Fairchild SEMICONDUCTOR RC5050 Manual, Application Note

1, Application Note 50 Implementing the RC5050 and RC5051 DC-DC Converters on Pentium ® Pro Motherboards www.fairchildsemi.com Introduction This document describes how to implement a switching volt- age regulator using an RC5050 or an RC5051 high speed controller, a power indu…

24, AN50 APPLICATION NOTE 2/98 0.0m Stock#AN30000050  1998 Fairchild Semiconductor Corporation LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAI…

15, APPLICATION NOTE AN50 15 FET. Low Equivalent Series Resistance (ESR) capacitors are best suited for this type of application. Incorrect selection can hinder the converter's overall performance. The input capacitor should be placed as close to the drain of the FET as po…

6, AN50 APPLICATION NOTE 6 Figure 4. Synchronous DC-DC Converter Application Schematic Using the RC5051 VO GND VID3 VID2 VID1 VID0 8 7 6 5 4 3 2 1 9 1011 12 13 14 15 16 17 18 19 20 +5V PWRGD RC5051 VCC ENABLE C10 0.1µF C11 0.1µF 10K C EXT C7 0.1µF C6 4.7 µ F DS1 1N5817 C1 1000 µF C2 C3 1000 µ…

3, Fairchild SEMICONDUCTOR RC5050 APPLICATION NOTE AN50 3 I/O Controls In addition to the Voltage Identification, there are several sig- nals that control the DC-DC converter or provide feedback from the DC-DC converter to the CPU. They are Power- Good (PWRGD), Output Enable (OUTEN), and Upgrade Present (UP#). …

17, APPLICATION NOTE AN50 17 In general, all of the noisy switching lines should be kept away from the quiet analog section of the RC5050. That is, traces that connect to pins 12 and 13 (HIDRV and VCCQP) should be kept far away from the traces that con- nect to pins 1 through 5, and pin 1…