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RDH30072WS48 Datasheet(PDF) 4 Page - XP Power Limited

Part No. RDH30072WS48
Description  DC-DC Converter 300 Watts
Download  6 Pages
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Manufacturer  XPPOWER [XP Power Limited]
Direct Link  http://www.xppower.com
Logo XPPOWER - XP Power Limited

RDH30072WS48 Datasheet(HTML) 4 Page - XP Power Limited

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RDH300 Series
www.xppower.com
4
DC-DC Converter
Application Notes
Input Fusing and Safety Considerations
The RDH300 series converters have no internal fuse. In
order to achieve maximum safety and system
protection, always use an input line fuse. We
recommended a 10 A time delay fuse. It is
recommended that the circuit has a transient voltage
suppressor diode (TVS) across the input terminals to
protect the unit against surge or spike voltages and
input reverse voltage (as shown). A suitable part would
be 1.5 KE180 A Littlefuse.
Output Voltage Adjustment
The Trim input permits the user to adjust the output
voltage up by 10% or down by 10%. This is
accomplished by connecting an external resistor
between the Trim pin and either the +Sense pin or the
-Sense pin.
To Trim Down
Connecting an external resistor (Rd) between the Trim pin and the
+Sense pin decreases the output voltage. The following table can be
used to determine the required external resistor value to obtain a
percentage output voltage change of Δ%.
-Vin
+Vin
1
+Vout
+Sense
Trim
-Sense
-Vout
9
8
7
6
5
4
Vin
TVS
+
-
Load
Trim down Rd
Trim up Ru
Fuse
To Trim Up
Connecting an external resistor (Ru) between the Trim pin and the
-Sense pin increases the output voltage. The following table can be used
to determine the required external resistor value to obtain a
percentage output voltage change of Δ%.
Trim Down
%
5 V
12 V
24 V
28 V
48 V
Rd (k
Ω)
1
110.4
660.3
1671
1984
3106
2
52.38
300.1
775.8
905.5
1400
3
33.05
180.0
477.2
545.8
831.5
4
23.38
120.0
327.9
365.9
547.1
5
17.58
83.98
238.3
258.0
376.5
6
13.71
59.97
178.6
186.0
262.8
7
10.95
42.82
136.0
134.6
181.5
8
8.880
29.95
104.0
96.10
120.6
9
7.269
19.95
79.07
66.12
73.17
10
5.980
11.94
59.17
42.14
35.25
Trim Up %
5 V
12 V
24 V
28 V
48 V
Ru (k
Ω)
1
112.7
153.2
165.7
168.3
148.6
2
54.70
74.30
79.36
81.16
71.81
3
35.37
47.99
50.58
52.12
46.21
4
25.70
34.83
36.19
37.60
33.40
5
19.90
26.94
27.56
28.86
25.72
6
16.03
21.68
21.80
23.08
20.60
7
13.27
17.92
17.69
18.93
16.94
8
11.20
15.10
14.61
15.82
14.20
9
9.589
12.91
12.21
13.40
12.07
10
8.300
11.15
10.29
11.47
10.36


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