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

    Power Tips: How to set up a frequency response analyzer for Bode plot

    Loop gain is an important parameter for characterizing a switch-mode power supply. Using a frequency analyzer to measure loop gain gives you a way to stabilize the power supply and optimize transient response. Before measuring the Bode plot, you need to first break the loop and insert a small resistor at the breaking point, as shown in Figure 1....
    • Sep 4, 2015

    Designing a power supply solution for pipeline ADCs – Part 2

    In part 1 of this series , I demonstrated the impact of a DC/DC converter on the signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR) of a pipeline analog-to-digital converter (ADC). In part 2, I will use the analysis from my previous posts to implement a real-world power-supply solution that will minimize SNR and SFDR degradation while...
    • Sep 3, 2015

    Designing a power supply solution for pipeline ADCs – Part 1

    In my previous posts , I’ve discussed designing a real-world power supply. Now, let’s use what we know about the analog-to-digital converter (ADC) power-supply rejection (PSR) and signal-to-noise ratio (SNR), coupled with the DC/DC convert...
    • Sep 2, 2015

    Avoid noise pollution in Hi-Fi systems with low-noise power supply

    High-fidelity (Hi-Fi) audio is a combination pure and harmonic sounds, so captivating that the listener is transported to a higher level of bliss and happiness. Thanks to technological advances the Hi-Fi experience is becoming widely available in por...
    • Sep 1, 2015

    Designing a digital power supply: How to write firmware

    In part 1 of this blog series , I talked about how to design a digital power supply using Texas Instruments' UCD3138 as an example and focusing on the hardware design. In this installment, I’ll explain how to write firmware to make it work. Firmware Unlike analog power-converter design, which controls everything by hardware, the firmware...
    • Aug 31, 2015

    What is behind isolated DC/DC converter voltage regulation?

    Power supply designers often use isolated DC/DC converters to realize galvanic isolation, meet safety requirements and enhance noise immunity. When designing an isolated DC/DC converter, output voltage regulation accuracy is one of many design object...
    • Aug 31, 2015

    Power Tips: What’s the best way to drive synchronous rectifiers in a flyback supply?

    There are numerous techniques for driving synchronous rectifiers (SRs) in a flyback topology: using a gate-drive transformer, having the power transformer self-drive the SR, or using a specialized driver. The gate-drive transformer and self-driven techniques result in less-than-optimal efficiency due to either shoot-through or reverse-recovery losses...
    • Aug 29, 2015

    Designing for isolated DC/DC converter shunt safety

    Did you know that your shunt regulator is in danger? No? Don’t worry – the fix is free. Free is good. A very common feedback circuit used in isolated DC-to-DC converter applications uses a shunt regulator such as the ATL431 and an optical...
    • Aug 27, 2015

    Overview of voltage regulator packaging

    As more and more features are packed into industrial and automotive electronic systems, smaller, robust packages become even more attractive. However, to ensure that the electronic design is thermally robust, you need to have a proper understan...
    • Aug 26, 2015

    Get into electromagnetic compliance with GaN

    Gallium nitride (GaN) transistors switch fast! In a previous post , I examined the LMG5200 half-bridge GaN driver, and showed that it is capable of a switching rise time of 600ps or less. On the bench, I measured a switch-node dv/dt of 40V per nanosec...