參數資料
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： 25/64頁
文件大小： 1056K
代理商： 21103
Decoupling and Layout Recommendations
15
21103G/0—February 1999
AMD-K6
Processor Power Supply Design
Figure 6. Load Current Step versus Output Voltage Response
Allocation of the voltage error budget can be determined from
Figure 6 on page 15. Given a total error budget of 100mV and
using good capacitors (ten 470
-
μ
F capacitors with a 55-m
ESR
are assumed), voltage drops for a 0.35-
μ
m processor can be
allocated as shown in Table 1.
Figure 7 on page 16 shows the voltage drop as a function of bulk
decoupling for the 3.2V case. The graph was calculated using
55-m
ESR, 470
-
μ
F capacitors, and gives the designer a visual
representation of how much bulk decoupling is needed. For
example, at 2820
μ
F, the voltage is 3.1V (10A current
transient), leaving no margin for DC-tolerance errors. At
4700
μ
F, the voltage is 3.144V, allowing 0.058mV for set point
tolerance, ESR, and ESL drop.
Table 1.
Voltage Error Budget for 0.35-Micron Processors (Model 6)
Error Budget
Component
V (Set Point)
Calculations*
Budgeted
Drop
0.032 V
1%
5.5
m
x 10 A
(5.5 m
= 55m
/ 10)
0.12 nH x (10 A/10 nsec)
{0.12 nH = (0.6 nH + 0.6 nH via) / 10}
V(ESR)
0.055 V
V(ESL)
0.012 V
Total
Note:
0.099 V
*
Calculations assume 10 capacitors
(Max)
I
CC
Load
Current
Output
Voltage
Response
V
CC
Voltage Regulator Response
(Min)
(Max)
(Min)
ESR
x
I
ESL
x
I
t
I
C
V
t
=
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