參數(shù)資料
型號: 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)行情況的說明移動應(yīng)用的AMD - K6處理器電源設(shè)計應(yīng)用指南
文件頁數(shù): 23/50頁
文件大?。?/td> 1087K
代理商: 22495
Decoupling and Layout Recommendations
13
22495C/0—May 1999
Mobile AMD-K6
Processor Power Supply Design
Example 2
Example 1 assumes the maximum processor current transient is
6A, the voltage tolerance of the processor is less than 100mV,
and the voltage regulator response time is 10
μ
s.
Assuming five tantalum capacitors with 55-m
ESR (the
parallel resistance is 11m
) are used as bulk capacitors, the
minimum bulk capacitance is:
C
O
((6A/(0.100
V – [6A
11
m
]
))
10
μ
s = 1764
μ
F
In Example 2, the effect of the ESR requires the addition of
more capacitance than the ideal shown in Example 1.
In order to achieve more margin, the total error budget should
be distributed between set point tolerance, ESL, and ESR as
shown in Figure 7 on page 14 and Table 1 on page 15. Although
the drop from ESL is a small factor, it is not negligible. If
aluminum electrolytic capacitors are used instead of tantalum
capacitors, the ESL drop is larger.
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