參數(shù)資料
型號(hào)： SMH4803A
廠商： Summit Microelectronics, Inc.
元件分類(lèi)： 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)： 12/19頁(yè)
文件大?。?/td> 436K
代理商： SMH4803A
12
SMH4803A
2051 4.4 3/15/01
Preliminary
SUMMIT MICROELECTRONICS, Inc.
tions, but must not allow the maximum supply current to be
exceeded under maximum supply voltage conditions.
The dropper resistor value is calculated from:
MAX
MIN
DD
D
DD
I
LOAD
I
VS
V
R
=
+
,
where VS
MIN
is the lowest operating supply voltage,
V
DDMAX
is the upper limit of the SMH4803A supply voltage,
I
DD
is minimum current required for the SMH4803A to
operate, and I
LOAD
is any additional load current from the
2.5V and 5V outputs and between V
DD
and V
SS
.
The min/max current limits are easily met using the drop-
per resistor, except in circumstances where the input
voltage may swing over a very wide range (e.g. input
varies between 20V and 100V). In these circumstances it
may be necessary to add an 11V zener diode between
V
DD
and V
SS
to handle the wide current range. The zener
voltage should be below the nominal regulation voltage of
the SMH4803A so that it becomes the primary regulator.
MOSFET V
DS
(ON) Threshold
The drain sense input on the SMH4803A monitors the
voltage at the drain of the external power MOSFET switch
with respect to V
SS
. When the MOSFET
’
s V
DS
is below the
user-defined threshold the MOSFET switch is considered
to be ON. The V
DS
(ON)
THRESHOLD
is adjusted using the
resistor, R
T
, in series with the drain sense protection
diode. This protection, or blocking, diode prevents high
voltage breakdown of the drain sense input when the
MOSFET switch is OFF. A low leakage MMBD1401 diode
offers protection up to 100V. For high voltage applications
(up to 500V) the Central Semiconductor CMR1F-10M
diode should be used. The V
DS
(ON)
THRESHOLD
is calcu-
lated from:
(
)
(
)
DS
SENSE
V
SENSE
I
T
DIODE
V
THRESHOLD
V
ON
R
=
×
,
where V
DIODE
is the forward voltage drop of the protection
diode. The V
DS
(ON)
THRESHOLD
varies over temperature
due to the temperature dependence of V
DIODE
and I
SENSE
.
The calculation below gives the V
DS
(ON)
THRESHOLD
under
the worst case condition of 85
°
C ambient. Using a 68k
resistor for R
T
gives:
(
)
(
DS
THRESHOLD
V
ON
2.5V
15 A 68k
0.5V
1V
=
=
.
The voltage drop across the MOSFET switch and sense
resistor, V
DSS
, is calculated from:
)
DSS
V
S
ON
I R
R
=
+
,
where I
D
is the MOSFET drain current, R
S
is the circuit
breaker sense resistor, and R
ON
is the MOSFET on
resistance.
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