DVK91206

Development Kit MLX91206 Development Kit MLX91206 REV002 – 2011 1 Description The development kit provides the needed information and components to develop a current sensor based on the MLX91206. The main goal is to show the functionalities and the features of the part in a simple and effective way. The kit includes: • • • • • • • 1 MLX91206CAL mounted on PCB_EC01 1 MLX91206CAL mounted on PCB_EC02 1 separate MLX91206CAL 3 separate MLX91206CAHs 1 separate PCB_EC01 1 separate PCB_EC02 2 shields U_12 The kit does not include a bus bar. Datasheet and Application Note can be found on www.melexis.com REV002 Page 1 of 10 2011 Development Kit MLX91206 2 Specification of EC-01 The included PCB utilizes PCB traces for medium current range measurements. Layer: Two layer with copper thickness 105µm The top layer is a conductor The bottom layer is an expanded ground layer TOP- layer Current: Dimension [l/b/h]: Bottom- layer We recommend(1): MAX 30A RMS for PCB application MAX 1kA for Bus bar application 36.8mm x 30.5mm x 1.6mm (1): The maximum current is limited by the PCB. For higher currents (> 30A), one can use an external conductor (i.e. a bus bar). 3 Specification of EC-02 The included PCB is based on PCB loops for small current range measurements. Layer: Current: Dimension [l/b/h]: Four layers, Top- and Bottom- layer with copper thickness 105µm, Second- and the Third- layer with copper thickness 35µm Three loops are on the PCB Top- layer Second- layer Third - layer Bottom- layer (1) We recommend : MAX 30A RMS for PCB application MAX 1kA for Bus bar application 36.8mm x 30.5mm x 2mm (1): The maximum current is limited by the PCB. For higher currents (> 30A), one can use an external conductor (i.e. a bus bar). REV002 Page 2 of 10 2011 Development Kit MLX91206 4 Details about the “multi-turn” concept The purpose of the EC-02 and EC-03 PCBs is to offer a “coil-like” design, which acts as 3 windings (or 6 in the EC-03 case), in order to increase the sensitivity of the sensor. The PCB consists in 3 layers: top, second and third. This design allows the current flowing 3 times (6 times with the EC-03) below the sensor, increasing the field (and the sensitivity) as with a coil. 5 Sensor sensitivity Product Code MLX91206 MLX91206 MLX91206 MLX91206 MLX91206 MLX91206 MLX91206 Ordering Option Code CAL-001 CAL-002 CAL-003 CAH-001 CAH-002 CAH-003 CAH-004 Sensitivity Range (Typ.) 460-700mV/mT (580mV/mT) 300-470mV/mT (380mV/mT) 200-310mV/mT (250mV/mT) 210-330mV/mT (270mV/mT) 130-220mV/mT (170mV/mT) 80-140mV/mT (110mV/mT) 60-110mV/mT (77.5mV/mT) 6 Schematic CON1 on the PCB EC-01 and EC-02: Pin # 1 2 3 4 REV002 Connected to GND/VSS VDD OUT/PWM TEMPOUT Page 3 of 10 2011 Development Kit MLX91206 7 U_12 shield description The shield is made of soft ferromagnetic material (i.e. low cost Fe-Si or Ni-Fe alloys) with a high µr value, this attracts and concentrates the magnetic flux. In order to get a low hysteresis the shields are annealed after shaping. Any applied mechanical stress will deteriorate the performance and should be avoided. The purpose of the shield is to concentrate the wanted signal and to reduce the influence of stray fields. Our shield is usable for both bus bar and PCB applications. 7.1 Geometry View Dimension [mm] Y = thickness =0.8mm • • • • • Material: Mu - Metal with 48%Ni Shielding factor is > 50 in the linear range Nonlinearity is < 0.05mT in the linear range The onset of the saturation starts at about ±25mT Weight: 3.14g 7.2 Good to know about shield Simulation REV002 Recommendation • The closer the sensor to the ground plate of the shield, the better the shielding against external stray fields
try to position the sensor as close as possible to the ground plate of the shield • The higher and longer the shield the better the shielding
choose the right dimension for your application • The closer the sensor to the bus bar the better is the signal to noise ratio
try to position the sensor as close as possible to the bus bar Page 4 of 10 2011 Development Kit MLX91206 8 Typical output 8.1 Typical output with PCB_EC-01 Sensitivity [mV/A]: Current range [A]: REV002 without shield 91206CAH-003 91206CAL-003 12.7 28 +/-200 +/-70 Page 5 of 10 with shield 91206CAH-003 91206CAL-003 18.7 42.5 +/-135 +/-50 2011 Development Kit MLX91206 8.2 Typical output with PCB_EC-02 Sensitivity [mV/A]: Current range [A]: REV002 without shield 91206CAH-003 91206CAL-003 27.5 62 +/-90 +/-30 Page 6 of 10 with shield 91206CAH-003 91206CAL-003 40.7 92.5 +/-50 +/-18 2011 Development Kit MLX91206 8.3 Typical output with bus bar Sensitivity [mV/A]: Current range [A]: • without shield 91206CAH-003 91206CAL-003 3.6 8 +/-600 +/-240 with shield 91206CAH-003 91206CAL-003 12.2 24 +/-250 +/-100 The dimension of the used copper bus bar was 12mm x 100mm x 2mm. REV002 Page 7 of 10 2011 Development Kit MLX91206 9 Possible programming 9.1 OFFSET vs. XA parameter 5000 Sum of OUT1 [mV] 4500 4000 3500 OUT [mV] 3000 2500 2000 1500 1000 500 0 0 500 1000 1500 2000 2500 3000 3500 4000 XA parameter • Possible to set the offset voltage between 300 and 4700 mV 9.2 OUT vs. CURRENT with different ROUGHGAIN and FINEGAIN 5000 Sum of OUT1 [mV] REMARK ROUGHGAIN FINEGAIN CHAR_200A - 1 - 0 CHAR_200A - 1 - 1000 CHAR_200A - 2 - 0 CHAR_200A - 2 - 1000 CHAR_200A - 3 - 0 CHAR_200A - 3 - 1000 CHAR_200A - 4 - 0 CHAR_200A - 4 - 1000 CHAR_200A - 5 - 0 CHAR_200A - 5 - 1000 CHAR_200A - 6 - 0 CHAR_200A - 6 - 1000 4500 OUT [mV] 4000 3500 3000 2500 2000 0 25 50 75 100 125 150 175 200 225 Current [A] • • 250 275 300 Field >25mT Measurements based on bus bar 12mm x 100mm x 2mm Demonstrators can be build for ranges from ± 50A to ±250A REV002 Page 8 of 10 2011 Development Kit MLX91206 9.3 Sensitivity vs. ROUGHGAIN with different FINEGAIN Sum of Sensitivity [mV/A] 50 45 40 Sensitivity [mV/A] 35 30 REMARK FINEGAIN 25 CHAR_200A - 0 CHAR_200A - 1000 20 15 10 5 0 0 1 2 3 4 5 6 7 ROUGHGAIN [digits] • Adjustable sensitivity range from 2mV/A to 40mV/A REV002 Page 9 of 10 2011 Development Kit MLX91206 Examples of possible demonstrators with MLX91206: Melexis will be happy to support you design-in. Please feel free to contact us for further questions. Sebastien Grisot Application Engineer sgt@melexis.com REV002 Page 10 of 10 2011