Info!! An Choice To Isolated Dc-Dc Converters

Traditionally when several voltages (5V to 24V) are required inwards a system, either a multiple output ability provide is used or a unmarried output “bulk” provide alongside isolated DC-DC converters.  For voltages lower than 5V (0.6 to 3.3V) the electronics manufacture has migrated to using multiple non-isolated DC-DC converters, oft referred to Point of Load or POLs to drive FPGAs powered from a double-decker voltage betwixt 5V to 12V.

With depression ability (typically less than 300W) dual, triple or quad requirements inwards the criterion voltages of 5V, 12V, 15V in addition to 24V, a unmarried AC-DC ability provide is used.  These are toll effective in addition to readily available.

For medium ability requirements (350W to 1500W), oft the selection is to move a modular ability provide similar TDK-Lambda’s NV, Vega or Alpha series.  As the term “modular” implies, they are seat together using pre-assembled modules in addition to are available alongside brusk lead-times.  All the outputs are conveniently seat into ane package.

TDK-Lambda’s Vega series

Another selection is to move a unmarried output AC-DC ability provide alongside board mountain isolated DC-DC converters to create additional outputs.  These readily available converters attain from some 10W to 60W, tin convey input voltages of 12V, 24V or 48V in addition to provide single, dual or triple outputs, alongside output voltages of 3.3V, 5V, 12V in addition to 15V.

TDK-Lambda’s CCG serial of 25mm x 25mm 30W isolated DC-DC converters

When the requirement is for a higher ability (100W or greater) second, 3rd or 4th output, the DC-DC converter selection becomes to a greater extent than express in addition to because of the ability involved, estrus dissipation is harder to manage.  Cost tin every bit good top an issue.  Utilizing technology developed from the depression voltage output Point of Load non-isolated converters, higher output voltage non-isolated converters are forthwith existence considered.

Without the constraints of input to output isolation, high surgery “buck” (step-down) converters alongside real high efficiencies tin move achieved.  With less waste matter heat, bundle sizes tin move minimized in addition to costs reduced.

TDK-Lambda’s i6A24014A033V, for illustration has the next specifications:

Input voltage:    +9 to 40Vdc

Output range:    +3.3 to 24Vdc

Output power:   Up to 250W

Output current:  Up to 14A

Efficiency:         Up to 98%

Package size:     33mm x 23mm

As a note, these types of (step-down) buck converters cannot provide a voltage higher than the input.

Although these types of converters take away maintain no input to output isolation, the AC-DC ability provide volition have, inwards accordance alongside the security standards IEC 60950 / 60601.

Below is a typical application using the i6A:

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