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Features
Switching
Regulator
• Efficiency up to 96%, no need for heatsinks
• 2A continuous output current
• Vin up to 32V
• Vout: 1.2V - 15V
• Wide operating temperature -40°C to +70°C at full load
• Continuous short circuit protection
• Pin compatible with TO220 linear regulators
• Positive to negative converter
R-78B-2.0
Description
The R-78Bxx-2.0 series high efficiency switching regulators are ideally suited to replace 78xx linear
regulators and are pin compatible. The efficiency of up to 96% means that very little energy is wasted
as heat. Full power is available over a temperature range of -40°C up to 70°C without the need for
heatsinks with their additional space and mounting costs. A high input voltage of up to 32VDC and
output voltages from 1.2V up to 15V, low ripple and noise figures and a short circuit input current of
typically only 50mA round off the specifications of this versatile converter series.
DC/DC Converter
2.0 Amp
SIP3
Single Output
IEC62368-1 certified
EN62368-1 certified
EN55032 compliant
CB report
Selection Guide
Part Input Output Output Efficiency @ full load Max. Capacitive
Number Voltage Range Voltage Current @ min Vin @ max. Vin Load (1)
[VDC] [VDC] [mA] [%] [%] [µF]
R-78B1.2-2.0 4.75 - 32 1.2 2000 87 72 3300
R-78B1.5-2.0 4.75 - 32 1.5 2000 90 79 3300
R-78B1.8-2.0 4.75 - 32 1.8 2000 91 80 3300
R-78B2.5-2.0 4.75 - 32 2.5 2000 92 84 2300
R-78B3.3-2.0 4.75 - 32 3.3 2000 92 86 1800
R-78B5.0-2.0 6.5 - 32 5 2000 94 90 820
R-78B9.0-2.0 11 - 32 9 2000 95 93 620
R-78B12-2.0 15 - 32 12 2000 96 94 470
R-78B15-2.0 18 - 32 15 2000 96 95 470
Notes:
Note1: Max. cap load is tested by nominal input and full resisitive load
Model Numbering
Output Voltage Output Current
R-78B__-2.0
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DC/DC Converter
Specifications (measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
R-78B-2.0
Series
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Input Voltage Range nom. Vin= 24VDC
1.2Vout - 3.3Vout
5Vout
9Vout
12Vout
15Vout
4.75VDC
6.5VDC
11VDC
15VDC
18VDC
24VDC 32VDC
Maximum Reverse Voltage 0V
Inrush Current 2A
Quiescent Current nom. Vin= 24VDC 2mA
Internal Power Dissipation Vout= 1.5VDC 0.35W 0.8W
Start-up time 10ms
Rise Time 50µs
Internal Operating Frequency
nom. Vin= 24VDC 460kHz
Minimum Load 0%
Output Ripple and Noise (2) 20MHz BW Vout ≤3.3VDC
Vout ≥5VDC
50mVp-p
75mVp-p
Efficiency vs. Load R-78B3.3-2.0
R-78B3.3-2.0
R-78B5.0-2.0
R-78B5.0-2.0
Efficiency vs. Input Voltage
0 10 20 30 40 50 60 70 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
4.75Vin
6Vin
9Vin
12Vin
15Vin
24Vin
32Vin
4.75 9 13 17 21 25 29 32
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Input Voltage [VDC]
0 10 20 30 40 50 60 70 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
6.5Vin
12Vin
15Vin
24Vin
32Vin
6.5 10 14 18 22 26 30 32
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Input Voltage [VDC]
Notes:
Note2: Measurements are made with a 100nF MLCC across output (low ESR)
www.recom-power.com REV.: 4/2019 I-3
DC/DC Converter
Specifications (measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
R-78B-2.0
Series
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range without derating (see graph) -40°C to +70°C
Maximum Case Temperature +105°C
Temperature Coefficient 0.02%/°C typ.
Operating Altitude 5000m
Operating Humidity non-condensing 95% RH max.
Pollution Degree PD2
Vibration 10-55Hz, 2G, 30min along X, Y and Z axis
MTBF according to MIL-HDBK-217F, G.B. +25°C 6349 x 103 hours
-40 -20 0 20 40 70
85
60-30 -10 10 30 50 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Output Load [%]
Ambient Temperature [°C]
Derating Graph
(@ Chamber and natural convection 0.1m/s)
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) below 100mWcontinuous, automatic recovery
Short Circuit Input Current nom. Vin= 24VDC <5Vout
≥
5Vout
50mA typ.
75mA typ.
REGULATIONS
Parameter Condition Value
Output Accuracy 100% load ±2.0% typ.
Line Regulation low line to high line, full load ±0.5% typ.
Load Regulation 0% to 100% load ±1.0% typ.
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DC/DC Converter
Specifications (measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
R-78B-2.0
Series
SAFETY AND CERTIFICATIONS
Certificate Type (Safety) Report / File Number Standard
Audio/video, information and communication technology equipment
Safety requirements (CB Scheme) L0339m38-B1-L IEC62368-1: 2014, 2nd Edition
EN62368-1: 2014
EAC RU-AT.49.09571 TP TC 004/2011
RoHS2+ RoHS 2011/65/EU + AM2015/863
EMC Compliance Condition Standard / Criterion
Electromagnetic compatibility of multimedia equipment - Emission requirements with external components
(see filter suggestion below)
EN55032, Class A
EN55032, Class B
Information technology equipment - Immunity characteristics - Limits and methods
of measurement EN55024:2010
Electromagnetic compatibility of multimedia equipment - Emission requirements EN55032: 2013, Class B
ESD Electrostatic discharge immunity test Air ±8kV; Contact ± 4kV IEC61000-4-2, Criteria A
Radiated, radio-frequency, electromagnetic field immunity test 3 V/m IEC61000-4-3, Criteria A
Fast Transient and Burst Immunity ±0.5kV IEC61000-4-4, Criteria A
Surge Immunity ±0.5kV IEC61000-4-5, Criteria A
Immunity to conducted disturbances, induced by radio-frequency fields 3V IEC61000-4-6, Criteria A
Power Magnetic Field Immunity 50Hz/ 1A/m IEC61000-4-8, Criteria A
DIMENSION and PHYSICAL CHARACTERISTICS
Parameter Type Value
Material
case
potting
PCB
plastic, (UL94 V-0)
silicone, (UL94 V-0)
FR4, (UL94 V-0)
Dimension (LxWxH) 11.5 x 8.5 x 17.5mm
Weight 4.0g typ.
continued on next page
EMC Filtering Suggestion according to EN55032
C1
L1 R-78Bxx-2.0
C2
GND
+VOUT
GND
+VIN
GND
+V
out
+V
in
EN55022 C1 C2 L1
Class A 4.7µF 50V MLCC 1206 N/A 3.3µH Choke
Class B 10µF 50V MLCC 1210 4.7µF 50V MLCC 1206 10µH Choke
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DC/DC Converter
Specifications (measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
R-78B-2.0
Series
INSTALLATION and APPLICATION
Positive to Negative
Part Input Output Output Efficiency @ full load External
Number Voltage Range Voltage Current @ min Vin @ max. Vin Capacitor
[VDC] [VDC] [mA] [%] [%] [C1 / C2]
R-78B1.2-2.0 4.75 - 32 -1.2 -1000 86 86 10µF / 10µF
R-78B1.5-2.0 4.75 - 32 -1.5 -1000 74 87 10µF / 10µF
R-78B1.8-2.0 4.75 - 32 -1.8 -1000 76 88 10µF / 10µF
R-78B2.5-2.0 4.75 - 32 -2.5 -1000 79 89 10µF / 10µF
R-78B3.3-2.0 4.75 - 32 -3.3 -1000 83 89 10µF / 10µF
R-78B5.0-2.0 6.5 - 32 -5 -1000 86 90 10µF / 10µF
R-78B9.0-2.0 11 - 32 -9 -1000 90 91 10µF / 10µF
R-78B12-2.0 15 - 32 -12 -1000 91 92 10µF / 10µF
R-78B15-2.0 18 - 32 -15 -1000 92 93 10µF / 10µF
C1
Vin
GND
Vout
C2
0V
0V
+Vin
-Vout
R-78B-2.0
Dimension Drawing (mm)
Pin Connections
Pin # Single
1 +Vin
2 GND
3 +Vout
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
Bottom View
Top View
321 321
8.511.5
17.5
4.10
2.00
3.21 5.08
0.51
0.64+0.10/-0.05
0.64+0.10/-0.05
2.54
2.54
Marking
embossed logo
Recommended Footprint Details
www.recom-power.com REV.: 4/2019 I-6
DC/DC Converter
Specifications (measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
R-78B-2.0
Series
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.
PACKAGING INFORMATION
Parameter Type Value
Packaging Dimension (LxWxH) tube 520.0 x 25.1 x 10.6mm
Packaging Quantity 42pcs
Storage Temperature Range -55°C to +125°C
Storage Humidity non-condensing 95% RH max.
