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MLX91205KDCAAH-003TU Datenblatt(PDF) 8 Page - Melexis Microelectronic Systems |
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MLX91205KDCAAH-003TU Datenblatt(HTML) 8 Page - Melexis Microelectronic Systems |
8 / 14 page MLX91205 IMC-Hall ® Current Sensor (Triaxis ® Technology) 3901091205 Page 8 of 14 Data Sheet Rev 012 June/13 12 Applications Information 12.1 Low current measurement up to ±2 A Low currents can be measured with the MLX91205 by increasing the magnetic field via a coil around the sensor. The sensitivity (output voltage vs. current in coil) of the measurement will depend on the size of coil and number of turns. Additional sensitivity and increased immunity to external fields can be gained by adding a shield around the coil. The bobbin provides very high dielectric isolation making this a suitable solution for high voltage power supplies with relative low currents. The output should be scaled to obtain the maximum voltage for the highest current to be measured in order to obtain the best accuracy and resolution. 12.2 Medium current up to ±30 A With a single conductor located on the PCB, currents in the range of up to 30 amps can be measured. The sizing of the PCB trace needs to take into account the current handling capability and the total power dissipation. The PCB trace needs to be thick enough and wide enough to handle the RMS current continuously. The differential output voltage for this configuration can be approximated by the following equation: Vout = typ. 35 - 40 mV/A * I For a current level of 30 A, the output will be approximately 1050 mV. 12.3 High current measurement up to ±600 A Another method of measuring high currents on PCB’s is to use a large thick gauge copper trace capable of carrying the current on the opposite side of the PCB. The MLX91205 should be located near the centre of the trace, however because the trace is wide, the output is less sensitive to location on the PCB. This configuration also has less sensitivity due to the distance and width of the conductor. |
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