New shunt resistors developed for products with higher rated power
This rise in demand has been fuelled by increasing computerisation in the
automotive and industrial markets, along with the rapidly expanding current
control application sector and the trend towards high-current circuit
designs. In response, Farnell element14 now stocks Rohm's PSR Series shunt
resistor which is available in the ultra-low resistance range from 0.2mohm
to 3mohm and provides high rated power (4W, 5W), making it ideal for current
detection in large-current applications.
Rohm relies on special techniques to satisfy high power requirements and
ensure high measurement accuracy even in the ultra-low-ohmic (0.2mohm)
region, which requires the ability to bond copper electrodes without
variations. This is achieved through original precision welding technology
to join the resistive metal to thick copper electrodes, achieving high heat
capacity with excellent thermal dissipation characteristics. This increases
power-handling capability (5W class) while improving productivity.
Since the temperature coefficient of resistance in metals increases as the
resistance value decreases, ROHM uses a high-performance alloy material for
the resistive metal, ensuring a superior temperature coefficient of
resistance even at ultra-low resistances, says the company.
Typical applications for the PSR series include Inverters, Li-ion battery
maintenance and charging, DC brush motors, DC-DC conversion and AC/DC