Features
Switching
Regulator
Description
•
•
•
•
•
•
•
•
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
DC/DC Converter
R-78B-2.0
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.
2.0 Amp
SIP3
Single Output
Selection Guide
Part
Number
R-78B1.2-2.0
R-78B1.5-2.0
R-78B1.8-2.0
R-78B2.5-2.0
R-78B3.3-2.0
R-78B5.0-2.0
R-78B9.0-2.0
R-78B12-2.0
R-78B15-2.0
Input
Voltage Range
[VDC]
4.75 - 32
4.75 - 32
4.75 - 32
4.75 - 32
4.75 - 32
6.5 - 32
11 - 32
15 - 32
18 - 32
Output
Voltage
[VDC]
1.2
1.5
1.8
2.5
3.3
5
9
12
15
Output
Current
[mA]
2000
2000
2000
2000
2000
2000
2000
2000
2000
Efficiency @ full load
Max. Capacitive
@ min Vin @ max. Vin
Load
(1)
[%]
[%]
[µF]
72
87
3300
79
90
3300
80
91
3300
84
92
2300
86
92
1800
90
94
820
93
95
620
94
96
470
95
96
470
Notes:
Note1: Max. cap load is tested by nominal input and full resisitive load
IEC/EN62368-1 certified
EN55032 compliant
CB report, EAC
Model Numbering
R-78B__-2.0
Output Voltage
Output Current
www.recom-power.com
REV.: 3/2018
I-1
R-78B-2.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
BASIC CHARACTERISTICS
Parameter
Condition
1.2Vout - 3.3Vout
5Vout
9Vout
12Vout
15Vout
Series
Min.
4.75VDC
6.5VDC
11VDC
15VDC
18VDC
Typ.
Max.
Input Voltage Range
nom. Vin= 24VDC
24VDC
32VDC
Maximum Reverse Voltage
Inrush Current
Quiescent Current
Internal Power Dissipation
Start-up time
Rise Time
Internal Operating Frequency
Minimum Load
Output Ripple and Noise
(2)
20MHz BW
Vout
≤3.3VDC
Vout
≥5VDC
nom. Vin= 24VDC
0%
50mVp-p
75mVp-p
nom. Vin= 24VDC
Vout= 1.5VDC
2A
2mA
0.35W
10ms
50µs
460kHz
0V
0.8W
Notes:
Note2: Measurements are made with a 100nF MLCC across output (low ESR)
Efficiency vs. Load
100
90
80
R-78B3.3-2.0
100
90
80
R-78B5.0-2.0
Efficiency [%]
Efficiency [%]
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
4.75Vin
6Vin
9Vin
12Vin
15Vin
24Vin
32Vin
90
100
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
6.5Vin
12Vin
15Vin
24Vin
32Vin
90
100
Output Load [%]
Output Load [%]
R-78B5.0-2.0
100
90
80
Efficiency vs. Input Voltage
R-78B3.3-2.0
100
90
80
Efficiency [%]
60
50
40
30
20
10
0
4.75
9
13
17
21
25
29
32
Efficiency [%]
70
70
60
50
40
30
20
10
0
6.5
10
14
18
22
26
30 32
Input Voltage [VDC]
www.recom-power.com
REV.: 3/2018
Input Voltage [VDC]
I-2
R-78B-2.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
Series
Condition
100% load
low line to high line, full load
0% to 100% load
Value
±2.0% typ.
±0.5% typ.
±1.0% typ.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
Condition
below 100mW
nom. Vin= 24VDC
<5Vout
≥5Vout
Value
continuous, automatic recovery
50mA typ.
75mA typ.
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Operating Altitude
Operating Humidity
Pollution Degree
Vibration
MTBF
according to MIL-HDBK-217F, G.B.
+25°C
non-condensing
Condition
without derating (see graph)
Value
-40°C to +70°C
+105°C
0.02%/°C typ.
5000m
95% RH max.
PD2
10-55Hz, 2G, 30min along X, Y and Z axis
6349 x 10
3
hours
Derating Graph
(@ Chamber and natural convection 0.1m/s)
100
90
80
Output Load [%]
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0 10 20 30 40 50 60 70 80 90 100
85
Ambient Temperature [°C]
www.recom-power.com
REV.: 3/2018
I-3
R-78B-2.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Audio/video, information and communication technology equipment
Safety requirements (CB Scheme)
EAC
RoHs2+
Series
Report / File Number
L0339m38-B1-L
RU-AT.49.09571
Standard
IEC62368-1: 2014, 2nd Edition
EN62368-1: 2014
TP TC 004/2011
RoHS 2011/65/EU + AM2015/863
EMC Compliance
Electromagnetic compatibility of multimedia equipment - Emission requirements
Information technology equipment - Immunity characteristics - Limits and methods
of measurement
Electromagnetic compatibility of multimedia equipment - Emission requirements
ESD Electrostatic discharge immunity test
Radiated, radio-frequency, electromagnetic field immunity test
Fast Transient and Burst Immunity
Surge Immunity
Immunity to conducted disturbances, induced by radio-frequency fields
Power Magnetic Field Immunity
Condition
with external components
(see filter suggestion below)
Standard / Criterion
EN55032, Class A
EN55032, Class B
EN55024:2010
EN55032: 2013, Class B
Air ±8kV and Contact ± 4kV
3 V/m
±0.5kV
±0.5kV
3V
50Hz/ 1A/m
IEC61000-4-2, Criteria A
IEC61000-4-3, Criteria A
IEC61000-4-4, Criteria A
IEC61000-4-5, Criteria A
IEC61000-4-6, Criteria A
IEC61000-4-8, Criteria A
EMC Filtering Suggestion according to EN55032
L1
+V
IN
C1
C2
R-78Bxx-2.0
+V
OUT
-V
IN
EN55022
Class A
Class B
-V
OUT
C1
4.7µF 50V MLCC 1206
10µF 50V MLCC 1210
C2
N/A
L1
3.3µH Choke
4.7µF 50V MLCC 1206 10µH Choke
DIMENSION and PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
continued on next page
www.recom-power.com
REV.: 3/2018
I-4
Type
case
potting
PCB
Value
plastic, (UL94 V-0)
silicone, (UL94 V-0)
FR4, (UL94 V-0)
11.5 x 8.5 x 17.5mm
4.0g typ.
R-78B-2.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, nom. Vin, full load and after warm up unless otherwise specified)
Dimension Drawing (mm)
Series
embossed logo
11.5
8.5
17.5
Marking
Pin Connections
Pin #
Single
1
+Vin
2
GND
3
+Vout
0.64
+0.10/-0.05
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
0.51
0.64
+0.10/-0.05
4.10
2.54
Recommended Footprint Details
Bottom View
1 2 3
3.21
5.08
2.00
1 2 3
Top View
2.54
INSTALLATION and APPLICATION
Positive to Negative
0V
C1
R-78B-2.0
GND
+Vin
Vin
Vout
0V
C2
-Vout
Part
Number
R-78B1.2-2.0
R-78B1.5-2.0
R-78B1.8-2.0
R-78B2.5-2.0
R-78B3.3-2.0
R-78B5.0-2.0
R-78B9.0-2.0
R-78B12-2.0
R-78B15-2.0
www.recom-power.com
Input
Voltage Range
[VDC]
4.75 - 32
4.75 - 32
4.75 - 32
4.75 - 32
4.75 - 32
6.5 - 32
11 - 32
15 - 32
18 - 32
Output
Voltage
[VDC]
-1.2
-1.5
-1.8
-2.5
-3.3
-5
-9
-12
-15
Output
Current
[mA]
-1000
-1000
-1000
-1000
-1000
-1000
-1000
-1000
-1000
REV.: 3/2018
Efficiency @ full load
@ min Vin
@ max. Vin
[%]
[%]
86
86
74
87
76
88
79
89
83
89
86
90
90
91
91
92
92
93
External
Capacitor
[C1 / C2]
10µF / 10µF
10µF / 10µF
10µF / 10µF
10µF / 10µF
10µF / 10µF
10µF / 10µF
10µF / 10µF
10µF / 10µF
10µF / 10µF
I-5
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