Isolated low noise DC/DC converters of high efficiency

31st October 2017

Posted By Paul Boughton

For noise sensitive applications, switching regulators tend to be ruled out due to the disturbing output ripple and noise.

Linear regulators win over a smoothed output voltage but they work inefficient and produce a lot of heat.

If the circuit has to be isolated, linear regulators are out of question.

The power supply of a noise sensitive application calls for a compromise in performance or it requires an expensive filtering.

With the TVN 3 and TVN 5WI series Traco Power merges the advantages of switch mode DC/DC converters and linear regulators.

These 3 Watt and 5 Watt switch mode DC/DC converters have a functional insulation system that provides an I/O-isolation voltage of 1600 VDC.

The output voltage is fully regulated (line/load) and filtered for a residual ripple and noise of 10 mVp-p typ. It can even be reduced to 5 mVp-p by a single external 10 µF capacitor.

The expenses for an external filtering can be kept down. With an efficiency of 80-89% (depending on model and operating point) the heat dissipation is very low.

The low thermal losses have a direct positive impact to the lifetime and reliability not only for the DC/DC converter but also for the components around it.

The TVN 3 and TVN 5WI converters enable a cost efficient high performance solution for analogue circuits and for applications in instrumentation, audio and video, wireless communication, medical instruments, data acquisition systems, etc.

The 5 Watt converters of  TVN 5WI series come in a six side shielded DIP-24 metal package and have an internal input filter to comply with conducted noise level EN 55032 class B. Standard features include remote On/Off, over voltage protection, under voltage shut down and short circuit protection.

Models are selectable with output voltages of 3.3, 5.0, 12, 15, 24, ±5.0, ±12, ±15, ±24 VDC while the voltage of the single output models can be adjusted with an external resistor to -10% to +20% of nominal.

They are available with ultra-wide input ranges of 4.5 – 12 VDC, 9 – 36 VDC or 18 – 75 VDC. The 3 Watt converters of TVN 3 series come in a compact SIP-8 metal package.

Models are selectable with fixed output voltages of 3.3, 5.0, 9.0,12, 15, 24, ±5.0, ±12, ±15 VDC and they are available with wide input ranges of 4.5 – 13.5 VDC, 9 - 18 VDC, 18 – 36 VDC or 36 – 75 VDC.





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