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Thick film shunt resistors with 4W rated power

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By Nick Flaherty


Rohm has developed a series of thick-film shunt resistors optimized for industrial and consumer applications with power levels up to 4W supported by a new web-based simulation tool.

The LTR100L series achieves the industry’s highest rated power of 4W in the 3264 size (3.2mm × 6.4mm) / 1225 size (0.12in × 0.25in) by revising resistor materials and applying terminal temperature derating. This makes the series suitable for current detection in motor control and overcurrent protection circuits for industrial and consumer applications, which are progressing towards higher power.

Optimization of the element structure reduces the TCR (temperature coefficient of resistance) characteristics to less than 300ppm/°C at 10mΩ. This reduces the change in resistance value due to temperature changes compared with standard products by 50 to 65 percent, enabling high accuracy current detection that improves application reliability.

Rohm has also launched a web-based simulation environment that enables thermal simulation of shunt resistors in combination with power devices and ICs on its website (starting with the PSR series). These simulations allow thermal design – an issue during application design – to be simulated in advance, reducing design load. Rohm also offers current detection solutions utilizing ICs along with discrete components that contribute to greater circuit efficiency and miniaturization. As an example, for motor drive circuits that require current detection for overcurrent protection and control using its low noise operational amplifiers together with shunt resistors results in high accuracy current detection.

Samples of the LTR100L can be purchased from one piece from online distributors Digi-Key, Mouser, and Farnell (starting with samples at 10mΩ, 47mΩ, and 91mΩ) with pricing from $1.57. Simulation Models will also be released.

www.rohm.com/solution-simulator

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