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参数资料
| 型号： | 5962-9462601HXX |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 2/12页 |
| 文件大小： | 97K |
| 代理商： | 5962-9462601HXX |
10
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ATR28XXS Series
Connecting the inhibit input (Pin 2) to input common (Pin 10)
will cause the converter to shut down. It is recommended
that the inhibit pin be driven by an open collector device
capable of sinking at least 400A of current. The open cir-
cuit voltage of the inhibit input is 11.5 ±1 VDC.
Assuming that there is no forced air flow, the package
temperature rise above ambient (
T) may be calculated
using the following expression:
where A = the effective surface area in square inches
(Including heat sink if used),P
d
= power dissipation in watts.
The total surface area of the ATR package is 7.34 square
inches. If a worse case full load efficiency of 76% is as-
sumed, then the case temperature rise of an ATR2805S
can be calculated as follows:
Hence, if T
AMBIENT
= +25
°C, the DC/DC converter case
temperature will be approximately 159
°C if no heat sink
or air flow is provided.
ATR28XXS Block Diagram
Application Information
Inhibit Function
Thermal Management
To calculate the heat sink area required to maintain a
specific case temperature rise, the above equation may
be manipulated as follows:
PKG
d
HEATSINK
A
P
T
A
=
43
1
85
0
80
.
As an example, if a maximum case temperature rise of
50
°C above ambient is required, then the required
effective heat sink area is:
EMI Filter
An Optional EMI filter (AFC461)is available that will reduce
the input ripple current to levels below the limits imposed by
MIL-STD-461B CEO3.
Whenever multiple DC/DC converters are utilized in a single
system, significant low frequency noise may be generated
due to slight difference in the switching frequencies of the
converters. Because of the low frequency nature of this
noise (typically less than 10KHz), it is difficult to filter out
and may interfere with proper operation of sensitive sys-
tems. Advanced Analog permits synchronization of multiple
ATR28XX converters to match switching frequency of the
converter to the frequency of the system clock, thus elimi-
nating this type of noise.
Device Synchronization
W
Eff
P
out
5
9
1
76
1
30
1
.
=
=
=
T = 80 A –0.7 P 0.85 (°C)
T = 80 (7.34)-0.7 (9.5)0.85 = 134°C
()
2
43
1
85
0
9
22
34
7
5
9
80
50
in
AHEATSINK
.
=
=
Output Voltage Adjustment
The output voltage of the ATR2805S converter can be ad-
justed upward by connecting an appropriate resistor value
between the Positive Output (Pin 5) and the Positive Sense
(Pin 6) as shown in Table 1 below.
Resistance Pin 5 to 6 (
)
Output Voltage Increase (V)
109
0.1
240
0.2
400
0.3
600
0.4
857
0.5
1200
0.6
Table1 Output adjustment resistor values for ATR2805S
5
4
+V o ut
Re turn
Pu ls e W id th
Mo du la tor
Prim a ry
H o us ekeeping
Su pp ly
EM I
Filter
1
10
+ In put
En ab le
Sy nc
Inp ut
Re turn
E rror
Am p &
Re f
+S e ns e
-S e ns e
FB
CS
Driv e
Ca se
6
3
9
8
2
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