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LRC12JTRWRR010G Datasheet(PDF) 5 Page - Token Electronics Industry Co., Ltd. |
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LRC12JTRWRR010G Datasheet(HTML) 5 Page - Token Electronics Industry Co., Ltd. |
5 / 58 page Design & Select Current Sense Resistors Design & Select Current Sense Resistors Point 1 - Power Rating Calculate the power dissipation under operating conditions Equation: Pavg = IRMS2 × R; where Power (P), Current (I), Root Mean Square (RMS), Resistance (R).Allowing for transient or fault conditions and high ambient temperature if applicable, select the required power rating.For many current sense products, only the maximum temperature of the solder joints limits the power rating.Power rating is thus a function of the PCB layout design as well as of component selection (see point 4.). Point 2 - Resistance Value Determine the minimum suitable resistance value. This is the lowest value of peak sense voltage consistent with an acceptable signal to noise ratio, divided by the peak current to be measured. Point 3 - Temperature Coefficient of Resistance (TCR) Establish the accuracy needed in terms of a tolerance on the value and of sensitivity to temperature. The latter factor is quoted as Temperature Coefficient of Resistance (TCR), defined as the value change in parts per million for a 1°C temperature rise. It is generally higher for low value resistors because the metallic leads or terminations, which have a very high TCR, make up a significant part of the total resistance value. To achieve acceptable accuracy it is normally necessary to make four-terminal (Kelvin) connections to the resistor. This means connecting the current carrying tracks and the voltage sense tracks directly to the component pads. Even when this is done, there is still some pad area and solder in series with the resistor, which may compromise the actual tolerance and TCR of the soldered part. For very high accuracy or very low values, a four-terminal resistor type is the best choice. Point 4 - PCB Layout Care must be taken when laying out a PCB if the stated performance of a sense resistor is to be achieved. The current carrying tracks should be as wide as possible, using multiple layers connected by many vias near the component pad. This also improves the heatsinking of the joints. The best way to make four-terminal connections to a two-terminal through-hole resistor is to use different sides of the PCB for the current and voltage connections. Failing this, current and voltage tracks should connect to opposite sides of the component pad. 03 of 56 Version 2010 http://www.token.com.tw/ rfq token.com.tw TOKEN |
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