Four-Terminal Inductor Achieves High-Accuracy Current Measurements For POLs (Part 2): Sources Of Error
by Ron Vinsant, Vishay Siliconix, Santa Clara, Calif., How2Power Today, Jul 15 2016
Focus:
The first segment of this series introduced Vishay's four-terminal inductor and
discussed its use in measuring current in point-of-load regulators (POLs). This second
article discusses the current measurement performance of the four-terminal inductor under
various use scenarios in a synchronous rectifier that is capable of currents up to 40 A.
The focus here will be on current accuracy. This part begins by explaining our goals for
ac and dc current measurement accuracy and describing the test setup that will be used to
measure these accuracy terms. Then a series of measurements and simulations are performed
to show the influences of various component values and tolerances, instrument
specifications, load values and environmental conditions such as temperature and noise on
measurement accuracy.
What you’ll learn:
- How to understand the circuit parameters that effect current sense accuracy of four terminal inductor in high-current, point-of-load regulators
- How to measure the current-sense accuracy of DCR current sensing in POL regulators
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