The 80 PLUS performance specification requires power supplies to be 80% or greater energy efficient at 20%, 50% and 100% of rated load with a true power factor of 0.90. This makes 80 PLUS certified power supplies substantially more efficient than typical supplies. Moreover, the 80 PLUS Platinum efficiency level, to which the HFE2500-48 has been certified, is much more stringent.
The HFE2500-48 operates with a nominal 230 V ac input and provides a 48 V dc, 2500 W output and delivers over 92% efficiency at 20% load, 94% efficiency at 50% load, and over 92% efficiency at 100% load (see attached efficiency graph). In addition, this supply exceeds the required power factor of 0.95 at 50% load with a measured power factor of 0.97.
The HFE2500 series are ideal for data center, distributed power, hot-pluggable and redundant power systems. The supplies can operate off a universal ac input of from 85 to 265 Vac, with active PFC, and provides a well regulated dc output of 12 V, 24 V or 48 V.
With the 19-inch rack-mount enclosure, as many as four supplies can be paralleled with automatic load-sharing to provide up to 9.5 kW of output power. A popular option is an integral MCU in each supply that allows for remote programming, monitoring, and status reporting via an isolated I2C and PMBus interface. In addition, an “energy-saving” feature of the I2C/PMBus interface is that rack-mounted HFE2500 supplies can be individually turned On/Off as the total system load demand varies over time (aka “load-shedding”).
Key applications for the HFE2500 series include data centers, wireless base stations, industrial automation, telecommunications, RF power amplifiers, network equipment, storage systems and distributed power architectures (DPA).
The HFE2500 supplies, each measuring only 1.61 in. (H) x 4.21 in. (W) x 12.8 in. (L), can be used individually or as many as four can be mounted in an 1U-high 19-in. rack enclosure to form a paralleled connected, load-sharing, hot-swap, N + M redundant 9.5 kW power system. Should a fault occur, each supply has an internal O-Ring MOSFET switch that will automatically disconnect it from the load and the other paralleled supplies. In addition, alarm signals and LED indicators are provided to identify a faulty unit.
When employing the model HFE2500-S1U rack-mount enclosure, the dc outputs and current-share lines of each plugged-in HFE2500 supply are automatically connected in parallel with the others. For higher power applications, two 19 in. power racks containing up to eight model HFE2500 supplies can be zero-stacked (no space required between racks) and connected in parallel or series to provide up to 19 kW of total output power in a compact 2U vertical space.
Each HFE2500 supply has two temperature controlled variable-speed fans and can operate in temperatures ranging from -10°C to +70°C. The airflow is directed from the front to the rear of each unit, where the I/O connectors are located.
For system monitoring, opto-isolated signals are provided including dc-OK, ac-Fail and Over-Temperature. Front-panel mounted LED indicators provide a visual status for dc-OK and ac-OK conditions. A remote On/Off control is also standard, as well as remote-sense to compensate for voltage drops in the cables that connect the supply outputs to the load. Other standard features include single wire current-share and an auxiliary 12 V/0.5 A output that is diode OR’d. Remote programming of the output voltage and current can be accomplished via the I2C and PMBus interface, or with an external 0-5 V signal or a 1 k-ohm potentiometer.
The 19-inch rack mount enclosure is available with ac inputs via IEC inlet, type C20 connectors or terminal blocks for each of the four power module slots. All units in the HFE2500 series are fully RoHS-compliant, carry the CE mark and meet UL/EN60950-1 safety specifications, as well as EN55022 and FCC class B EMC conducted specifications; radiated EMC performance complies with class A requirements.