Programmable 800W and 1500W PSUs have Constant-Current Output to nearly Zero Volts

XP Power plc today announced the HDS series of 800W and 1500W programmable ac-dc power supplies. With a typical efficiency of up to 93%, these single-output, low-profile supplies measure 9.80 x 5.00 x 1.61 inches (249.0 x 127.0 x 40.9 mm) for the 800W models and 11.02 x 5.0 x 2.5 inches (280 x 127 x 63.5 mm) for the 1500W range and fit into an industry 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 10W per cubic inch.

Both the output voltage and output current are programmable from 0% through to 105% of stated nominal through a serial RS232 interface, I2C 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 the popular 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 5Vdc / 0.5A or 9Vdc / 0.3A when the ac input is present.

The units include a comprehensive set of signals and controls such as remote on/off, AC OK, remote sense, PWM switching and over-temperature shutdown. A multifunction LED indicates the power supply status and gives warning notifications through use of different colors and blinking rates. In addition, I2C 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. This also allows for system scalability of any future increased power requirements. 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 degrees C to +70 degrees C (+60 degrees C for HDS1500) with no derating until +50 degrees C. The series is approved to the internationally recognized 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.

Typical applications for the HDS800/1500 include use in semiconductor manufacturing equipment, battery charging and automatic test equipment. The HDS800 is priced at $296.40 each in 500 pcs quantities. HDS1500 models are $585.00 for 500 pcs orders. They are available direct from XP Power and come with a 3 year warranty.