page 1/5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com 18october2011/2 automotive current transducer HC2F100-SN clips principle of hc2f clips family the open loop transducers uses a hall effect integrated circuit. the magnetic fux density b, contributing to the rise of the hall voltage, is generated by the primary current i p to be measured. the current to be measured i p is supplied by a current source i.e. battery or generator (fig. 1). within the linear region of the hysteresis cycle, b is proportional to: b (i p ) = constant (a) x i p the hall voltage is thus expressed by: v h = (r h /d) x i x constant (a) x i p except for i p , all terms of this equation are constant. therefore: v h = constant (b) x i p the measurement signal v h amplifed to supply the user output voltage or current. fig. 1: principle of the open loop transducer introduction the hc2f clips family is for the electronic measurement of dc, ac or pulsed currents in high power and low voltage automotive applications with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). the hc2f clips family gives you the choice of having different current measuring ranges in the same housing. features open loop transducer using the hall effect low voltage application unipolar + 5 v dc power supply primary current measuring range from 80 a up to 250 a maximum rms primary admissible current: defned by busbar to have t < + 150c operating temperature range: - 40c < t < + 125c output voltage: full ratiometric (in sensitivity and offset) compact design for pcb mounting. advantages excellent accuracy very good linearity very low thermal offset drift very low thermal sensitivity drift wide frequency bandwidth no insertion losses. automotive applications electrical power steering starter generators converters ... +v c -v c i p v out 0v primary current i p isolated output voltage
page 2/5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com 18october2011/2 HC2F100-SN clips si g nal +5v as i c output a m plif ie r gn d hall gnd out c2 c1 +/ - i p r1 c3 remarks general tolerance 0.2 mm v out > when i p fows in the direction of the arrow. power supply decoupling capacitor: c2 = 47 nf emc protection capacitor c3 = 4.7 nf optional: high frequency signal noise flter: r1 > 100 ? c1 = defned according to the system frequency bandwidth v c 2 dimensions HC2F100-SN clips family (in mm) secondary connection connection bill of materials plastic case pbt gf 30 magnetic core feni alloy pins and primary bus bar copper alloy tin plated (lead free) mass 6 g electronic schematic terminals designation s 3s upply voltage + 5 v dc 1v out 2g round e1 to e4 ground (*) hc2f-sn clips
page 3/5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com 18october2011/2 HC2F100-SN clips absolute maximum ratings (not operating) operating characteristics ) a / v ( i n g w i t h v g v v i c c o u t p 5 1 2 ? ? ? ? ? ? ? = parameter symbol unit specifcation conditions min typical max electrical data primary current, measuring range i pm a -100 100 @ - 40c < t < 125c supply voltage 1) v c v 4.75 5.00 5.25 @ - 40c < t < 125c output voltage (analog) v out v v out = (v c /5) x (2.5 +0.02 x i p ) @ - 40c < t < 125c sensitivity g v/a 0.0196 0.02 0.0204 @ t a = 25c; v c = 5 v offset voltage v o v 2.481 2.5 2.519 @ v c = 5 v; t a = 25c; i p = 0 a current consumption i c ma - 15 20 @ - 40c < t < 125c; 4.75 v < v c < 5.25 v load resistance r l ? 2 - - output internal resistance r out ? - - 10 performance data (1) sensitivity error g % -2.0 0.7 2.0 @ t a = 25c, v c = 5 v; gth = 0.02 v/a electrical offset i oe a -0.7 0.25 0.7 @ v c = 5.00 v; t a = 25c v oe mv -14 5 14 magnetic offset i om a -0.25 0.15 0.25 @ after excursion to i p ; t a = 25c v om mv -5 3 5 i oe tci oeav ma/c -7 4 7 @ - 40c < t < 125c; v c = 5.00 v average temperature coeffcient of v oe tcv oeav mv/c -0.14 0.08 0.14 average temperature coeffcient of g tcg av %/c -0.04 0.02 0.04 @ - 40c < t < 125c; v c = 5.00 v linearity error l % i p -1.0 0.2 1.0 @ i p ; v c = 5.00 v, t a = 25c response time t r s - 15 20 @ di/dt = 50 a/s; i t = 60 a frequency bandwidth 2) bw khz 20 - - @ -3 db; i t = 20 a rms output voltage noise peak-peak v no p-p mv - 35 43 @ t a = 25c; 0 hz < f < 1 mhz output voltage noise rms v no rms mv - - 4 @ t a = 25c; 0 hz < f < 1 mhz parameter symbol unit specifcation conditions maximun peak primary current (not operating) i p max a defned by busbar to have t 150c primary nominal dc or current rms i pn a defned by busbar to have t 150c maximun supply voltage (not operating) v c max v 7 secondary maximum admissible power p s max mw 150 ambient operating temperature t a c -40 < t a < 125c ambient storage temperature t s c -40 < t s < 125c electrostatic discharge voltage v esd v 2000 maximum admissible vibration m.s -2 100 see page 5/5 rms voltage for ac insulation test 50 hz, 1 min v d v 1500 see page 5/5 creepage distance dcp mm 1.67 clearance dci mm 1.80 cti=425 notes: 1) the output voltage v out is fully ratiometric. the offset and sensitivity are dependent on the supply voltage v c relative to the following formula: 2) small signal only to avoid excessive heating of the busbar, the magnetic core and the asic. 0 0.5 1 1.5 2 2.5 3 3.5 -100 -80- 60 -40- 20 02 04 06 08 01 00 pri ma ry current ip (a) typical global accuracy (a) @2 5 - 20c < t < 85c - 40c < t < 125c
page 4/5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com 18october2011/2 HC2F100-SN clips -1.0% -0.5% 0.0% 0.5% 1.0% 1.5% 2.0% 2.5% 3.0% 3.5% -40- 20 02 04 06 08 01 00 1201 40 t (c) mean relative gain error (%) -3 -2 -1 0 1 2 3 4 5 6 -40- 20 02 04 06 08 01 00 1201 40 temperature t (c) mean relative offset error (mv) -0.10% -0.08% -0.06% -0.04% -0.02% 0.00% 0.02% 0.04% 0.06% 0.08% 0.10% -100 -80- 60 -40- 20 02 04 06 08 01 00 prim ary current ip (a) typical linearity (% of 100a) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -100 -80- 60 -40- 20 02 04 06 08 01 00 p rimary c urrent ip (a) output voltage (v ) vout @25c vout @85c vout @125c fig. 3: typical linearity versus primary current at t = 25c fig. 4: typical output voltage versus primary current across temperatur e fig. 5: typical sensitivity error versus temperature fig. 6: typical offset error versus temperatur e influence of the external magnetic field test conditions : - transducer sample : HC2F100-SN clips - diameter of the disturbing conductor : 6 mm - dimension of the primary bus-bar : 6 x 2 x 200 mm - tested at ambient temperatur e current levels: a lem b c d e f g g1 g2 h hc2fxxx-sn i disturbed+ lem hc2fxxx-sn l i j k i disturbed+ case 1c ase 2c ase 3c ase 4 i disturban t+ 100 a- 100 a+ 100 a- 100 a i primar y0 a0 a+ 100 a+ 100 a -1 -0.5 0 0.5 1 ab cd ef g1 gg 2h ij kl positio n case1 case2 case3 case4
page 5/5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com 18october2011/2 HC2F100-SN clips sensitivity: the transducers sensitivity g is the slope of the straight line v out = f (i p ), it must establish the relation: v out (i p ) = v c /5 (g x i p + 2.5) (*) (*) for all symetrics transducers. offset with temperature: the error of the offset in the operating temperature is the variation of the offset in the temperature considered with the initial offset at 25c. the offset variation i ot is a maximum variation the offset in the temperature range: i ot = i oe max - i oe min the offset drift tci oeav is the i ot value divided by the temperature range. sensitivity with temperature: the error of the sensitivity in the operating temperature is the relative variation of sensitivity with the temperature considered with the initial offset at 25c. the sensitivity variation g t is the maximum variation (in ppm or %) of the sensitivity in the temperature range: g t = (sensitivity max - sensitivity min) / sensitivity at 25c. the sensitivity drift tcg av is the g t value divided by the temperature range. offset voltage @ i p = 0 a: is the output voltage when the primary current is null. the ideal value of v o is v c /2 at v c = 5 v. so, the difference of v o - v c /2 is called the total offset voltage error. this offset error can be attributed to the electrical offset (due to the resolution of the asic quiescent voltage trimming), the magnetic offset, the thermal drift and the thermal hysteresis. environmental test specifcations output noise voltage: the output voltage noise is the result of the noise foor of the hall elements and the linear i c amplifer gain. magnetic offset: the magnetic offset is the consequence of an over-current on the primary side. its defned after an excursion of i p max . linearity: the maximum positive or negative discrepancy with a reference straight line v out = f (i p ). unit: linearity (%) expressed with full scale of i p max . response time (delay time) t r : the time between the primary current signal and the output signal reach at 90 % of its fnal value typical: theorical value or usual accuracy recorded during the production. i p t [s] i [a] i t 90 % i s t r performances parameters definitions v out i p n o n l i n e a r i t y e x a m p l e r e f e r e n c e s t r a i g h t l i n e m a x l i n e a r i t y e r r o r l i n e a r i t y v a r i a t i o n i n i n % name standard conditions low t storage iec 60068 part 2-1 t - 40c / 100 h not connected thermal shocks iec 60068 part 2-14 t - 30c to 110c /1000 cycles not connected low toperation at min supply voltage iec 60068 part 2-1 t - 40c / 1000 h supply voltage = 4.75 v hight t operation at max supply voltage iec 60068 part 2-2 t 125c / 1000 h supply voltage = 5.25 v temperature humidity bias iec 60068 part 2-3 t 90c / 95 % rh/ 1000 h supply voltage = 5.25 v pressure cooker t 125c / 100 % rh, p 0.178 mpa/100 h supply voltage = 5 v mechanical tests vibration iec 60068-2-64 room t, acceleration 100 m/s2, frequency 20 to 500 hz/96 h each axis drop test iec 60068 part 2-29 heigh 750 mm concret foor each directions emc test electrostatic discharge jesd22-a114-b applied voltage = 2 kv pin to pin number of discharge =1
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