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| 型號(hào)： | 22495 |
| 英文描述： | Implementation of Write Allocate Application Note Mobile AMD-K6 Processor Power Supply Design Application Note |
| 中文描述： | 在寫分配執(zhí)行情況的說明移動(dòng)應(yīng)用的AMD - K6處理器電源設(shè)計(jì)應(yīng)用指南 |
| 文件頁數(shù)： | 37/50頁 |
| 文件大?。?/td> | 1087K |
| 代理商： | 22495 |
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Decoupling and Layout Recommendations
27
22495C/0—May 1999
Mobile AMD-K6
Processor Power Supply Design
5. Solving the following equations for N:
1.8nH/N = 100pH
N = 1.8nH/100pH = 18
The number of capacitors required is 18.
The following steps repeat the calculation for I/O decoupling:
1. Determine the amount of capacitance required using the
following equation:
I = C (dv/dt)
C = I (dt/dv) = 0.5 (2.5nsec/145mV) = 0.0086
μ
F
This equation indicates that if the capacitors didn’t have
inductance, only one 0.1-
μ
F capacitor would be required.
2. Using 0.5A as a typical I
CC3
value, repeat the calculations to
account for inductance:
Note:
The ripple budget is 145mV because the I/O drivers are
not as sensitive to supply variations as the core and the
current transient is smaller.
L = V (dt/di) = 0.145 (2.5nsec/.5A) = 725pH
Solving for L, the allowed budget is 725pH.
The number of capacitors = 1.8nH/725pH = 2.5. Therefore,
only three capacitors are required on the I/O. AMD
recommends six capacitors.
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