Cal Test Electronics recommends a 4-layer PCB with a solid ground plane and thermal vias to dissipate heat. A minimum of 1 oz copper thickness is recommended. Additionally, a thermal pad on the bottom of the device can help with heat dissipation.
To ensure accurate current measurement, it's essential to follow proper layout and routing guidelines. Keep the current sense lines short and away from noise sources. Use a Kelvin connection to the sense resistor, and ensure the sense resistor is of high precision and low temperature coefficient.
The maximum allowable voltage drop across the sense resistor is 100 mV. Exceeding this voltage drop may affect the accuracy of the current measurement.
The CT3151SP-4 is rated for operation up to 125°C. However, it's essential to consider the derating of the device's accuracy and the potential for thermal runaway. Consult with Cal Test Electronics or a thermal expert for guidance on high-temperature applications.
Calibration involves trimming the offset and gain of the device. Cal Test Electronics provides a calibration procedure in the application note. It's essential to follow this procedure carefully to ensure optimal performance.
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CT3151SP-4 Overview
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