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參數(shù)資料
| 型號(hào)： | AFL12003.3SY/HB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 66 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 241K |
| 代理商： | AFL12003.3SY/HB |
8
ture induced stress on that device.
When operating in the shared mode, it is important that
symmetry of connection be maintained as an assurance of
optimum load sharing performance.
Thus, converter
outputs should be connected to the load with equal lengths
of wire of the same gauge and sense leads from each
converter should be connected to a common physical point,
preferably at the load along with the converter output and
return leads. All converters in a paralleled set must have
their share pins connected together. This arrangement is
diagrammatically illustrated in Figure III. showing the
outputs and sense pins connected at a star point which is
located close as possible to the load.
As a consequence of the topology utilized in the current
sharing circuit, the share pin may be used for other
functions. In applications requiring only a single converter,
the voltage appearing on the share pin may be used as a
“current monitor”. The share pin open circuit voltage is
nominally +1.00v at no load and increases linearly with
increasing output current to +2.20v at full load.
Thermal Considerations
Because of the incorporation of many innovative techno-
logical concepts, the AFL series of converters is capable of
providing very high output power from a package of very
small volume. These magnitudes of power density can only
be obtained by combining high circuit efficiency with
effective methods of heat removal from the die junctions.
This requirement has been effectively addressed inside the
device; but when operating at maximum loads, a significant
amount of heat will be generated and this heat must be
conducted away from the case.
To maintain the case
temperature at or below the specified maximum of 125°C,
this heat must be transferred by conduction to an appropri-
ate heat dissipater held in intimate contact with the converter
base-plate.
Because effectiveness of this heat transfer is dependent on
the intimacy of the baseplate-heatsink interface, it is strongly
recommended that a high thermal conductivity heat trans-
ferring medium is inserted between the baseplate and
heatsink.
The material most frequently utilized at the
factory during all testing and burn-in processes is sold
under the trade name of Sil-PadR 4001 . This particular
product is an insulator but electrically conductive versions
are also available. Use of these materials assures maximum
surface contact with the heat dissipater thereby compensat-
ing for any minor surface variations. While other available
types of heat conductive materials and thermal compounds
provide similar effectiveness, these alternatives are often
less convenient and are frequently 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 HEAT SINK
≈
T
P
80
30
0 85
143
.
where
T
PP
Eff
OUT
=
Case temperature rise above ambient
Device dissipation in Watts
1
As an example, it is desired to maintain the case
temperature of an AFL2815S at
≤ +85°C while
operating in an open area whose ambient tempera-
ture is held at a constant +25°C; then
T = 85 - 25 = 60°C.
From the Specification Table, the worst case full
load efficiency for this device is 83%; therefore the
power dissipation at full load is given by
()
P
=
=
120
1
83
1
120
0 205
24 6
.
. W
and the required heat sink area is
A
=
60
80 24.6
in
HEAT SINK
0.85
=
143
2
3 0
71
.
Thus, a total heat sink surface area (including
fins, if any) of 71 in
2
in this example, would limit
case rise to 60°C above ambient. A flat alumi-
num plate, 0.25" thick and of approximate
dimension 4" by 9" (36 in
2
per side) would
suffice for this application in a still air environ-
ment. Note that to meet the criteria in this
example, both sides of the plate require unre-
stricted exposure to the ambient air.
Input Filter
The AFL2800S series converters incorporate a two
stage LC input filter whose elements dominate the
input load impedance characteristic at turn-on. The
input circuit is as shown in Figure IV.
1Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN
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