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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
DC/DC 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.
Selection Guide
Part
Number
Input
Voltage Range
[VDC]
Output
Voltage
[VDC]
R-78B1.5-1.0 (1)
4.75 - 26
1.5
R-78B1.8-1.0 (1)
4.75 - 26
1.8
R-78B2.5-1.0 (1) 4.75 - 32
2.5
R-78B3.3-1.0 (1)
4.75 - 32 3.3
R-78B5.0-1.0 (1)
6.5 - 32 5.0
R-78B6.5-1.0 (1)
9.0 - 32 6.5
R-78B9.0-1.0 (1)
12 - 32 9.0
R-78B12-1.0 (1)
16 - 32 12
R-78B15-1.0 (1)
20 - 32 15
Output Efficiency
Current
@ min Vin @ max. Vin
[A]
[%] [%]
1.0 77 71
1.0 80 74
1.0 85 78
1.0
89 83
1.0
93 88
1.0
94 90
1.0
95 93
1.0
96 95
1.0
97 96
1.0 Amp
SIP3
Single Output
Model Numbering
R-78B__-1.0(L)
Output Voltage
Pinning
Output Current
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)
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 20mVp-p
25mVp-p 35mVp-p
Ref. Back Ripple Current
150mA 200mAp-p
Absolute Maximum
1 second start up, no external components
470µF
Capacitive Load
<1 second start up + diode protection circuit
6800µF
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
continued on next page
EN55032 compliant
IEC/EN60950-1 certified
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REV.: 4/2019
I-1

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R-78Bxx-1.0(L)
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
Efficiency vs. Vin (full load)
100
90
80
70
60
50
40
30
20
10
0
4.75
15Vout
12Vout
9Vout
6.5Vout
5Vout
9 13 17 21
Input Voltage [VDC]
3.3Vout
2.5Vout
1.8Vout
1.5Vout
25 29 32
Ripple vs. Vin (full load)
50
15Vout
3.3Vout
45
12, 9Vout
6.5Vout
2.5Vout
1.8, 1.5Vout
40 5Vout
35
30
25
20
15
10
5
0
4.75 9 13 17 21
Input Voltage [VDC]
25
29 32
Efficiency vs. Load (max. Vin)
100
90
80
70
60
50
40
30
20
10
0
0
15Vout
12Vout
9Vout
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
10 20 30 40 50 60 70 80 90 100
Output Load [%]
Ripple vs. Load (max. Vin)
50
15Vout
3.3Vout
45
12, 9Vout
6.5Vout
2.5Vout
1.8, 1.5Vout
40 5Vout
35
30
25
20
15
10
5
0
0 10 20 30 40 50 60 70 80 90 100
Output Load [%]
Efficiency vs. Load (min. Vin)
100
90
80
70
60
50
40
30
20
10
0
0
15Vout
12Vout
9, 6.5Vout
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
10 20 30 40 50 60 70 80 90 100
Output Load [%]
Ripple vs. Load (min. Vin)
50 15, 12, 9Vout
45
6.5Vout
2.5, 3.3, 5Vout
40 1.5, 18Vout
35
30
25
20
15
10
5
0
0 10 20 30 40 50 60 70 80 90 100
Output Load [%]
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REV.: 4/2019
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R-78Bxx-1.0(L)
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
Transient Response
Condition
100% load
low line to high line, 100% load
1.5Vout to 6.5Vout
9Vout to 15Vout
10% to 100% load
1.5Vout to 6.5Vout
9Vout to 15Vout
100% <-> 50% load
Recovery Time
Value
±2.0% typ / ±3.0% max.
±0.2% typ. / ±0.4% max.
±0.1% typ. / ±0.2% max.
±0.4% typ. / ±0.6% max.
±0.25% typ. / ±0.4% max.
±100mV typ. / ±150mV max.
1.0ms typ. / 1.5ms max.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
Optional Diode Protection Circuit
Condition
below 100mW
nom. Vin= 24VDC
Optional Protection 1:
Value
continuous, automatic recovery
+Vin
R-78Bxx-1.0
+Vin +Vout
+6Vo0utmA max.
GND
Optional Protection 2:
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).
Protection Circuit
+Vin
GND
+Vin
+Vin
R-78Bxx-1.0
+Vin +Vout
GND
R-78Bxx-1.0
+ViRn -78BGNxDx-1.0+Vout
+Vin +Vout
GND
GND
+Vout
+Vin
GND GND
+Vout=
++VVoouutt - 0.3V
R-78Bxx-1.0
+Vin +Vout
GND
GND
+Vout=
+Vout - 0.3V
GND
GND C1
GND
GND GND
To protect the converter during power-up, use C1=22µF if Vin>30V
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
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Condition
with derating (see graph)
0.1m/s, vertical
non-condensing
according to MIL-HDBK-217F, G.B.
continued on next page
REV.: 4/2019
+25°C
Value
-40°C to +85°C
+100°C
±0.015%/K
60K/W
2000m
95% RH max.
PD2
8593 x 103 hours
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R-78Bxx-1.0(L)
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
Derating Graph
100
90
80
70
60
50
40
30
20
10
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
Ambient Temperature [°C] 71 85
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC
RoHS 2+
EMC Compliance
Electromagnetic compatibility of multimedia equipment -
Emission requirements
ESD Electrostatic discharge immunity test
Radiated, radio-frequency, electromagnetic field immunity test
EMC Filter Suggestion according to EN55032
Report / File Number
1603123
RU-AT.49.09571
Condition
with external filter
(see filter suggestion below)
Air ±8kV, Contact ±4kV
3V/m
+Vin
C1
L1
C2
R-78Bxx-1.0
+Vin +Vout
GND
Standard
IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM 2:2013
TP TC 004/2011
RoHS 2011/65/EU + AM2015/863
Standard / Criterion
EN55032, Class A and B
EN61000-4-2, Criteria A
EN61000-4-3, Criteria A
+Vout
GND GND
Component List Class A
MODEL
C1
R-78B5.0-1.0(L)
R-78B12-1.0(L)
R-78B15-1.0(L)
10µF
100V MLCC
C2
4.7µF
50V MLCC
L1
3.9µH choke
RLS-397
Component List Class B
MODEL
C1
R-78B5.0-1.0(L)
R-78B12-1.0(L)
R-78B15-1.0(L)
10µF
100V MLCC
C2
10µF
100V MLCC
L1
12µH choke
RLS-126
Notes:
Note4: Filter suggestions are valid for indicated part numbers only. For other part numbers, please contact RECOM tech support for advice
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REV.: 4/2019
I-4

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R-78Bxx-1.0(L)
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
Type
case
potting
Value
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
11.5 x 8.5 x 17.5mm
4g typ.
Dimension Drawing (mm)
with suffix “L” bent pins
11.5
embossed logo
8.5
Marking
embossed logo
11.5 8.5
Marking
Pin Connections
Pin # Single
1 +Vin
2 GND
3 +Vout
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
0.70+0.10/-0.05
0.25±0.05
Recommended Footprint Details
Bottom View
123
3.21 5.08
123
Top View
2.54
0.70+0.10/-0.05
Bottom View
123
5.08
6.10
Recommended Footprint Details
Top View
1 23
2.54
INSTALLATION AND APPLICATION
Positive to Negative Converter
+Vin
R-78Bxx-1.0
13
2
C1
GND
+Vin
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R-78Bxx-1.0
13
2
C1
C2
-Vout
GND
123
continued on next page
C2 REV.: 4/2019
-Vout
C1 and C2 are required and should
be fitted close to the converter pins.
Maximum capacitive load including
C2 is 220µF
Pin Connections
Pin # Negative Positive
1 +Vin +Vin
2 -Vout GND
3 GND +Vout
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