Technical solutions, industry trends and insights for designing and managing power supplies.
    • Mar 5, 2015

    Simplifying higher current split-rail designs with Fly-Buck converters

    Since 2011 TI has recommended using the Fly-Buck ™ topology (or isolated buck topology) to simplify isolated bias designs for industrial and communication applications. The Fly-Buck design adds coupled windings to the inductor to provide single ...
    • Mar 3, 2015

    Using a DC/DC converter to power an ADC

    In my previous blog, “ Measuring PSR in an ADC ”, I developed a complete PSR characterization procedure for a pipeline analog-to-digital converter (ADC) with low voltage differential signaling (LVDS) output and the methodology necessary to...
    • Mar 1, 2015

    Power Tips: How to measure frequency response in isolated supplies

    Do you dread compensating the feedback loop of your isolated power supplies? Where you choose to break the loop for your measurement will affect the difficulty of your task. In Power Tip 76, we discussed how to easily select the compensation components around a TL431 circuit. While employing the equations in this Power Tip, it is crucial that you...
    • Feb 26, 2015

    Knock out the noise! Create a cleaner PLC design

    Used in factory automation, programmable logic controllers (PLCs) are basic necessities of any industrial automation design. Simply put, they are industrial computers specialized to control machines and processes and are designed to work in rugged industrial environments. Programmable Logic Controllers PLCs come in all shapes and sizes but can...
    • Feb 24, 2015

    Power Tips: Designing a two-stage LC filter

    Many applications require low-noise power supplies, including laser-diode drivers and optical modules. Even with low equivalent series resistance (ESR) ceramic output capacitors, it is often impractical to use a traditional single-stage inductor-capacitor (LC) filter to power such loads. Designers may be forced to use a two-stage LC filter in order...
    • Feb 21, 2015

    How to get more out of your sensor with the right LDO

    In a recently released white paper, “ Powering sensors with LDOs for industrial process control ,” I reviewed important design requirements for low-dropout regulators (LDOs) used in industrial process control sensors. The paper examined the...
    • Feb 19, 2015

    Power Tips: Solar panel lighting requires a system-level approach

    Going green isn't always quite as simple as it seems; for example, take a system designed to store solar energy in a battery to power light-emitting diodes (LEDs) at night. As you can see from the block diagram (Figure 1), this system involves mu...
    • Feb 18, 2015

    ADC power-supply rejection, calculating allowed supply ripple

    In my previous blog, “ Measuring PSRR in an ADC ,” I looked at the methodology and techniques needed to measure the power-supply rejection ratio (PSRR). In this blog post, we’ll finish the analog-to-digital converter (ADC) characteriz...
    • Feb 14, 2015

    Increase voltage tolerance and accuracy in FPGAs

    Advanced processors and FPGAs are becoming more sophisticated and powerful. At the moment, there are new FPGAs using process nodes as small as 20 micrometers! As semiconductor process technology advances, the core voltage decreases and th...
    • Feb 12, 2015

    Implementing transition-mode control using UCD3138 devices

    A while ago, I was asked to examine the feasibility of generating closed-loop control waveforms needed for operation in transition mode using the TI UCD3138 controller. These digital controllers are very flexible and equipped with a lot of bells and ...