The NQBS modules are housed in a quarter brick package and deliver a power density of 27.2 W/cm 3 (445 W/in 3) as well as efficiencies in excess of 96%. The Solus Power Topology, CUI claims, delivers a greater power density, higher efficiency, faster transient response, and lower EMI in both isolated and non-isolated dc-dc converter designs. The module incorporates 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.
CUI first used the topology in a recently-announced point-of-load regulator.
As part of CUI’s Novum Advanced Power portfolio, the 720W NQBS series outputs 12 Vdc at 60A in an industry standard DOSA footprint (58.4 x 36.8 x 12.3 mm) 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%.