CUI's Solus-based next-gen intermediate-bus quarter-brick delivers up to 720 W



NQBS quarter brick

CUI has introduced its second-generation high-density isolated intermediate bus converter (IBC) family - the NQBS series. The family has been specifically created to address the rising power requirements and efficiency demands in telecom systems and data centers.

Launched at the Applied Power Electronics Conference (APEC) in Fort Worth, Texas, the NQBS modules are housed in a quarter brick package and deliver a power density of 27.2 W/cm3 (445 W/in3) as well as efficiencies in excess of 96%.

These IBC devices are among the first to incorporate the company’s Solus® Power Topology, which delivers a greater power density, higher efficiency, faster transient response, and lower EMI in both isolated and non-isolated dc-dc converter designs. Additionally, CUI has incorporated full regulation across the entire 42~60 Vdc input range and a droop load share feature with 10% current share accuracy for higher power boards.

As part of CUI’s Novum Advanced Power® portfolio, the 720 W NQBS series outputs 12 Vdc @ 60 A in an industry standard DOSA footprint (58.4 x 36.8 x 12.3 mm - 2.30 x 1.45 x 0.485-inch) and provides input to output isolation of 2250 Vdc. Additional features include insulation that meets EN60950 standards, remote on/off control, and an optional heat sink for improved thermal performance.

The module’s Solus topology integrates a conventional buck converter into a SEPIC converter to form a SEPIC-fed buck converter; a single stage architecture with one magnetic element, one control switch, and two commutation switches that are optimally controlled by pulse-width modulation (PWM). With lower voltage and current stresses in the topology coupled with an inherent gate charge extraction (GCE) process, the architecture is able to reduce switching turn-on losses by 75% and switching turn-off losses by 99% on the control FET compared to a conventional buck converter. The Solus Topology further increases total efficiency by distributing the energy delivery into multiple paths, reducing circuit conduction losses by nearly 50%.

“As more of the world comes online, designers of next-generation networking equipment are being asked to manage significantly higher power demands in the same space,” said Mark Adams, CUI’s Senior Vice President.
“Maximizing efficiency and power density at every point in the power architecture has, therefore, become critical. When combined into a distributed power system, we believe our Novum Advanced Power portfolio provides an extremely compelling answer to the growing power challenges in today’s networking designs,” concluded Adams.
Engineering samples are available immediately for select customers.