Application Note | Fairchild RC5051, RC5050 instruction

APPLICATION NOTE	AN50

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Fairchild RC5051, RC5050 specifications Application Note

Contents

Introduction Intel Pentium Pro Processor Power Requirements Efﬁciency Output Ripple and NoiseProcessor Voltage Identiﬁcation Output Voltage Programming Codes RC5050 and RC5051 Description Output Enable Outen Power Good PwrgdUpgrade Present UP# Internal Voltage Reference Design Considerations and Component Selection Short Circuit ProtectionOscillator RC5051 Mosfet Selection Table Mosfet Selection Cosiderations Less heat sink required Calculation of Converter Efﬁciency Under Heavy Loads Converter Efﬁciency Implementing Short Circuit Protection Selecting the InductorRC5050 Short Circuit Comparator Threshold Voltage Short Circuit Comparator Rsense for Various Load Currents Comparison of Sense Resistors Summary PC Trace Resistor Tolerance 16%Total Tolerance for PC Trace Resistor For each Mosfet RC5050 and RC5051 Short Circuit Current Characteristics Schottky Diode Selection Table Schottky Diode SelectionOutput Filter Capacitors Manufacturer Input Filter Bill of MaterialBill of Materials for a 13A Pentium Pro Klamath Application PCB Layout Guidelines PCB Layout Guidelines and ConsiderationsERJ-6GEY050Y ERJ-6ENF10.0KY Example of a PC Motherboard Layout and Gerber File Guidelines for Debugging and Performance Evaluations ProceduresDebugging Your First Design Implementation Performance Evaluation 989 11010 505 504 501 496 493 492 491 490488 486 Evaluation Summary Case TemperatureIload = 13.9A Device Description Application Note RC5050 Evaluation Board Summary Directory of Component Suppliers Appendix a Life Support Policy