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AFL2812DWCH Datasheet(PDF) 7 Page - International Rectifier

Part # AFL2812DWCH
Description  HYBRID-HIGH RELIABILITY DC/DC CONVERTER
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

AFL2812DWCH Datasheet(HTML) 7 Page - International Rectifier

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7
AFL50XXD Series
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
085
143
.
.
.
where
∆T
PP
Eff
OUT
=
==
Case temperature rise above ambient
Device dissipation in Watts
1
1
T = 85 - 25 = 60°C
and the required heat sink area is
If the worst case full load efficiency for this device is 83% @
100W; then the power dissipation at full load is given by
Because of the incorporation of many innovative
technological 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
appropriate heat dissipater held in intimate contact with the
converter base-plate.
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 return 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.
For 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. Note that the current
we refer to here is the total device output current, that is, the
sum of the positive and negative output currents.
1Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN
Thermal Considerations
Since the 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 transferring
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-Pad
®
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 compensating for any minor surface variations. While
other available types of heat conductive materials and thermal
compounds provide similareffectiveness, these alternatives are
often less convenient and can be somewhat messy to use.
As an example, it is desired to maintain the case temperature
of an AFL5015D at
≤ +85°C while operating in an open area
whose ambient temperature is held at a constant +25°C;
then
Thus, a total heat sink surface area (including fins, if any) of
56 in2 in this example, would limit case rise to 60°C above
ambient. A flat aluminum plate, 0.25" thick and of approximate
dimension 4" by 7" (28 in2 per side) would suffice for this
application in a still air environment. Note that to meet the
criteria in this example, both sides of the plate require
unrestricted exposure to the +25°C ambient air.
()
P
=•
=•
=
100
1
83
1
100 0 205
20 5
.
.. W
A
=
60
80 20.5
in
HEAT SINK
0.85
−=
−143
2
30 56 3
.
..


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