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參數(shù)資料
| 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(yīng)用指南的AMD - K6處理器電源設(shè)計應(yīng)用指南 |
| 文件頁數(shù)： | 22/64頁 |
| 文件大?。?/td> | 1056K |
| 代理商： | 21103 |
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12
Decoupling and Layout Recommendations
AMD-K6
Processor Power Supply Design
21103G/0—February 1999
Current Transient
Response
In the power distribution model shown in Figure 5 on page 11,
C
B
represents bulk capacitors for the power supply and C
F
represents high-frequency capacitors for processor decoupling.
The bulk capacitors supply current to the processor during
sudden excessive current demands that cannot be supplied by
the voltage regulator (for example, transitioning from the Stop
Grant state to normal mode). The required C
B
can be calculated
by the following equation (ideal case):
Where:
I is the maximum processor current transient
V is the tolerance times the nominal processor voltage
t is the voltage regulator response time
I
I
I
Examples
The following examples are not the only solutions. Based on the
availability of parts and the choice of controller, many correct
solutions are possible. The examples, which use tantalum
capacitors, are intended to give insight into the requirements,
not to specify a particular solution. The use of aluminum
electrolytic capacitors are acceptable as long as good quality,
low-ESR parts are used.
Example 1
Theoretical 3.2V @
10A
Assuming the maximum processor current transient is 10A, the
voltage tolerance of the processor is less than 100mV (3% of
3.2V), and the voltage regulator response time is 10
μ
s, the
minimum capacitance for the bulk decoupling is:
C
B
≥
(10A/0.100V)
10
μ
s = 1000
μ
F
ESR (equivalent series resistance) and ESL (equivalent series
inductance) are introduced in the model shown in Figure 5. C
B
contains ESR and ESL, which cause voltage drop during current
transient activity (See Figure 6 on page 15). The resistive and
inductive effect of the capacitors must be taken into account
when designing processor decoupling. Low ESL and ESR
capacitors should be used to obtain better voltage and current
output characteristics. The voltage error budget for ESL is
C
≥
I
V
t
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