Occasionally, a project may require a positive power supply, even though the most available rail is negative. This article presents a simple, efficient circuit for the generation of a positive voltage from a negative rail.
The voltage conversion solution from Analog Devices detailed in this article is reliant on a few common components, used in a boost topology setup. The power train includes switching MOSFETs, bottom Q1, top Q2, inductor L1, and input/output filters. A synchronous high-efficiency boost controller IC regulates the output voltage by changing the state of the switching MOSFETs in the power train.
The converter works as follows: If transistor Q1 is on, then current flows from the SYS_GND to the negative rail. The transistor Q2 is off and inductor L1 stores energy in its magnetic field. To complete the switching period, Q1 turns off, and Q2 turns on.
See related product
See related product
See related product
See related product