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参数资料
| 型号： | SMS64 |
| 厂商： | Summit Microelectronics, Inc. |
| 英文描述： | Six-Channel Supply Monitor and Sequencing Controller |
| 中文描述： | 6通道电源监视器和排序控制器 |
| 文件页数： | 18/24页 |
| 文件大小： | 647K |
| 代理商： | SMS64 |
SMS64
Preliminary
Summit Microelectronics, Inc
2060 2.22 10/09/03
18
Additional Considerations
An example application circuit is shown in Figure
11. Additional optional noise bypassing components
are shown for the VMX monitor pins. These
components consist of ferrite bead inductors and
capacitors. They may be necessary in very noisy
systems
where
tight
tolerances are needed.
The PUP output pins require series resistors to drive
the gates of the power mosfets. Gate capacitors (C27
thru C32) are also recommended to prevent initial
mosfet, LDO or dc-dc converter turn-on during the
SMS64 power on sequence. To minimize transient
power surges in hot-swappable line card designs,
place a 0.01
μ
F (10nF), 25V, ceramic capacitor on
each PUP output pin to ground.
undervoltage/overvoltage
The PUP output level is programmable to either
logic-level, 10.5V or 14V depending on the type of
power component used in the system. To minimize
the voltage drop across the power mosfets, the device
needs to be fully enhanced to minimize RDS
(ON)
.
However, some mosfets have maximum VGS
specifications of 15V while others are 20V. For
improved sequencing performance with the SMS64, it
is recommended to use the lower rated VGS devices
with the PUP outputs set to 10.5V instead of 14V. The
industry trend for power mosfets is toward lower VGS
specs
while
also
maintaining
specifications.
low
RDS
(ON)
VM
B,E
VCC
A
VCC
B
PUP
A
VM
A,D
PUP
B
VM
C,F
PUP
C
RST_A#
RST_B#
IRQ#
HEALTHY#
PWR_ON/OFF
Sequence
Position 0
Sequence
Position 1
Sequence
Position 2
t
PRTO
Sequence
Position 0
Sequence
Position 1
Sequence
Position 2
t
DPOFFB
t
DPOFFC
V
OFF
V
OFF
V
OFF
Power-Off
Power-On
t
DPOFFA
VCC
C
t
DPONB
V
PTHB
t
DPONC
V
PTHC
t
DPONA
V
PTHA
Figure 10 - The SMS64 sequencing the supplies off then sequencing the supplies back on.
APPLICATIONS INFORMATION (CONTINUED)
相关PDF资料 |
PDF描述 |
|---|---|
| SMS64FR00 | Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR01 | Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR02 | Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR03 | Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR04 | Six-Channel Supply Monitor and Sequencing Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SMS64FR00 | 制造商:SUMMIT 制造商全称:SUMMIT 功能描述:Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR01 | 制造商:SUMMIT 制造商全称:SUMMIT 功能描述:Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR02 | 制造商:SUMMIT 制造商全称:SUMMIT 功能描述:Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR03 | 制造商:SUMMIT 制造商全称:SUMMIT 功能描述:Six-Channel Supply Monitor and Sequencing Controller |
| SMS64FR04 | 制造商:SUMMIT 制造商全称:SUMMIT 功能描述:Six-Channel Supply Monitor and Sequencing Controller |
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