The RPP50 series 2:1 input range DC/DC converters are ideal for high end industrial applications and COTS Military
applications where a very wide operating temperature range of -45°C to +115°C is required. Although the case size
is very compact, the converter contains a built-in EMC filter EN-55022 Class B without the need for any external
components. The RPP50 is available in a ribbed case style for active cooling. They are UL-60950-1 certified.
Selection Guide
Part
Number
RPP50-2412S
Input
Voltage Range
[VDC]
18-36
Notes:
Note1:
Input
Current
[mA]
2370
Output
Voltage
[VDC]
12
Output
Current
[mA]
4170
Efficiency
typ.
[%]
89
Max. Capacitive
Load
[µF]
1000
Typical values at nominal input voltage and full load.
Specifications
(measured @ ta= 25°C, nominal input voltage, full load and after warm-up)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Transient Input Voltage
Inrush Current
Under Voltage Lockout
Remote ON/OFF
Remote OFF Input Voltage
Start-up Time
Internal Operating Frequency
Output Voltage Trimming
Efficiency
Minimum Load
Output Ripple and Noise
typ. Vin, full load
20MHz limited, 1µF output MLCC
88%
0%
50mVp-p
100mVp-p
* ICE Technology
ICE (Innovation in Converter Excellence)
uses state-of-the-art techniques to minimise
internal power dissipation and to increase
the internal temperature limits to extend the
ambient operating temperature range to the
maximum.
Condition
nom. Vin= 24VDC
≤100ms
with EMC Filter
without EMC Filter
DC-DC ON
DC-DC OFF
ON / high logic
OFF / low logic
nominal input
when use CTRL function
Min.
18VDC
Typ.
24VDC
Max.
36VDC
50VDC
20A
40A
E224736
17.5VDC
Open, 4.5V
Short, 0V
5mA
20ms
270kHz
300kHz
±10%
89%
330kHz
17VDC
5.5V
1.2V
UL-60950-1 Certified
EN-55022 Certified
Efficiency vs. Load
100
100
90
90
100
100
90
90
Efficiency vs. Input Voltage
Efficiency [%]
Efficiency [%]
80
80
70
70
60
60
50
50
18Vin
18Vin
24Vin
24Vin
36Vin
36Vin
10 20 30 40 50 60 70 80 90 100
10 20 30 40 50 60 70 80 90 100
Efficiency [%]
Efficiency [%]
80
80
70
70
60
60
50
50
18 20 22 24 26 28 30 32 34 36
18 20 22 24 26 28 30 32 34 36
Load [%]
Load [%]
55
55
Input Voltage [V]
Input Voltage [V]
continued on next page
50
50
erature [°C]
erature [°C]
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45
45
REV.: 5/2018
RPP-1
RPP50-2412S
DC/DC Converter
Trimming Output Voltage
Only the single output converters have a trim function that allows users to adjust the output voltage from +10% to -10%, please refer to
the trim table that follow for details. Adjustment to the output voltage can be used with a simple fixed resistor as shown in Figures 1 and 2.
A single fixed resistor can increase or decrease the output voltage depending on its connection. Resistor should be located close to the converter.
If the trim function is not used, leave the trim pin open.
Trim adjustments higher than the specified range can have an adverse effect on the converter´s performance and are not recommended.
Excessive voltage differences between output voltage sense voltage, in conjunction with trim adjustment of the output voltage; can cause
the OVP circuitry to activate. Thermal derating is based on maximum output current and voltage at the converter´s output pins. Use of
the trim and sense function can cause output voltages to increase, thereby increasing output power beyond the converter´s specified rating.
Therefore: (Vout at Pins) X (Iout)
≤
rated output power.
+V
IN
CTRL
-V
IN
+V
OUT
TRIM
R
TRIM
UP
-V
OUT
-V
IN
-V
OUT
+V
IN
+V
OUT
TRIM
R
TRIM
DOWN
Series
Specifications
(measured @ ta= 25°C, nominal input voltage, full load and after warm-up)
LOAD
CTRL
LOAD
Figure 1.
Trim connections to increase
output voltage using fixed resistors
Trim up resistor value (KW)
Vout
1%
2%
3%
4%
46.3
5%
32.1
6%
22.4
7%
15.4
8%
9.8
9%
6.5
10%
3.2
Vout
Figure 2.
Trim connections to decrease output
voltage using fixed resistors
Trim down resistor value (KW)
-1%
-2%
-3%
-4%
53.1
-5%
35.5
-6%
24.0
-7%
16.0
-8%
9.7
-9% -10%
5.0
1.3
12VDC
322.2 137.2 81.1
12VDC
238.7 113.1 68.2
REGULATIONS
Parameter
Output Voltage Accuracy
Line Voltage Regulation
Load Voltage Regulation
Transient Response
Transient Peak Deviation
Condition
50% load
low line to high line
10% to 100% load
25% load step change,
ΔIo/Δt=2.5A/us
25% load step change,
ΔIo/Δt=2.5A/us
Value
±1.5% max.
±0.3% max.
±0.5% max.
800µs typ.
±2%Vout max.
PROTECTIONS
Parameter
Output Power Protection (OPP)
Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Notes:
Note2:
RPP-2
Condition
Hiccup Mode
10% load
case temperature
I/P to O/P, at 70% RH
I/P to Case, O/P to Case
I/P to O/P , at 70% RH
I/P to O/P
This Power Module is not internally fused. A input fuse must be always used. Recommended Fuse: T4A
REV.: 5/2018
Value
120% typ.
120% typ.
120°C, auto-recovery
2250VDC / 1 Minute
1500VDC / 1 Minute
100MW min.
1500pF typ.
www.recom-power.com
RPP50-2412S
DC/DC Converter
ENVIRONMENTAL
Parameter
Relative Humidity
Temperature Coefficient
100
90
Series
Condition
100
90
Specifications
(measured @ ta= 25°C, nominal input voltage, full load and after warm-up)
Value
95%, non condensing
±0.04% / °C max.
4.6°C/W
6.4°C/W
-45°C to (see calculation)
+115°C
609 x 10
3
hours
1541 x 10
3
hours
18
20
22
24
26
28
30
Efficiency [%]
Thermal Impedance
Operating Temperature Range
Maximum Case Temperature
MTBF
Efficiency [%]
100
natural convection, mounting at FR4
80
(254x254mm) PCB
70
60
50
10
vertical
horizontal
80
70
60
50
start up at -45°C
18Vin
24Vin
according to MIL-HDBK-217F (+50°C G.B.)
36Vin
20
30
40
50
60
70
80
90
according to BellCore-TR-332 (+50°C G.B.)
Derating Graph
55
3
(Ta= +25°C, natural convection, typ. Vin and vertical mounting)
Load [%]
Input Voltage [V]
50
Case Temperature [°C]
45
40
35
Calculation
R
thcase-ambient
= 4.6°C/W (vertical)
R
thcase-ambient
= 6.4°C/W (horizontal)
R
thcase-ambient
=
T
case
- T
ambient
P
dissipation
30
0
10
20
30
40
50
60
70
80
90 100
Load [%]
T
case
T
ambient
P
dissipation
P
IN
P
OUT
h
= Case Temperature
= Environment Temperature
= Internal losses
= Input Power
= Output Power
= Efficiency under given Operating Conditions
P
dissipation
= P
IN
- P
OUT
P
=
OUTapp
- P
OUTapp
h
R
thcase-ambient
= Thermal Impedance
Practical Example:
Take the RPP50-2412S with 50% load. What is the maximum ambient operating temperature? Use converter vertical in application.
Eff
min
= 89% @ V
nom
P
OUT
= 50W
P
OUTapp
= 50 x 0.5 = 25W
P
dissipation
=
P
OUTapp
- P
OUTapp
h
R
th
=
T
casemax
- T
ambient
P
dissipation
--> 4.6°C/W =
115°C - T
ambient
2.47W
h
= ~91% (from Eff vs Load Graph)
25
- 25 = 2.47W
P
dissipation
=
0.91
T
ambientmax
= 103.6°C
continued on next page
www.recom-power.com
REV.: 5/2018
RPP-3
RPP50-2412S
DC/DC Converter
Soldering
Hand Soldering
Hand Soldering is the least preferred method because the amount of
solder applied, the time the soldering iron is held on the joint, the
temperature of the iron and the temperature of the solder joint are
variable.
The recommended hand soldering guideline is listed in Table 1. The
suggested soldering process must keep the power module’s internal
temperature below the critical temperature of 217°C continuously.
Table 1 Hand-Soldering Guideline
Parameter
Soldering
Iron Wattage
Tip
Temperature
Soldering Time
Single-side
Circuit Boad
90W
385 ±10°C
2-6 seconds
Double-side
Circuit Board
90W
420 ±10°C
4-10 seconds
Multi-layers
Circuit Board
Wave Soldering
High temperature and long soldering time will result in IMC layer
increasing in thickness and thereby shorten the solder joint lifetime.
Therefore the peak temperature over 245°C is not suggested due
to the potential reliability risk of components under continuous high-
temperature. In the meanwhile, the soldering time of temperature
above 217°C should be less than 90 seconds. Please refer to the sol-
dering profile below for recommended temperature profile parameters.
Series
Specifications
(measured @ ta= 25°C, nominal input voltage, full load and after warm-up)
T
emp
Peak T
emp. 240 - 245°C
217°C
90W
420 ±10°C
4-10 seconds
Ramp downmax. 4°C/sec
200°C
150°C
Preheat time100-140 sec.
Time Limited 90sec.above 217°C
25°C
Ramp upmax. 3°C/sec
Time
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
Report Number
E224236
Standard
UL-60950-1, 1st Edition
Certificate Type (Environmental)
Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement
ESD Immunity Test
RF Field Strengh Susceptibility Test
Electrical Fast Transient Test / Burst Immunity Text
Surge Immunity Test
Conducted Disturbance Susceptibility Test
Vibration
Thermal Cycling (complies with MIL-STD-810F)
Shock
Condition
±8kV Air Discharge,
±6kV Contact Discharge
10V/m
±4kV Applied
±4kV Applied
10V rms
50-150Hz, along X, Y and Z
12 cycles
5g / 30ms
Standard / Criterion
EN55022, Class B
IEC61000-4-2, Criteria B
IEC61000-4-3, Criteria A
IEC61000-4-4, Criteria B
IEC61000-4-5, Criteria B
IEC61000-4-6, Criteria A
EN60068-2-6
EN60068-2-14
EN60068-2-27
EMC Filtering - Suggestions
+V
IN
D1
C4
UR1
C1
C6
L1
C2
C3
C5
DUT
C7
Load
-V
IN
It is recommended to add UR1, D1 and C1 in railway
application. C1, L1, C2 and C3 can be modified for
required EMI standards. To meet EN61000-4-2, module
case should be earth grounded. We offer independent
case pin option on request.
Standard
EN55022 Class B
EN61000-4-2, 3, 4, 5, 6
UR1
MOV 14D361K
D1
50V / 9A
C1
1.5µF / 250V
N/A
L1
550µH ±20%
N/A
C2
6.8µF / 50V
N/A
C3
330µF / 50V
C4, C5, C6, C7
0.47nF Y1-Cap
RPP-4
REV.: 5/2018
www.recom-power.com
RPP50-2412S
DC/DC Converter
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
(3)
Series
Value
Aluminium
50.8 x 30.5 x 12.7mm
39g
50.8
Specifications
(measured @ ta= 25°C, nominal input voltage, full load and after warm-up)
Package Dimension (LxWxH)
Package Weight
Dimension Drawing (mm)
30.5
2.54
11.68
9.14
dia. 1.0
45.72
4.32
Sandoff
=1.02
Pin Connections
Pin #
Single
5.08
10.16
1
2
6
3
Bottom View
4
10.16
10.16
1
2
3
4
5
6
Tolerance
:
+Vin
-Vin
+Vout
-Vout
Trim
CTRL
7.62
5
±
0.5mm
Notes:
Note3:
To ensure a good all-round electrical contact, the bottom plate is pressed firmly into place into the aluminium case.The hydraulic press can
leave tooling marks and deformations to both the case and plate. The case is anodised aluminium, so there will be natural variations in the case
colour and the aluminium is not scratch resistant. Any resultant marks, scratches and colour varations are cosmetic only and do not affect the
operation or performance of the converters.
INSTALLATION and APPLICATION
Test Set-up
+
DC
Power
Source
5µH
in
50Ω
out
rcvr
Printed Circuit Board
50 Ohm termination
Product
LISN
Filter
(if used)
5µH
in
50Ω
out
rcvr
-
LISN
1m Twisted Pair
Resistive
Load
Optional Connection
to Earth Ground
50 Ohm input
EMC
Reciever
Computer
PACKAGING INFORMATION
Parameter
Packaging Dimension (LxWxH)
Packaging Quantity
Storage Temperature Range
Type
Tube
Value
160.0 x 55.0 x 20.0mm
4pcs
-55°C to +125°C
The product information and specifications may be subject to changes even without prior written notice.The product has been designed for various applications; its suitability lies in the responsibility of each customer. The
products are not authorized for use in safety-critical applications without RECOM’s explicit written consent. A safety-critical application is an application where a failure may reasonably be expected to endanger or cause
loss of life, inflict bodily harm or damage property. The applicant shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized
use of RECOM products in such safety-critical applications.
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