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參數資料
| 型號： | AHF2812D |
| 廠商： | International Rectifier |
| 英文描述： | 28V Input, Single and Dual Output |
| 中文描述： | 28V輸入，單路和雙路輸出 |
| 文件頁數： | 15/17頁 |
| 文件大?。?/td> | 148K |
| 代理商： | AHF2812D |
www.irf.com
15
AHF28XX Series
Application Information
Connecting the enable input (Pin 1) to input common (Pin 7)
will cause the converter to shut down. It is recommended
that the enable pin be driven by an open collector device
capable of sinking at least 400 μA of current. The open
circuit voltage of the enable input is 15 ±1 VDC. If the inhibit
function is not used, this input can be left unconnected
because it is internally pulled-up.
Thermal Management
Assuming that there is no forced air flow, the package tem-
perature rise above ambient (
T) may be calculated using
the following expression:
where A = the effective surface area in square inches (in-
cluding heat sink if used), P = power dissipation in watts.
The total surface area of the AHF package is 4.9 square
inches. If a worse case full load efficiency of 78% is as-
sumed, then the case temperature rise can be calculated
as follows:
Hence, if T
= +25
°
C, the DC/DC converter case
temperature will be approximately 100
°
C if no heat sink
or air flow is provided.
Inhibit Function
T
≈
80 A
–0.7
p
0.85
(
°
C)
W
Eff
P
P
OUT
4
1
78
.
1
12
1
1
=
=
=
T = 80 (4.9)
-0.7
(3.4)
0.85
= 74
°
C
To calculate the heat sink area required to maintain a
specific case temperature rise, the above equation may
be manipulated as follows:
PKG
Α
Ρ
Τ
43
.
85
.
80
A
HEAT SINK
=
As an example, if a maximum case temperature rise of
50°C rise above ambient is desired, then the required
effective heat sink area is:
2
43
.
85
.
.
75
.
9
)
80
50
in
HEATSINK
=
=
Α
相關PDF資料 |
PDF描述 |
|---|---|
| AHF2812DF | Circular Connector; No. of Contacts:43; Series:MS27468; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:25-43 RoHS Compliant: No |
| AK04D300-SOT | 4 Pin to 14 Pin DIP Adapters |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AHF2812D/CH | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, CLASS H - Bulk |
| AHF2812D/ES | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, ENVIRONMENTAL SCREENING - Bulk |
| AHF2812D/ES-MSTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| AHF2812D/ES-SLV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| AHF2812D/HB | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, CLASS H EQUIVALENT, NO ELEM EVAL - Bulk |
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