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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