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| Specifications | 4.PDF wyoshid1 |
| Business section |
| Specifications | 4.PDF wyoshid1 |
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| Content | 20V MOSFETs for DC-DC Converters in Desktop Computers and Servers Dragan Maric and Ralph Monteiro International Rectifier 233 Kansas Street El Segundo, CA 90245 Abstract - The challenge for distributed power supply engineers is to design a fast switching DC-DC converter with improved transient response, while still maintain- ing or increasing efficiency. This has to be achieved in the tight thermal envelope required for reliable system operation and at minimal cost. This paper discusses the use of 20V MOSFETs or the economical design of high efficiency DC-DC converters, replacing more expensive 30V MOSFETs in desktop computers and servers. I. INTRODUCTION Computers constitute one of the most competitive and rapidly evolving markets in the world. Worldwide PC shipments reached nearly 130 million units in 2001 and are expected to reach more than 200 million by 2004, consum- ing more electronic components than any other application [1]. While growth in the PC market continues to be driven by additional features, data storage capacity and improved user friendliness, a new sub-$1000 PC market is growing, making cost effectiveness more important than ever before. At the same time, with each introduction of new faster GHz class processors from Intel or AMD for desktop and server computers, higher frequency DC-DC converters are required to meet the transient response requirements of the new processors. The challenge for distributed power supply engineers is to design efficient switching DC-DC converters with fast transient response. This has to be achieved in the tight thermal envelope required for reliable system operation and at minimal cost. This paper discusses the use of 20V MOSFETs for the economical design of high efficiency DC-DC converters, replacing more exp ensive 30V MOSFETs in desktop computers and servers. The discussion includes an example of MOSFET selection for a synchronous buck circuit and an evaluation of in-circuit efficiency and thermal perfor- mance of the new MOSFETs against the current commer- cial solutions. The ruggedness and reliability of the new 20V MOSFET technology is also discussed. II. UNDERSTANDING POWER LOSSES IN DC-DC BUCK CONVERTERS Latest CPU voltage-regulator specifications from Intel and AMD call for load current slew rates of 400A/µs and peak currents in excess of 100A [2]. The core supply voltage of the CPU must remain within its specified tolerance even when the processor performs a current-load step from a low current “sleep mode” to a high current “active mode” in a single clock cycle. In order to achieve fast transient response circuit designers tend to increase operating frequency. Maintaining or increasing power supply efficiency while increasing frequency is a daunting task that has to be achieved by meticulous design. Understanding power losses in a synchronous buck converter is a necessary step to design a high performance DC-DC converter. The desktop power management system uses a distributed architecture. An AC-DC power supply is used to convert the AC line voltage (85-265V) down to 12VDC. This 12V regulated DC voltage is then converted down to the voltage required by the CPU using a 12V input, sub 2-volt output synchronous buck converter. 1www.irf.com |
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