VSBU-120-T312A

The VSBU-120-T312A is a 120-watt AC/DC converter manufactured by CUI Inc., designed for reliable off-board power delivery in industrial and commercial applications. This unit accepts a wide universal input voltage range of 90 to 260 Vac at 47 to 63 Hz, making it suitable for global deployment without manual reconfiguration. The internal circuitry incorporates active power factor correction, maintaining a power factor between 0.95 and 0.97 under full load conditions.

Electrical performance centers on three isolated output rails. The primary rail provides 3.3 Vdc at up to 15 A, while two secondary rails deliver 12 Vdc at 6 A and 0.8 A respectively. Each output exhibits low ripple and noise, capped at 66 mVp-p for the 3.3V rail and 120 mVp-p for the 12V rails. The converter achieves an efficiency rating of 80%, with line regulation held to 0.5% and load regulation within 3%. Transient response recovers within 4 milliseconds when transitioning between full and half load conditions.

Mechanically, the unit measures 127.0 mm in length, 76.2 mm in width, and 32.5 mm in height. It utilizes a robust chassis mount configuration, allowing secure attachment to equipment enclosures or panel cutouts. The operating temperature range spans from 0°C to 70°C, requiring derating above 50°C to maintain rated output power. This form factor supports integration into control cabinets, telecommunications racks, and automated machinery where space-efficient, high-current DC power is required.