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參數(shù)資料
| 型號(hào)： | SMH4811A |
| 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 |
| 中文描述： | 分布式電源熱插拔控制器 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大小： | 358K |
| 代理商： | SMH4811A |
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3
2044 6.1 2/8/01
SMH4811A
Preliminary
SUMMIT MICROELECTRONICS, Inc.
PIN DESCRIPTIONS
DRAIN SENSE (1)
The DRAIN SENSE input monitors the voltage at the drain
of the external power MOSFET switch with respect to V
SS
.
An internal 10μA source pulls the DRAIN SENSE signal
towards the 5V reference level. DRAIN SENSE must be
held below 2.5V to enable the PG outputs.
VGATE (2)
The VGATE output activates an external power MOSFET
switch. This signal supplies a constant current output
(100μA typical), which allows easy adjustment of the
MOSFET turn on slew rate.
EN/TS (3)
The Enable/Temperature Sense input is the master en-
able input. If EN/TS is less than 2.5V, VGATE will be
disabled. This pin has an internal 200k
pull-up to 5V.
PD1# and PD2# (4 & 5)
These are logic level active low inputs that can optionally
be employed to enable VGATE and the PG outputs when
they are at V
SS
. These pins each have an internal 50k
pull-up to 5V.
FAULT# (6)
This is an open-drain, active-low output that indicates the
fault status of the device.
CBSENSE (7)
The circuit breaker sense input is used to detect over-
current conditions across an external, low value sense
resistor (R
S
) tied in series with the Power MOSFET. A
voltage drop of greater than 50mV across the resistor for
longer than t
CBD
will trip the circuit breaker. A program-
mable Quick-Trip
sense point is also available.
UV (9)
The UV pin is used as an under-voltage supply monitor,
typically in conjunction with an external resistor ladder.
VGATE will be disabled if UV is less than 2.5V. Program-
mable internal hysteresis is available on the UV input,
adjustable in increments of 62.5mV. Also available is a
filter delay on the UV input.
OV (10)
The OV pin is used as an over-voltage supply monitor,
typically in conjunction with an external resistor ladder.
VGATE will be disabled if OV is greater than 2.5V. A filter
delay is available on the OV input.
5.0VREF & 2.5VREF (11 & 12)
These are precision 5V and 2.5V output reference volt-
ages that may be use to expand the logic input functions
on the SMH4803A. The reference outputs are with re-
spect to V
SS
.
ENPG (14)
This is an active high input that controls the PG# output.
When ENPG is pulled low the PG# output is immediately
placed in a high impedance state. This pin has an internal
50k
pull-up to 5V.
PG# (15)
The PG# pin is an open-drain, active-low output with no
internal pull-up resistor. It can be used to switch a load or
enable a DC/DC converter. PG# is enabled immediately
after VGATE reaches V
DD
–
V
GT
and the DRAIN SENSE
voltage is less than 2.5V. Voltage on these pins cannot
exceed 12V, as referenced to V
SS.
V
DD
(16)
V
DD
is the positive supply connection. An internal shunt
regulator limits the voltage on this pin to approximately
12V with respect to VSS. A resistor must be placed in
series with the V
DD
pin to limit the regulator current (R
D
in
the application illustrations).
V
SS
(8)
V
SS
is connected to the negative side of the supply.
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