 5 5.25 current consumption i c ma 15 + 20 + n s = 966 turns output voltage v out v 0.375 4.625 output voltage @ i p = 0 a v out v 2.5 electrical offset voltage v oe mv -5.8 5.8 100% tested v out - 2.5 v electrical offset current referred to primary i oe a -0.46 0.46 100% tested temperature coeffcient of v out @ i p = 0 a tcv out ppm/k 6 60 ppm/k of 2.5 v - 40c .. 85c theoretical sensitivity gth mv/a 12.5 625 mv/ i pn sensitivity error g % -0.7 0.7 100% tested temperature coeffcient of g tcg ppm/k 40 - 40c .. 85c linearity error l % of i pn -0.1 0.1 magnetic offset current (10 x i pn ) referred to primary i om a -0.1 0.1 output current noise (spectral density) rms 100 hz .. 100 khz referred to primary i no a/hz ? 300 r l = 1 k ? peak-peak output ripple at oscillator frequency f = 450 khz (typ.) - mv 5 20 r l = 1 k ? reaction time @ 10 % of i pn t ra s 0.3 r l = 1 k ? di/dt = 100 a/s response time @ 90 % of i pn t r s 0.3 r l = 1 k ? di/dt = 100 a/s frequency bandwidth ( 1 db) bw khz 200 r l = 1 k ? frequency bandwidth ( 3 db) bw khz 300 r l = 1 k ? overall accuracy x g % of i pn 1.7 overall accuracy @ t a = 85c x g % of i pn 3.4 accuracy x % of i pn 0.8 accuracy @ t a = 85c x % of i pn 2.5 i p (ma) n s i p (ma) n s
page 7/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series typical performance characteristics cas 6-np figure 1: linearity error figure 2: frequency response figure 3: step response figure 4: step response figure 5: input referred noise figure 6: dv/dt -0.1 -0.05 0 0.05 0.1 -6 0 6 i p (a) linearity error (% of i pn ) -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 100 1000 10000 100000 1000000 frequency (hz) relative sensitivity (db) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 phase () relative sensitivity phase i p = 6 a -1 0 1 2 3 4 5 6 7 -0.5 0 0.5 1 1.5 2 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 6 a -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t (s) primary voltage v p (v) 2.4 2.6 2.8 3.0 3.2 3.4 3.6 v out (v) vp vou t 20 kv/s -1 0 1 2 3 4 5 6 7 -2 0 2 4 6 8 10 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 6 a 1 10 100 1000 10000 1 . e+1 1 . e+2 1 . e+3 1 . e+4 1 . e+5 1 . e+6 1 . e+7 frequency (hz) i no (a/hz ? )
page 8/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series typical performance characteristics cas 15-np figure 7: linearity error figure 8: frequency response figure 9: step response figure 10: step response figure 11: input referred noise figure 12: dv/dt -0.1 -0.05 0 0.05 0.1 -15 0 15 i p (a) linearity error (% of i pn ) -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 100 1000 10000 100000 1000000 frequency (hz) relative sensitivity (db) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 phase () relative sensitivity phase i p = 15 a -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t (s) primary voltage v p (v) 2.4 2.6 2.8 3.0 3.2 3.4 3.6 v out (v) vp vou t 20 kv/s -2.5 0 2.5 5 7.5 10 12.5 15 17.5 -0.5 0 0.5 1 1.5 2 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 15 a -2.5 0 2.5 5 7.5 10 12.5 15 17.5 -2 0 2 4 6 8 10 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 15 a 1 10 100 1000 10000 1 . e+1 1 . e+2 1 . e+3 1 . e+4 1 . e+5 1 . e+6 1 . e+7 frequency (hz) i no (a/hz ? )
page 9/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series typical performance characteristics cas 25-np figure 13: linearity error figure 14: frequency response figure 15: step response figure 16: step response figure 17: input referred noise figure 18: dv/dt -0.1 -0.05 0 0.05 0.1 -25 0 25 i p (a) linearity error (% of i pn ) -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 100 1000 10000 100000 1000000 frequency (hz) relative sensitivity (db) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 phase () relative sensitivity phase i p = 25 a -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t (s) primary voltage v p (v) 2.4 2.6 2.8 3.0 3.2 3.4 3.6 v out (v) vp vou t 20 kv/s -4.2 0.0 4.2 8.3 12.5 16.7 20.8 25.0 29.2 -0.5 0 0.5 1 1.5 2 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 25 a -4.2 0.0 4.2 8.3 12.5 16.7 20.8 25.0 29.2 -2 0 2 4 6 8 10 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 25 a 1 10 100 1000 10000 1 . e+1 1 . e+2 1 . e+3 1 . e+4 1 . e+5 1 . e+6 1 . e+7 frequency (hz) i no (a/hz ? )
page 10/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series typical performance characteristics cas 50-np figure 19: linearity error figure 20: frequency response figure 21: step response figure 22: step response figure 23: input referred noise figure 24: dv/dt -0.1 -0.05 0 0.05 0.1 -50 0 50 i p (a) linearity error (% of i pn ) -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 100 1000 10000 100000 1000000 frequency (hz) relative sensitivity (db) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 phase () relative sensitivity phase i p = 50 a -800 -600 -400 -200 0 200 400 600 800 -1 0 1 2 3 4 5 t (s) primary voltage v p (v) 2.4 2.6 2.8 3.0 3.2 3.4 3.6 v out (v) vp vou t 20 kv/s -8.3 0.0 8.3 16.7 25.0 33.3 41.7 50.0 58.3 -0.5 0 0.5 1 1.5 2 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 50 a -8.3 0.0 8.3 16.7 25.0 33.3 41.7 50.0 58.3 -2 0 2 4 6 8 10 t (s) i p (a) 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 v out (v) ip vou t i p = 50 a 1 10 100 1000 10000 1 . e+1 1 . e+2 1 . e+3 1 . e+4 1 . e+5 1 . e+6 1 . e+7 frequency (hz) i no (a/hz ? )
page 11/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series maximum continuous dc primary current figure 25: i p vs t a for cas 6-np figure 26: i p vs t a for cas 15-np figure 27: i p vs t a for cas 25-np figure 28: i p vs t a for cas 50-np the maximum continuous dc primary current plot shows the boundary of the area for which all the following conditions are true: - i p < i pm - junction temperature tj < 125 c - primary conductor temperature < 110 c - resistor power dissipation < 0.5 x rated power frequency derating figure 29: maximum rms ac primary current / maximum dc primary current vs frequency cas 6-np 0 5 10 15 20 25 30 35 40 0 20 40 60 80 100 120 t a (c) i p (a) cas 15-np 0 10 20 30 40 50 60 70 80 90 0 20 40 60 80 100 120 t a (c) i p (a) cas 25-np 0 10 20 30 40 50 60 70 80 90 0 20 40 60 80 100 120 t a (c) i p (a) cas 50-np 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 120 t a (c) i p (a) ac derating 10 100 1m 1k 10k 100k 0 0.25 0.5 0.75 1 1.25 f (hz) max rms ac current / max dc current
page 12/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series ampere-turns and amperes the transducer is sensitive to the primary current linkage q p (also called ampere-turns). q p = n p i p (at) where n p i p 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 ( n p = 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 simplifed model the static model of the transducer at temperature t a is: v out = g q p + error in which error = v oe + v ot ( t a ) + g q p g + l ( q pmax ) q pmax g + tcg ( t a -25) q p g with: q p = n p i p :the input ampere-turns (at) please read above warning. q p max :the maxi input ampere-turns that have been applied to the transducer (at) v out :the secondary voltage (v) t a :the ambient temperature (c) v oe :the electrical offset voltage (v) v ot ( t a ) :the temperature variation of v o at temperature t a (v) g :the sensitivity of the transducer (v/at) g :the sensitivity error l ( q pmax ) :the linearity error for q pmax this model is valid for primary ampere-turns q p between - q pmax and + q pmax only. performance parameters defnition 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 g is defned as the slope of the linear regression line for a cycle between i pn . the linearity error l is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of i pn . magnetic offset the magnetic offset current i om is the consequence of a current on the primary side (memory effect of the transducers ferro-magnetic parts). it is included in the linearity fgure but can be measured individually. it is measured using the following primary current cycle. i om depends on the current value i p1 . figure 30: current cycle used to measure magnetic and electrical offset (transducer supplied) i p (dc) - i p1 i p1 0 a t 1 t t ip(3) t 2 ip( 3) gt h t v t v i ou t ou t om 1 2 ) ( ) ( 2 1 ? ? =
page 13/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series response and reaction times the response time tr and the reaction time tra are shown in fgure 31. both depend on the primary current di/dt. they are measured at nominal ampere-turns. figure 31: response time t r and reaction time t ra figure 32: test connection electrical offset the electrical offset voltage v oe can either be measured when the ferro-magnetic parts of the transducer are: completely demagnetized, which is diffcult to realize, or in a known magnetization state, like in the current cycle shown in fgure 30. using the current cycle shown in fgure 30, the electrical offset is: the temperature variation v ot of the electrical offset voltage v oe is the variation of the electrical offset from 25c 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). overall accuracy the overall accuracy at 25c x g is the error in the - i pn .. + i pn range, relative to the rated value i pn . it includes: the electrical offset v oe the sensitivity error g the linearity error l (to i pn ) the magnetic offset is part of the overall accuracy. it is taken into account in the linearity error fgure provided the transducer has not been magnetized by a current higher than i pn . performance parameters defnition (continued) 2 ) ( ) ( 2 1 + = ) 25 ( ) ( ) ( ? = t ra v out t r 90 % 10 % t 100 % i p i
page 14/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series output v out the output v out 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 v out is 1 kohm. filtering and decoupling supply voltage v c the fuxgate oscillator draws current pulses of up to 30 ma at a rate of ca. 900 khz. signifcant 900 khz voltage ripple on v c 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 v out and reference v ref . 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). total primary resistance the primary resistance is 0.72 m ? per conductor in the following table, examples of primary resistance according to the number of primary turns. number of primary turns primary resistance r p [ m w ] 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 application information
page 15/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series cas 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 profle maximum 260c 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 manufacturers 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.
page 16/16 8march2012/version 7 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com cas series dimensions cas series (in mm. general linear tolerance 0.25 mm) connection

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