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SMH4042ASALN 参数 Datasheet PDF下载

SMH4042ASALN图片预览
型号: SMH4042ASALN
PDF下载: 下载PDF文件 查看货源
内容描述: 分布式电源热插拔控制器的CompactPCI [Distributed Power Hot-Swap Controller for CompactPCI]
分类和应用: 控制器PC
文件页数/大小: 28 页 / 1819 K
品牌: SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
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SMH4042A  
APPLICATIONS  
DESIGNCONSIDERATIONSFORACOMPACTPCI  
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.  
Backend Power Plane  
and Logic  
P2  
Current  
sense  
resistors  
Backend Power  
SwitchingCircuits  
Precharge  
Circuit  
V(I/O)  
eP  
SGNL_VLD  
CBI_3  
1Vref  
VCC5  
ENUM#  
CBI_5  
V(I/O)  
5V  
HST_3V_MON  
3.3V  
CARD_3V_MON  
CARD_5V_MON  
Current  
limiting  
resistors  
V(I/O)  
V(I/O)  
GND  
GND  
VGATE3  
VGATE5  
BD_SEL#  
BD_SEL2#  
GND  
Capacitance  
4.7µf each  
eP  
V(I/O)  
GND  
GND  
GND  
LOCAL_PCI_RST#  
BD_SEL1#  
RESET  
3.3V  
PCI_RST#  
HEALTHY#  
GND, PCI_RST#  
HEALTHY#  
5V  
5V  
SMH4042A  
+12V, -12V  
P1  
2070 Fig11  
Figure 11. Diagram of Typical CompactPCI Board  
limitingresistors. Notetheplacementofthesense(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.  
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  
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.  
2070 9.1 5/27/03  
SUMMIT MICROELECTRONICS, Inc.  
16  
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