參數(shù)資料
型號(hào)： 21103
英文描述： AMD-K6 Processor Family Thermal Solutions Application Note AMD-K6 Processor Power Supply Design Application Note
中文描述： 的AMD - K6處理器系列散熱解決方案應(yīng)用指南的AMD - K6處理器電源設(shè)計(jì)應(yīng)用指南
文件頁(yè)數(shù)： 35/64頁(yè)
文件大?。?/td> 1056K
代理商： 21103
Decoupling and Layout Recommendations
25
21103G/0—February 1999
AMD-K6
Processor Power Supply Design
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 capacitors would be needed.
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 needed on the I/O. AMD
recommends a minimum of six capacitors.
Figure 12. 0.1
μ
F (c1) and 0.01
μ
F (c2) X7R Capacitor Impedance versus Frequency
1 106
1 107
1 108
1 109
0.1
1
10
100
15.9312
0.191752
Zo(
)
,
,
,
c2 L r w
Zo(
)
,
,
,
c1 L r w
1e+009
1e+006
w
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