Power Management

Steve Taranovich
Editor
In-depth technical information, product advancements, and industry news for engineers responsible for designing, specifying, or selecting power sources for electronics applications. Topics include power supplies, power management and regulation components, batteries, digital power, and alternative energy technology.

Help us complete EDN's print collection

EDN's 57-year collection of print issues is missing just a few from the final year. Please help us complete the set. Read More...

Book review: Microelectronic Circuit Design for Energy Harvesting Systems

Energy harvesting will be much needed with the coming IoT because of the ‘billions’ of sensors that are expected to be deployed over the next five to ten years. Read More...

Product Engineering: The bridge between design and manufacturing

Product engineers at Maxim Integrated put first silicon through its paces, verifying specs and functions. They also make sure that test engineering has what it needs for manufacturing test. Read More...

Der alte battery

What are the chances of a battery getting really old and thus achieving the status of "der alte battery"? Read More...

New LED lamp performance specs for California

Light bulb manufacturers who want their LED products to qualify for “Golden State” rebates will now have to meet new efficacy and performance requirements. Read More...

How to achieve low radiated emissions with fully integrated data and power isolation

Isolation prevents DC and unwanted AC between two parts of a system, while still allowing data and power transfer between those two parts. Read More...

Book review: Fundamentals of Power Supply Design

This book is an organized and well-written technical compendium of many years of Unitrode educational seminars which were created and presented by renowned Unitrode and Texas Instruments experts. Read More...

The Littelfuse Silicon Valley Technology Center takes research and development to the next level

I had the pleasure of visiting with Clifton Tsang, Ph.D, Senior Materials Engineer at this new technology center and I saw how Littelfuse research and development capabilities will be taken to the next level. Read More...

EPC eGaN moves closer to the ideal capabilities of the power element

Efficient Power Conversion's Generation 5 process enhancements bring improved performance while decreasing the cost of off-the-shelf GaN transistors and shrinking their die size and board footprint. Read More...

The next best power management solution to zero power is nanoPower

With the growth of wearable designs and other battery-powered consumer solutions for the IoT, circuit designers are demanding the longest battery life possible from the tiniest board footprint IC. The caveat is they also want more functionality. Read More...

DC Transformer? Forward converter? Isolation amp? You decide!

Do you think this reader-submitted circuit is a revolutionary DC transformer, or just a slightly different viewing angle onto pre-existing concepts? Read More...

Cloud data center server power and optical transceivers: a dynamic duo

Here are two very key solutions for the power and communications technology used in data servers. Read More...

Measuring appliance power consumption

Most engineers like to be efficient and conserve. To that end, this engineer compared two ac power meters by testing them around the house. Read More...

Power quality monitoring technology: helping industrial equipment stay healthy

Monitoring inputs and disturbances generated by the load can provide appropriate protection to equipment and help identify suitable mitigation techniques that improve power quality. Read More...

>> SEE ALL

Protect your boost converter

This Design Idea addresses boost converters’ inherent short-circuit vulnerability while also providing reverse-polarity protection. Read More...

Body diodes simplify UPS & energy recovery circuits

This circuit sketch shows how to turn body-diode lemons into lemonade. Read More...

Capacitor self-diagnostics

Electrolytic capacitors are often a system’s weak link. This Design Idea helps you keep tabs on their condition. Read More...

LTC Design Note: 42V quad monolithic synchronous step-down regulator with 30μA quiescent current

This circuit impresses with four 2.2MHz bucks in a tiny package. Read More...

Charge-pump topology doubles voltage, breaks DC path

This unusual charge-pump voltage multiplier Design Idea not only doubles the input, but has a pseudo-floating output. Read More...

Circuit delivers constant power to a load

Here’s a novel way to supply constant power to an ill-defined load. Read More...

LTC Design Note: Determine balancing current for the LTC3305 lead-acid battery balancer

Delve into PTC thermistor intricacies to optimize battery-balancing designs. Read More...

LM317 smooths but doesn't regulate

I once needed to clean up a power supply output, but it didn't need to be regulated. Read More...

UVP protects rechargeable batteries

Protect rechargeable batteries from deep discharge with this UVP & load switch. Read More...

New slope compensation method stabilizes switchers

Add slope compensation to any switching controller and topology. Read More...

Circuit remotely adjusts PSU voltage

This DI circuit allows for remote regulator/PSU programmability or trimming. Read More...

LTC Design Note: 55V High efficiency buck-boost power manager and multi-chemistry battery charger

A versatile, efficient, multi-chemistry battery charger design operates in buck & boost modes. Read More...

Shunt circuit clips large transients or regulates voltage

This clipper/shunt Design Idea is scalable from low to very high currents. Read More...

LTC Design Note: Control the voltage of a remote load over any length of copper wire

Read about how a unique component compensates for DC conductor loss without using extra sense wires. Read More...

AC power measurement uses PWM & PAM

Use clever pulse modulation techniques to multiply signals and measure power. Read More...

MOSFET-based Joule Thief steps up voltage

This Design Idea illustrates a novel approach to the Joule Thief circuit. Read More...

Simple SSR has zero-cross on/off switching

This AC solid-state relay enables zero-cross switching with quite a simple design. Read More...

Transient load gives power systems a workout

Verify power supply performance with this transient load generator. Read More...

Series-connected MOSFETs increase voltage & power handling

A constant-current charger for a high-energy capacitor bank uses multiple MOSFETs to increase voltage and power-handling capabilities. Read More...

>> SEE ALL

Multiphase controllers power VR13-based CPUs

STMicroelectronics’ PM6773 and PM6776 dual-channel step-down controllers offer 3+1 and 6+1 phase-programmable operation, respectively. Read More...

Efficient bus converter cuts cooling costs

Ericsson’s PKB4413DA is a low-profile 408 W DC/DC converter that furnishes a tightly regulated 12 V output at up to 34 A. Read More...

300 W modules expand converter lineup

TDK-Lambda’s PH-A280 series of half-brick DC/DC converters includes power modules that deliver 50 W, 75 W, 100 W, 150 W, and now 300 W. Read More...

Current controller offers bidirectional operation

AEC-Q100-qualified, the LM5170-Q1 buck/boost controller from Texas Instruments transfers power between dual automotive battery systems. Read More...

IC protects rechargeable battery packs

A highly integrated battery-pack monitor, the ISL94202 from Intersil provides automatic shutdown and recovery from out-of-bounds conditions. Read More...

Quarter-brick converters deliver 85 W

TDK-Lambda has added 85-W units to its HQA lineup of DC/DC converters for use in harsh industrial environments and COTS applications. Read More...

EPC eGaN moves closer to the ideal capabilities of the power element

Efficient Power Conversion's Generation 5 process enhancements bring improved performance while decreasing the cost of off-the-shelf GaN transistors and shrinking their die size and board footprint. Read More...

The next best power management solution to zero power is nanoPower

With the growth of wearable designs and other battery-powered consumer solutions for the IoT, circuit designers are demanding the longest battery life possible from the tiniest board footprint IC. The caveat is they also want more functionality. Read More...

10-bit oscilloscopes fill gap between lower and higher models

The RTB2000 series from Rohde & Schwarz covers 70 MHz to 300 MHz with a 10-in. capacitive touchscreen display. Read More...

Rugged supplies span 50 W to 1200 W

Powerbox’s Defense line of power supplies for demanding environments comprises three DC/DC series and four AC/DC series. Read More...

Converters speed transient response

Step-down converters in the XC9273 series from Torex employ an on-time architecture to achieve fast transient response and high efficiency. Read More...

DC/DC modules achieve high power density

Vicor has added 160-W and 375-W models to its DCM series of regulated DC/DC converters in the ChiP (Converter housed in Package) format. Read More...

Keysight adds 50/70/100 MHz oscilloscopes for educators, small labs

The InfiniiVision 1000 X-Series brings higher-end features within budgets of educators, small labs, and even individuals. Read More...

Low-profile buck modules deliver 10 A

TI’s TPSM84A21 and TPSM84A22 DC/DC modules need a single external voltage-setting resistor to form a complete 12-V step-down power solution. Read More...

DC/DC regulator saves PCB space

Targeting high-density POL applications, the IR3883 voltage regulator from Infineon packs an on-chip PWM controller and MOSFETs. Read More...

Supplies meet medical safety standards

Offering multiple outputs, AC/DC power supplies in Polytron’s MUI40 and MUI65 series provide 40 W and 65 W of output power, respectively. Read More...

>> SEE ALL

Teardown: Is the Mighty Charger a good investment?

Is a charger for alkaline batteries a good investment? And what internal circuitry helps it accomplish this objective? This review and teardown project attempts to answer both questions. Read More...

Teardown: Apple iPhone 6 Plus battery

A look at Apple's iPhone 6 battery helps nail down the one variable that determines manufacturing cost. Read More...

Teardown: Cell-phone charger: nice idea done right

The Mophie juice pack powerstation mini smartphone and USB-device battery charger demonstrates the ability to provide more than twice the battery life to your smartphone while still keeping a low-profile shape that slips right into your pocket. Read More...

Teardown: Gigabit Ethernet switch shut down by lightning strike

A lightning bolt-generated EMP may have entered through the switch's port(s) and KO'd the controller inside. What are your theories? Read More...

Teardown: Samsung Galaxy S4

TechInsights examines the innards of Samsung's latest and greatest smartphone. Read More...

Cell-phone charger: nice idea, bad implementation

Now and again you come across a device that’s so simple, useful, and functional that you’re glad to add it to your already-overladen workbag; that is, until it breaks, for the dumbest of design reasons. Read More...

Teardown: The power inverter - from sunlight to power grid

This teardown of a solar inverter card traces the path of harvested DC power from the photovoltaic panel, through boost conversion, power inverter and massive filtering of the created AC power signal required by the power grid. Surrounded by monitoring and microcontroller magic along with safety standard adherence, we uncover the mysteries of solar energy harvesting electronics. Read More...

Evaluate your application's energy-harvesting vibrational profile with a Slam Stick

To know whether your application is suitable for vibrational energy harvesting, you must determine its vibrational profile. Mide Technology's Slam Stick data logger and open-source software can ease your profiling task. Read More...

What's inside a smart meter? iFixit tears it down

When iFixit's Kyle Wiens had the opportunity to tear down an Elster smart meter, he jumped at it—not to come up with a repair manual but to evaluate the health and safety issues that seem to surround the utilities’ installation of smart meters. Read More...

Simple battery technology packs in more features with complex chemistries

The basic components are the same across all rechargeable lithium-ion cells, the workhorses of portable energy storage. Read More...

>> SEE ALL

Book review: Microelectronic Circuit Design for Energy Harvesting Systems

Energy harvesting will be much needed with the coming IoT because of the ‘billions’ of sensors that are expected to be deployed over the next five to ten years. Read More...

Product Engineering: The bridge between design and manufacturing

Product engineers at Maxim Integrated put first silicon through its paces, verifying specs and functions. They also make sure that test engineering has what it needs for manufacturing test. Read More...

How to achieve low radiated emissions with fully integrated data and power isolation

Isolation prevents DC and unwanted AC between two parts of a system, while still allowing data and power transfer between those two parts. Read More...

Book review: Fundamentals of Power Supply Design

This book is an organized and well-written technical compendium of many years of Unitrode educational seminars which were created and presented by renowned Unitrode and Texas Instruments experts. Read More...

The Littelfuse Silicon Valley Technology Center takes research and development to the next level

I had the pleasure of visiting with Clifton Tsang, Ph.D, Senior Materials Engineer at this new technology center and I saw how Littelfuse research and development capabilities will be taken to the next level. Read More...

Cloud data center server power and optical transceivers: a dynamic duo

Here are two very key solutions for the power and communications technology used in data servers. Read More...

Power quality monitoring technology: helping industrial equipment stay healthy

Monitoring inputs and disturbances generated by the load can provide appropriate protection to equipment and help identify suitable mitigation techniques that improve power quality. Read More...

Selecting the right sense resistor for motor control with reinforced isolation

This article presents a summary of the differences in standards between traditional optocoupler-based technologies and inductive and capacitive technologies for reinforced isolation. Read More...

Introduction to lithium-ion rechargeable battery design

This article will provide an overview on how to design a lithium-ion battery. It will look into the two major components of the battery: the cells and the electronics. Read More...

A step-by-step guide to power supply sequencing and supervision, Part 2

LTpowerPlay is the best way to interface with the LTC2937 over the I2C bus. Read More...

>> SEE ALL

Der alte battery

What are the chances of a battery getting really old and thus achieving the status of "der alte battery"? Read More...

New LED lamp performance specs for California

Light bulb manufacturers who want their LED products to qualify for “Golden State” rebates will now have to meet new efficacy and performance requirements. Read More...

DC Transformer? Forward converter? Isolation amp? You decide!

Do you think this reader-submitted circuit is a revolutionary DC transformer, or just a slightly different viewing angle onto pre-existing concepts? Read More...

Measuring appliance power consumption

Most engineers like to be efficient and conserve. To that end, this engineer compared two ac power meters by testing them around the house. Read More...

Rescued analog oscilloscope works fine, still has value

When an LG OS-5020 analog oscilloscope was saved from destruction and came my way, I just had to try it out. Read More...

Batteries safe for use in humans and fish

There are niche needs and opportunities for highly non-standard power cells, especially for use in living creatures that require biocompatible batteries. Read More...

New Ecodesign Working Plan presents new energy efficiency priorities

Late last year, the European Commission published its long-awaited Ecodesign Working Plan, which presents new energy efficiency priorities. Read More...

Is make or buy still a choice for AC/DC supplies?

The classic make-versus-buy decision for line-operated external supplies is now heavily tilted toward buy due to the many regulatory demands and constraints on supply performance. Read More...

Listening for short circuits

When troubleshooting, it pays to listen, especially when your ears are about the only diagnostic tool you have and a teen’s social life is on the line. Read More...

Selecting a space-grade isolated DC-DC

Selecting the most appropriate DC-DC for your project requires the consideration of many factors: first and foremost, what are the specific power, voltage, and current requirements? Read More...

December 1, 1995: EDN launches this site

EDN launched ednmag.com in December 1995. Eighteen years later, edn.com stood alone. Here's how it came about and what it looked like along the way. Read More...

Samsung Galaxy Note 7: Explosion diagnosis and prevention

Samsung's Galaxy Note 7 woes are only the latest in a long line of lithium-ion-battery-induced product issues, which is not expected to dissipate any time soon, and in fact may further accelerate. Read More...

Proprietary AC/DC adapters: Good idea or nasty trick?

Those simple, often interchangeable AC/DC adapters are now neither in some cases; what's the impact on the end-user? Read More...

>> SEE ALL

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