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.
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