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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.

Protecting against reverse polarity: Methods examined, Part 1

Reverse polarity is a dangerous electrical condition that can be difficult to prevent once a system leaves the factory, so adding circuitry that protects against its effects is an important part of improving system reliability. This article looks at the many methods for protection and weighs their tradeoffs. Read More...

Is a shark biting your product?

In the category of unexpected hazards, sharks are biting into undersea optical-fiber cables. Are the sharks sensing the electric field, or just checking out what's new in their play area? Read More...

TI integrated triple-output synchronous buck converters

Texas Instruments introduced some pretty useful integrated triple-output synchronous step-down switching regulators recently. Read More...

Lithium-Ion to primary battery power design conversion strategies

When designing with lithium-ion, safety should always be on the forefront of the design engineer’s mind to ensure that proper care is taken—especially during charging. Read More...

View noisy signals with a stable oscilloscope trigger

Without a stable trigger, oscilloscope displays can become nearly useless for measurements, documentation, and analysis. Read More...

Tattoo bio-batteries produce power from sweat

Researchers University of California San Diego have designed a sensor in the form of a temporary tattoo that can both monitor a person's progress during exercise and the tattoo biobatteries can also produce power from the perspiration. Read More...

Capacitive sensing in battery-powered devices--Design considerations

This article focuses on the effective use of the capacitive sensor electrode reference (battery ground) and presents another variable reference introduced by the user (earth). Read More...

Cracking the diode compromise

Applying VLSI memory design and production techniques to the humble power diode has enabled the development of a device combining the best characteristics of Schottky and PIN diodes while eliminating the undesirable one. Read More...

Calculation of the Power Factor in current transients and the relative uncertainty

The scope of this article is to introduce a method to measure the power factor in a 50 Hz alternating current transient. Read More...

DC Power Transmission: War of Currents compromise

So much of what we have in industry and in our homes is powered by DC (Just look at what powers the ICs in 99.9 % of our devices, appliances, etc.) Read More...

Transformer design: For which safety standards should you be concerned?

Understanding the requirements that govern transformer design and manufacturing will shorten design cycles to finished products using Fairchild parts in PSW. Read More...

Solar highway facts and fallacies

The solar highway or solar roadway is a complex concept of solar energy architectures around and in the highway, road, and street infrastructure including adjacent areas along the side of the highways and on bridges and other associated structures. Read More...

Power supply board layout capability added to TI’s WEBENCH

WEBENCH® PCB Export, is a new feature in TI’s online WEBENCH Power Designer tool that engineers can use to quickly create a power supply printed circuit board (PCB) layout and export it to industry-leading computer-aided design (CAD) development platforms. Read More...

EDN Tablet Edition: Engineering state of mind

EDN has launched a new tablet edition, find out more in this editorial note from Patrick Mannion. Read More...

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Improve efficiency of low-cost switcher

Reduce losses by over 30%, and improve Vin(min) too, on a 34063-based or similar switcher. Read More...

Variable HV power supply employs photovoltaic optocoupler

This unusual topology saved the day when a higher-voltage variable supply was needed. Read More...

Low-side switch with fast turn-off for inductive loads

Ditch the freewheeling diode if you want fast turn off. Read More...

Avago Tech Note: Driving & protecting inverter IGBTs

A special purpose optocoupler can solve your IGBT gate-drive and fault-feedback needs. Read More...

Avago Tech Note: Reduce IGBT drive cost and space

Use an application-specific optocoupler for an elegant solution to IGBT drive and monitoring. Read More...

LTC Design Note: 65V 500mA step-down converter fits automotive and industrial applications

This switcher is happy to drop a 60V input all the way down to 0.8V. Read More...

Avoid problems with multiple DC-DC converters

Improve DC-DC converter design and application, and avoid potential problems with this synchronization circuit. Read More...

LTC Design Notes: Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V

A tiny, integrated flyback converter requires minimal support components. Read More...

Smart ripple canceller offers near-zero dropout

Eliminate linear power supply ripple losslessly! Read More...

Design Notes: 60V, Synchronous Step-Down High Current LED Driver

Highly efficient high-power LED controller/driver also facilitates MPPT. Read More...

Latching power switch uses momentary pushbutton

This could be the cheapest way yet to convert a momentary switch into an on-off power controller. Read More...

Momentary switch controls mains with latch-on and remote shutdown

Convert a momentary switch into one that latches as well as protects loads from rapid cycling. Read More...

HV flyback converter improves efficiency

High-energy, high-voltage capacitor charging will benefit from the concepts in this DI. Read More...

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Step-down controller needs just 50 µA in standby mode

A synchronous step-down DC/DC controller from Linear Technology, the LTC3807 accommodates a wide input supply range of 4 V to 38 V and draws only 50 µA in standby mode with the output voltage in regulation. Read More...

Switching regulators conserve board space

Delivering high power efficiency over a wide current load, two compact DC/DC switching regulators from Rohm Semiconductor allow designers to reduce layout requirements by more than 20%. Read More...

LDO regulator boasts ultralow-noise operation

The LT3062 low-noise, low-dropout-voltage linear regulator from Linear Technology delivers up to 200 mA continuous output current with a 300-mV dropout voltage at full load, while providing a noise specification of only 30 µVRMS across a bandwidth of 10 Hz to 100 kHz. Read More...

TI integrated triple-output synchronous buck converters

Texas Instruments introduced some pretty useful integrated triple-output synchronous step-down switching regulators recently. Read More...

eFuse power switches safeguard systems

Texas Instruments has launched what it calls the industry’s smallest bidirectional 18-V, 5-A protection switches offering multiple levels of protection, extended battery life, and board space savings in portable and adapter-powered devices, as well as enterprise and client solid-state drives. Read More...

Keithley power supply measures, too

The 2280S Precision Measurement, Low Noise, Programmable DC Power Supplies provide power, measure output current and voltage and, can graph them. Read More...

Buck controller achieves high step-down efficiency

Outfitted with 3-A high-side and low-side drivers, the ISL78268 synchronous buck controller from Intersil provides high step-down efficiency for a wide variety of load currents, supporting virtually every 12-V, 24-V, and 48-V high-current buck requirement in automotive and industrial applications. Read More...

TI expands line of multichannel buck converters

Texas Instruments’ triple-output TPS65261 and TPS65262 synchronous step-down switching regulators accommodate a wide input supply range of 4.5 V to 18 V for intermediate bus voltages operating off 5-V, 9-V, 12-V, or 15-V power buses or batteries. Read More...

Switching ICs simplify CV/CC charging designs up to 10 W

LinkSwitch-3 monolithic switching ICs from Power Integrations provide accurate primary-side regulation for chargers and adapters up to 10 W, suitable for smart phones, tablets, and other mobile devices—particularly those subject to the expected 30-mW no-load limitations of the 2016 US DoE 6 EPS efficiency regulations and European CoC Tier 2 guidelines. Read More...

LED lighting design sites offer tips, tools and techniques to speed design

ON Semiconductors has launched a pair of web sites which put you one click away from a bunch of resources which could be valuable for your next LED lighting design. They've mined a lot of their deep expertise in power and analog, and applied it directly to LED-related issues in the form of design notes, app notes, white papers and videos. Read More...

Battery protector suits smart phones and tablets

Equipped with an integrated power MOSFET with a typical on-resistance of 11.2 mΩ, the LC05111CMT battery-protection controller from ON Semiconductor helps reduce the charging time of single-cell lithium-ion secondary batteries used in portable devices, such as smart phones and tablet computers. Read More...

2-W wireless power receiver targets wearables

Integrated Device Technology's IDTP9026 is what the company claims to be the world’s smallest 2-watt wireless power receiver and battery charger. Read More...

Efficient Power Conversion (EPC) A4WP compliant Wireless Power Transfer Demonstration Kit

Efficient Power Conversion (EPC) told us, in their latest introduction of Wireless Power board demos, that EPC’s New ZVS Class-D Wireless Power Transfer System Demonstration Kits were coming soon---well, just a week later they introduce the EPC9111 and EPC9112 high efficiency wireless power transfer demonstration kit delivering 35 W and operating at 6.78 MHz. These products are complete demonstration wireless power transfer kits . Read More...

Analog Devices adds ADIsimPE to its tool arsenal for fast virtual prototyping

Analog Devices has launched the ADIsimPE™ (personal edition) simulator for Linear and Mixed Signal applications capable of virtual prototyping. Read More...

Efficient Power Conversion (EPC) eGaN wireless power transfer demo system

eGaN FETs with their low output capacitance, low input capacitance, low parasitic inductances, and small size make them a good choice for increasing efficiency in highly resonant, Rezence (A4WP) compliant, wireless power transfer systems. Read More...

Linear Technology Two-Phase synchronous boost regulator with output disconnect

Linear Technology Corporation introduced the LTC3124, a dual-phase, 3MHz, current-mode, synchronous boost DC/DC converter with output disconnect and inrush current limiting. Read More...

>> SEE ALL

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: 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...

Way, way off the grid: Powering the Phoenix Mars lander

Prying Eyes: An inside look at the power-generation, -regulation, and -delivery system for the Phoenix Mars lander. Read More...

Microfuel cell enables ubiquitous computing

Prying Eyes examines a fuel-cell-based power pack for handheld devices, such as cell phones and MP3 players. Read More...

Hybrids mark the end of the stinky city bus

Prying Eyes looks inside a hybrid gas-electric bus powered by 288 ultracapacitors. Read More...

>> SEE ALL

Protecting against reverse polarity: Methods examined, Part 1

Reverse polarity is a dangerous electrical condition that can be difficult to prevent once a system leaves the factory, so adding circuitry that protects against its effects is an important part of improving system reliability. This article looks at the many methods for protection and weighs their tradeoffs. Read More...

Lithium-Ion to primary battery power design conversion strategies

When designing with lithium-ion, safety should always be on the forefront of the design engineer’s mind to ensure that proper care is taken—especially during charging. Read More...

View noisy signals with a stable oscilloscope trigger

Without a stable trigger, oscilloscope displays can become nearly useless for measurements, documentation, and analysis. Read More...

Capacitive sensing in battery-powered devices--Design considerations

This article focuses on the effective use of the capacitive sensor electrode reference (battery ground) and presents another variable reference introduced by the user (earth). Read More...

Cracking the diode compromise

Applying VLSI memory design and production techniques to the humble power diode has enabled the development of a device combining the best characteristics of Schottky and PIN diodes while eliminating the undesirable one. Read More...

Calculation of the Power Factor in current transients and the relative uncertainty

The scope of this article is to introduce a method to measure the power factor in a 50 Hz alternating current transient. Read More...

Soft management of power system hardware, a Product How-to

Power system architects and designers of digital ASIC/FPGA/microprocessor boards may be justified in being a little envious of their colleagues in software engineering if one were to consider the following advantages that the software team has over their hardware brethren. Read More...

Perform pass/fail tests with an oscilloscope

Eliminate downloading data and writing test code. Let the oscilloscope run the tests. Read More...

DC Power Transmission: War of Currents compromise

So much of what we have in industry and in our homes is powered by DC (Just look at what powers the ICs in 99.9 % of our devices, appliances, etc.) Read More...

Transformer design: For which safety standards should you be concerned?

Understanding the requirements that govern transformer design and manufacturing will shorten design cycles to finished products using Fairchild parts in PSW. Read More...

>> SEE ALL

Is a shark biting your product?

In the category of unexpected hazards, sharks are biting into undersea optical-fiber cables. Are the sharks sensing the electric field, or just checking out what's new in their play area? Read More...

Tattoo bio-batteries produce power from sweat

Researchers University of California San Diego have designed a sensor in the form of a temporary tattoo that can both monitor a person's progress during exercise and the tattoo biobatteries can also produce power from the perspiration. Read More...

Are your batteries ready to fly?

High-density lithium-based batteries are both a big boon and a large risk; on aircraft, the risk part becomes a larger factor. Read More...

Electric drive moves to two wheels

Just as Tesla brought style to the electric car market, the entry of electric vehicles from Zero and Harley Davidson promise to move the electric motorcycle market away from the traditional scooter look. Read More...

Planet Analog’s next “Ask the experts” session on Switching power voltage regulators

On Wednesday, July 23, at 1:00 p.m. ET (10:00 a.m. PT), we will we will discuss Switching Regulators, which are at the heart of many designs, especially for their efficiency which extends battery life in portable applications. Our experts will help you understand the fundamentals of this basic architecture. Read More...

TEG's potential: Is it real, a dream, or in-between?

As this advanced thermoelectric generation component shows, TEG is a viable energy-harvesting option, but its inherently low efficiency and low output voltage make using it effectively a significant challenge. Read More...

Power supply oscillation

In a nutshell, the power supply problem was as sketched below. When it was assembled by that first company, it worked okay. When it was assembled by my company's "Manufacturing" people, the power supply oscillated at 10 MHz. Read More...

Test power ICs to survive radiation

In space, power-management ICs can be subjected to radiation. Testing can assure that a part will still function, even if the silicon structure is altered. Read More...

Power smarty pants: Extreme wearable electronics

Nokia’s Portable Wireless Charging Plate DC-50 may find its way into your next pair of pants. Read More...

This battery is all wet

Redox flow batteries (RFB) represent a class of electrochemical energy storage devices. Read More...

Is this the smallest battery in widespread use?

This grain-of-rice battery is not just an interesting lab-demonstration project; hundreds have been made and are in use in the field. Read More...

A comparison of space-grade FPGAs - Part 1

FPGAs are increasingly being used in almost every spacecraft sub-system and designers now have a choice of process technologies and diverse fabrics. Which one is right for your mission? Read More...

AVSBus: What is it? Guest blog 1

This blog is the first in a 3-part series giving more details on the new AVSBus standard which is being incorporated into PMBus 1.3. Read More...

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