Product category:
DC/DC Convertors
News Release from: Emerson Network Power - Embedded Power | Subject: RFF series
Edited by the Electronicstalk Editorial
Team on 19 December 2005
Full-brick convertors power wireless
basestations
A series of high-efficiency full-brick isolated DC/DC convertors is designed specifically for use with RF power amplifiers and similar telecomms equipment.
Artesyn Technologies has launched a series of high-efficiency full-brick isolated DC/DC convertors designed specifically for use with RF (radio frequency) power amplifiers and similar telecomms equipment The new RFF series of convertors comprises five 28V output models, offering a choice of two input voltage ranges and three output current ratings for optimal applications flexibility
This article was originally published on Electronicstalk on 4 Feb 2000 at 8.00am (UK)
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All five models feature high power output capabilities and are rated for continuous operation across a wide temperature range, making them ideal for use with high availability equipment deployed in demanding outdoor environments, such as cellular basestations and last-mile broadband systems.
The top of the range RFF700 model is capable of delivering 25A at 28V (700W), yielding a power density in excess of 7.7W/cm3.
RFF series full-brick convertors are primarily intended for generating the regulated intermediate bus voltage in telecom systems that use a distributed power architecture.
Further reading
Artesyn extands 24V DC/DC range to 30A
Artesyn Technologies has added a new member to its BXB family of industry standard, half-brick DC/DC converters.
New standard in efficiency from DC/DC Converters
Artesyn Technologies has introduced the EXB30 series of high-efficiency, single-output, open-frame, isolated DC/DC converters.
Artesyn releases 2000 Power Supply Handbook
Comprehensive catalogue features wide range of new AC/DC and DC/DC products.
All five modules produce a nominal 28V DC output, which can be adjusted over the range 16.8 to 29.4V via a single resistor or a suitable control voltage.
The RFF500 and RFF600 have output current capabilities of 17.9 and 21.4A, respectively, and both models are available with a choice of 24V nominal (18 to 36V) or 48V nominal (36 to 75V) inputs.
The RFF700 handles output currents of up to 25A and has a nominal 48V (36 to 75V) input.
All RFF series convertors also feature a low voltage (7 to 10V DC) auxiliary output, which can supply up to 20mA for power control signalling purposes.
A key advantage of RFF series convertors is that they can be connected in parallel for high current applications and will automatically share load current, without the need for any additional circuitry.
As many as 11 convertors can be connected in this manner, and by adjusting their output voltages to within 1%, users can obtain up to 95% rated current from each unit.
This enables extremely high power 28V DC sources to be configured very easily and cost-effectively.
Simply by paralleling RFF700 models, for example, users can implement a power supply capable of delivering more than 260A - equating to 7.3kW of fully regulated power.
RFF series full-brick convertors are based on an advanced single forward topology, using ultrafast recovery output diodes and a high fixed switching frequency of 1MHz, to provide conversion efficiencies of up to 91% at full load.
This minimises internal power dissipation, which simplifies thermal management and contributes to the convertors' excellent reliability.
Feedback isolation is achieved without the use of optocouplers, which helps maximise bandwidth to ensure excellent transient response and regulation characteristics.
All five convertors maintain line and load regulation to within +/-0.54% and +/-0.2%, respectively.
The convertors have an industry-standard full-brick pin-out and footprint of 117 x 61mm, and an above-board height of 130mm.
They are packaged as fully encapsulated units intended for through-hole board mounting and incorporate aluminium baseplate technology for conduction cooling.
Various heatsink attachment methods are available, and the modules can be supplied with threaded or blank inserts to suit customers' preferences.
Artesyn's RFF series convertors have no minimum load requirement and can operate over an exceptionally wide baseplate temperature range of -40 to +100C.
Differential remote sense and positive logic remote on/off facilities are provided as standard, with negative logic remote on/off available as an option.
An "inverter operation good" output signal is also provided to indicate normal or abnormal behaviour.
The convertors are fully protected against input under/overvoltage, output overvoltage, overcurrent and short-circuit conditions, and feature overtemperature shutdown with auto-restart.
RFF series convertors carry a full set of international safety approvals - including EN60950 VDE, UL/cUL60950 and an IECEE CB Scheme test certificate and report - to help customers reduce system compliance costs and accelerate time to market.
The convertors are compliant with the RoHS Directive EU 2002/95/EC and intended for telecomms, server, storage and other applications that will continue to use lead solder.
Artesyn's RFF500/600/700 series full-brick convertors are available for immediate delivery.
In OEM quantities of 1000, unit prices range from US $137.50 for the 500W, 24V-input model, to $181.50 for the 700W model.
Standard lead time on all models is stock to 12 weeks.
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