Power converter offers efficiencies of 96 percent at 12-V output

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By Field Editor

Compatible with the DOSA (Distributed-power Open Standards Alliance) 5-pin eighth-brick footprint standard and offering an input range from 36 V to 75 V, the PKB4313D advanced bus converter is ideal for intermediate bus conversion in ICT (Information and Communication Technologies) applications.

Claiming excellent thermal capabilities, the high-power module employs Ericsson’s leading-edge HRR technology to deliver high-power conversion across a wide input voltage range, while keeping power losses low. Combined, all these factors have resulted in a module that delivers high-efficiency power conversion with consistant performance in thermally challenging environments. Delivering a typical efficiency that exceeds 96% with a 48 V input and 12 V output at half-load, the module also offers reduced energy and cooling costs. Competitive products will typically dissipate 15% or more power at full load than the PKB4313D.

The PKB4313D is the first product to be launched from Ericsson’s high-power PKB-D eighth-brick platform and will be followed by 3.3 V and 5 V output regulators, as well as additional 12 V output modules that will offer different input voltage ranges and power levels. Meeting the requirements for deployment in distributed power and intermediate bus voltage architectures within the ICT, telecom and industrial sectors, the new module targets high-power and high-performance use in networking and telecommunications equipment, servers and data storage applications, as well as industrial equipment.

In developing the advanced DC/DC module, Ericsson has applied the company’s HRR topology. The technology was initially introduced in the company’s high-end quarter-brick PKM-NH family, but has been further enhanced to deliver better utilization of the powertrain. The scheme operates with ratio-regulation in the low-input range with the ability to handle transients and sudden changes in input voltage, and it operates in normally regulated fixed-voltage mode from a 42 V input and above. The module’s excellent response to line and load transients guarantees the output voltage will remain stable and immune from voltage deviations that are due to power disturbances on the system bus which retains intermediate bus voltage integrity within the tolerance band required by power system architects.

The module’s powertrain also employs full-bridge synchronous rectification on the primary side, which is not commonly found in competitive devices in this price range which combined with the use of latest-generation transistors (FETs) results in excellent efficiency across the entire power range. Use of the HRR control scheme has resulted in a reduction in overall power loss, below a 42 V input, of up to 15%.

The regulator provides higher useable power in high ambient temperatures or limited-airflow environments leading to higher reliability. For example, employment of tellurium copper pins claims to provide excellent thermal transport. In addition, the FETs are placed on the module’s topside, making it easy to attach a thermal gap pad directly to the FETs and transport heat to an optional baseplate to connect the module to a heatsink or coldplate. The module’s optimized design using low-profile thermally critical components also achieves outstanding heat transfer to the baseplate or heatsink.

The PKB4313D comes in the industry-standard eighth-brick format, measuring 58.4 x 22.7 x 9.6 mm. The module is available in through-hole and surface-mount versions to provide high flexibility in board assembly. The module provides 2250 V(dc) input/output (I/O) isolation and also incorporates a number of I/O protection and operational features which include monotonic start-up and remote control as well as input-under-voltage shutdown, output over-voltage, over-temperature and output short-circuit protection. The device meets safety requirements according to IEC/EN/UL60950-1 and has a calculated MTBF of 8.9 million hours.

The PKB4313D has been designed and manufactured by Ericsson to meet the highest standards available for DC/DC power converters in the industry, delivering the levels of quality and confidence that are required by power system designers to develop long-term and high-performance platforms.


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