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用指南的AMD - K6處理器電源設計應用指南
文件頁數(shù): 27/64頁
文件大小: 1056K
代理商: 21103
Decoupling and Layout Recommendations
17
21103G/0—February 1999
AMD-K6
Processor Power Supply Design
Figure 8. Bulk Decoupling versus Output Voltage Response for 2.2 V @7.5 A
Example 5
Hypothetical 2.4 V @
15A
This example assumes a device with a maximum processor
current transient of 15A, the voltage tolerance of the processor
is less than 100mV, and the voltage regulator response time is
10
μ
s.
Using twelve tantalum capacitors with 60-m
ESR (the parallel
resistance is 5m
) as bulk capacitors, the minimum bulk
capacitance is:
C
O
((15A/(0.100
V – [15A
5m
]
)) 10
μ
s = 6000
μ
F
Twelve 470-
μ
F tantalum capacitors with 55-m
ESR meet this
requirement. Figure 9 on page 18 shows the voltage curve for
this case.
Note:
The denominator of the C
0
equation cannot be a negative
value, which implies a negative capacitor (such as a
battery).
Output Voltage vs. Capacitance
1.7
1.75
1.8
1.85
1.9
1.95
2
2.05
2.1
2.15
2.2
0
470
940
1410 1880 2350 2820 3290 3760 4230 4700
Capacitance in micro Farads
V
Voltage
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