Framingham, Mass.—Artesyn says its series of very high efficiency Typhoon quarter-brick intermediate bus converters (IBCs) delivers up to 50 percent more useable power than the company's previous generation. Providing up to 450 watts, these single-output 12-volt models include the IBC38AQT (unregulated, 4:1 fixed-ratio input/output) for computing and two semi-regulated models with input voltage ranges optimized for telecom (IBC28AQW) and networking (IBC30AQS) to power multiple point-of-load (POL) converters.
The IBCs, operating at 400 kHz, all use an advanced full bridge conversion topology, with a primary side microprocessor supervising the PWM (pulse width modulated) controller. This topology also employs a so-called "driven synchronous system," in which all power switches are directly controlled by the PWM. This scheme, as compared to the traditional self-driven synchronous rectifier approach, is designed to provide much tighter timing control of the secondary side switches, resulting in higher efficiency and, in the case of the closed-loop, semi-regulated models, better output voltage regulation. These converters also feature a distributed power train that uses two power cores instead of one, which increases overall efficiency and improves thermal management and reliability by dispersing heat evenly across the entire module.
As for performance, the IBC38AQT, for example, with an efficiency of 95 percent and a power density in excess of 337 W/in3, delivers up to 150 watts more (37.5 amps at 12 volts from a 42-53 VDC input) than its quarter-brick predecessor. Load regulation is within ±1.5 percent from zero to full load. The two application-optimized quarter-brick IBCs, both with semi-regulated outputs, are designed primarily for boards that have an unregulated supply voltage or for powering high performance POL converters, which tend to require more tightly controlled input voltages than general-purpose models. The IBC28AQW features a wide industry-standard 36 to 75 VDC input for telecom applications, while the IBC30AQS has a 42 to 53 VDC input suitable for datacom applications. Both models have a setpoint accuracy ±0.25 percent. The IBC28AQW delivers up to 28 amps, while the IBC30AQS provides 30 amps. Either model can be paralleled. The IBC28AQW and IBC30AQS maintain output regulation to within ±2.0 percent for zero to maximum rated output; line regulation is ±1.0, and ±0.3 percent, respectively.
These open-frame, single-board IBCs are designed for through-hole board mounting. Users have a choice of two body heights and three pin lengths to accommodate different board layouts and thickness. Designed for fully automated assembly to help reduce manufacturing costs, the modules are constructed entirely from surface-mount components, using planar transformers to minimize profile. The low-profile versions have an installed height of just 0.40 inch. All three models are designed for operation over a -40 to +85°C without a heatsink, and are suitable for both convection cooled and forced air environments. They are comprehensively protected against over-temperature and short-circuit conditions, and also feature non-latching over-voltage protection and input under-voltage lockout.
The IBCs carry a full set of international safety approvals, including UL/cUL60950-1 and EN60950-1 VDE. They also meet the EN61000-4-6 EMC standard for conducted emissions and the telecom-standard input transient rating of 100 volts for 100 ms. Input-to-output isolation is 1,500 VDC. They require no minimum load capacitance for stable operation.
An overall product description as well as datasheets are available from http://www.artesyn.com/powergroup/new_ibc_launch.htm.
The quarter-bricks are priced at $62.70 each for the 37.5-amp fixed-ratio model, $65.90 for the 30-amp narrow-input model and $73.25 for the wide-input 28-amp model, all in 1k quantities. Standard lead time is stock to 8-10 weeks ARO.
Artesyn Technologies, 1-888-283-3122, www.artesyn.com