The RPP20-W series 4:1 input range DC/DC converters are ideal for high end industrial
applications and COTS Military applications where a very wide operating temperature
range of -40°C to +115°C is required. Although the case size is compact, the converter
contains a built-in filter EN55022 Class B / FCC Level B without the need for any external
components. The RPP20-W is available in two case styles: the ribbed case for active cooling
and the baseplate case for high vibration, bulkhead-mounting or for passive cooling appli-
cations. They are UL-60950-1 certified.
20 Watt
4:1 Single
&
Dual Output
Selection Guide
24V and 48V 4:1 Input Types
Part Number
Input
Range
VDC
9-36
9-36
9-36
9-36
9-36
18-75
18-75
18-75
18-75
9-36
9-36
9-36
18-75
18-75
18-75
Output
Voltage
VDC
3.3
5
12
15
24
3.3
5
12
15
24
±12
±15
±24
±12
±15
±24
Output
Current
mA
6000
4000
1666
1333
830
6000
4000
1666
1333
830
±833
±666
±416
±833
±666
±416
Input
(1)
Current
mA
59/955
65/946
23/946
25/931
25/931
28/465
33/465
13/470
12/466
12/466
28/930
24/946
24/946
16/472
13/466
13/466
Efficiency
(2)
(Min.)
87%
86%
86%
86%
86%
87%
86%
86%
86%
86%
86%
87%
87%
86%
87%
87%
2011/65/EU
6/6
RPP20-243.3SW**
RPP20-2405SW**
RPP20-2412SW**
RPP20-2415SW**
RPP20-2424SW**
RPP20-4805SW**
RPP20-4812SW**
RPP20-4815SW**
RPP20-4824SW**
RPP20-2412DW**
RPP20-2415DW**
RPP20-2424DW**
RPP20-4812DW**
RPP20-4815DW**
RPP20-4824DW**
RoHS
RPP20-483.3SW** 18-75
UL-60950-1 Certified
E224736
RPP20-W
* 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.
Refer to Application Notes
** add suffix for case options
SUFFIX INFORMATION
none = Standard Ribbed Case
-B = Baseplate Case
For other CTRL logic (-1), case style (-F) or low temperature options (-L, -M, -T) please contact RECOM for availability.
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DC/DC-Converter
Specifications
(typical at nominal input and 25°C unless otherwise noted)
Input Voltage Range
Under Voltage Lockout
RPP20-S_DW
Series
24V nominal input
48V nominal input
24V input DC-DC ON (min.)
DC-DC OFF (max.)
48V input DC-DC ON (min.)
DC-DC OFF (max.)
9-36VDC
18-75VDC
8.5VDC
8VDC
17.5VDC
17VDC
Common Mode EMC Filter
24V Input
48V Input
nominal Vin and full load
nominal Vin and constant resistor load
Logic High
Logic Low
Nominal input
50VDC
100VDC
200mAp-p
20ms typ., 50ms max.
Open or 3.0V < Vr < 5.5V
Short or 0V < Vr < 1.2V
2mA typ.
20W
Nominal Vin
Single Output only
±1.5%
±5%
0%
low line, high line at full load
10% to 100% full load
Dual Outputs only
3.3V
All others
±0.3%
±0.5%
3% typ. / 5% max.
100mVp-p typ.
40mV-75mVp-p typ.
±0.04%/°C max.
25% load step change
% of full load at nominal Vin
800µs
120% typ.
Power Limit, automatic recovery
Converter shutdown if Vout > Vout nominal + 20%
Rated at 1600VDC/1 minute, Flash tested at 2000VDC/1 second
10MΩ min.
1500pF max.
260kHz ± 40kHz
Ambient, Free Convection
-40°C to see Calculation (Note 7)
+115°C
-55°C to +125°C
internal thermistor
Ribbed Case: Vertical
Ribbed Case: Horizontal
7.5°C/Watt
11.5°C/Watt
5% to 95% RH
Aluminium
Silicone (UL94-V0)
continued on next page
Input Filter
Input Surge Voltage (100 ms max.)
Input Reflected Ripple
Start Up Time
Remote ON/OFF
(3)
Remote OFF input current
Output Power
Output Voltage Accuracy
Voltage Adjustability
Minimum Load
Line Regulation
Load Regulation
Cross Regulation (10% <> 100% Load)
Ripple and Noise (20MHz bandwith limited)
(measured with 1µF capacitor across outputs)
RPP20-W
Temperature Coefficient
Transient Response
Over Load Protection
Short Circuit Protection
Output Over Voltage Protection (refer to block diagram in Application Notes)
Isolation Voltage
Isolation Resistance
Isolation Capacitance (refer to block diagram in Application Notes)
Operating Frequency
Operating Temperature Range
Maximum Case Temperature
Storage Temperature Range
Over Temperature Protection (refer to block diagram in Application Notes)
Thermal Impedance
(Natural convection)
Relative Humidity
Case Material
(6)
Potting Material
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DC/DC-Converter
Specifications
(typical at nominal input and 25°C unless otherwise noted)
Weight
Packing Quantity
Safety Standards
Thermal Cycling
Vibration
Conducted Emissions
Radiated Emissions
ESD
Radiated Immunity
Fast Transient
(4)
Surge
(4)
Conducted Immunity
MTBF calculated according to BELLCORE TR-NWT-000332
(5)
EN55022
EN55022
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-5
EN61000-4-6
Ribbed Case
Baseplate Case
Ribbed Case
Baseplate Case
RPP20-S_DW
Series
26g
43g
5 pcs per Tube
Single packed
certified UL-60950-1, 1st Edition
complies with MIL-STD-810F
10-55Hz, 12G, 30 Min. along X, Y and Z
Class B
Class B
Perf. Criteria B
Perf. Criteria A
Perf. Criteria B
Perf. Criteria B
Perf. Criteria A
2195 x 10
3
hours
Notes :
1. Typical values at nominal input voltage and no load/full load.
2. Min. values at nominal input voltage and full load.
3. The ON/OFF pin voltage is referenced to negative input. The pin is pulled high internally.
ON/OFF control is standard with positive logic: e.g. RPP20-2405SW, RPP20-4805DW-B.
Positive logic: 0= OFF, 1 = ON. The converter will be ON if the CTRL is left open.
4. Requires an external 100µF low ESR capacitor to meet EN61000-4-4 and EN61000-4-5
5. Case l: 50% Stress, Temperature at 50°C (Ground Benign).
6. To ensure a good all-round electrical contact, the baseplate is pressed firmly into place within the aluminium housing.The hydraulic press can leave
tooling marks and deformations to both the housing and baseplate. 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.
7. Example:
T
case
= Case Temperature
R
thcase-ambient
= 7.5°C/W (vertical)
T
ambient
= Environment Temperature
R
thcase-ambient
= 11.5°C/W (horizontal)
P
dissipation
= Internal losses
Tcase - Tambient
P
in
= Input Power
R
thcase-ambient
=
Pdissipation
P
out
= Output Power
Pout
Ƞ
= Efficiency under given Operating Conditions
P
dissipation
= Pin-Pout =
Ƞ
- Pout
R
thcase-ambient
= Thermal Impedance
RPP20-W
P
dissipation
= Pin-Pout =
Practical Example:
Pout
Ƞ
- Pout
Take the RPP20-2405SW with 60% load. What is the maximum ambient operating temperature? Use converter vertical in application.
Eff
min
= 86% @ V
nom
P
out
= 20W
P
outapp
= 20 x 0.6 = 12W
P
dissipation
=
Ƞ
Pout
Ƞ
- P
out
R
th
=
115°C - Tambient
Tcasemax - Tambient
--> 7.5°C/W =
2.12W
P
dissipation
= ~85% (from Eff vs Load Graph)
12
- 12 = 2.12W
0.85
T
ambient
= 99.1°C
P
dissipation
=
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DC/DC-Converter
Typical Characteristics
RPP20-S_DW
Series
-Vout
Trim Up
Trim
Trim Down
+Vout
10k
W
Trimpot
+Vout
10k
W
Trimpot
Trim
10k
W
Trimpot
-Vout
External Output Trimming
Refer To Application Notes for
recommended resistor Values
RPP20-2405SW
Efficiency VS Load
12V
24V
9V
36V
Efficiency VS Input Voltage
92
91
90
89
88
87
86
85
84
83
82
100
90
80
70
60
50
40
30
20
10
0
Efficiency (%)
0
20
40
60
80
100
Efficiency (%)
9
12
15
RPP20-W
Output Load (%)
18 21
24
Input Voltage (V)
27
30
33
36
Recommended PCB Layout
Ribbed Case
Single Output
Dual Output
C2
C1
C2
C1
C3
Fuse
Top View
Fuse
Top View
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DC/DC-Converter
Recommended PCB Layout
RPP20-S_DW
Series
Single Output
Dual Output
Baseplate Case- suggested PCB layout
C2
C1
No tracks
in this area
(42 x 30mm)
C3
C3
Fuse
Top View
Input Fuse is recommended. Recommended fuse rating = double maximum input current, time delay type.
Input Capacitor, C1, is required to meet EN61000 Surge and Fast Transient, otherwise it is not required for normal operation.
Output Capacitors C2/C3 are recommended, but not required for normal operation. Typical capacitor values are 1µF MLCC
To ensure optimum thermal performance, use large areas of copper on the PCB to assist with heat dissipation and mount the converter vertically.
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