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參數(shù)資料
| 型號： | celeron processor |
| 廠商： | Intel Corp. |
| 英文描述： | 32 bit Celeron Processor Mobile Module(32 位帶移動模塊處理器) |
| 中文描述： | 32位賽揚處理器的移動模塊（32位帶移動模塊處理器） |
| 文件頁數(shù)： | 47/64頁 |
| 文件大小： | 799K |
| 代理商： | CELERON PROCESSOR |
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Celeron
Processor Mobile Module MMC-2
at 650 MHz, 600 MHz, 550 MHz, 500 MHz, and 450 MHz
243357-004
Datasheet
41
If 100
μ
A is selected for I(R20), it would be adequate for the reference and current source base
drive. Since both of these currents must be satisfied at the low power supply margin, a V_DC of
7.5V will be assumed.
Equation 10.
R20 = (V_DC-Vref)/I(R20) = (7.5-2.50)/100.0
μ
A=50.0 k
(To allow for component tolerances, 51.0 k
is recommended.)
5.3.4.5
Slew Rate Control
The Slew Rate Control regulates the rate that the power supply voltage is applied to the system.
Let the Threshold voltage of M1, V
t
= -1.0V
Let M1 V
GS(sat)
= -2.4V, also denoted as V
sat
Let R16 = 100.0 k
Let t_delay = 500.0
μ
S
Let C
total
= The sum or the Bulk capacitors + the sum of the module capacitors = 5 X 22.0
μ
F
+ 2 X 4.7
μ
F=119.4
μ
F
M1 is a low RDS(on) P-Channel MOSFET, such as the Siliconix* Si4435DY. When the power
supply voltage is applied and increased to a value that exceeds the Lockout value, (7.5V will be
used in this example), the Undervoltage Lockout circuit allows R4 to pull up the gate of M3 to start
a turn-on sequence. M3 pulls its drain toward ground, forcing current to flow through R2. M1 will
not start to source any current until after t_delay, with t_delay defined as shown in
Equation 11
and
Equation 12
below.
Equation 11.
Equation 12.
The published minimum threshold of the Si4435DY is a V
GS
of -1.0V, i.e. C9 must charge to 1.0V
before M1 starts to turn on. The delay, t_delay, is the time required to charge C9 to 1.0V.
Assuming a negligible voltage drop across M3, when M3 is on, the voltage on the Gate of M1, V
G
,
with respect to ground, is the voltage developed across R2:
V
G
≡
V
(R2)
. If a minimum steady-state
bias on M1 should be -4.5V, then this will be the voltage dropped across R16. At the low end of the
V_DC margin, i.e. 7.5V, V
G
can be derived from
Equation 13
below.
Equation 13.
V
G
= V_DC+V
GS
= 7.5V- 4.5V = 3.0V (with respect to ground)
t_delay
R2C9
ln 1
.
Vt
V_DC Vg
Vgs
R16
R16 R2
V_DC
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