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SMH4811A データシート(PDF) 11 Page - Summit Microelectronics, Inc.

部品番号 SMH4811A
部品情報  DISTRIBUTED POWER HOT SWAP CONTROLLER
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メーカー  SUMMIT [Summit Microelectronics, Inc.]
ホームページ  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMH4811A データシート(HTML) 11 Page - Summit Microelectronics, Inc.

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2044 6.1 2/8/01
SMH4811A
SUMMIT MICROELECTRONICS, Inc.
Preliminary
where VSMIN is the lowest operating supply voltage,
VDDMAX is the upper limit of the SMH4811A supply voltage,
IDD is minimum current required for the SMH4811A to
operate, and ILOAD is any additional load current from the
2.5V and 5V outputs and between VDD and VSS.
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
VDD and VSS to handle the wide current range. The zener
voltage should be below the nominal regulation voltage of
the SMH4811A so that it becomes the primary regulator.
MOSFET VDS(ON) Threshold
The drain sense input on the SMH4811A monitors the
voltage at the drain of the external power MOSFET switch
with respect to VSS. When the MOSFET’s VDS is below the
user-defined threshold the MOSFET switch is considered
to be ON. The VDS(ON)THRESHOLD is adjusted using the
resistor, RT, 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 VDS(ON)THRESHOLD is calcu-
lated from:
()
(
)
DS
SENSE
SENSE
T
DIODE
THRESHOLD
VON
V
I
R
V
=−
×
,
where VDIODE is the forward voltage drop of the protection
diode. The VDS(ON)THRESHOLD varies over temperature
due to the temperature dependence of VDIODE and ISENSE.
The calculation below gives the VDS(ON)THRESHOLD under
the worst case condition of 85°C ambient. Using a 68k
resistor for RT gives:
()
(
)
DS
THRESHOLD
V
ON
2.5V
15 A 68k
0.5V
1V
µ
=−
×
Ω −
=
.
The voltage drop across the MOSFET switch and sense
resistor, VDSS, is calculated from:
()
DSS
D
S
ON
VI R
R
=+
,
where ID is the MOSFET drain current, RS is the circuit
breaker sense resistor, and RON is the MOSFET on
resistance.
Note: Figures 5 through 8 — the *10
Ω resistor must be located as close as possible to the MOSFET


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