RDF50 Series
50 Watts
• Ultra Wide 12:1 Input Range (14-160 VDC)
• Single Output
• Industry Standard 1/4 Brick
• -40 °C to +100 °C Operation
• 3000 VDC Isolation
• Output Trim -20/+10%
• Remote On/Off and Remote Sense
• Complies with EN50155
• Meets EN50121-3-2
• 3 Year Warranty
DC-DC Converter
xxx Series
Dimensions:
RDF50:
1.45 x 2.28 x 0.5” (36.8 x 57.9 x 12.7 mm)
Models & Ratings
Input
Voltage
Output
Voltage
5V
14-160 VDC
12 V
24 V
48 V
Output Current
6.00 A
4.20 A
2.10 A
1.05 A
Input Current
(1)
No Load
5 mA
5 mA
5 mA
5 mA
Full Load
2.90 A
4.30 A
4.20 A
4.25 A
Ripple &
noise
(2)
100 mV
150 mV
240 mV
480 mV
Efficiency
(3)
83.0%
87.0%
89.0%
88.0%
Max. capacitive
load
4700 µF
3300 µF
1200 µF
680 µF
Model Number
RDF5072WS05
RDF5072WS12
RDF5072WS24
RDF5072WS48
Notes
1. Typical at 14 VDC input.
2. Measured at 20 MHz bandwidth and 10 µF electrolytic capacitor.
3. Measured at 72 VDC input.
Mechanical Details
2.28 (57.9)
2.00 (50.8)
Mounting Holes
0.126 (3.2) clearance 2pl
3
2
1
BOTTOM VIEW
4
5
6
7
8
1.45
(36.8)
1.03
(26.2)
0.60
(15.24)
0.60
(15.24)
0.30
(7.62)
1.86 (47.2)
0.040 (1.02)
Dia 6 places
0.059 (1.50)
Dia 2 places
0.16 min
(4.1)
Pin
1
2
3
4
5
6
7
8
Notes
Pin Connections
Single
+Vin
Remote On/Off
-Vin
-Vout
-Sense
Trim
+Sense
+Vout
0.50
(12.7)
1. All dimensions are in inches (mm)
2. Weight: 0.24 lbs (109 g) approx.
3. Tolerance: x.x = ±0.5 (x.xx = ±0.25)
x.xx = ±0.02 (x.xxx = ±0.01)
1
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RDF50 Series
Input
Characteristic
Input Voltage Range
Input Surge
Undervoltage Lockout
Lockout Hysteresis
Idle Current
Inrush Current
Recommended Input Fuse
Input Reflected Ripple Current
8
40
14.6
12.0
1.5
3
5
0.1
Minimum
14
Typical
Maximum
160
200
DC-DC Converter
Units
VDC
VDC
VDC
VDC
mA
A
2
s
A
mA pk-pk
Notes & Conditions
Covers 24, 48, 72 & 110 VDC nominal inputs
For 100 ms
On
Off
When output is inhibited
Time delay type
Through 10 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
180
200
15
10
0
±0.5
±0.2
±5.0
Minimum
5
-20
Typical
Maximum
48
+10
±1.0
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
No minimum load required
From minimum to maximum input at full load
From 0% to full load for single/dual output
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
General
Characteristic
Efficiency
Isolation: Input to Output
Input to Case
Output to Case
Switching Frequency
Isolation Resistance
Isolation Capacitance
Power Density
Mean Time Between Failure
Weight
780
0.136 (61.5)
3000
2500
500
180
10
9
Minimum
Typical
88
Maximum
Units
%
VDC
VAC
Notes & Conditions
See Models and Ratings table
60 s
Fixed
Input to Output
Input to Case
Output to Case
MIL-HDBK-217F, +25 °C GB
200
1000
1500
10000
220
kHz
pF
Ω
30
W/in
3
kHrs
lb (g)
Environmental
Characteristic
Operating Base Plate Temperature
Storage Temperature
Thermal Protection
Humidity
Cooling
Minimum
-40
-55
107
95
Typical
Maximum
+100
+125
Units
°C
°C
°C
%RH
Non-condensing
Base plate cooled
Notes & Conditions
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2
RDF50 Series
Safety Approvals
Agency
UL
Standard
cUL60950-1
DC-DC Converter
Notes & Conditions
ITE
EMC: Emissions
Phenomenon
ITE
Railway Equipment
Standard
EN55032
EN50121-3-2
Test Level
Class A
Notes & Conditions
See Application Notes
See Application Notes
EMC: Immunity
Phenomenon
Railway Equipment
ESD Immunity
Radiated Immunity
EFT/Burst
Surge
Conducted Immunity
Magnetic Fields
Standard
EN50121-3-2
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-5
EN61000-4-6
EN61000-4-8
±6 kV/±8 kV
20 V rms
±2 kV
±2 kV
10 V rms
3 A/m
A
A
A
A
A
A
With external electrolytic capacitor 68 µF/400 V
across input pins
With external electrolytic capacitor 68 µF/400 V
across input pins
Test Level
Criteria
Notes & Conditions
See Application Notes
Contact Discharge/Air Discharge
Mechanical Details
2.28 (57.9)
2.00 (50.8)
1.45
(36.8)
1.03
(26.2)
Mounting Holes
0.126 (3.2) clearance 2pl
3
2
4
5
6
7
8
0.60
(15.24)
BOTTOM VIEW
0.60
(15.24)
1
0.30
(7.62)
1.86 (47.2)
0.040 (1.02)
Dia 6 places
0.059 (1.50)
Dia 2 places
0.16 min
(4.1)
Pin
1
2
3
4
5
6
7
8
Pin Connections
Single
+Vin
Remote On/Off
-Vin
-Vout
-Sense
Trim
+Sense
+Vout
0.50
(12.7)
Notes
1. All dimensions are in inches (mm)
2. Weight: 0.24 lbs (109 g) approx.
3. Tolerance: x.x = ±0.5 (x.xx = ±0.25), x.xx = ±0.02 (x.xxx = ±0.01)
3
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RDF50 Series
Application Notes
V
DC-DC Converter
Input Fusing and Safety Considerations
The RDF50 series converters have no internal fuse. In order to achieve maximum safety and system protection, always use an input line fuse. We
recommended a 30 A fast acting 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
1
8
part would be 1.5KE180A.
+Vin
+Vout
Output Voltage Adjustment
The Trim input permits the user to adjust the
output voltage up by 10% or down by 20%. This
is accomplished by connecting an external
resistor between the Trim pin and either the
+Sense pin or the -Sense pin.
+
-
+Sense
Vin
TVS
2
On/Off
Trim
-Sense
3
-Vin
-Vout
7
6
5
4
Trim down Rd
Load
Trim up Ru
To Trim Down
Connecting an external resistor (Rd) between the Trim pin and the
Vout (+) (or +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%.
To Trim Up
Connecting an external resistor (Ru) between the Trim pin and the
Vout (-) (or -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
%
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
5V
215.8
103.0
65.40
46.60
35.32
27.80
22.43
18.40
15.27
12.76
10.71
9.00
7.55
6.31
5.24
4.30
3.47
2.73
2.07
1.48
12 V
Rtrim_down
687.3
327.1
207.0
147.0
110.9
86.96
69.81
56.95
46.94
38.94
32.39
26.93
22.31
18.35
14.92
11.92
9.277
6.923
4.817
2.921
24 V
(kΩ)
1703
807.8
509.2
359.9
270.3
210.6
167.9
135.9
111.0
91.16
74.87
61.20
49.82
39.97
31.44
23.97
17.29
11.53
6.298
1.583
48 V
3294
1588
1019
735.1
564.5
450.7
369.5
308.5
261.1
223.2
192.2
166.3
144.5
125.7
109.5
95.28
82.73
71.58
61.60
52.62
Trim Up
%
1
2
3
4
5
6
7
8
9
10
5V
50.45
24.34
15.63
11.28
8.67
6.93
5.69
4.75
4.03
3.45
12 V
24 V
48 V
147.3
71.29
45.93
33.24
25.63
20.56
16.94
14.22
12.10
10.41
Rtrim_up (kΩ)
154.1
164.0
74.95
78.64
48.56
50.18
35.37
35.94
27.45
27.40
22.17
21.71
18.41
17.64
15.58
14.59
13.38
12.22
11.62
10.32
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4
RDF50 Series
Thermal Resistance Information
Power Dissipated vs Ambient Temperature and Air Flow without heatsink
DC-DC Converter
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)
Air Flow Rate
Typical Rca
Natural Convection 20 ft/min (0.1 m/s) 10.1 °C/W
100 ft/min (0.5 m/s)
8.0 °C/W
200 ft/min (1.0 m/s)
5.4 °C/W
300 ft/min (1.5 m/s)
4.4 °C/W
400 ft/min (2.0 m/s)
3.4 °C/W
300 ft./min. (1.5 m/s)
400 ft./min. (2.0 m/s)
Ambient Temperature ,Ta(Deg. C)
Airflow Derating Graph
Example (Without Heatsink)
To determine the minimum airflow necessary for a RDF5072S12 operating at an input voltage of 72 V, an output current of 4.20 A, and a maximum
ambient temperature of 40°C:
Determine Power dissipation (Pd):
Pd = Pi-Po = Po(1-η)/η,
Pd =12 V× 4.2 A×(1-0.87)/0.87=7.53Watts
Determine airflow from airflow derating graph using data points for Pd=7.53 W and Ta = 40 °C
Minimum airflow= 200 ft./min.
To check that the maximum case temp of 100 °C is not exceeded:
Maximum temperature rise is
ΔT = Pd × Rca=7.53x5.4 = 40.67°C.
Maximum case temperature is
Tc=Ta+ΔT=80.67°C <100°C.
Where: Rca is the thermal resistance from case to ambient environment. Ta is ambient temperature and Tc is case temperature.
EMC Filter - EN55032 Emissions and Immunity
+Vin
D1
C1
L1
C2
L2
C3
C4
Where Pi = Input power, Po = Output Power and
η
= Efficiency
+Vin
+Vout
+Vo
C5
C6
RDF50
-Vin
+S
-S
-Vout
-Vin
-Vo
CY1
CY2
CASE
GND
C1, C3, C3
1 µF/250 V 1812
Ceramic Cap.
C4
82 µF/250 V
KXJ Series
Aluminium Cap.
C5
1 µF/100 V 1206
Ceramic Cap.
C6
22 µF/100 V
Solid Aluminium
Cap.
CY1, CY2
1500 pF
D1
1.5 KE 180 A
L1, L2
URT24-50055H
5.5 mH
Note: C4 UNITED CHEMI-CON KXJ series or equivalent, CY1, CY2 MURATA Y1 capacitors or equivalent, L1, L2 BULL WILL URT24-05055H or
equivalent.
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18 July 18
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