Isolated & Non-Isolated DC-DC Converters

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There are two often used phrases for forms of DC-DC converters; non-isolated and remoted. This “isolation” refers back to the existence of barrier between the enter and output of the DC-DC converter.

The only instance of a non remoted “converter” is the favored LM317 three terminal linear regulator. One terminal for unregulated enter, one for the regulated output and one for the widespread.

Source Nationwide Semiconductor

Word there is no such thing as a isolation between the enter and output.

At this time, non-isolated switching regulators are quite common, or Level of Load (POL) converters.

Though low value and easy, these converters undergo from one drawback in that there's connection between the enter and output. Many security company our bodies and/or clients require a separation from the utilized enter voltage and the output voltage which is usually consumer accessible.

An remoted DC-DC converter may have a high frequency transformer offering that barrier. This barrier can face up to something from a couple of hundred volts to a number of thousand volts, as is required for medical application.

A second benefit of an remoted converter is that the output will be configured to be both optimistic or adverse.

The place many customers get confused issues methods to join the enter up, significantly with the variations between a datacom system (enter adverse related to chassis) and a telecom system (enter optimistic related to chassis).

Beneath are 4 situations, remember - figures 3 & 4 will lead to failed converters! Most DC-DC converters can not face up to reversed enter connections.