RDH300 Series
300 Watts
• Wide 4:1 Input Range
• 72 & 110 VDC Nominal Inputs for Rail Applications
• Complies with EN50155
• Meets EN50121-3-2
• Single Output
• Industry Standard 1/2 Brick
• -40 °C to +100 °C Operation
• 3000 VDC Isolation
• Output Trim ±10%
• Remote On/Off and Remote Sense
• 3 Year Warranty
DC-DC Converter
xxx Series
Dimensions:
RDH300:
2.4 x 2.28 x 0.5” (61.0 x 57.9 x 12.7 mm)
Models & Ratings
Input
Voltage
Output
Voltage
5V
12 V
43-160 V
24 V
28 V
48 V
Output Current
60.00 A
25.00 A
12.50 A
10.70 A
6.25 A
Input Current
No Load
10 mA
10 mA
10 mA
10 mA
10 mA
Full Load
3.100 A
3.030 A
3.064 A
3.064 A
3.064 A
Ripple &
noise
(1)
120 mV
150 mV
240 mV
280 mV
480 mV
Efficiency
(2)
88%
90%
89%
89%
89%
Max. capacitive
load
10000 µF
8800 µF
4700 µF
3300 µF
2200 µF
Model Number
RDH30072WS05
RDH30072WS12
RDH30072WS24
RDH30072WS28
RDH30072WS48
Notes
1. Measured at 20 MHz bandwidth pk-pk, full load, 10 µF aluminum solid and 1.0 µF
ceramic capacitors.(5 V uses 47 µF polymer tantalum and 10 µF ceramic
capacitor)
2. Measured at 110 V input and full load.
Mechanical Details
0.18 min
(4.6)
Mounting holes
0.126 (3.2) clearance 4pl.
BOTTOM VIEW
0.50
(12.7)
4
3
1.400
(35.56)
0.600
(15.24)
2.40
(61.0)
2.00
(50.8)
5
6
7
(2.03)
2
1
8
9
(1.02)
Pin
1
2
3
4
5
6
7
8
9
Notes
Pin Connections
Single
+Vin
Remote On/Off
No Pin
-Vin
-Vout
-Sense
Trim
+Sense
+Vout
1.90
(48.3)
2.28
(57.9)
1. All dimensions are in inches (mm)
2. Weight: 0.25lbs (114 g) approx.
3. Tolerance: x.xx = ±0.02 (x.x = ±0.5)
x.xxx = ±0.01 (x.xx = ±0.25)
1
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RDH300 Series
Input
Characteristic
Input Voltage Range
Input Surge
Undervoltage Lockout
Lockout Hysteresis
Idle Current
Inrush Current
Input Reflected Ripple Current
Recommended Input Fuse
T10.0A
40
On: >40 V
Off: <37 V
42
39
1
3
5
0.1
Minimum
43
Typical
Maximum
160
200
43
40
DC-DC Converter
Units
VDC
VDC for 100 ms
VDC
VDC
mA
A
2
s
mA pk-pk
Notes & Conditions
72/110 V nominal inputs
On
Off
When output is inhibited
Through 12 µH inductor
Output
Characteristic
Output Voltage
Output Trim
Initial Set Accuracy
Minimum Load
Line Regulation
Load Regulation
Transient Response
Start Up Time
Output Voltage Rise Time
Ripple & Noise
Overload Protection
Short Circuit Protection
Maximum Capacitive Load
Temperature Coefficient
Overvoltage Protection
Remote On/Off
115
125
0.02
140
%/ ˚C
%
110
125
160
35
15
0
±0.2
±0.2
±5.0
Minimum
5
±10
±1.0
Typical
Maximum
48
Units
VDC
%
%
%
%
%
%
ms
ms
mV pk-pk
%
Continuous hiccup mode, with auto recovery
See Models and Ratings table
See models and ratings table
Notes & Conditions
See Models and Ratings table
See Application Note
At full load and 110 V input
No minimum load required
From minimum to maximum input at full load
From 0% to full load
Maximum deviation, recovering to less than 1% in
250 µs for 25% step load change.
Output is on if remote on/off (pin 2) is open or high (3.5-160 VDC)
Output turns off if remote on/off (pin 2) is low (<1.2 VDC max)
General
Characteristic
Efficiency
Isolation: Input to Output
Isolation: Input to Case
Isolation: Output to Case
Isolation Resistance
Isolation Capacitance
Switching Frequency
Power Density
Mean Time Between Failure
Weight
600
900
0.25 (114.0)
270
3000
3000
500
10
8
Minimum
Typical
89
Maximum
Units
%
VDC
VDC
VAC
pF
kHz
W/in
3
kHrs
lb (g)
Ω
Notes & Conditions
See Models and Ratings table
60 s
60 s
60 s
Input to output
Fixed
5, 12, 24 & 28 V MIL-HDBK-217F, +25 °C GB
48 V MIL-HDBK-217F, +25 °C GB
3000
300
330
109
Environmental
Characteristic
Operating Base Plate Temperature
Storage Temperature
Thermal Protection
Humidity
Cooling
Minimum
-40
-55
+110
95
Typical
Maximum
+100
+125
Units
°C
°C
°C
%RH
Measured on baseplate
Non-condensing
Base plate cooled
Notes & Conditions
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2
RDH300 Series
Safety Approvals
Agency
UL
EN
Standard
cUL60950-1
EN50155
Test Level
DC-DC Converter
Notes & Conditions
ITE
Railway
EMC: Emissions
Phenomenon
Conducted
Radiated
Standard
EN50121-3-2
EN50121-3-2
Test Level
Notes & Conditions
See Application Notes
See Application Notes
EMC: Immunity
Phenomenon
Railway Equipment
ESD Immunity
Radiated Immunity
EFT/Burst
Surge
Conducted Immunity
Standard
EN50121-3-2
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-5
EN61000-4-6
±6 kV/±8 kV
20 V/m
2 kV
±4 kV/±2 kV
10 V rms
A
A
A
A
A
External capacitor required such as
Rubycon 4XF Series, 220 µF/200V
L-E/L-L, External TVS, 1.5 KE 180 A Littlefuse
Test Level
Criteria
Notes & Conditions
See Application Notes
Contact Discharge/Air Discharge
Mechanical Details
0.18 min
(4.6)
Mounting holes
0.126 (3.2) clearance 4pl.
BOTTOM VIEW
0.50
(12.7)
4
3
1.400
(35.56)
0.600
(15.24)
2.40
(61.0)
2.00
(50.8)
5
6
7
(2.03)
2
1
8
9
(1.02)
Pin Connections
Pin
Single
1
+Vin
2
Remote On/Off
3
No Pin
4
-Vin
5
-Vout
6
-Sense
7
Trim
8
+Sense
9
+Vout
1.90
(48.3)
2.28
(57.9)
Notes
1. All dimensions are in inches (mm)
2. Weight: 0.25 lbs (114 g) approx.
3. Tolerance: x.xx = ±0.02 (x.x = ±0.5)
x.xxx = ±0.01 (x.xx = ±0.25)
3
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RDH300 Series
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.
DC-DC Converter
Fuse
1
+Vin
+Vout
+Sense
9
8
7
6
5
Trim down Rd
Load
Trim up Ru
+
-
Vin
TVS
-Vin
Trim
-Sense
4
-Vout
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%.
Trim Down
%
1
2
3
4
5
6
7
8
9
10
5V
110.4
52.38
33.05
23.38
17.58
13.71
10.95
8.880
7.269
5.980
12 V
660.3
300.1
180.0
120.0
83.98
59.97
42.82
29.95
19.95
11.94
24 V
Rd (kΩ)
1671
775.8
477.2
327.9
238.3
178.6
136.0
104.0
79.07
59.17
28 V
1984
905.5
545.8
365.9
258.0
186.0
134.6
96.10
66.12
42.14
48 V
3106
1400
831.5
547.1
376.5
262.8
181.5
120.6
73.17
35.25
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 Up %
1
2
3
4
5
6
7
8
9
10
5V
112.7
54.70
35.37
25.70
19.90
16.03
13.27
11.20
9.589
8.300
12 V
153.2
74.30
47.99
34.83
26.94
21.68
17.92
15.10
12.91
11.15
24 V
Ru (kΩ)
165.7
79.36
50.58
36.19
27.56
21.80
17.69
14.61
12.21
10.29
28 V
168.3
81.16
52.12
37.60
28.86
23.08
18.93
15.82
13.40
11.47
48 V
148.6
71.81
46.21
33.40
25.72
20.60
16.94
14.20
12.07
10.36
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4
RDH300 Series
Application Notes
Thermal Resistance Information
DC-DC Converter
Power Dissipated vs Ambient Temperature and Air Flow
Power Disspated ,Pd(Watts)
Natural Convection
20 ft./min. (0.1 m/s)
100 ft./min. (0.5 m/s)
200 ft./min. (1.0 m/s)
300 ft./min. (1.5 m/s)
400 ft./min. (2.0 m/s)
500 ft./min. (2.5 m/s)
600 ft./min. (3.0 m/s)
700 ft./min. (3.5 m/s)
800 ft./min. (4.0 m/s)
Ambient Temperature ,Ta(Deg. C)
Air Flow Rate
Natural Convection 20 ft/min (0.1 m/s)
100 ft/min (0.5 m/s)
200 ft/min (1.0 m/s)
300 ft/min (1.5 m/s)
400 ft/min (2.0 m/s)
500 ft/min (2.5 m/s)
600 ft/min (2.5 m/s)
700 ft/min (2.5 m/s)
800 ft/min (2.5 m/s)
Typical Rca
7.12 °C/W
6.21 °C/W
5.17 °C/W
4.29 °C/W
3.64 °C/W
2.96 °C/W
2.53 °C/W
2.37 °C/W
2.19 °C/W
Airflow Derating Graph
Example (Without Heatsink)
To determine the minimum airflow necessary for a RDH30072WS24 operating at an input voltage of 72 V, an output current of 12.5 A, and a
maximum
ambient temperature of 20°C:
Determine Power dissipation (Pd):
Pd = Pi-Po = Po(1-η)/η,
Pd =24 V× 12.5 A×(1-0.894)/0.894 = 35.57 Watts
Determine airflow from airflow derating graph using data points for Pd=35.57 W and Ta = 20 °C
Minimum airflow= 800 ft./min.
To check that the maximum case temp of 100 °C is not exceeded:
Maximum temperature rise is
ΔT = Pd × Rca=35.57×2.19=77.9°C.
Maximum case temperature is
Tc=Ta+ΔT=97.9°C <100°C.
Where: Rca is the thermal resistance from case to ambient environment. Ta is ambient temperature and Tc is case temperature.
Where Pi = Input power, Po = Output Power and
η
= Efficiency
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