Features
Regulated
Converter
Description
• Sixteenth Brick Format
• 4:1 Input Voltage Range
• 2.25kV Basic Isolation
• Remote ON/OFF And Trim Pins
• UVLO, OTP, OVP, OCP and SCP
• Efficiency Up To 91%
DC/DC Converter
RPA50S-W
The RPA50S is a low cost 50W DC/DC converter in industry standard 1/16th brick format (33mm x 23mm) and
pinning. The 4:1 input range covers 24V, 28V or 48V nominal input voltages and the output voltage options are
3.3V, 5V or 12V with +10%/-20% trim. Output power is 40W from 18-75V or 50W from 36-75V. The efficiency is
particularly high (88-91%) to permit full load operation from -40°C up to +54°C ambient temperature with only free
air convection and up to 85°C with forced air cooling. The isolation voltage is 2.25kVDC/1 minute (basic insulation
grade). Applications include demanding industrial power supplies, telecom and PoE circuits.
50Watt
3
1/16 Brick
Single Output
3Y
wa
EAR
rranty
Selection Guide
Part
Number
nom. Input
Voltage Range
(1)
[VDC]
RPA50S-483.3SW/P
18-75
RPA50S-4805SW/P
18-75
RPA50S-4812SW/P
18-75
Output
Voltge
[VDC]
3.3
5
12
Output
Current
[A]
15
10
4.2
Efficiency
max.
(1)
[%]
90.5
91
89
Max. Capacitive
typ. Load
(2)
[µF]
10000
5000
2200
Notes:
Note1: Efficiency is tested at nominal input and full load at +25°C ambient
Note2: Max. Cap Load is tested at nominal input and full resistive load
E224736
UL60950-1 Certified
IEC/EN60950-1 Certified
Model Numbering
RPA50S-__ __ SW/P
Input Voltage
Output Voltage
Positive CTRL logic
Single
Ordering Examples
RPA50S-4805SW/P = 48V Input, 5V Output, Single, Pos. CTRL function
Specifications
(measured
Parameter
Internal Input Filter
Input Voltage Range
Input Surge Voltage
Under Voltage Lockout (UVLO)
Input Current Range
Quiescent Current
@ ta = 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
BASIC CHARACTERISTICS
Condition
nom. Vin = 48V
100ms
DC-DC ON
DC-DC OFF
18Vin
3.3Vout
5Vout
12Vout
60
30mA
40mA
20mA
16VDC
15VDC
17VDC
16VDC
Min.
18VDC
Typ.
48VDC
Max.
Pi-Type
75VDC
100VDC
18VDC
17VDC
3.9A
Output Power [W]
36
48
75
50
40
20
0
18
24
36
48
75
ut Voltage [V]
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Input Voltage [V]
continued on next page
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PB-1
RPA50S-W
DC/DC Converter
Specifications
(measured
Parameter
Output Voltage Trimming
Minimum Load
Start-up Time
Power up
Remote ON/OFF
3.3 & 5Vout
ON/OFF CTRL
Input Current of CTRL pin
Standby Current
Internal Operating Frequency
Output Ripple & Noise
(3)
Remote Sense
Notes:
Note3: measured with 1µF ceramic and 10µF tantalum in parallel accross O/P
@ ta = 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
Series
Condition
Min.
-20%
0%
30ms
30ms
Open or 2.4V < Vr < 18V
Short or 0V < Vr < 0.8V
Open or 2V < Vr < 18V
Short or 0V < Vr < 0.8V
1mA
6.5mA
3.3 & 5Vout
12Vout
5MHz to 20MHz BW.
3.3 & 5Vout
12Vout
580kHz
440kHz
60mVp-p
100mVp-p
150mVp-p
10%
BASIC CHARACTERISTICS
Typ.
Max.
+10%
Positive Logic
12Vout
DC-DC ON
DC-DC OFF
DC-DC ON
DC-DC OFF
RPA50S-483.3SW/P
Efficiency vs. Output Current
100
90
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
18V
36V
48V
75V
90
100
80
10
9
8
7
6
5
4
3
2
1
0
10
20
30
40
50
60
70
80
18V
36V
48V
75V
90
100
Power Dissipation vs. Output Current
Output Current [%]
Power Dissipation [W]
Efficiency [%]
Output Current [%]
RPA50S-4805SW/P
Efficiency vs. Output Current
100
90
80
10
9
8
7
6
5
4
3
2
1
0
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
18V
36V
48V
75V
90
100
Power Dissipation vs. Output Current
Efficiency [%]
70
60
50
40
30
20
10
0
18V
36V
48V
75V
Power Dissipation [W]
Output Current [%]
continued on next page
PB-2
REV.: 0/2017
Output Current [%]
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RPA50S-W
DC/DC Converter
Specifications
(measured
@ ta = 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
Series
Power Dissipation vs. Output Current
10
9
8
7
6
5
4
3
2
1
100
RPA50S-4812SW/P
Efficiency vs. Output Current
100
90
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
18V
36V
48V
75V
90
80
Power Dissipation [W]
Efficiency [%]
18V
36V
48V
75V
0
10
20
30
40
50
60
70
80
90
100
0
Output Current [%]
Output Current [%]
OUTPUT VOLTAGE TRIMMING
Output Voltage Trimming
RPA50S-W converters offer the feature of trimming the output voltage over a certain range around the nominal value by using external trim
resistors. The values for trim resistors shown in trim tables below are according to standard E96 values; therefore, the specified voltage may
slightly vary; they also can be calculated with below shown equation.
TRIM UP
TRIM
R
1
+Sense
TRIM DOWN
-Sense
R
2
TRIM
Trim Calculation
Vout
12Vout
R
1
= 5.11*Vout*(100 +
DVout)
- 511 - 10.22kΩ
1.225*
DVout
DVout
= Output Voltage
= trim up resistor
= trim down resistor
Trim Up:
3.3, 5 Vout
R
1
= 5.11*Vout*(100 +
DVout)
- 511 - 10.22kΩ
1.24*
DVout
DVout
DVout
= Output Voltage Change in %
R1
R2
Trim Down:
R
2
= 511 -10.22
DVout
Practical Example:
Trim Up:
Vout = 12V,
DVout
= +10% (13.2V)
R
1
= 5.11*12*(100 +
10)
- 511 = 6745.2 -51.1-10.22= 489.3kΩ
1.24*10
10
12.24
Trim down:
Vout = 12V,
DVout
= -10% (10.8V)
R
2
= 511 -10.22 = 40.88kΩ
10
continued on next page
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REV.: 0/2017
PB-3
RPA50S-W
DC/DC Converter
Specifications
(measured
RPA50S-483.3SW/P
Trim up
Vout =
R
1
=
1
3.33
845
2
3.37
432
3
3.40
287
4
3.43
215
5
3.47
174
6
3.50
143
7
3.53
124
8
3.57
110
9
3.60
97.60
10
3.63
88.7
%
Volts
kOhms
@ ta = 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
Series
RPA50S-4805SW/P
Trim up
Vout =
R
1
=
1
5.05
1540
2
5.10
787
3
5.15
523
4
5.20
402
5
5.25
324
6
5.30
267
7
5.35
232
8
5.4
205
9
5.45
182
10
5.50
165
%
Volts
kOhms
RPA50S-4812SW/P
Trim up
Vout =
R
1
=
1
12.12
4530
2
12.24
2280
3
12.36
1540
4
12.48
1150
5
12.60
931
6
12.72
787
7
12.84
681
8
12.96
604
9
13.08
536
10
13.20
487
%
Volts
kOhms
Trim Down all Vout‘s
Trim down
R
2
=
Trim down
R
2
=
1
499
11
36.5
2
243
12
33.2
3
162
13
29.4
4
118
14
26.1
5
93.1
15
23.7
6
75.0
16
21.7
7
63.4
17
20.0
8
53.6
18
18.20
9
46.4
19
16.9
10
41.2
20
15.0
%
kOhms
%
kOhms
REMOTE SENSE
+Vin
+Vout
+Sense
R1
Load
Trim
R2
-Sense
-Vin
-Vout
(GND)
RW2
RW1
The output voltage can be adjusted by both trim and remote sense. The
maximum combined adjustment range ±10%. Derate the maximum out-
put power if using the trim or sense function.
RW1 ... wire losses +
RW2 ... wire losses -
R1 ... trim up resistor
R2 ... trim down resistor
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
0% - 100% load
3.3Vout
5 & 12Vout
3.3Vout
5Vout
12Vout
25% to 50% load step change
50% to 25% load step change
setting time
25% to 50% load step change
50% to 25% load step change
setting time
Condition
Value
±3.0%
±0.3% max.
±0.1% max.
±0.3% max.
±0.2% max.
±0.1% max.
100mV typ.
100mV typ.
200µs typ.
400mV typ.
400mV typ.
500µs typ.
3.3 & 5Vout
Transient Response
12Vout
continued on next page
PB-4
REV.: 0/2017
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RPA50S-W
DC/DC Converter
Specifications
(measured
Accuracy vs Load
3
2
@ ta = 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
Series
RPA50-4805SW/P
3
2
RPA50-483.3SW/P
Accuracy [%]
0
-1
-2
-3
Accuracy [%]
1
1
0
-1
-2
-3
18V
36V
48V
75V
0
20
40
60
80
100
18V
36V
48V
75V
0
20
Output Current [%]
RPA50-4812SW/P
Output Current [%]
40
60
80
100
3
2
Accuracy [%]
1
0
-1
-2
-3
0
20
18V
36V
48V
75V
Output Current [%]
40
60
80
100
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Over Voltage Protection (OVP)
Over Current Protection (OCP)
Over Temperature Protection (OTP)
Isolation Voltage
(4)
Isolation Resistance
Isolation Capacitance
Leakage Current
Insulation Grade
Notes:
Note4: For repeat Hi-Pot testing, reduce the time and/or the test voltage
Note5: An input fuse is required if the mains supply is not over-current protected. Recommended fuse T10A slow blow type
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PB-5
Type
below 100mΩ
3.3 & 5Vout
12Vout
Value
hiccup mode, auto recovery
115% - 140%, hiccup mode
120% - 150%, hiccup mode
110% - 140%, hiccup mode
130°C, hiccup mode
I/P to O/P
rated for 1 minute
2.25kVDC
10MΩ min.
1000pF typ.
0.23mA max.
Basic
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