Powerbox releases 105 DC/DC converters with medical approvals

Over 100 models of DC/DC converters have been announced by Powerbox. There are 105 models in three series of 15W, 20W and 30W board-mount DC/DC converters for medical applications.

The PMM15, PMM20 and PMM30 are certified to the 3rd edition of the IEC/EN/ANSI/AAMI ES 60601-1 medical safety standard and rated for the highest levels of patient protection – 2xMOPP (means of patient protection). The converters have a clearance and creepage distance of 8mm, a typical leakage current of two microA and a 5,000V AC isolation voltage. All models are available in 2:1 and 4:1 input versions covering 9.0 to 75V input voltage and provide seven different output voltages from 5.0 to ±15V. The power converters are covered by a five year warranty.

The PMM15, PMM20 and PMM30 can be used in countries such as China or those in South America, which are bringing healthcare to populations based in mountainous regions. It is very common in those countries for healthcare centres and hospitals to be located at altitudes higher than 3,000m. Medical equipment must be designed to guarantee the highest level of safety up to 5,000m. Powerbox’s PMM15, PMM20 and PMM30 have been designed for this and they also comply with the Chinese Safety Standard GB 4943.1-2011 requirement for operation at altitude.

The PMM15, PMM20 and PMM30 wide input (2:1) units are available in three input voltage ranges, 9.0 to 18V, 18 to 36V and 36 to 75V, and the 4:1 input versions are available in two input voltage, 9.0 to 36V and 18 to 75V. All models are fully regulated with a complete range of output voltages comprising 5.0, 12, 15, 24, ±5V, ±12V and ±15V.

No minimum load is required and tight regulation from no load to full load of ±0.2 per cent on single output, and ±0.5 per cent on dual output is provided.

The PMM15, PMM20 and PMM30 have an efficiency up 90 per cent and can be operated within an ambient temperature of -40 to +105 degrees C. In the case of natural convection a derating may apply. In cases of excess of heat, an internal over-temperature protection is set at +115 degrees C case.

The PMM15, PMM20 and PMM30 include over-voltage, under-voltage, over-load and short circuit, and thermal-shutdown protection.

The DC/DC converters are supplied in a non-conductive black plastic housing and potted with a UL94-V0 silicon compound. The PMM15 and PMM20 measures 40.6 x 25.4 x 10.2mm (1.6 x 1 x 0.4-inch) and weigh 24g. The PMM30 is available in a 50.8 x 25.4 x 10.2mm (2.0 x 1.0 x 0.4-inch) housing and weighs 32g.

Without using external components, the PMM15, PMM20 and PMM30 meet EMI levels as specified by EN55011, EN55032 and FCC Part 18, Class A.

According to the MIL-HDBK-217F, at full load and +25 degrees C, the PMM15, PMM20 have an MTBF of two million hours, and the PMM30 of 1.1 million hours.

An optional remote control pin (P) for positive logic and (N) for negative logic is available to externally control on/off. All single output voltage modules can be externally adjusted up and down by adding a resistor bridge connected to the trimming pin.

The PMM15, PMM20 and PMM30 are suitable for a medical applications such as home healthcare auxiliary equipment, ultrasound, assisted ventilation, infusion pumps, dental chair and supervisory systems and many others. In industrial applications, the 5,000V AC reinforced isolation figure can be used as an inexpensive way to add an IGBT drive channel to any industrial power supply, meeting the safety requirement required by such applications.

All products conform to the European directive RoHS, REACH and are CE marked.


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