Artesyn Technologies has launched a new high efficiency dual-output DC/DC converter module that employs synchronous rectification techniques and features an exceptionally wide trim range for each output. The EXB50 module is believed to be one of the first half-brick, dual-output products on the market to employ this latest-generation power conversion technology, and Artesyn has applied for patents on the circuit design. The EXB50 has a power output rating of 50 W continuous and provides two independent positive outputs; these are nominally set to +3,3 V or +5 V prior to shipment to suit customers' requirements, but each output can be trimmed from 1,5 V to 5,2 V. This ultra-wide trim range gives system designers unprecedented flexibility in power resource allocation, and should often enable them to use a single module where they would previously have been forced to use two. It also means that the converter provides a very cost-effective solution for accommodating the general trend in the electronics industry of using lower-voltage silicon devices.
The EXB50 can deliver up to 7,5 A from either output, and up to 10 A in total, at temperatures of up to 70°C under natural convection. With some forced air and/or reduced ambient temperatures, the EXB50 can deliver up to 7,5 A from either output, and up to 15 A in total. Its wide input voltage range of 36 V to 75 V d.c. makes it particularly suitable for use in systems employing a 48 V distributed power architecture. The converter is primarily intended for the networking, telecoms and wireless markets, where small size, lower output voltages with higher currents, low profile and high efficiency are all key demands. Typical applications include high-end routers and switches, optical networking products, transmission systems and wireless basestations.
The EXB50 series are packaged as open-frame units in standard half-brick footprint of 6 x 5,8 cm, and are constructed entirely from SMT components - including planar magnetics - which help keep the height down to just 1 cm. The converters are designed for pin-through-hole mounting and have a typical efficiency of 89%, and a wide operational temperature range of -40°C to +100°C ambient (-40°C to +70°C under natural convection cooling), with de-rating.
The EXB50 offers a remote on/off facility, which allows for logic control of converter and sequencing of outputs. The converter has no minimum load requirement, and is comprehensively protected against over-voltage, over-temperature and short-circuit conditions. The latching over-voltage protection circuits track the outputs by 125%, even if they have been trimmed right down to their lowest level of 1,5 V. Artesyn's EXB50 series dual-output DC/DC converters have a 1500 V d.c. isolation rating and carry a full set of international safety approvals, including EN60950 and UL1950.
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