MTM Power Messtechnik Mellenbach GmbH, the specialist for individual power supplies, has designed a new generation of DC/DC converters: the series PMDS/PCMDS60W. They can especially used in automotive applications. These primary switched DC/DC converters are available with an output power of 60W and operate according to the push-pull principle, i.e. the input dc-voltage is chopped by two push-pull working transistors with a frequency of approx. 70kHz.

With the help of a transformer and a secondary linear choke, a galvanically isolated output voltage (5,2V, 12V or 24V) is produced which is adjusted by pulse-width modulation according to the current mode principle. The converters are available with a wide input range for battery voltages of 24V, 36V, 72V, 96V and 110V acc. ENO 50 155. The dimensions are 130mm x 69mm x 30mm (length x wide x height).

Because of this flat design, they are also suitable for applications where only little space is available. They are connected via inptut/output flying leads (PMDS) or spring clamps (PCMDS), which meet the special requirements e.g. in railway applications as regards to vibration resistance and reduced time for wiring. The converters need no ground load, are maintenance free and short-circuit protected by primary and secondary power limitation. They are vacuum potted, prepared for use in devices with Protection Class II and fulfill the low voltage directive. Further features are a mechanically and electrically rugged design using SMD-technology and an automatic piece-by-piece test.