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參數(shù)資料
| 型號： | SMH4811 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 散熱片 |
| 英文描述： | Heat Sink; Package/Case:TO-220; Thermal Resistance:23 C/W; Mounting Type:Clip-On; Length:6.81mm; Height:25.4mm; Width:20.32mm; Body Material:Aluminum; Body Plating:Anodized; Color:Black; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| 中文描述： | 分布式電源熱插拔控制器 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 358K |
| 代理商： | SMH4811 |
7
2044 6.1 2/8/01
SMH4811A
Preliminary
SUMMIT MICROELECTRONICS, Inc.
Under-/Over-Voltage Filtering
The SMH4811A may also be configured so that an out of
tolerance condition on UV/OV will not shut off the output
immediately. Instead, a filter delay may be inserted so that
only sustained under-voltage or over-voltage conditions
will shut off the output. When the UV/OV filter option is
enabled an out of tolerance condition on UV or OV for
longer than the filter delay time, t
UOFLTR
, activates the
FAULT# output, and the VGATE and PG outputs will be
latched in the off state. To initiate another power-up
sequence the FAULT# output must first be reset. Refer to
the appropriate section on resetting the FAULT# output.
The Under-/Over-Voltage Filtering feature is disabled in
the default configuration of the device.
Under-Voltage Hysteresis
The Under-Voltage comparator input may be configured
with a programmable level of hysteresis. The compare
level may be set in steps (up to 15) of 62.5mV below 2.5V.
The default under-voltage hysteresis level is set to
62.5mV.
Soft Start Slew Rate Control
Once all of the preconditions for powering up the DC/DC
controller have been met, the SMH4811A provides a
means to soft start the external power FET. It is important
to limit in-rush current to prevent damage to the add-in
card or disruptions to the host power supply. For example,
Figure 2. Complete Power On Timing Sequence
V
DD
2044 Fig02 5.0
UV
OV
PD1# +
PD2#
VGATE
DRAIN
SENSE
2.5V
REF
2.5V
REF
11
≤
V
DD
≤
13
t
PDD
PG#
<t
PUVF
50mV
REF
<t
CBD
ENPG
CBSENSE
5V
V
DD
V
DD
–
V
GT
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| 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 |
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