參數(shù)資料
型號(hào)： celeron processor
廠商： Intel Corp.
英文描述： 32 bit Celeron Processor Mobile Module(32 位帶移動(dòng)模塊處理器)
中文描述： 32位賽揚(yáng)處理器的移動(dòng)模塊（32位帶移動(dòng)模塊處理器）
文件頁(yè)數(shù)： 46/64頁(yè)
文件大?。?/td> 799K
代理商： CELERON PROCESSOR
Celeron
Processor Mobile Module MMC-2
at 650 MHz, 600 MHz, 550 MHz, 500 MHz, and 450 MHz
40
Datasheet
243357-004
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. See
Equation 3
below.
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
μ
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
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 30.0 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/100.0
= 300.0
μ
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
μ
A= 6.0 k
R14 is a 12.0-K resistor. If R33 is also 12.0K, then 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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