'Constant-DCR' power inductors

19 March 2008 Passive Components

BI Technologies has developed a ‘constant-DCR’ surface mount power inductor, designed for multiphase voltage regulator applications, including powering CPUs. Designated the HM69S Series, the inductor maintains an almost constant DC resistance value, with a shift of only ±2% at room temperature and 7% over a 100°C temperature range.

According to David Smolik, director of product development for BI Technologies, power electronics engineers often use the resistance of the inductor to detect current in a PWM circuit because the inductor’s DCR is lossless and quite accurate. “While this is a good means of detecting current, stability over the temperature range must be compensated due to the use of a copper conductor, which is typically unstable with TCR at 3900 ppm/°C,” said Smolik. “By developing an inductor with a TCR of 700 ppm/°C, we are able to provide customers with a much more stable and accurate device, one that does not require thermal compensation for the resistance change of the copper conductor.”

The power inductor features an inductance range of 90 nH to 200 nH, with a maximum rated DC current of 75 A and typical DCR of 0,950 mΩ. Operating temperature ranges from -40°C to +125°C, with a maximum temperature rise of +40°C. Constant DC resistance over the specified temperature range is ±2%.

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