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參數(shù)資料
| 型號： | ARH2805.2S/SF |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | LOW PROFILE, HERMETIC SEALED, RUGGED PACKAGE-12 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 118K |
| 代理商： | ARH2805.2S/SF |
10
Effectiveness of this heat transfer is dependent on
the intimacy of the baseplate/heatsink interface. It
is therefore suggested that a heat transferring
medium possessing good thermal conductivity be
inserted between the baseplate and heatsink.
A
material utilized at the factory during testing and
burn-in processes is sold under the trade name of
Sil-Pad 4001.
This particular product is an
insulator but electrically conductive versions are
also available.
Use of these materials assures
optimum surface contact with the heat dissipater by
compensating for minor surface variations.
While
other available types of heat conducting materials
and
thermal
compounds
provide
similar
effectiveness, these alternatives are often less
convenient and are sometimes messy to use.
A conservative aid to estimating the total heat sink
surface area (AHEAT SINK) required to set the maximum
case
temperature
rise
(
T) above ambient
temperature is given by the following expression:
A HEATSINK
≈
T
P
80
5 94
0 85
1 43
.
where
T
P
Eff
OUT
=
Case temperature rise above ambient
Device dissipation in Watts
1
As an example, assume that it is desired to maintain
the case temperature of an ARH2815S at +65°C or
less while operating in an open area whose ambient
temperature does not exceed +35°C; then
T = 65 - 35 = 35°C.
From the Specification Table, the worst case full
load efficiency for this device is 80%; therefore the
maximum power dissipation at full load is given by
( )
P
=
=
=
30
1
80
1
30
0 25
7 5
.
. W
and the required heat sink area is
A
=
35
80 7.5
in
HEAT SINK
0.85
=
1 43
2
5 94
318
.
Thus, a total heat sink surface area (including fins, if
any) of approximately 32 in2 in this example, would
limit case rise to 35°C above ambient.
A flat
1
Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN
aluminum plate, 0.25" thick and of approximate
dimension 4" by 4" (16 in2 per side) would suffice for
this application in a still air environment. Note that
to meet the criteria, both sides of the plate require
unrestricted exposure to the ambient air.
Inhibiting Converter Output
As an alternative to application and removal of the
DC voltage to the input, the user can control the
converter output by providing an input referenced,
TTL compatible, logic signal to the enable pin 3.
This port is internally pulled "high" so that when not
used, an open connection on the pin permits normal
converter operation.
When inhibited outputs are
desired, a logical "low" on this port will shut the
converter down. An open collector device capable
of sinking at least 100 A connected to enable pin 3
will work well in this application.
A benefit of utilization of the enable input is that
following initial charge of the input capacitor,
subsequent
turn-on
commands
will
induce
no
uncontrolled current inrush.
Figure II. Enable Input Equivalent Circuit
5K
2N2907A
150K
Enable
Input
Return
150K
2N2222A
V
in
64K
150K
100K
5.6 V
Converter inhibit is initiated when
this transistor is turned off
Synchronization
When
using
multiple
converters,
system
requirements
may
dictate
operating
several
converters at a common system frequency.
To
accommodate this requirement, the ARH2800S type
converter provides a synchronization input port.
The sync input port permits synchronization of an
ART converter to any compatible external frequency
source operating in the band of 225 to 310 KHz. In
the event of failure of an external synchronization
source, the converter will revert to its own internally
set frequency. When external synchronization is not
desired, the sync in port may be left open
(unconnected) permitting the converter to operate at
its' own internally set frequency.
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