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Articles by Keith Szolusha
ADI: Induktorns orientering pÃċverkar störningarna
Störningar frÃċn switchade strömförsörjningsaggregat (SMPS) beror av ett antal parametrar, inklusive den kritiska Ãċterkopplingen, stigtiden och frekvensen, in- och utgÃċngsfiltreringen, skÃĊrmningen, layouten och jordningen. En potentiell störningskÃĊlla ÃĊr Âkopplingsnoden (switch node), som kallas SW pÃċ mÃċnga kretsscheman. SW-nodens koppar kan fungera som en antenn för de störningar som genereras av snabba switchförlopp.
Komponentens orientering kritisk for EMI?
Kretskortdesign: Vil monteringsretningen til en SMPS-induktor påvirke EMI-stråling? Les hva vi fant ut. Spekteret av EMI-stråling produsert fra svitsjemodus strømforsyninger (SMPS) er en funksjon av en rekke parametere, inkludert størrelsen på «hot loop», svitsjehastighet ( stigetider) og frekvens, inngangs- og utgangsfiltrering, skjerming, layout og jordplan. En potensiell kilde til utslipp er svitsjenoden, referert til som SW på mange skjemaer.
How to Use LTspice to Produce Bode Plots for LED Drivers
August 16, 2021 Blog Proper control loop phase and gain measurements should be made by factory experts possessing (expensive) equipment and commensurate experience. For those who do not have access to one or either of these, there is an alternative. Closed-loop gain and phase plots are well-worn tools used to determine the stability of the control loop in switching regulators. Gain and phase measurements, when done properly, require access to, and familiarity with, fancy network analyzers.
How Assembly Orientation of an SMPS Inductor Affects Emissions
August 11, 2021 Blog One potential source of emissions is the switching node, referred to as SW on many schematics. The SW node copper can act as an antenna, transmitting the noise generated by fast and efficient high power switching events. This is the main source of emissions for most switching regulators.
4-Switch Buck-Boost Controller Layout for Low Emissions—Single Hot Loop vs. Dual Hot Loop - Embedded Computing Design
August 10, 2021 Blog Automotive application circuits must meet strict EMI standards to avoid interfering with broadcast and mobile service frequency bands. In this article we look specifically at two possible solutions for a 4-switch buck-boost controller and compare EMI chamber results. A 4-switch buck-boost combines a buck and boost controller into a single IC, where the converter operates as a buck when the output is lower than the input, and as a boost when the output is higher than the input.
A Practical Method for Separating Common-Mode and Differential-Mode Emissions in Conducted Emissions Testing
August 09, 2021 Blog EMI from switching regulators is broken down into radiated and conducted emissions (CE). This article focuses on conducted emissions, which can be further classified into two categories: common-mode (CM) noise and differential-mode (DM) noise. Why the CM-DM distinction? EMI mitigation techniques that are effective for CM noise are not necessarily effective for DM noise, and vice versa, so identifying the source of conducted emissions can save time and money in suppressing it.
How to use LTspice to produce bode plots for LED drivers
Article By : Keith Szolusha and Brandon Nghe, Analog Devices Inc. Proper control loop phase and gain measurements should be made by factory experts possessing (expensive) equipment and commensurate experience. For those who do not have access to one or either of these, there is an alternative. Closed-loop gain and phase plots are well-worn tools used to determine the stability of the control loop in switching regulators.
Mitigation Strategies for Tricky FM Band Conducted EMI
This article appeared in Microwaves & RF and has been published here with permission. What you’ll learn: What are the drivers of conducted and radiated emissions? Different methods for reducing FM band conducted EMI, which are simple to implement and low cost. Although EMI shields and ferrite clips are often a sought-after EMI solution, they can be expensive, bulky, and sometimes insufficient.
Designing LED Headlight Clusters to Meet CISPR 25 Class 5 EMI
>> Electronic Design Resources .. >> Library: Article Series .. .. >> Topic: Power Management .. .. .. >> Series: Driving LED Designs Members can download this article in PDF format. Automobile LED headlight clusters combine high and low beams, daytime running lights, and sometimes signal and clearance lights into a single headlight cluster.
Driving LEDs for High-Power Machine-Vision Flash
Reprinted with permission from Evaluation Engineering A whitepaper was recently released by the LoRa Alliance and the Wireless Broadband Alliance, titled “Wi-Fi & LoRaWAN Trials - An Overview of Use Cases Across Regions Combining Two Technologies." The paper provides details on practical trials and proof-of-concept deployments representing a variety of use cases implemented across different geographies and verticals.
Single 2 MHz Buck-Boost Controller Drives Entire LED Headlight Cluster, Meets CISPR 25 Class 5 EMI
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One low-EMI driver module for all headlight functions
Automobile LED headlight clusters combine high and low beams, daytime running lights, and sometimes signal and clearance lights into a single headlight cluster. The components of the cluster can have vastly different driver requirements, including voltage and current requirements, topologies, power levels or unique dimming functions. Meeting the range of requirements usually means employing separate driver solutions.
60V 2MHz Buck-boost controllers regulate high power voltage and current with high efficiency and
Synchronous buck-boost controllers are versatile and highly efficient. They can produce high power as both a boost and a buck with a single inductor, keeping power supply design simple. Normally, a buck-boost controller in a high power application is operated at a standard or low switching frequency, this maximizes efficiency and avoids complications related to shoot-through and switch blanking time, which can arise in synchronous rectification at high frequencies.
Low EMI LED Driver with Synchronous Internal 2-A Switches
These LED drivers require more features and higher performance than ever before. Higher efficiency prolongs battery life and reduces heat in space-constrained applications. Wide voltage ranges are needed to accommodate the many sources of energy and combinations of LEDs. Automotive converters must have low EMI. High PWM dimming ratios are needed for day and night display brightness control. Long off-times are needed between PWM pulses for machine vision and camera flashes.
Linear Tech: Synchronous LED driver features integrated PWM dimming
LED applications encompass everything from general lighting to automotive, industrial and test equipment, sign boards and safety equipment. As a result, the breadth of design requirements for LED drivers has expanded. The latest LED solutions require drivers that are compact, efficient, low noise, and feature high dimming ratios and advanced fault protection. This white paper describes one such LED driver.LED driving, dimming, lighting
LTC Design Note: Low EMI LED Driver features 2A, 40V synchronous switches for automotive lighting
The breadth of LED applications has grown to encompass everything from general lighting to automotive, industrial and test equipment, sign boards, and safety instruments. Feature requirements for LED drivers have become more extensive. The latest LED solutions require drivers that are compact, efficient, low noise, and have high dimming ratios and advanced fault protection. The LT3922 meets these demands.
LTC Design Note: 60V Buck-Boost LED driver has up to 98% efficiency, PWM dimming, spread spectrum
Synchronous buck-boost converters with four power switches can deliver very high efficiency while providing both step-up and step-down DC/DC conversion. Combining the capabilities of two separate converters (buck and boost) has the advantage of reduced solution size and cost. Four-switch converters should be able to operate with just two switches for highest efficiency when only step-up or step-down conversion is needed.
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