AUTOMOTIVE CURRENT TRANSDUCER HCF-SN CLIPS Introduction The HCF 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 HCF 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 8 A up to 5 A Maximum RMS primary admissible current: defined by busbar to have T < + 5 C Operating temperature range: - 4 C < T < + 5 C Output voltage: full ratiometric (in sensitivity and offset) Compact design for PCB mounting. Principle of HCF CLIPS Family The open loop transducers uses a Hall effect integrated circuit. The magnetic flux density B, contributing to the rise of the Hall voltage, is generated by the primary current to be measured. The current to be measured is supplied by a current source i.e. battery or generator (Fig. ). Within the linear region of the hysteresis cycle, B is proportional to: B ( ) = constant (a) x The Hall voltage is thus expressed by: V H = (R H /d) x I x constant (a) x Except for, all terms of this equation are constant. Therefore: V H = constant (b) x The measurement signal V H amplified to supply the user output voltage or current. Advantages +V c Excellent accuracy Very good linearity Very low thermal offset drift Very low thermal sensitivity drift Wide frequency bandwidth No insertion losses. -V c V Automotive applications Primary current Isolated output voltage Electrical Power Steering Starter Generators Converters... Fig. : Principle of the open loop transducer Page /5
HCF-SN CLIPS Dimensions HCF-SN CLIPS family (in mm) Secondary connection Terminals Designations 3 Supply voltage + 5 V DC Ground E to E4 Ground (*) Connection HCF-SN CLIPS Bill of materials Plastic case PBT GF 3 Magnetic core FeNi alloy Pins and primary bus bar Copper alloy tin Mass 6 g plated (lead free) Remarks General tolerance ±. mm V C V OUT > when flows in the direction of the arrow. Electronic schematic +/- Ip Hall ASIC Output amplifier Out +5V C Gnd C3 R C Signal Gnd Power supply decoupling capacitor: C = 47 nf EMC protection capacitor C3 = 4.7 nf Optional: High frequency signal noise filter: R > Ω C = defined according to the system frequency bandwidth Page /5
Absolute maximum ratings (not operating) Operating characteristics Parameter Symbol Unit HCF-SN CLIPS Specification Min Typical Max Electrical Data Conditions Primary current, measuring range M A - @ - 4 C < T < 5 C Supply voltage ) V C V 4.75 5. 5.5 @ - 4 C < T < 5 C Output voltage (Analog) V OUT V V OUT = (V C /5) x (.5 +. x I ) @ - 4 C < T < 5 C P Sensitivity G V/A.96..4 @ T A = 5 C; V C = 5 V Offset voltage V O V.48.5.59 @ V C = 5 V; T A = 5 C; = A Current consumption I C ma - 5 @ - 4 C < T < 5 C; 4.75 V < V C < 5.5 V Load resistance R L ΚΩ - - Output internal resistance R OUT Ω - - Performance Data () Sensitivity error ε G % -. ±.7. @ T A = 5 C, V C = 5 V; Gth =. V/A Electrical offset Magnetic offset Average temperature coefficient of Parameter Symbol Unit Specification Conditions Maximun peak primary current (not operating) max A Defined by busbar to have T 5 C Primary nominal DC or current rms N A Defined by busbar to have T 5 C Maximun supply voltage (not operating) V C max V 7 Secondary maximum admissible power P S max mw 5 Ambient operating temperature T A C -4 < T A < 5 C Ambient storage temperature T S C -4 < T S < 5 C Electrostatic discharge voltage V ESD V Maximum admissible vibration γ m.s - see page 5/5 Rms voltage for AC insulation test 5 Hz, min V d V 5 see page 5/5 Creepage distance dcp mm.67 Clearance dci mm.8 CTI=45 I OE A -.7 ±.5.7 V OE mv -4 ± 5 4 I OM A -.5 ±.5.5 V OM mv -5 ± 3 5 I OE TCI OEAV ma/ C -7 ± 4 7 V OE TCV OEAV mv/ C -.4 ±.8.4 @ V C = 5. V; T A = 5 C @ After excursion to ± ; T A = 5 C @ - 4 C < T < 5 C; V C = 5. V Average temperature coefficient of G TCG AV %/ C -.4 ±..4 @ - 4 C < T < 5 C; V C = 5. V Linearity error ε L % -. ±.. @ ; V C = 5. V, T A = 5 C Response time t r µs - 5 @ di/dt = 5 A/µs; I T = 6 A Frequency bandwidth ) BW khz - - @ -3 db; I T = A rms Output voltage noise peak-peak V no p-p mv - 35 43 @ T A = 5 C; Hz < f < MHz Output voltage noise rms V no rms mv - - 4 @ T A = 5 C; Hz < f < MHz Typical global accuracy (A) 3.5 3.5.5 @5.5 - C < T < 85 C - 4 C < T < 5 C - -8-6 -4-4 6 8 Notes: ) 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: IP = V OUT VC 5 G V C with G in (V / A) ) Small signal only to avoid excessive heating of the busbar, the magnetic core and the ASIC. Primary current Ip (A) Page 3/5
I HCF-SN CLIPS Typical linearity (% of A).%.8%.6%.4%.%.% - -8-6 -4-4 6 8 -.% -.4% -.6% -.8% -.% Prim ary current Ip (A) Output voltage (V) 5. 4.5 4. 3.5 3..5 - -8-6 -4-4 6 8..5..5. Primary current Ip (A) Vout @5 C Vout @85 C Vout @5 C Fig. 3: Typical linearity versus primary current at T = 5 C Fig. 4: Typical output voltage versus primary current across temperature Mean relative gain error (%) 3.5% 3.%.5%.%.5%.%.5%.% -4-4 6 8 4 -.5% Mean relative offset error (mv) 6 5 4 3-4 - 4 6 8 4 - - -.% T ( C) -3 Temperature T ( C) Fig. 5: Typical sensitivity error versus temperature Influence of the external magnetic field Test conditions : - transducer sample : HCF-SN CLIPS - diameter of the disturbing conductor : 6 mm - dimension of the primary bus-bar : 6 x x mm - tested at ambient temperature Fig. 6: Typical offset error versus temperature Current levels: CASE CASE CASE 3 CASE 4 I disturbant + A - A + A - A I primary A A + A + A D C B.5 E HCFxxx-SN LEM A I disturbed+ A B C D E F G G G H I J K L F G G G H L -.5 K I disturbed+ - HCFxxx-SN Position case case case3 case4 LEM J Page 4/5
HCF-SN CLIPS PERFORMANCES PARAMETERS DEFINITIONS Output noise voltage: The output voltage noise is the result of the noise floor of the Hall elements and the linear I C amplifier gain. Magnetic offset: The magnetic offset is the consequence of an over-current on the primary side. It s defined after an excursion of max. Linearity: The maximum positive or negative discrepancy with a reference straight line V OUT = f ( ). Unit: linearity (%) expressed with full scale of max. V OUT Non linearity example Sensitivity: The Transducer s sensitivity G is the slope of the straight line = f ( ), it must establish the relation: ( ) = V C /5 (G x +.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 5 C. 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. Reference straight line Max linearity error Linearity variation in I N % 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 5 C. 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 5 C. The sensitivity drift TCG AV is the G T value divided by the temperature range. Response time (delay time) t r : The time between the primary current signal and the output signal reach at 9 % of its final value 9 % I [A] t r I T I S Offset voltage @ = A: Is the output voltage when the primary current is null. The ideal value of V O is V C / at V C = 5 V. So, the difference of V O -V C / 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 specifications Name Standard Conditions Low T storage IEC 668 Part - Thermal shocks IEC 668 Part -4 Low T operation at min supply voltage Hight T operation at max supply voltage IEC 668 Part - IEC 668 Part - T - 4 C / H not connected T - 3 C to C / cycles not connected T - 4 C / H supply voltage = 4.75 V T 5 C / H supply voltage = 5.5 V t [µs] Temperature humidity bias IEC 668 Part -3 T 9 C / 95 % RH/ H supply voltage = 5.5 V Typical: Theorical value or usual accuracy recorded during the production. Pressure cooker Mechanical Tests Vibration IEC 668--64 T 5 C / % RH, P.78 Mpa/ H supply voltage = 5 V Room T, acceleration m/s, frequency to 5 Hz/96 H each axis Drop test IEC 668 Part -9 Heigh 75 mm concret floor each directions EMC Test Electrostatic discharge JESD-A4-B Applied voltage = ± kv pin to pin number of discharge = Page 5/5