Product category:
Power Supplies and Uninterruptible Power Supplies
News Release from: Emerson Network Power - Embedded Power | Subject: EXB250 series DC/DC converters
Edited by the Engineeringtalk Editorial
Team on 07 June 2001
Efficient DC/DC converters deliver to
60A at 1.8V
Artesyn Technologies has launched an entirely new series of DC/DC converters to meet the growing demand for high-current, low voltage sources for powering latest-generation semiconductor technology.
Artesyn Technologies has launched an entirely new series of DC/DC converters to meet the growing demand for high-current, low voltage sources for powering latest-generation semiconductor technology Housed in an open frame package with an industry-standard half-brick footprint, the new EXB250 series converters feature a wide 33V-75V input and are initially available with 3.3V, 2.5V or 1.8V outputs
All three models offer exceptionally high current output capabilities for their size - the 2.5V and 1.8V models can deliver up to 60A.
The converters are primarily targeted at networking, telecoms and wireless applications, and are particularly suitable for systems employing a 48V distributed power architecture, including any that operate from a -48V central office battery plant.
EXB250 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 90% and can deliver up to 165W of output power.
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, EXB250 series converters are constructed entirely from SMT components, and have a standard half-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 EXB250 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 sense capabilities to compensate for distribution losses, and are equipped with a 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 EXB250 series DC/DC converters have a 1500VDC isolation rating and carry a full set of international safety approvals, including EN60950 and UL1950.
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, EXB250 series converters can meet the EN55022 level A and level B standards for conducted noise emissions.
EXB250 series DC/DC converters are available to OEMs for $85.67, when ordered in quantities of 10,000.
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