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参数资料
| 型号： | MPM22CGA800A |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 800 MHz, MICROPROCESSOR, XMA |
| 封装： | MMC-2 |
| 文件页数： | 46/68页 |
| 文件大小： | 966K |
| 代理商： | MPM22CGA800A |
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Pentium
III Processor Mobile Module MMC-2
Featuring Intel
SpeedStep Technology
44
Datasheet
243356-006
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.
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/100.0
= 150.0 A
Note:
For a successful design, the input offset of the comparator should also 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 with Equation 5.
Equation 5.
R14= 1.8V/150.0
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 30.0 mV.
If R13 is selected to be 100.0
, the current can then be calculated as shown in Equation 7 below.
Equation 7.
Ioffset= 30.0 mV/100
= 300.0 A
The value of the parallel combination of R14 and R33 can now be calculated as shown in Equation
8 below.
Equation 8.
Rcombo= 1.8V/300.0
A= 6.0 k
R14 is a 12.0-K resistor. If R33 is also 12.0K, the parallel combination will be 6.0K.
In R20, the LM4040-2.5 has a very wide operating current range from 60.0
A to 15.0 A. In order
to provide the current source base drive you will need Equation 9.
Equation 9.
Ibase
≈ Ic/b= 300.0 A/100 = 3.0 A
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