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參數(shù)資料
| 型號： | SMH4802 |
| 廠商： | Summit Microelectronics, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Programmable -48V Hot-Swap Controller with Forced Shut Down |
| 中文描述： | 可編程的- 48V熱插拔控制器強(qiáng)制關(guān)機(jī) |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 573K |
| 代理商： | SMH4802 |
2
SMH4802
2062 2.3 6/19/03
SUMMIT MICROELECTRONICS, Inc.
Preliminary Information
FUNCTIONAL BLOCK DIAGRAM
The SMH4802 is an integrated power controller for hot
swappable add-in cards. The device operates from a wide
supply range and generates the signals necessary to
drive an isolated output DC/DC converter. As a typical
add-in board is inserted into the powered backplane,
physical connections must first be made with the chassis
to discharge any electrostatic voltage potentials. The
board then contacts the long pins on the backplane that
provide power and ground. As soon as power is applied,
the device starts up, but does not immediately apply
power to the output load. Under-voltage and over-voltage
circuits inside the controller verify the input voltage is
within the user-specified range.
Once these requirements are met, the hot-swap controller
enables VGATE to turn on the external power MOSFET.
The VGATE output is current limited to I
VGATE,
allowing the
slew rate to be easily modified using external passive
GENERAL DESCRIPTION
components. During the controlled turn-on period the V
DS
of the MOSFET is monitored by the DRAIN SENSE input.
When DRAIN SENSE drops below 2.5V, and VGATE is
greater than V
DD
– V
GT
, the PG# output can begin turning
on the DC/DC converter.
Steady state operation is maintained as long as all
conditions are normal. Any of the following events may
cause the device to disable the DC/DC controller by
shutting down the power MOSFET: an under-voltage or
over-voltage condition on the host power supply; an over-
current event detected on the CBSENSE input; a failure
of the power MOSFET sensed via the DRAIN SENSE pin;
the master enable (EN/TS) falling below 2.5V; or the FS#
input being driven low by events on the secondary side of
the DC/DC controller. If one of these events occurs the
SMH4802 can be configured so VGATE shuts off and
either latches into an off state or recycles power after a
cooling down period, t
CYC
.
Figure 2. Functional Block diagram.
Pin numbers reflect SOIC package.
PROGRAMMED
DELAY
PROGRAMM-
ABLE
DELAY
+
–
+
–
+
–
PROGRAMMED
Quick-Trip
50mV
DUTY
CYCLE
TIMER
+
–
+
–
5V
2.5V
12V
VGATE
SENSE
+
–
VDD
VSS
CBSENSE
EN/TS
SCL
SDA
UV
OV
PG#
DRAIN
SENSE
VGATE
5.0VREF
12VREF
2062 BD
PROGRAMMABLE
SHUTDOWN
TIMER
FS#
14
3
1
5
9
7
4
8
6
2
11
12
10
200k
I2C INTERFACE
LOGIC
50k
50k
PROGRAMM-
ABLE
DELAY
OV/UV
FILTER
Prog.
Ref.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SMH4802_09 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Programmable -48V Hot-Swap Controller with Forced Shut Down |
| SMH4803 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Distributed Power Hot-Swap Controller |
| SMH4803A | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Distributed Power Hot Swap Controller |
| SMH4803AEK | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Distributed Power Hot-Swap Controller |
| SMH4803AEKP | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Distributed Power Hot-Swap Controller |
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