Product category:
DC/DC Convertors
News Release from: Emerson Network Power - Embedded Power | Subject: Typhoon "value" eighth-bricks
Edited by the Electronicstalk Editorial
Team on 02 April 2004
Budget models accelerate shrink to
eighth bricks
Five new low-cost 25/20A isolated eighth-brick DC/DC convertors are set to accelerate design migration from standard quarter-brick form factors.
Five new low-cost 25/20A isolated eighth-brick DC/DC convertors are set to accelerate design migration from standard quarter-brick form factors Known as "value" models, the new convertors are expressly designed for applications where cost sensitivity has - until now - precluded use of the latest-generation small form factor power convertor technology
This article was originally published on Electronicstalk on 4 Feb 2000 at 8.00am (UK)
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They offer designers a choice of 1.2, 1.5, 1.8, 2.5 and 3.3V outputs, and use the same ultra-high-efficiency topology as other eighth-brick convertors in Artesyn's industry-leading Typhoon product family.
The 3.3V model, for example, has a typical conversion efficiency of 91% when delivering its full 20A (66W) output.
All Artesyn Typhoon eighth-bricks, including the new cost-optimised "value" models, use a patented full-wave coupled inductor topology.
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Advanced processor-based primary- and secondary-side control techniques, combined with precision timing of the synchronous rectifiers, are employed to maximise efficiency.
The topology also eliminates the need for optocouplers, maximising reliability and ensuring that the convertors provide exceptionally fast transient response capabilities.
The output voltage of each of the five value models typically only deviates by 70mV during a 25% step change in load current at rates up to 1A/us, and completely recovers within 20us.
All five value models feature a wide input voltage range of 36 to 75V DC, making them ideal for use with telecomms-standard 48V supplies, and are fully protected against input voltage transients of up to 100V for 100ms.
The convertors' outputs can be adjusted from 80 to 110% of nominal, using a single voltage trim resistor.
Design-in flexibility is further enhanced by the fact that the convertors have no minimum load requirement, and provide a true monotonic startup characteristic under both normal and prebiased load conditions.
The convertors feature remote sense and remote on/off facilities as standard, and have a typical startup time of 10ms when driving a resistive load.
In common with all Typhoon eighth-brick convertors, the "value" models have an industry-standard 22.9 x 58.4mm footprint, which is 38% less than conventional quarter bricks, and are based on an open-frame, single-board package designed for through-hole mounting.
The pinout is identical to standard quarter-brick convertors, enabling drop-in replacement.
Extensive use of surface-mount components and planar, in-the-board transformer structures helps minimise profile, allowing the installed height to be kept to just 7.6mm.
This exceptionally low profile means that the convertors are suitable for applications involving very tight interboard spacing, such as latest-generation telecomms switches and high-end servers.
Artesyn's eighth-brick "value" models are specified for operation over the ambient temperature range of -40 to +85C and can supply full usable power without a heatsink; no derating is required down to 100 litre/min of airflow.
The convertors feature undervoltage lockout, as well as nonlatching overvoltage protection, and are also protected against short-circuit and overtemperature conditions, with automatic recovery.
The convertors carry a full set of international safety approvals, including EN60950 VDE and UL/cUL60950.
The introduction of the latest "value" models expands Artesyn's Typhoon family of conventional DC/DC brick convertors to a total of 27 different base models; 10 eighth-bricks, eight single-output quarter bricks and nine dual-output quarter bricks.
They provide designers with considerable freedom of choice for migrating from lower performance older generation quarter and half-bricks.
Sample quantities of Artesyn's low-cost eighth-brick convertors are available for immediate delivery, and the standard lead-time for quantity orders is stock to 12 weeks.
Priced at $49.50 US in OEM quantities of 1000, Artesyn's "value" models are believed to be the most efficient and lowest cost eighth-brick convertors in their power range on the market today.
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