POWER SUPPLY DESIGN LEADER

N2Power leads the power density race with its latest small, high efficiency XL275 Series AC –DC power supplies. Our advanced technology yields a very small footprint, reduces wasted power, and offers the highest power density in its class. This efficient design means reduced energy costs, a greater return on your investment, greater reliability and longer product life.

UNMATCHED POWER DENSITY

With an overall height of 1.5" and a 3" x 5" footprint, the XL275 Series boasts a power density over 12 watts per cubic inch. It is ideally suited for OEMs using the industry standard 1U chassis.

HIGH EFFICIENCY IN A SMALL PACKAGE

The XL275 Series provides up to 90% efficiency. Our unique design reduces energy consumption and generates less wasted heat. It requires little forced air cooling, decreases AC loading, increases reliability and economy of operation. Comparisons of efficiencies show that our supplies can reduce losses up to 50%.

ADVANCED DIGITAL CONTROLLER

Power supplies have traditionally been controlled and protected by analog circuitry that does well under one set of conditions (such as cold startup), but suffers from stored charges in components that do not discharge quickly enough to respond to power line dropouts and load glitches. The XL275 is the first power supply in this class to use a dedicated digital micro controller to supervise the unit’s operation. The micro controller monitors the following parameters:

• DC voltage on the bulk capacitor (supplied by the AC mains)
• Output voltage
• Output current
• Auxiliary 12V output voltage
• Transformer temperature
• Ambient temperature
• Fan tachometer

Unlike conventional analog circuitry that can provide timing accuracies in the range of ±10% -20%, the micro controller can provide accuracies in the 1% range and does not suffer from stored charge memory. It responds to changing conditions 500 times each second with knowledge of the past but without being slowed by its knowledge.

COMPLETE PROTECTION

The micro controller is responsible for enabling the main output whenever all of the required startup conditions are met, and shutting it down upon command, loss of input power or whenever excessive loads or temperatures are sensed. It always provides the host system with advanced warning of an impending shutdown to enable it to perform housekeeping before power is lost.

REDUCED NOISE

To minimize acoustic noise, the micro controller can turn a 12V fan on or off based upon the present load conditions and the amount of cooling air available.

I²C BUS OPTION

An optional I²C digital communications interface is also provided to allow up to four XL275 to communicate over the same bus using the PMBus™ protocol. This interface allows routine remote control of the main outputs and the 12V fans. It can also notify the host if a fan fails (lost tachometer pulses). The host can also query the micro controller for its output voltage and current plus the ambient and transformer temperatures.

OEM CUSTOMIZATION

Because it is programmable, the micro controller code can be customized to meet unique OEM requirements.