Product category:
Power Supplies and Uninterruptible Power Supplies
News Release from: Emerson Network Power - Embedded Power | Subject: EXQ125 series DC/DC converter modules
Edited by the Engineeringtalk Editorial
Team on 24 July 2001
DC/DC converter power density sets new
standard
The latest additions to Artesyn Technologies' rapidly expanding range of high-efficiency quarter-brick DC/DC converter modules produce up to 83W of output power.
The latest additions to Artesyn Technologies' rapidly expanding range of high-efficiency quarter-brick DC/DC converter modules produce up to 83W of output power Measuring just 2.28 x 1.45 x 0.5 inches, the new EXQ125 series converters have a power density of more than 50W/in3, which is a figure that sets a new standard for the industry
The converters are designed specifically to meet the growing demand for low voltage, high current sources for powering latest-generation semiconductor technology, and are initially available with 3.3V, 2.5V or 1.8V outputs.
All three models are capable of producing exceptionally high current output levels; the 2.5V and 1.8V units can deliver up to 30A, and the 3.3V unit can deliver up to 25A.
The converters feature a wide input voltage range of 33V to 75V and are particularly suitable for systems employing a 48V distributed power architecture, including any that operate from a -48V central office battery plant.
Artesyn's EXQ125 series DC/DC converters use a technique known as synchronous rectification to achieve extremely high conversion efficiencies; the 3.3V model, for example, has a typical efficiency of 91%.
The converters' open frame construction means that there are no thermally conductive potting compounds between power dissipating components and heat-sensitive control circuits, and a novel two-board stacked structure is employed to further thermally de-couple these two areas.
The baseplate board containing the synchronous rectifiers is a two-layer thermally conductive substrate laminated to an aluminium plate.
The overall result is a high reliability design that has a wide operational temperature range, spanning from -40sC ambient up to +100sC baseplate temperature.
Designed for fully-automated assembly, EXQ125 series converters are constructed entirely from SMT components, and have a standard quarter-brick footprint.
In fact, the converters are pin-for-pin compatible with a number of leading competitive products - which makes them ideal for manufacturers seeking a second source option - but are capable of delivering more usable power under low airflow or natural convection conditions than any comparable DC/DC converter on the market today.
All EXQ125 series converters offer an output voltage trim facility that enables the output to be adjusted between 90% and 110% of nominal.
This is a particularly useful feature for systems designers who wish to perform margin testing by varying supply voltages, and it also allows standard off-the-shelf DC/DC converters to be used in applications involving highly specific voltage requirements, which would previously have demanded expensive customised power sources.
All three converters in the series also offer remote on/off facility.
The converters have no minimum load requirement, and are comprehensively protected against over-voltage, over-temperature and short-circuit conditions.
A combination of non-latching clamping over-voltage protection and a brick wall current limit characteristic are employed to help maximise system uptime, by ensuring that the converter will continue to deliver power even when in failure mode.
Artesyn's EXQ125 series DC/DC converters have a 1500VDC isolation rating and carry a full set of international safety approvals, including EN60950 (TUV Rheinland) and UL/cUL1950.
The converters are designed to meet all relevant standards for use in telecommunications equipment, including ETS 300-019 for environmental protection, ETS 300-132-2 for maximum inrush current and supply voltage rise time, and ETS 300-386-1 for EMC issues.
With the addition of a small number of external filtering components, EXQ125 series converters can meet the EN55022 level A and level B standards for conducted noise emissions.
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