The recommended input voltage range for the LM2917N-8 is 4.75V to 40V. However, the device can operate up to 60V with reduced accuracy and reliability.
The sense resistor value depends on the maximum current you want to measure and the desired output voltage range. A good starting point is to use the formula Rs = (Vout_max / Imax) * (R1 / R2), where Vout_max is the maximum output voltage, Imax is the maximum current, and R1 and R2 are the internal resistors (1kΩ and 2kΩ respectively).
The LM2917N-8 has a temperature range of -40°C to 125°C. Over this range, the device's accuracy and performance may vary. The output voltage may drift by ±1% over the entire temperature range, and the device's linearity may degrade at high temperatures.
The LM2917N-8 is designed to measure DC currents. While it can be used to measure AC currents with some modifications, it's not recommended as the device's internal circuitry is optimized for DC measurements. For AC current measurements, consider using a dedicated AC current sensor or a different device.
To ensure EMC, follow proper PCB layout and design practices, such as keeping the sense resistor and input traces short and away from noise sources, using a ground plane, and adding filtering components (e.g., capacitors and ferrite beads) to reduce electromagnetic interference.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
