Development Kit MLX91205 – CSA-1V Development Kit MLX91205 / CSA-1V REV003 1 Description The development kit provides the needed information and components to evaluate the current sensors MLX91205 and/or CSA-1V. The main goal is to show the functionalities and the features of the parts in a simple and effective way, without the need of investing precious time and money for develop design. The kit includes: • • • • • • • 1 MLX91205LB mounted on PCB_EC01 1 MLX91205LB mounted on PCB_EC02 1 separate MLX91205LB 3 separate MLX91205HBs 1 separate PCB_EC01 1 separate PCB_EC02 2 shields U_12 The kit does not include a busbar. Datasheet and Application Note can be found on www.melexis.com REV003 Page 1 of 9 Mar. 09 Development Kit MLX91205 – CSA-1V 2 Specification of EC-01 The included PCB utilizes PCB traces for medium current range measurements. This arrangement was created for continuous currents up to ±30 A RMS, but can handle, without damage, short current peaks up to ±50 A. The typical sensitivity obtained with this design with and without the use of a magnetic shield is shown on the last page in the typical Output diagram. 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: MAX 30A RMS for PCB application MAX 1kA for Busbar application 36.8mm x 30.5mm x 1.6mm Top view Bottom view Placeholder Placeholder for additional for additional shield shield Current IN REV003 Current OUT Page 2 of 9 Mar. 09 Development Kit MLX91205 – CSA-1V 3 Specification of EC-02 The included PCB utilizes PCB loops for small current range measurements. This arrangement was created for continuous currents up to ±30 A RMS, but can handle, without damage, short current peaks up to ±50 A. The typical sensitivity obtained with this design with and without the use of a magnetic shield is shown on the last page in the typical Output diagram. Layer: 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 Current: Dimension [l/b/h]: Top- layer Second- layer Third - layer Bottom- layer We recommend: MAX 30A RMS for PCB application MAX 1kA for Busbar application 36.8mm x 30.5mm x 2mm Top view Bottom view Placeholder Placeholder for additional for additional shield shield Current IN REV003 Current OUT Page 3 of 9 Mar. 09 Development Kit MLX91205 – CSA-1V 4 Settings 4.1 Schematic U1/ DUT: C1: C2: C3: CSA-1V or 91205 100nF 1nF 1nF VDD: GND: A_OUT: C_OUT: pos. supply voltage supply common analog sensor output common output 4.2 Measurement Single ended output measure from A_Out to GND Offset = 2500mV; Out range = 0mV - 5000mV; REV003 Differential output measure from A_Out to CO_Out Offset = 0mV; OUT range = -2500mV - +2500mV; Page 4 of 9 Mar. 09 Development Kit MLX91205 – CSA-1V 5 Shield description The shield is made of soft ferromagnetic material 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 busbar and PCB applications. 5.1 Settings 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 5.2 Good to know about shield Simulation REV003 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 busbar Page 5 of 9 Mar. 09 Development Kit MLX91205 – CSA-1V 6 OUTPUT Measurement 6.1 Sensor programming Sensor: Sensitivity: Offset: 91205HB 100V/T < 10mV CSA-1V / 91205LB 280V/T < 10mV 6.2 OUTPUT Range without Busbar (Typical values) Measured with PCB_EC-01 Sensitivity [mV/A]: Current range [A]: without shield CSA-1V / 91205HB 91205LB 12 32 +/-200 +/-70 with shield CSA-1V / 91205HB 91205LB 18 47 +/-135 +/-50 Measured with PCB_EC-02 Sensitivity [mV/A]: Current range [A]: REV003 without shield CSA-1V / 91205HB 91205LB 26 70 +/-90 +/-30 Page 6 of 9 with shield CSA-1V / 91205HB 91205LB 45 125 +/-50 +/-18 Mar. 09 Development Kit MLX91205 – CSA-1V 6.3 OUTPUT Range with Busbar (Typical values) Measured with PCB_EC-01 and PCB_EC-02 Sensitivity [mV/A]: Current range [A]: • without shield CSA-1V / 91205HB 91205LB 3 8.5 +/-800 +/-285 with shield CSA-1V / 91205HB 91205LB 9.9 28 +/-250 +/-90 The dimension of the used copper busbar was 12mm x 100mm x 2mm. REV003 Page 7 of 9 Mar. 09 Development Kit MLX91205 – CSA-1V 7 Typical output • CSA-1V shows a similar typical sensitivity as MLX91205LB 7.1 Typical output with PCB_EC-01 5000 4500 4000 Ouput [mV] 3500 3000 2500 2000 1500 1000 500 0 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 25 30 35 Current [A] 91205HB without shield 91205HB with shield 91205LB with shield 91205LB without shield 7.2 Typical output PCB_EC-02 5000 4500 4000 Ouput [mV] 3500 3000 2500 2000 1500 1000 500 0 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 Current [A] REV003 91205HB without shield 91205HB with shield 91205LB with shield 91205LB without shield Page 8 of 9 Mar. 09 Development Kit MLX91205 – CSA-1V 7.3 Typical output with bus bar 5000 4500 4000 Ouput [mV] 3500 3000 2500 2000 1500 1000 500 0 -250 -200 -150 -100 -50 0 50 100 150 200 250 Current [A] REV003 91205HB without shield 91205HB with shield 91205LB with shield 91205LB without shield Page 9 of 9 Mar. 09