Data Sheet

Input Reverse Polarity Protection
Input Range and Transient Ability
Input Under-Voltage Protection
Inrush Current
There is a MOSFET connected in series to the negative input line. If the input polarity is connected reversely, the MOSFET opens and there will be no output to protect
the unit.
The series has a wide range input capability. Within 30% of rated input voltage, it can be executed at full-load operation and operate properly; with 40% of rated input ± ±
voltage, it can withstand that for 1 second.
If input voltage drops below Vimin, the internal control IC shuts down and there is no output voltage. It recovers automatically when input voltage reaches above Vimin,
please refer to the cruve below.
Inrush current is suppressed by a resistor during the initial start-up, and then the resistor is bypassed by a MOSFET to reduce power consumption after accomplishing
the start-up.
TIME
TIME
TIME
TIME
TIME
TIME
300W Railway Single Output DC-DC Converter
RSD-300
seri e s
File Name:RSD-300-SPEC 2014-10-08
Hold-up Time
D and F and E-5 types are in compliance with S2 level, while B and C and E types are in compliance with S1 level at full load output condition.
To fulfil the requirements of S2 level, B and C and E types require de-rating their output load to 70%, please refer to the curve diagrams below.
RSD-300B-24
RSD-300E-24
RSD-300B-48
RSD-300B-12
RSD-300C-24
RSD-300F-24
RSD-300C-5
RSD-300B-24
RSD-300D-24
RSD-300C-12
100%
RSD-300B-5
20.9
18.6
0
5
10
15
20
25
30
17 19 21 23 25 27 29
Turn On
Turn Off
Vo
Vo
Vo
Vo
Vin
13.5
12
0
5
10
15
20
25
30
11 12 13 14 15 16 17
Turn On
Turn Off
25.824.2
30
0
5
10
15
20
25
30
23 25 27 29 31 33 35
Turn On
Turn Off
56.2
53.5
0
5
10
15
20
25
30
50 55 60 65 70
Turn On
Turn Off
41.8
39.1
0
5
10
15
20
25
30
37 39 41 43 45 47 49
Turn On
Turn Off
Vin
Vin VinVin
Vo
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
10 0 %
0ms 10ms 20m s 30ms 40m s 50ms 60m s 70ms 80m s
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
10 0 %
0m s 10ms 20m s 30m s 40m s 50m s 60m s 70m s 80m s
0%
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40 %
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60 %
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80 %
90 %
10 0 %
0m s 10m s 20m s 30m s 40m s 50m s 60m s 70ms 80ms 90ms
0%
10 %
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30 %
40 %
50 %
60 %
70 %
80 %
90 %
10 0 %
0ms 10m s 20ms 30ms 40ms 50ms 60ms 70ms 80ms
0%
10 %
20 %
30 %
40 %
50 %
60 %
70 %
80 %
90 %
10 0 %
0ms 10m s 20m s 30ms 40ms 50ms 60m s 70ms 80m s
0%
10 %
20 %
30 %
40 %
50 %
60 %
70 %
80 %
90 %
10 0 %
0ms 10 ms 20 ms 30 ms 40 ms 50 ms 60 ms 70 ms 80 ms 90 ms