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參數(shù)資料
| 型號： | AFL27005D |
| 英文描述： | Hi-Rel DC-DC Standard Dual Converter in a AFL package |
| 中文描述： | 高可靠性的DC - DC標(biāo)準(zhǔn)在冬季兩項(xiàng)包雙轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 137K |
| 代理商： | AFL27005D |
8
temperature will also be shared. Thus if one
member of a paralleled set is operating at a higher
case temperature, the current it provides to the load
will
be
reduced
as
temperature induced stress on that device.
compensation
for
the
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
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.
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 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 od Sil-PadR 400
1
. 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 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 (
A
maximum case temperature rise
(
T) above
ambient temperature is given by the following
expression:
HEAT
SINK
) required to set the
0
80
A
43
.
85
.
SINK
HEAT
≈
P
T
where
T
P
P
Eff
OUT
=
=
Case temperature rise above ambient
Device dissipation in Watts
1
1
As an example, it is desired to maintain the case
temperature of an AFL27015S at
≤
+85°C in an area
where the ambient temperature 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 0205
2. W
.
and the required heat sink area is
A
=
60
80 24.6
in
HEAT SINK
0.85
143
.
2
30 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 aluminum 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 environment. Note that to meet the criteria in
this example, both sides of the plate require
unrestricted exposure to the ambient air.
1 Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AFL27028DW | DC to DC Converter |
| AFL27012D | Hi-Rel DC-DC Standard Dual Converter in a AFL package |
| AFL27015D | Hi-Rel DC-DC Standard Dual Converter in a AFL package |
| AFL27028DX | DC to DC Converter |
| AFL27028DY | DC to DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AFL27005DW | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, MINIMUM SCREENING - Bulk |
| AFL27005DW/CH | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, CLASS H - Bulk |
| AFL27005DW/ES | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, ENVIRONMENTAL SCREENING - Bulk |
| AFL27005DW/HB | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, CLASS H EQUIVALENT, NO ELEM EVAL - Bulk |
| AFL27005DWCH | 制造商:IRF 制造商全稱:International Rectifier 功能描述:270V Input, Single Output |
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