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Features
Switching
Regulator
• Efficiency up to 97%, no heatsinks required
• Pin compatible with LM78XX linears
• Low profile (L/W/H=11.5 x 8.5 x 17.5mm)
• Wide input range
• Short circuit protection, thermal shutdown
• Low ripple and noise
• „L“ version with 90° pins
• Positive to negative converter
R-78B-1.0(L)
Description
The R-78Bxx-1.0 series high efficiency switching regulators are ideally suited to replace 78xx
linear regulators and are pin compatible. The efficiency of up to 97% means that very little energy is
wasted as heat so there is no need for any heat sinks with their additional space and mounting costs.
The L-Version with 90° pins allows direct replacement for laid-flat regulators where component height
is at a premium. Low ripple and noise figures and a short circuit input current of typically only 10mA
round off the specifications of this versatile converter series.
DC/DC Converter
1.0 Amp
SIP3
Single Output
EN55032 compliant
IEC/EN60950-1 certified
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Absolute Maximum Input
Voltage
1.5Vout , 1.8Vout
2.5Vout to 15Vout
26VDC
34VDC
Quiescent Current nom. Vin= 24VDC 5mA 7mA
Internal Power Dissipation Vout= 1.5VDC 0.65W
Internal Operating Frequency
nom. Vin= 24VDC 280kHz 330kHz 380kHz
Minimum Load (2) 0%
Output Ripple and Noise (3) 20MHz BW 1.5Vout to 6.5Vout
9Vout to 15Vout
15mVp-p
25mVp-p
20mVp-p
35mVp-p
Ref. Back Ripple Current 150mA
200mAp-p
Absolute Maximum
Capacitive Load
1 second start up, no external components
<1 second start up + diode protection circuit
470µF
6800µF
continued on next page
Selection Guide
Part Input Output Output Efficiency
Number Voltage Range Voltage Current @ min Vin @ max. Vin
[VDC] [VDC] [A] [%] [%]
R-78B1.5-1.0 (1) 4.75 - 26 1.5 1.0 77 71
R-78B1.8-1.0 (1) 4.75 - 26 1.8 1.0 80 74
R-78B2.5-1.0 (1) 4.75 - 32 2.5 1.0 85 78
R-78B3.3-1.0 (1) 4.75 - 32 3.3 1.0 89 83
R-78B5.0-1.0 (1) 6.5 - 32 5.0 1.0 93 88
R-78B6.5-1.0 (1) 9.0 - 32 6.5 1.0 94 90
R-78B9.0-1.0 (1) 12 - 32 9.0 1.0 95 93
R-78B12-1.0 (1) 16 - 32 12 1.0 96 95
R-78B15-1.0 (1) 20 - 32 15 1.0 97 96
Notes:
Note1: add suffix “L” for 90° bent pins, e.g. R-78B5.0-1.0L
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Notes:
Note2: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 10mA is recommended
Note3: Output Ripple and Noise is tested from 10% to 100% load
Model Numbering
Output Voltage Pinning
Output Current
R-78B__-1.0(L)
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DC/DC Converter
R-78Bxx-1.0(L)
Series
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Vin (full load)
Efficiency vs. Load (max. Vin)
Efficiency vs. Load (min. Vin)
Ripple vs. Vin (full load)
Ripple vs. Load (max. Vin)
Ripple vs. Load (min. Vin)
4.75 9 13 17 21 25 29 32
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Input Voltage [VDC]
3.3Vout
2.5Vout
1.8Vout
1.5Vout
15Vout
12Vout
9Vout
6.5Vout
5Vout
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 [%]
3.3Vout
2.5Vout
1.8Vout
1.5Vout
15Vout
12Vout
9Vout
6.5Vout
5Vout
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 [%]
3.3Vout
2.5Vout
1.8Vout
1.5Vout
15Vout
12Vout
9, 6.5Vout
5Vout
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Input Voltage [VDC]
4.75 9 13 17 21 25 29 32
3.3Vout
2.5Vout
1.8, 1.5Vout
15Vout
12, 9Vout
6.5Vout
5Vout
0 10 20 30 40 50 60 70 80 90
100
50
30
40
20
35
45
25
15
10
5
0
Ripple [mV]
Output Load [%]
3.3Vout
2.5Vout
1.8, 1.5Vout
15Vout
12, 9Vout
6.5Vout
5Vout
0 10 20 30 40 50 60 70 80 90
100
50
35
45
25
30
40
20
15
10
5
0
Ripple [mV]
Output Load [%]
15, 12, 9Vout
6.5Vout
2.5, 3.3, 5Vout
1.5, 18Vout
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78Bxx-1.0(L)
Series
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) below 100mWcontinuous, automatic recovery
Short Circuit Input Current nom. Vin= 24VDC 60mA max.
REGULATIONS
Parameter Condition Value
Output Accuracy 100% load ±2.0% typ / ±3.0% max.
Line Regulation low line to high line, 100% load 1.5Vout to 6.5Vout
9Vout to 15Vout
±0.2% typ. / ±0.4% max.
±0.1% typ. / ±0.2% max.
Load Regulation 10% to 100% load 1.5Vout to 6.5Vout
9Vout to 15Vout
±0.4% typ. / ±0.6% max.
±0.25% typ. / ±0.4% max.
Transient Response 100% <-> 50% load
Recovery Time
±100mV typ. / ±150mV max.
1.0ms typ. / 1.5ms max.
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range with derating (see graph) -40°C to +85°C
Maximum Case Temperature +100°C
Temperature Coefficient ±0.015%/K
Thermal Impedance 0.1m/s, vertical 60K/W
Operating Altitude 2000m
Operating Humidity non-condensing 95% RH max.
Pollution Degree PD2
MTBF according to MIL-HDBK-217F, G.B. +25°C 8593 x 103 hours
continued on next page
To protect the converter during power-up, use C1=22µF if Vin>30V
C1
+Vin +Vout
GNDGND
R-78Bxx-1.0
GND
+V
out
+V
in
Protection Circuit
Optional Diode Protection Circuit
Optional Protection 1: Optional Protection 2:
+Vin +Vout
GNDGND
+Vin +Vout=
+Vout - 0.3V
R-78Bxx-1.0
GND
+V
out
+V
in
R-78Bxx-1.0
GNDGND
GND
+V
out
+V
in
+Vin +Vout
GNDGND
+Vin +Vout=
+Vout - 0.3V
R-78Bxx-1.0
GND
+V
out
+V
in
R-78Bxx-1.0
GNDGND
GND
+V
out
+V
in
Add a blocking diode to Vout if
current can flow backwards into
the output, as this can damage the
converter when it is powered down.
The diode can either be fitted
across the device if the source is
low impedance or fitted in series
with the output (recommended).
www.recom-power.com REV.: 4/2019 I-4
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78Bxx-1.0(L)
Series
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Report / File Number
Standard
Information Technology Equipment, General Requirements for Safety
1603123 IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM 2:2013
EAC RU-AT.49.09571 TP TC 004/2011
RoHS 2+ RoHS 2011/65/EU + AM2015/863
EMC Compliance Condition Standard / Criterion
Electromagnetic compatibility of multimedia equipment -
Emission requirements
with external filter
(see filter suggestion below) EN55032, Class A and B
ESD Electrostatic discharge immunity test Air ±8kV, Contact ±4kV EN61000-4-2, Criteria A
Radiated, radio-frequency, electromagnetic field immunity test 3V/m EN61000-4-3, Criteria A
-40 -20 0 20 40 70
71 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
EMC Filter Suggestion according to EN55032
R-78Bxx-1.0
C
1
C
2
GND
+Vout
+Vin
GND
+V
out
GND
+V
in
L
1
Component List Class A Component List Class B
MODEL C1 C2 L1
R-78B5.0-1.0(L) 10µF
100V MLCC
4.7µF
50V MLCC
3.9µH choke
RLS-397
R-78B12-1.0(L)
R-78B15-1.0(L)
MODEL C1 C2 L1
R-78B5.0-1.0(L) 10µF
100V MLCC
10µF
100V MLCC
12µH choke
RLS-126
R-78B12-1.0(L)
R-78B15-1.0(L)
Notes:
Note4: Filter suggestions are valid for indicated part numbers only. For other part numbers, please contact RECOM tech support for advice
www.recom-power.com REV.: 4/2019 I-5
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78Bxx-1.0(L)
Series
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter Type Value
Material case
potting
Package Dimension (LxWxH) 11.5 x 8.5 x 17.5mm
Package Weight 4g typ.
INSTALLATION AND APPLICATION
Pin Connections
Pin # Negative Positive
1 +Vin +Vin
2 -Vout GND
3 GND +Vout
Positive to Negative Converter
C1 and C2 are required and should
be fitted close to the converter pins.
Maximum capacitive load including
C2 is 220µF
continued on next page
Bottom View
Top View
321 321
8.511.5
17.5
4.10
2.00
0.51
0.70+0.10/-0.05 0.25±0.05
2.54
2.54
Marking
embossed logo
3.21 5.08
embossed logo
Bottom View
Top View
3
21
3
21
2.00
19.0
4.10
6.10
90-93°
Marking
8.5
11.5
0.70+0.10/-0.05
5.08
17.5
1.50
0.25±0.05
0.51
2.54
2.54
Dimension Drawing (mm)
Pin Connections
Pin # Single
1 +Vin
2 GND
3 +Vout
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
Recommended Footprint Details Recommended Footprint Details
with suffix “L” bent pins
123
+Vin
-Vout
C2
C1
GNDGND
R-78Bxx-1.0
2
31
+Vin
-Vout
C2
C1
+Vout
GNDGND
R-78Bxx-1.0
2
31
R-78Bxx-1.0
2
31
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78Bxx-1.0(L)
Series
Dual Output (two Converters) with Negative Output
Selection Guide - Negative Output
Notes:
Note5: Maximum Capacitive Load including C2 is 220µF
Part Input Output Output Efficiency External Capacitor
Number Voltage Range Voltage Current @ min Vin @ max. Vin C1 C2 (5)
[VDC] [VDC] [A] [%] [%]
R-78B1.5-1.0 4.75 - 28 -1.5 -0.6 70 68 10µF/50V 22µF/6.3V
R-78B1.8-1.0 4.75 - 28 -1.8 -0.6 72 72 10µF/50V 22µF/6.3V
R-78B2.5-1.0 4.75 - 28 -2.5 -0.6 75 77 10µF/50V 22µF/6.3V
R-78B3.3-1.0 4.75 - 28 -3.3 -0.6 77 80 10µF/50V 22µF/6.3V
R-78B5.0-1.0 6.5 - 28 -5.0 -0.6 83 85 10µF/50V 22µF/10V
R-78B6.5-1.0 8.0 - 26 -6.5 -0.4 84 87 10µF/50V 10µF/10V
R-78B9.0-1.0 8.0 - 18 -9.0 -0.4 88 89 10µF/25V 10µF/25V
R-78B12-1.0 8.0 - 18 -12 -0.3 89 90 10µF/25V 10µF/25V
R-78B15-1.0 8.0 - 18 -15 -0.3 89 91 10µF/25V 10µF/25V
continued on next page
High Efficiency Multiple Output
Application Examples
C2
C2
C1
C1
+Vin
GND
+Vin
-Vin
-12V @ 84mA
+12V @ 84mA
0V Com
RD-0512D
RP10-4812SEW
+5V @ 0.4A
+12V @ 0.1A
+5V @ 1A
+3.3V @ 1A
0V @ 1A
• Wide input range 4.75V to 34V
• ±12V outputs for analogue circuits, e.g. instrumentation amplifier
• +5V output for digital circuits
- High isolation voltage - 1.6kV
- Improved load / line regulation
- Wide input voltage range - 18~75VDC
- Point-of-load architecture
- C1 is required. Further decoupling filtering
may be necessary between the converters
C1 optional;
C2 required (further decoupling filtering may
be necessary between the two converters)
C2, C3: optional
C3
R-78Bxx-1.0
GND
+V
out
+V
in
R-78B5.0-1.0
GND
+V
out
+V
in
R-78B3.3-1.0
GND
+V
out
+V
in
+Vin
-Vout
C2
C1
GNDGND
R-78Bxx-1.0
2
31
+Vin
-Vout
C2
C1
+Vout
GNDGND
R-78Bxx-1.0
2
31
R-78Bxx-1.0
2
31
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78Bxx-1.0(L)
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.
Isolated, Wide Input Range, Distributed Power Arcitecture (Point-of-Load)
PACKAGING INFORMATION
Parameter Type Value
Packaging Dimension (LxWxH) tube without suffix
with suffix “L”
520.0 x 25.1 x 10.6mm
520.0 x 26.1 x 15.8mm
Packaging Quantity tube 42pcs
Storage Temperature Range -55°C to +125°C
Storage Humidity 95% RH max.
C2
C2
C1
C1
+Vin
GND
+Vin
-Vin
-12V @ 84mA
+12V @ 84mA
0V Com
RD-0512D
RP10-4812SEW
+5V @ 0.4A
+12V @ 0.1A
+5V @ 1A
+3.3V @ 1A
0V @ 1A
• Wide input range 4.75V to 34V
• ±12V outputs for analogue circuits, e.g. instrumentation amplifier
• +5V output for digital circuits
- High isolation voltage - 1.6kV
- Improved load / line regulation
- Wide input voltage range - 18~75VDC
- Point-of-load architecture
- C1 is required. Further decoupling filtering
may be necessary between the converters
C1 optional;
C2 required (further decoupling filtering may
be necessary between the two converters)
C2, C3: optional
C3
R-78Bxx-1.0
GND
+V
out
+V
in
R-78B5.0-1.0
GND
+V
out
+V
in
R-78B3.3-1.0
GND
+V
out
+V
in