Fairchild RC5051 specifications Summary, RC5050 Evaluation Board

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AN50

APPLICATION NOTE

 

 

Summary

This application note covers many aspects of the RC5050 and RC5051 for implementation of a DC-DC converter a on Pentium Pro motherboard. A detailed discussion includes the processor power requirements, a description of the RC5050 and RC5051, design considerations and compo- nents selection, layout guidelines and considerations, guide- lines for debugging, and performance evaluations.

RC5050 Evaluation Board

Raytheon Electronics provides an evaluation board to verify- ing system level performance of the RC5050. The evaluation board serves as a guide to performance expectations when using the supplied external components and PCB layout.

Call Raytheon Electronics local Sales Office or the Market- ing department at 415-966-7819 for an evaluation board.

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Contents Intel Pentium Pro Processor Power Requirements IntroductionProcessor Voltage Identification Output Ripple and NoiseEfficiency Output Voltage Programming CodesRC5050 and RC5051 Description Upgrade Present UP# Power Good PwrgdOutput Enable Outen Internal Voltage ReferenceShort Circuit Protection Design Considerations and Component SelectionOscillator RC5051 Mosfet Selection Cosiderations Mosfet Selection TableLess heat sink required Converter Efficiency Calculation of Converter Efficiency Under Heavy LoadsRC5050 Short Circuit Comparator Threshold Voltage Selecting the InductorImplementing Short Circuit Protection Short Circuit ComparatorComparison of Sense Resistors Rsense for Various Load Currents16% Summary PC Trace Resistor ToleranceTotal Tolerance for PC Trace Resistor RC5050 and RC5051 Short Circuit Current Characteristics For each MosfetOutput Filter Capacitors Schottky Diode SelectionSchottky Diode Selection Table ManufacturerBill of Material Input FilterBill of Materials for a 13A Pentium Pro Klamath Application ERJ-6GEY050Y PCB Layout Guidelines and ConsiderationsPCB Layout Guidelines ERJ-6ENF10.0KYExample of a PC Motherboard Layout and Gerber File Debugging Your First Design Implementation ProceduresGuidelines for Debugging and Performance Evaluations Performance Evaluation488 11010 505 504 501 496 493 492 491 490989 486Iload = 13.9A Case TemperatureEvaluation Summary Device DescriptionApplication Note Summary RC5050 Evaluation BoardAppendix a Directory of Component SuppliersLife Support Policy