Smart pixel adjust power supply up for voltage loss
For a conventional buck or boost converter, References 4, 5, and 6 demonstrate several methods to adjust the output voltage. Next, let’s examine dynamic voltage adjustment. This application report also includes some level-shifting circuit examples.
#SMART PIXEL ADJUST POWER SUPPLY UP FOR VOLTAGE LOSS HOW TO#
The report also includes useful suggestions on how to test the circuit by measuring Bode plots and load transient response. This TI application report does a great job explaining several circuits that level shift the enable (EN), power good (PGOOD), and synchronization (SYNC) signals between the system ground (0V) domain and the local IC ground (-V OUT) domain. The input/output (I/O) pins are referenced to the negative output voltage (-V OUT) instead of to system ground (0V). 【Webinar】Get started on your AI learning todayĪ key challenge with generating a negative voltage using a buck converter IC is how to interface and level-shift signals to and from the IC. The resistor divider from the output to the feedback (FB) pin sets the output voltage.įigure 1 Operating a buck converter as an inverting buck-boost converter generates a negative output voltage. The buck converter integrated circuit (IC) ground pins connect to the negative output voltage node (-V OUT) and the inductor output connects to system ground (0V). One common approach to creating a negative power rail is to use a conventional buck converter but operate it as an inverting buck-boost converter (References 1-3). The missing link that I hope to address in this article combines both techniques with a simple level-shifting circuit.Īpplications that require power supplies with negative output voltages include test and measurement, aerospace and defense, automotive, and medical. There are standard techniques to generate negative output voltages, and there are well-known approaches to dynamically adjust an output voltage. This power tip delves into the challenge of dynamically adjusting a negative output voltage.