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    Electronicdesign 27313 Powerbox
    1. Technologies
    2. Power

    DC-DC Converter Models Achieve 2xMOPP Medical Approval

    June 10, 2019
    Powerbox’s dc-dc converters feature a typical leakage current of 2 µA and 5000-V ac isolation voltage.

    Powerbox has announced the introduction of three new series of 15-W, 20-W, and 30-W board mount dc-dc converters for demanding medical applications, totaling 105 models. The PMM15, PMM20, and PMM30 are certified to the third edition of the IEC/EN/ANSI/AAMI ES 60601-1 medical safety standard and rated for the highest levels of patient protection. They integrate a reinforced insulation with 2x MOPP.

    With a clearance and creepage distance of 8 mm, a typical leakage current of 2 µA and a 5000-V ac isolation voltage, the modules ensure operator and patient safety and protection in medical applications. For optimized efficiency and flexibility, all models are available in wide input (2:1) and ultra-wide input (4:1) versions covering an input voltage range of 9 V to 75 V, and providing seven different output voltages from 5 V to +/-15 V. The power converters come with a five-year warranty.

    Many countries such as China or those in South America are bringing healthcare to populations based in mountainous regions, and it is very common in those countries for healthcare centers and hospitals to be located at altitudes higher than 3000 m. Medical equipment must be designed to guarantee the highest level of safety up to 5000 m. 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, 9-18 V, 18-36 V, 36-75 V, and the ultra-wide input (4:1) versions in two input voltage ranges, 9-36 V and 18-75 V. All models are fully regulated with a complete range of output voltages comprising 5 V, 12 V, 15 V, 24 V, +/-5 V, +/-12 V, and +/-15 V.

    No minimum load is required and tight regulation from no load to full load of +/-0.2% on single output, and +/-0.5% on dual output is provided, according to the company.

    Designed around an optimized topology, the PMM15, PMM20, and PMM30 have an efficiency of up to 90% and can be operated within an ambient temperature of -40 to +105°C, claims the company. In the case of natural convection, a derating may apply. In cases of excess heat, an internal over-temperature protection is set at +115°C case.

    The PMM15, PMM20 and PMM30 include a number of protections including over-voltage, under-voltage, over-load and short circuit, and thermal-shutdown.

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

    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°C, the PMM15 and PMM20 have an MTBF of 2 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.

    According to the company, the PMM15, PMM20, and PMM30 are suitable for a large range of 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 5000-V ac reinforced isolation figure makes the PMM an ideal solution to add, at low cost, an IGBT drive channel to any industrial power supply, meeting the safety requirement required by such applications.

    The PMM family includes 6 series, 3-W PMM03; 6-W PMM06; 10-W PMM10; 15-W PMM15; 20-W PMM20; and 30-W PMM30.

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

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