• Minimize noise and ripple with a low-noise buck converter

    Other Parts Discussed in Post: TPS62913, TPS62912

    Minimizing noise is a common challenge for engineers designing a power supply for noise-sensitive systems for test and measurement and radio applications, such as clocks, data converters or amplifiers. Although the term “noise” can mean different things to different people, in this article I’ll define noise as low-frequency thermal noise generated by resistors and transistors…

  • The impact of an isolated gate driver’s input stage for motor-drive applications

    Other Parts Discussed in Post: UCC23514, UCC5310, UCC5320, UCC5350, UCC5390

    You have many options when selecting an isolated gate driver for the power stage in motor-drive applications. Gate drivers can be simple or complex, with features such as an integrated Miller clamp, split outputs or an undervoltage (UVLO) lockout reference to the emitter of an insulated gate bipolar transistor (IGBT).

    There are two options for…

  • eFuses in factory automation: all-in-one system power protection

    “All-in-one” sounds so nice, doesn’t it? Nothing encompasses the idea of all-in-one more than the Swiss Army knife, which was first introduced to the world back in 1891 and has become something of a legend given its versatility, small size and low cost. This one tool can help solve a variety of daily challenges and is small enough to fit in your pocket. What more could you ask for?

    Now picture a factory…

  • 5 best practices to extend battery life in flow meters

    Other Parts Discussed in Post: TPS63900

    Flow meters use lithium manganese dioxide (LiMnO2) and lithium thionyl chloride (LiSOCl2) batteries as energy sources. LiSOCl2 batteries are popular in flow meters because they provide better energy density and a more efficient cost-per-wattage ratio than LiMnO2 batteries. However, LiSOCI2 batteries have a poor impulse response, which can lead to a large drop in voltage during transient…

  • Introduction to the fundamental technologies of power density

    The importance and value of power density in modern power-delivery solutions cannot be overstated.

    To better understand the fundamental technologies of high-power-density designs, in this article I’ll examine the four most important aspects of high-power-density solutions:

    • Reduced loss generation.
    • Optimal topology and control selection.
    • Effective heat removal.
    • Reducing system volume through mechanical and electrical…
  • Benefits of rechargeable batteries in real-time location system trackers

    Other Parts Discussed in Post: BQ24040, BQ21061, BQ25619, BQ25155

    Real-time location systems (RTLS) enhance the lives of consumers and businesses by making everyday routines smarter through accurate, location tracking technology such as GPS and Bluetooth® Low Energy. RTLS trackers eliminate the stress of losing belongings such as luggage or pets using long-distance GPS tracking. RTLS trackers also enhance businesses with…

  • Meet airline restrictions with power-path control for dual batteries

    Other Parts Discussed in Post: LM74700-Q1

    With the Federal Aviation Administration restricting the size of batteries allowed on airplanes, it can be challenging to design applications with batteries down to 100 Wh. Some companies design applications using two small batteries instead of one to meet the regulations, but having two batteries often requires the implementation of redundant or duplicate power supplies, which…

  • Overcoming challenges for backlight LED drivers in automotive display solutions

    Other Parts Discussed in Post: LP8866-Q1

    High resolution and seamless operation are important for larger automotive display screens, shown in Figure 1, as consumers want a clear picture with smooth functionality. Given the harsh environments in vehicles, system reliability and safety are also concerns. As a result, it’s a challenge for designers to find a backlight LED solution that’s designed for larger screens while…

  • Simplifying radiation-hardened power-supply design with eFuses

    Today’s satellites use complex, high-power field-programmable gate arrays (FPGAs) and processors, challenging power-supply design engineers to create robust power supplies. Many designers end up with complicated designs meant to achieve redundancy (the duplication of critical components to increase reliability), involving dozens of discrete components like field-effect transistors (FETs) to continuously monitor and enable…

  • Ease power-supply design for USB PD applications with buck-boost converters

    Other Parts Discussed in Post: TPS55288

    USB technology has evolved – from a data interface capable of supplying limited power to a primary power source with an interactive data interface. Today, many devices charge or get their power from USB ports contained in laptops, cars, aircrafts or even wall sockets.

    Because of its compact size and ability to both deliver power and transfer data, USB Power Delivery (PD) has…

  • Maximize power density with buck-boost charging and USB Type C™ Power Delivery

    Other Parts Discussed in Post: BQ25790, BQ25792

    The buck-boost charger has become increasingly popular in recent years given its ability to charge a battery from nearly any input source, regardless of whether the input voltage is higher or lower than the battery voltage.

    One critical benefit of the widespread adoption of USB Type-C is a realistic path to a universal adapter and corresponding e-waste reduction. Although…

  • Universal and fast charging – a future trend for battery-powered applications

    Other Parts Discussed in Post: BQ25790, BQ25792

    Today’s “always-on” consumer wants to charge their portable electronics wherever they are. For example, it’s common to see travelers charging their cellphones, laptops and headphones while waiting to board a flight or hop on a train. But when there are different charging methods for each device, these consumers must carry different adapters, and it can become quite a hassle…

  • 5 questions to ask when designing with rechargeable batteries for personal care products

    Other Parts Discussed in Post: BQ25306

    Beauty and personal care products have traditionally been designed with a traditional AC power supply. Therefore, every time consumers use such products, they need to be close to the wall, and any movement and power is restrained by the length of the electrical cord. As modern electronics have evolved, consumers now expect to be able to use personal care products such as a shavers…

  • What type of ESD protection does your MOSFET include?

    Power metal-oxide semiconductor field-effect transistors (MOSFETs) use a thin oxide to isolate the gate electrode from the active area of the transistor. Much like the MOSFET structures used in the fabrication of microprocessors, a power MOSFET gate oxide is just as susceptible to damage from electrostatic discharge (ESD) as its tinier counterparts. ESD may cause catastrophic failure (such as gate-oxide breakdown) or…

  • Understanding and managing buck regulator output ripple

    Dan Tooth co-authored this technical article

    Your new design needs to fit twice as much into half the space and cost nothing – sound familiar? You selected the smallest point-of-load regulator and generated the tightest layout you could with the most cost-effective passive components. So far so good. But then you look at the output ripple on your critical rails and it’s not what you expected. What’s going on?…

  • How to raise regulation performance with a stacked-output PSR flyback DC/DC converter

    Other Parts Discussed in Post: LM25184, LM5180

    For low-power isolated designs that require an extended product life cycle, such as gate-driver bias for automotive traction inverters, or 4- to 20-mA loop sensors in field transmitters for factory automation applications, many designers choose to leverage the reliability and simplicity of a primary-side regulated (PSR) multioutput flyback converter. Two key attributes of…

  • How modern voltage references help shrink small designs

    Anyone designing electronic products is forced to make a trade-off between adding modern features and trying to fit everything into the available space. As electronic designs advance, every iteration of new technology demands more creativity. Adding new, complex features while increasing power density and decreasing the size of the power supply becomes a key priority. While this problem spans almost every application…

  • CURRENTly questioning the accuracy of your battery monitor? Improve battery safety and accuracy with these tips

    Other Parts Discussed in Post: BQ76952, BQ76942

    The current flowing to or from a battery pack is measured and used for several different purposes. For example, if a removable battery pack from a power tool has an accidental short, huge currents may flow and lead to an unsafe situation. Large currents may similarly flow if an appliance with an embedded battery (such as a vacuum cleaner) malfunctions internally, possibly…

  • Advantages of scalability: from Peter Parker to pin-strapping

    Typically, scalable characteristics are something that Spider-Man looks for in a building. And although power-supply design may not seem like your typical superhero activity, the scalability of your design is often just as important as meeting the requirements of the application you’re designing for. What better way to enable this versatility than to use a scalable device family?

    A scalable device family is a set…

  • How to reduce audible noise and power consumption at standby in your AC/DC design

    Other Parts Discussed in Post: UCC256404, UCC256403, UCC28056, UCC24624

    To meet evolving energy regulations that require lower standby power and higher efficiency, engineers are designing power supplies that use light-load modes such as burst-mode operation. Although light-load modes help minimize standby power, they introduce a new challenge: the potential for the power-supply magnetics to emit high-pitch ringing. If…

  • The ABCs and 123s of PoE

    Power over Ethernet (PoE) is a long-established – and well-adopted – power delivery technology that injects power over 100 m of standard CAT 5 Ethernet cable. This technology radically simplified installation for end equipment such as Internet Protocol (IP) phones, wireless access points for Wi-Fi® connections and IP cameras, and provides features such as power redundancy and smooth power-source transitions (also called…

  • Improving voltage measurement accuracy in battery monitoring systems

    Other Parts Discussed in Post: BQ76952, BQ76942

    As reviewed in my earlier article, accurate monitoring of battery voltage, current and temperature is necessary to ensure the safe operation of battery-powered systems such as vacuum cleaners, power tools and e-bikes. In this article, I will focus on voltage monitoring of lithium-based batteries.

    A key requirement of safety standards for lithium-based battery systems is that…

  • Advantages of the STOP function for low-noise data-acquisition applications

    Other Parts Discussed in Post: TPS62840

    Electromagnetic noise is any type of unwanted electromagnetic energy that contains sufficient intensity to distort a signal. When designing high-performance data-acquisition applications or any system with particularly sensitive signal paths, noise is therefore the opponent to beat.

    On the power-supply side, high-efficiency DC/DC converters can be significant sources of noise due…

  • Skip automotive camera module power circuit redesign with scalable PMICs

    Other Parts Discussed in Post: TPS650330-Q1

    Automotive camera module designers have to balance reducing time to market while creating ever-smaller camera module designs that are scalable and reusable for various types of image serializers and sensors. In this article, I will address several key design challenges for automotive camera module designs, including design simplification and platform scalability.

    Simplify design…

  • SoC power design: 3 steps to a thermally optimized power supply

    Other Parts Discussed in Post: TPS546D24A

    This year marks the 35th anniversary of the Applied Power Electronics Conference (APEC). It’s a perfect reason to take a trip down memory lane when it comes to power-supply design for system-on-chip (SoC) applications, such as communication base stations, test and measurement equipment or data centers.

    While designing thermally optimized power supplies has never been an easy…