Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

S39421 Datasheet(PDF) 16 Page - Summit Microelectronics, Inc.

Part # S39421
Description  Hot Swap Voltage Controller
PDF  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  SUMMIT [Summit Microelectronics, Inc.]
Direct Link  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

S39421 Datasheet(HTML) 16 Page - Summit Microelectronics, Inc.

Back Button S39421 Datasheet HTML 12Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 13Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 14Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 15Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 16Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 17Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 18Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 19Page - Summit Microelectronics, Inc. S39421 Datasheet HTML 20Page - Summit Microelectronics, Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 16 / 28 page
background image
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 CVGATE 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 ISLEW input is grounded. The VGATE
outputs can drive up to 20µA typically, so the slew rate may
be calculated as 20µA ÷ CVGATE (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
Capacitance (
µF)
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
ISLEW ÷ 4xCVGATE (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
250V/s
2024 ILL15.0
C = 0.2
µF
ISLEW Current in
µA
C = 0.08
µF
FIGURE 17
FIGURE 18
FIGURE 19
Host 5V
To Card 5V
VOUT5
VGTE5
CVGATE
ISLEW
3
23
22
ISLEW IN
2024 ILL14.1
10
Ω



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com