Programmable 800/1500W PSUs provides constant current to low voltages

November 13, 2013 // By Graham Prophet
XP Power's HDS series of 800 and 1500W AC-DC power supplies offer efficiency of up to 93%; these single output low profile supplies measure 249.0 x 127.0 x 40.9 mm and 280 x 127 x 63.5 mm respectively, in a standard 1U or 2U profile. Two front mounted variable speed fans, included in the above dimensions, help conserve energy and keep noise to a minimum. The power density of these compact units is greater than 10 W/in3.

Both the output voltage and output current are programmable from 0% through to 105% of stated nominal through a serial RS232 interface, I 2C interface, a 0 to +5 VDC input or via an external potential divider. By programming the output current a true constant current output is achieved down to almost zero volts, this being significantly better than the industry norm which is typically only down to 20-40%.

The HDS series comprises seven models covering nominal outputs from +12 to +60 VDC. The output voltage for both series can also be manually adjusted ± 5% by a trim function in order to make up for line losses. Both ranges also provide a user selectable standby output of 5 VDC / 0.5A or 9 VDC / 0.3A when the AC input is present.

The units have signals and controls such as remote on/off, AC OK, remote sense, PWM switching and over-temperature shutdown. I 2C serial data connections provide for bi-directional data transmission between the power supply and external monitoring / controlling equipment.

A current sharing function provides for parallel operation of up to five power units for applications that might require a higher output power or for redundancy purposes. Accommodating the full universal input voltage range of 90 – 264 VAC, the HDS800/1500 is suitable for world-wide use. They have an extended operating temperature range from -10 to +70C (+60C for HDS1500) with no derating until +50C. The series is approved to the internationally recognised safety specification IEC 60950-1 for ITE, industrial and commercial equipment. The units also comply with EN55022 Class B specification for conducted and radiated EMI. They have a 3 year warranty.

XP Power; www.xppower.com