- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384921 > SMH4804 (Summit Microelectronics, Inc.) -48V Programmable Hot Swap Sequencing Power Controller PDF資料下載
參數(shù)資料
| 型號(hào)： | SMH4804 |
| 廠商： | Summit Microelectronics, Inc. |
| 英文描述： | -48V Programmable Hot Swap Sequencing Power Controller |
| 中文描述： | - 48V的可編程序熱插拔電源控制器 |
| 文件頁數(shù)： | 22/41頁 |
| 文件大?。?/td> | 574K |
| 代理商： | SMH4804 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當(dāng)前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁
Timing Diagram
SMH4804
22
2050 3.7 10/30/02
Summit Microelectronics
not all of the supplies turn on, RESET# is not released and
the SMH4804 disables the PG[4:1]# outputs. This
termination timer function can be programmed to abort the
sequence after PG1#, PG2#, PG3# or PG4#.
Soft Start Slew Rate Control
The –48V turn on time is controlled by the SMH4804 and by
the values of R4, C1 and C2 in Figures 21, 22, and 23. The
turn on time is approximately 10ms with the component
values shown in Figure 15. Increasing the capacitance
reduces the output slew rate and increases the turn on time.
The capacitors prevent the MOSFET from turning on
simultaneously with the application of –48V. Resistor R4 is
specified to limit the current into and the rate of charge of
C1. The ratio of C1 to C2 (10:1) limits the MOSFET’s V
GS
to
approximately 5V once the –48V supply is connected and
C1 is fully charged.
Configuring the SMH4804 for Independent
Control of DC-DC Converters for Power-on-
LAN IEEE 802.3
Certain systems employing live card insertion or ‘hot-
swapping’ require independent control of the individual
secondary-side voltages. The SMH4804 Quad Hot Swap
Controller is easily configured for independent on/off control
of up to 4 individual DC-DC converters. A simplified
schematic displaying the SMH4804 enable pins together
with their respective output enabling pins is shown in
Figure 14.
The SMH4804 asserts each of its output enabling pins
(PG[4:1]#) independently of one another as shown in
Figure 14. Applying a logic high (3.5V - 5V) to any of the
‘ENABLE_PGx#’ nodes forces the corresponding output to
a logic low.
For example, to turn on the first DC-DC converter
(assuming its Enable pin requires a low to turn it on),
‘ENABLE_PG1#’ must be high. Taking this node low forces
the SMH4804 output to a high impedance (open-drain)
state. Please refer to Application Brief AB-01 for more
details.
Figure 14. Configuring the SMH4804 as a Quad Independent Hot-Swap Controller.
ENABLE PG1#
ENABLE PG1#
ENABLE PG1#
ENABLE PG1#
To DC-DC #1
To DC-DC #2
To DC-DC #3
To DC-DC #4
SMH4804
FS#
ENPGA
ENPGA
ENPGA
PG1#
PG2#
PG3#
PG4#
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SMH4812 | Distributed Power Hot-Swap Controller |
| SMH4812G | Distributed Power Hot-Swap Controller |
| SMH4812S | Distributed Power Hot-Swap Controller |
| SMH4814 | Dual Feed Active-ORing Programmable Hot Swap Controller |
| SMH4814NCR00 | Dual Feed Active-ORing Programmable Hot Swap Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SMH4804F | 制造商:SUMMIT 功能描述: |
| SMH4811 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DISTRIBUTED POWER HOT SWAP CONTROLLER |
| SMH4811A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DISTRIBUTED POWER HOT SWAP CONTROLLER |
| SMH4811A_09 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Programmable Distributed Power Hot-Swap Controller for High-Availability Systems |
| SMH4811AG | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DISTRIBUTED POWER HOT SWAP CONTROLLER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。