The power supply operates with a wide universal input range of 85 to 305VAC with power factor correction (PFC). Covering a broad range of applications, its output voltage and current can be adjusted from near zero to the maximum allowed for each model.
Several industrial applications require power supplies to operate with limited or no cooling. This includes those operating in harsh environments where electronic equipment is installed in a sealed enclosure, radio communication systems subject to adverse weather conditions, outdoor displays and traffic signals, and indoor equipment with very strict audible noise restrictions. In addition to environmental requirements, reliability and maintenance costs motivate system designers to avoid using fans and blowers.
Conduction cooling requires very specific construction practices, and the PRBX OFI1200A has been designed to ensure optimal heat transfer from the heatsink components to the motherboard, delivering high performance within an operating temperature range of -40 to +95 degrees Celsius on the motherboard. Depending on the mounting method and overall cooling conditions, a power reduction may apply as specified in the technical documentation.
To cover a wide range of applications, the OFI1200A operates with a broad universal input range of 85 to 305VAC (nominal 100 to 277VAC). The unit includes a PFC with a coefficient of 0.98/0.95 (110VAC/230VAC).
The OFI1200A is available in three single-output DC voltage versions: 12V/84A, 28V/43A, and 48V/25A. Utilizing a high-efficiency topology, the typical efficiency of the 48V output unit at 230VAC input is an excellent 92%.
Industrial applications, such as professional lighting or even low-power electrolyzers, require a power supply that delivers a constant and easily adjustable current. Often, this equipment operates in environments that require the electronics to be enclosed and protected from hazards. This requires the power supply to offer external control to adjust the output voltage and/or current from the maximum allowed to almost zero.
To allow customers to precisely adjust the voltage and current to their application, the OFI1200A offers two analog inputs, VTRM and ITRM. Using these inputs, the output voltage and current can be adjusted from near zero up to the model-specified maximum. For example, the 28V output can be adjusted from nearly zero volts to 33.6V, and the output current from nearly zero amps to 43A. The output voltage can also be adjusted using the built-in potentiometer.
This extended adjustment and control functionality simplifies the use of the power supply in constant voltage (CV) or constant current (CC) mode without the need for additional external circuitry.
For applications requiring redundancy or higher power, up to nine units can be connected in parallel, providing an impressive total power level of up to 9,720 W in conduction cooling mode. To maintain maximum efficiency when operating in parallel or redundancy mode, an optional active ORing circuit using high-performance FET technology (Option-O) is available on the OFI1200A28 and OFI1200A48.
For safety, the OFI1200A has 3,000 VAC IN/OUT and 2,000 VAC IN/FG isolation. The output-to-FG isolation is 500 VAC. The power supply includes overcurrent protection with automatic recovery, overvoltage protection, and overtemperature protection.
The OFI1200A board provides easy access to auxiliary functions via its connectors, specifically: Remote Control, Output Voltage Detection, Power Good, VTRM, and ITRM.
The OFI1200A has passed the shock and vibration tests specified in MIL-STD-810H. In this regard, the products have been tested at levels far exceeding normal operating conditions and are designed to withstand high-level shocks, up to 20G.
In its open configuration, the OFI1200A measures 142 x 39 x 260 mm (5.59 x 1.54 x 10.36 inches) and weighs a maximum of 1.2 kg. An optional metal shroud is available, adding only 1 mm to the height and 200 grams to the weight (Option N).
Thanks to its design optimized for conduction cooling, the OFI1200A is suitable for applications requiring a quiet power solution, such as in a control room. It is also well-suited for industrial applications where forced-air cooling is not feasible due to environmental constraints. Connected to a chassis or cooling plate, the OFI1200A can deliver impressive power levels with a high level of reliability.
The OFI1200A is certified to UL62368-1 3rd Edition, cUL (equivalent to CAN/CSA-C22.2 No. 62368-1).
The OFI1200A series comes with a full three-year warranty and complies with European RoHS, REACH, and low-voltage directives. The product is CE, UKCA, and cURus certified.
