High-efficiency 750-W AC/DC supplies suit industrial and medical apps

By Alix Paultre, contributing editor

XP Power’s GSP750 series 750-W AC/DC power supplies offer high efficiency, a peak power capability of 900 W, single outputs, intelligent fan cooling, and industrial and medical safety approvals. The devices come in a low-profile 1-U-high chassis with a 4 x 10-in. footprint in a compact mechanical package with class-leading efficiency. In addition, for certain applications, the unit’s peak power capability of 900 W could offer reduced expenditure for companies rather than implementing a power supply that is rated for continuous operation at more than 750 W.

The three models offer respective output voltages of 12, 24, and 48 Vdc, with a 5-V standby supply rated at up to 3-A output to supply logic circuits, a key requirement for test and measurement applications. The series offers a high efficiency of 90% and a very flat efficiency curve across the entire load range, with a range of IT and medical standards including third-edition medical safety and fourth-edition EMC standards. Specific standards include IT60950-1 and ANSI/AAMI ES60601-1 and IEC60601-1.

Resonant topologies throughout the design minimize losses and reduce noise, as well as synchronous rectification further reducing losses and enhancing efficiency. Units in the series also feature intelligent variable-speed load-dependent fans to optimize acoustic noise, which is very important in low-profile applications. The fans also shut off at loads below 50 W, when end equipment is in standby mode, extending fan life and further reducing noise levels.

Other specifications include: power-fail signal; signal level control of output; always-on 5-V output to supply logic circuits; output good LED; and remote sense and current sharing for up to three units. The series’ continuous output power of 750 W is delivered over a wide operating temperature range of –40°C to 70°C with derating above 50°C.