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LRC06JTREA0M75 Datasheet(PDF) 6 Page - Token Electronics Industry Co., Ltd. |
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LRC06JTREA0M75 Datasheet(HTML) 6 Page - Token Electronics Industry Co., Ltd. |
6 / 58 page Design & Select Current Sense Resistors In order to avoid interference from stray magnetic fields, the loop area contained by the sense resistor, the voltage sense tracks and the sense circuit input should be minimised. This means keeping the sense circuitry as close as possible to the sense resistor and running the voltage sense tracks close to each other. Point 5 - High Frequency Applications Where transient or AC currents involving high frequencies are to be sensed, the self-inductance of the resistor must be minimised. Wirewound or spiralled film parts should be avoided, in favour of bulk metal or low value chips. Point 6 - High Heat Dissipation When using a metallic element shunt with high heat dissipation and low sense voltage, consideration may need to be given to thermoelectric voltages. The junction between a metallic resistance element and metal terminations acts as a thermocouple, generating a voltage proportional to the temperature difference across it. A leaded metallic element sense resistor is therefore like two thermocouples back to back. This means that, if the temperature differences across both junctions are equal, the error voltage is cancelled out. This is achieved by making the design thermally symmetrical, namely, by presenting both terminals with similar heatsinking and by keeping any other heat sources thermally distant. 04 of 56 Version 2010 http://www.token.com.tw/ rfq token.com.tw TOKEN |
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