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參數(shù)資料
| 型號： | S39421S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Hot Swap Voltage Controller |
| 中文描述： | 電壓熱插拔控制器 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 201K |
| 代理商： | S39421S |
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16
S39421
2024 9.0 8/8/00
Slew Rate Control
The nominal slew rate for the VGATE3 and VGATE5
outputs is set at a default value of 250V per second, which
conforms to a number of standards including that for
Compact PCI. This slew rate helps limit current spike
transients as the bypass capacitors of the add-in card are
charged. The conditions for the default slew rate are:
ISLEW input is grounded; and the C
VGATE
capacitance is
less than or equal to 0.08μF.
The slew rate can be extended (made slower) by adding
capacitance to the VGATE outputs. In this case it should
be assumed the I
SLEW
input is grounded. The VGATE
outputs can drive up to 20μA typically, so the slew rate may
be calculated as 20μA
÷
C
VGATE
(not exceeding 250V/s).
Refer to Graph 1 shown below.
300
250
200
150
100
50
0
0
0.1
0.2
0.3
0.4
S
Capacitance (
μ
F)
2024 ILL13.0
The slew rate can be increased (made faster) by injecting
current into the ISLEW input. One quarter of the current
injected into ISLEW will be mirrored out of the VGATE
drivers. The resulting slew rate may be calculated as
I
SLEW
÷
4xC
VGATE
(not less than 250V/s). Example slew
rates are plotted to illustrate the effects of capacitance on
the VGATE output in Graph 2. The reason for the flat
portion of the graph is that the internal slew rate control
operates in parallel to add as much as 20μA (typically) to
help keep the SR at 250V/s.
Note that the ISLEW input is simply a diode-connected
MOSFET. As a consequence, its I-V characteristic is
temperature dependent.
1200
1000
800
600
400
200
0
0
100
200
300
400
S
250V/s
2024 ILL15.0
C = 0.2
μ
F
I
SLEW
Current in
μ
A
C = 0.08
μ
F
FIGURE 17
FIGURE 18
FIGURE 19
Host 5V
To Card 5V
VOUT5
VGTE5
C
VGATE
I
SLEW
3
23
22
S
ISLEW IN
2024 ILL14.1
10
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