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參數(shù)資料
| 型號： | Pentium III cpu with mobile |
| 廠商： | Intel Corp. |
| 英文描述： | Pentium III processor Mobile Module Connector 2 (MMC-2)(帶移動模塊連接器2奔III處理器) |
| 中文描述： | 奔騰III處理器的移動模塊連接器2（絲裂霉素2）（帶移動模塊連接器2奔三處理器） |
| 文件頁數(shù)： | 46/64頁 |
| 文件大?。?/td> | 773K |
| 代理商： | PENTIUM III CPU WITH MOBILE |
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Pentium
III Processor Mobile Module MMC-2
40
Datasheet
245304-003
If the maximum I_DC expected is 3.0A, consider setting the I_DC Current Limit at 6.0A. If the
Current Sense resistor, R1, is selected to be 5.0 m
(0.005
), the maximum voltage developed
across this resistor can be calculated. See below.
Consider now the case where V_DC is above 14.0V.
Equation 3.
I_DC(limit)*Rsense= 3.0A*5E-3= 15.0 mV)
The Offset voltage applied to the inverting input of the comparator, U1B, should then be 15.0 mV.
If R13 is selected to be 100.0
, the current can then be calculated as shown in
Equation 4
below.
Equation 4.
Ioffset= 15.0 mV/100
= 150.0
μ
A
Note:
For a successful design, the input offset of the comparator must be considered. One option is that
the design offset is at least ten times greater than the device offsets.
The value of R14 can now be calculated as shown in
Equation 5
below.
Equation 5.
R14= 1.8V/150.0
μ
A= 12.0 k
(The nearest 1% value is 12.1K.)
Consider now the case when V_DC drops below 14.0V and the current limits shift to 6.0A.
Equation 6.
I_DC(limit)*Rsense= 6.0A*5E-3= 30.0 mV
The Offset voltage applied to the inverting input of the comparator, U1B, should then be 30 mV. If
R13 is selected to be 100
, the current can then be calculated as shown in
Equation 7
below.
Equation 7.
Ioffset= 30.0 mV/100
= 300.0
μ
A
The value of parallel combination of R14 and R33 can now be calculated as shown in
Equation 8
below.
Equation 8.
Rcombo= 1.8V/300.0
μ
A= 6.0 k
R14 is a 12.0-K resistor. If R33 is also a 12.0-K resistor, the parallel combination will be 6.0K.
In R20, the LM4040-2.5 has a very wide operating current range from 60.0
μ
A to 15.0
μ
A. In order
to provide the Current Source Base drive you will need
Equation 9
.
Equation 9.
Ibase
≈
Ic/b= 300.0
μ
A/100= 3.0
μ
A
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