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| 型號： | 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用指南的AMD - K6處理器電源設計應用指南 |
| 文件頁數(shù)： | 33/64頁 |
| 文件大?。?/td> | 1056K |
| 代理商： | 21103 |
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Decoupling and Layout Recommendations
23
21103G/0—February 1999
AMD-K6
Processor Power Supply Design
Table 6 lists recommended capacitor types.
The recommendations in Table 6 are not the only solutions.
Based on the availability of parts and the choice of controller,
many correct solutions are possible. The information in Table 6
is intended to give insight into the requirements, and not to
specify a particular solution. In addition, aluminum
electrolytics can be used instead of tantulum capacitors. This
approach is acceptable as long as good quality, low-ESR parts
are used. The biggest problem with aluminum electrolytics is
the large decrease in capacitance as they age.
High-Frequency
Decoupling
Inductance is also a concern for the high-frequency decoupling
capacitors. Case size can be a significant factor affecting
capacitor inductance. For example, a 0603 case has
significantly more inductance than a 0612 case. AMD
recommends the 0612, 1206, 0805, and 0603 case in order of
best to worst. Inductance can also be reduced by directly
connecting the capacitor to the power pin of the processor. In
order to minimize its inductance, this trace must be short and as
wide as possible. This technique effectively removes two via
inductances between the capacitor and the processor as shown
in Figure 13 on page 26. The dotted line shows that connecting
the capacitor directly to the processor eliminates two series
inductances. However, this trace also has inductance—if it is
too long or too narrow it can be worse than the vias.
Figure 12 on page 25 shows the effect of inductance at higher
frequencies. (The numbers outside the X and Y axis indicate
the minimum and maximum values plotted). The inductance
Table 6.
Capacitor Recommendations
Manufacturer
AVX
Vishay Sprague
Kemet
Type
Comment
exceptional
exceptional
excellent
Web
TPS
594D
T510
SA/SG / OS-CON
4SP560M
593D
T495
SLR series
FA
RJH/RJJ
/www.avxcorp.com
/vishay.com/vishay/sprague
/www.kemet.com
Sanyo
excellent
/www.sanyovideo.com
Vishay Sprague
Mallory
Nemco
Panasonic
Elna
good
good
good
good
good
/vishay.com/vishay/sprague
/www.nacc-mallory.com
/www.nemcocaps.com
/www.panasonic.com/pic
/www.elna-america.com
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