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5V/2A standby power supply for Intel-compliant ATX applications

Posted: 14 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power supply unit? Ethernet? standby voltage?

ATX power supply units (PSU) require a standby section that keeps alive some particular areas of the motherboard. Among the live sections are the USB ports, the Ethernet controller and so on. The Intel ATX Power Supply Design Guide 2.01 describes the standby voltage rail needed for this purpose.

On top of these requirements, most of PSU designers use the standby power supply as an auxiliary rail to power the main controller. This is an auxiliary 12--13 V rail or, if an UC384X is implemented, this rail can go up to 20 V. When put in standby, a small switch shuts down the controller by interrupting this rail.

To help designers quickly fulfilling the above needs, the NCP1027 has been introduced. This DIP 8 package hosts a high performance controller together with a low RDS(on) 700 V BVdss MOSFET. On top of the standby needs, we have packed other interesting goodies in this circuit.

Please view the PDF document for more information.

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