Technical solutions, industry trends and insights for designing and managing power supplies.
    • Nov 17, 2017

    Essential linear charger features

    As electronic devices become smarter with more built-in features, they become more attractive but also more power-hungry, making rechargeable batteries an obvious economical choice. Charger requirements have evolved in recent years, with innovative a...
    • Nov 17, 2017

    “Peak current-mode control” in an LLC converter

    In 1978, when Cecil Deisch worked on a push-pull converter, he faced a problem of how to balance the flux in the transformer and keep the core from walking away into saturation caused by slightly asymmetrical pulse-width modulation (PWM) waveforms. He came up with a solution of adding an inner-current loop to the voltage loop and let the switch turn...
    • Nov 15, 2017

    The D-CAP+™ Modulator: Evaluating the small-signal robustness

    In a previous Power House blog post , I introduced TI’s D-CAP+ multiphase regulator control topology and covered the basics of its architecture, steady-state operation and transient performance versus a competitor’s part. I also said something when listing some of the features of the D-CAP+ control topology that at first glance just seems...
    • Nov 14, 2017

    How to minimize undershoot when the pre-boost converter wakes up

    The start-stop system in hybrid electric vehicles (HEVs) helps reduce fuel consumption and emissions by stopping the engine during idling, but the battery voltage drops whenever the engine restarts. To provide the minimum required voltage to the loads during the battery voltage drop, pre-boost converters are widely used in automobiles. Table 1 shows...
    • Nov 13, 2017

    FPGA power made simple: sequencing

    I hope you enjoyed the last blog on rail requirements. Now we move on to sequencing, another important topic in field-programmable gate array (FPGA) power design. While powering the FPGA on and off, the power supplies need to turn on in a particular order. The exact sequencing series will vary, but typically the core rail is the first on and the first...
    • Nov 9, 2017

    Improve the user experience with an LED ring

    Products with good user experience can always receive positive feedback in the market. You can use audible, visual or tactile methods to improve the user experience for consumer electronics or smart home products like speakers, locks, smoke detectors...
    • Nov 8, 2017

    An introduction to the D-CAP+™ modulator and its real world performance

    The D-CAP+™ control architecture is optimized for multiphase regulators. Like the standard D-CAP™ control scheme, the D-CAP+ architecture is also a constant on-time architecture, but it’s implemented using a true current-mode design. This enables it to properly sense and balance inductor current between multiple phases of a switching...
    • Nov 7, 2017

    How to ensure precision in automated processes

    Precision in factory automation applications depends on many factors, such as accuracy, temperature drift, and noise. But there are two more key factors that you may have overlooked when initially designing a system: safety and repeat-ability. In ord...
    • Nov 6, 2017

    FPGA power made simple: rail requirements

    In the first installment of this series, I reviewed the system architecture choices for a field-programmable gate array (FPGA) power design and how to estimate the power requirements. Now that you have a good idea from the vendor’s spreadsheet what the voltage and current requirement of each individual rail is, you need to look at the requirements...
    • Nov 3, 2017

    How to design a simple two-phase current-sharing synchronous buck regulator using a voltage-mode controller

    I’m often asked, “Can you tie the outputs of two voltage-mode buck controllers together, and will the currents in each phase share evenly?” Many experienced designers know that it’s often easier to implement current sharing wi...