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Fairchild RC5051, RC5050 specifications Application Note

Models: RC5051 RC5050

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APPLICATION NOTE	AN50

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Fairchild RC5051, RC5050 specifications Application Note

Contents

Introduction Intel Pentium Pro Processor Power RequirementsEfﬁciency Output Ripple and NoiseProcessor Voltage Identiﬁcation Output Voltage Programming CodesRC5050 and RC5051 Description Output Enable Outen Power Good PwrgdUpgrade Present UP# Internal Voltage ReferenceDesign Considerations and Component Selection Short Circuit ProtectionOscillator RC5051 Mosfet Selection Table Mosfet Selection CosiderationsLess heat sink required Calculation of Converter Efﬁciency Under Heavy Loads Converter EfﬁciencyImplementing Short Circuit Protection Selecting the InductorRC5050 Short Circuit Comparator Threshold Voltage Short Circuit ComparatorRsense for Various Load Currents Comparison of Sense ResistorsSummary PC Trace Resistor Tolerance 16%Total Tolerance for PC Trace Resistor For each Mosfet RC5050 and RC5051 Short Circuit Current CharacteristicsSchottky Diode Selection Table Schottky Diode SelectionOutput Filter Capacitors ManufacturerInput Filter Bill of MaterialBill of Materials for a 13A Pentium Pro Klamath Application PCB Layout Guidelines PCB Layout Guidelines and ConsiderationsERJ-6GEY050Y ERJ-6ENF10.0KYExample of a PC Motherboard Layout and Gerber File Guidelines for Debugging and Performance Evaluations ProceduresDebugging Your First Design Implementation Performance Evaluation989 11010 505 504 501 496 493 492 491 490488 486Evaluation Summary Case TemperatureIload = 13.9A Device DescriptionApplication Note RC5050 Evaluation Board SummaryDirectory of Component Suppliers Appendix aLife Support Policy