New Industry Products

TDK Releases Series of 4:1 Input DC-DC Converters Supplying 15, 20 or 30 Watts

October 04, 2020 by Gary Elinoff

The new devices feature 5k VAC isolation along with ICT safety and medical certification.

Aimed at critical medical and specialized industrial applications, TDK’s wide-ranging family of DC-DC converters work with input voltages ranging from 9 to 75 volts, with dual or single outputs, over a range of 5 to 24 volts.


Three new series of medically rated DC-DC converters from TDK. Image courtesy of TDK
Three new series of medically rated DC-DC converters from TDK. Image courtesy of TDK


The new devices are described as 4:1 inputs, which means that they can accept accept inputs over a four to one range. The two 4:1 ranges for these units are either 9 to 36 volts or 18 to 75 volts. This allows these power supplies to work with either of the mainstay 12V/24V or 24V/48V system voltages. 

All members of both series are certified to IEC 60601-1 (medical) and feature 2 x MOPP isolation. They are also certified to IEC 62368-1. The input to output isolation of 5,000 Vac, along with a touch current of less than 2.5 μA, makes the units appropriate for use in a wide range of medical and industrial applications. 

The way TDK amalgamates the new devices is by output capacity, with PXG-M series of featuring outputs of either 15 or 20 watts, while the PXD-M30 units supplies 30 watts.

The two new series of devices are notable for the wide range of input and output voltages offered, as well as for their three different power capacities.

Modified image courtesy of TDK
Modified image courtesy of TDK


More details on specific PXG-M15/20 and PXD-M30 models are provided by TDK


What is ICT Certification?

The IEC 62368-1 2nd Edition is the new standard for both ICT (information, communication and technology) equipment and AV (audio visual) equipment in both the US and the EU. It supersedes IEC 60950-1 for ICT equipment and IEC 60065 for AV equipment. 

It is a standard focused on hazards to people, and will go into effect on December 20, 2020. Compliance will be vital for manufacturers marketing medical equipment,


Important Features

Over-current protection is standard, hiccup mode at 150 to 185%. Over-voltage protection is provided by zener clamp at a typical 6.2, 15, 20 and 30 volts for 5, 12, 15, and 24 volt devices, respectively. Over-temperature shutdown occurs at 115 °C, typical.

The voltage outputs of the single output devices can be adjusted via a trim pin. The ranges are: for 5V, 4.5 -5.5V; for 12V, 10.8 – 13.2V; for 15V, 13.5 – 18V; for 24V 21.6 – 28.8V.

It is possible to utilize these DC-DC converters in series, but not in parallel.

Standby input current is 12 mA or less, making the devices viable candidates for battery powered equipment.

Positive or negative remote on and off as an available option. Maximum startup time is 60 ms.

For all units, the switching frequency is from 225 to 285 kHz


Primary Applications

  • Battery powered mobile devices
  • Industrial applications
  • Medical devices


Safety Certifications

  • IEC/EN 60601-1
  • ANSI/AAMI ES 60601-1
  • IEC/EN/UL/CSA 62368-1 


External EMI filtering is not required for compliance to EN 55011-A, EN 55032-A. 


Physical Considerations

Available in industry standard package sizes, the PXG-M series of 15 and 20 watt converters feature dimensions of 1.6 x 1 x 0.4 inches while the 30 watt PXD-M30 devices measure 2 x 1 x 0.4 inches.

For the PXD-M series, the typical weight is 32 grams, and 24 grams is typical for the PXG-M series.

Operating temperature range is -40 to +105°C. 

The units are RoHS compliant.