Four-Terminal Inductor Achieves High-Accuracy Current Measurements For POLs (Part 2): Sources Of Error

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

View the Source

Author & Publication:

Ron Vinsant, Vishay Siliconix, Santa Clara, Calif., How2Power Today, Jul 15 2016

This article summary appears
in the HOW2POWER Design Guide.

The Design Guide offers
organized access to
hundreds of articles
on dozens of power conversion
and power management topics.

The Design Guide search results
include exclusive summaries
and accurate "how to" analysis
to help you make faster,
more informed decisions.

Search
for more articles