參數(shù)資料
型號(hào)： SMH4042AGBLM
廠商： Electronic Theatre Controls, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Distributed Power Hot-Swap Controller for CompactPCI
中文描述： 分布式電源熱插拔控制器的CompactPCI
文件頁數(shù)： 16/28頁
文件大?。?/td> 1822K
代理商： SMH4042AGBLM
16
SMH4042A
2070 9.1 5/27/03
SUMMIT MICROELECTRONICS, Inc.
APPLICATIONS
DESIGN CONSIDERATIONS FOR A COMPACTPCI
BOARD
Figure 11 is a generic representation of a
CompactPCI
board and it illustrates how the SMH4042A is the key
component in the board insertion/removal process. The
illustrations that follow show in more detail how the
various blocks interface to the SMH4042A.
Power Busses
It is important in the design of the board to ensure the
backend logic is isolated from the power control circuits
and other early power circuits such as FPGAs and the I/
O interface circuits. In Figure 12 the early power busses
for 5V and 3V have series current limiting resistors.
These values should be calculated so as to limit the in-
rush current that will initially charge the capacitive load
of the early power circuits. As the card is inserted further,
the medium length pins engage and short out the current
limiting resistors. Note the placement of the sense (shunt)
resistors. They are in series with the power FETs and no
voltage drop will be detected across the resistor until
VGATE is applied to the power FETs. The sense resistor
values are determined by dividing 50mV by the current
specification for that supply.
It should be noted that there is an inherent delay from
VGATE5 turning on to VGATE3 turning on. The typical
delay is illustrated in Figure 13.
Figure 11. Diagram of Typical CompactPCIBoard
2070 Fig11
Backend Power Plane
and Logic
B
I
Backend Power
SwitchingCircuits
SMH4042A
RESET
V(I/O)
5V
3.3V
GND
BD_SEL#
GND
GND
GND
GND
5V
5V
P1
P2
ENUM#
CARD_3V_MON
CARD_5V_MON
VGATE3
VGATE5
PCI_RST#
GND
HST_3V_MON
VCC5
BD_SEL2#
Precharge
Circuit
V(I/O)
LOCAL_PCI_RST#
Current
limiting
resistors
V(I/O)
V(I/O)
V(I/O)
eP
SGNL_VLD
CBI_3
CBI_5
eP
HEALTHY#
Capacitance
4.7μf each
BD_SEL1#
1Vref
Current
sense
resistors
相關(guān)PDF資料
PDF描述
SMH4042AGBLN TERM 5"7 TS GRAPH. BLUE MODE OPT.VERS.
SMH4042ASAHM TERM 5"7 TS GRAPH. MONO LOW END VERS.
SMH4042ASAHN TERM 5"7 TS GRAPH. MONO STD. VERS.
SMH4042ASAKM TERM.5"7 TS GRAPH. C.STN LOW END VERS.
SMH4042ASAKN TERM.5"7 TS GRAPH. C.TFT STD. VERS.
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SMH4042AGBLN 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Distributed Power Hot-Swap Controller for CompactPCI
SMH4042ASAGM 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 for CompactPCI
SMH4042ASAGN 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 for CompactPCI
SMH4042ASAHM 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 for CompactPCI
SMH4042ASAHN 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 for CompactPCI
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