Datasheet ZXCT1009 (Diodes) - 6

ZXCT1009 HIGH-SIDE CURRENT MONITOR Application Information (cont.) PCB trace shunt resistor for low cost solution
The figure below shows output characteristics of the device when using a PCB resistive trace for a low cost solution in replacement for a conventional shunt resistor. The graph shows the linear rise in voltage across the resistor due to the PTC of the material and demonstrates how this rise in resistance value over temperature compensates for the NTCof the device. The figure opposite shows a PCB layout suggestion. The resistor section is 25mm x 0.25mm giving approximately 150mΩ using 1oz copper. The data for the normalised graph was obtained using a 1A load current and a 100Ω output resistor. An electronic version of the PCB layout is available through Diodes Layout shows area of shunt resistor compared to SOT23 applications group. package. Not actual size.
Effect of Sense Resisitor Material on Temperature Performance Ordering Information AEC-Q100 Reel Device Tape Width Quantity per Reel Part Marking Package level Size
ZXCT1009FTA Grade 3 7” 8mm 3000 Units 109 SOT23 ZXCT1009F-7 None 7” 8mm 3000 Units 109 SOT23 ZXCT1009T8TA None 7” 12mm 1000 Units ZXCT1009 SM8 ZXCT1009 6 of 8 April 2011 Document number: DS33441 Rev. 12 - 2
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