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105 DC-DC converters for medical designs

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By Nick Flaherty

Three new series of 15W, 20W and 30W board mount DC-DC converters have reinforced isolation of 5,000VAC with two means of patient protection (2xMOPP) and low leakage current of 2µA. The converters have 2:1 and 4:1 input voltage ranges covering from 9V to 75V and outputs from 5V to +/-15V.

The PMM15, PMM20 and PMM30 are certified to the 3rd Edition of the IEC/EN/ANSI/AAMI ES 60601-1 medical safety standard and EMI levels as specified by EN55011, EN55032 and FCC Part 18, Class A without using external components and rated for the highest levels of patient protection at 2xMOPP. With a clearance and creepage distance of 8mm, the modules ensure operator and patient safety and protection in medical applications. The DC-DC converters are all covered by 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 3,000 meters. Medical equipment must be designed to guarantee the highest level of safety up to 5,000 meters. The 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, 9-18V, 18-36V, 36-75V, and the ultra-wide input (4:1) versions in two input voltage, 9-36V and 18-75V. All models are fully regulated with a complete range of output voltages comprising 5V, 12V, 15V, 24V, +/-5V, +/-12V and +/-15V. 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.

The DC-DC converters have an efficiency up 90% and can be operated within an ambient temperature of -40 to +105 ºC. 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 ºC case. According to the MIL-HDBK-217F, at full load and +25 ºC, 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.

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 in) and weigh 24 grams. The PMM30 is available in a 50.8 x 25.4 x 10.2 mm (2.0 x 1.0 x 0.4 in) housing and weighs 32 grams. THe DC-DC converters are aimed at 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 5,000VAC reinforced isolation figure allows designers to add an IGBT high power drive channel to any industrial power supply, meeting the safety requirement required by such applications.

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

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

www.prbx.com

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