參數(shù)資料
型號： Pentium II 266
廠商： Intel Corp.
英文描述： 32-Bit Processor With Low-Power Module(帶低能量模塊的32位處理器)
中文描述： 32位處理器低功率模塊（帶低能量模塊的32位處理器）
文件頁數(shù)： 32/50頁
文件大?。?/td> 1003K
代理商： PENTIUM II 266
Pentium
II Processor – Low-Power Module
32
Datasheet
4.6.3
Power Planes: Bulk Capacitance Requirements
In order to provide adequate filtering and in-rush current protection for any system design, bulk
capacitance is required. A small amount of bulk capacitance is supplied on the Module, however,
in order to achieve proper filtering additional capacitance should be placed on the system
electronics. Table 20 details the bulk capacitance requirements for the system electronics when
using the Module.
4.6.4
Surge Current Study
Surge current analysis was performed on a typical system power supply to determine the maximum
amount of surge current that the module is capable of handling. This information was then used to
develop the module system I/O bulk capacitance requirements (Table 20). This section provides the
results of this study.
Figure 5 shows an electrical model used when analyzing instantaneous power-on conditions. The
following analysis is provided as a worst case analysis. Depending on the system electronics
design, different impedances may be seen yielding different results. The OEM should perform a
thorough analysis to understand the implications of surge current on their system.
As previously stated, the following study was performed in a “worst-case” situation with no bulk
capacitance on the V_DC line on the system electronics. Given that, the module has two 4.7 μF
with an ESR of 0.3
each. The module connector is approximately 30 m
of series resistance for
a total series resistance of 0.33
. If the user powers the system with the A/C adapter (18 V), the
amount of surge current seen by the capacitors on the module would be greater than 50 Amps!
Figure 6 illustrates the results of this situation with a SPICE simulation.
Table 20. Capacitance Requirement Per Power Plane
Power Plane
Capacitance Require-
ments
ESR
Ripple Current
Rating
V_DC
100 μF, 0.1 μF, 0.01 μF
1
20 m
1-3.5 Amp
3
20% tolerance @ 35 V
V_5
100 μF, 0.1 μF, 0.01 μF
1
100 m
1 Amp
20% tolerance @ 10 V
V_3
470 μF, 0.1 μF, 0.01 μF
1
100 m
1 Amp
20% tolerance @ 6 V
V_3S
100 μF, 0.1 μF, 0.01 μF
1
100 m
1 Amp
20% tolerance @ 6 V
VCC_AGP
22 μF, 0.1 μF, 0.01 μF
1
100 m
1 Amp
20% tolerance @ 6 V
V_CPUPU
2.2 μF, 8200 pF
2
n/a
n/a
20% tolerance @ 6 V
V_CLK
10 μF, 8200 pF
2
n/a
n/a
20% tolerance @ 6 V
NOTES:
1. Placement of above capacitance requirements should be located near the module connector.
2. V_CLK filtering should be located next to the system clock synthesizer.
3. Ripple current specification depends on V_DC input. For 5.0 V V_DC, a 3.5 A device is required. For
V_DC at 18 V or higher, 1 A is sufficient.
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