Features
Switching
Regulator
Description
•
•
•
•
•
•
•
Efficiency up to 97%, no heatsinks required
Pin-out 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)
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.
1.0 Amp
SIP3
Single Output
Selection Guide
Part
Number
R-78B1.5-1.0
(1)
R-78B1.8-1.0
(1)
R-78B2.5-1.0
(1)
R-78B3.3-1.0
(1)
R-78B5.0-1.0
(1)
R-78B6.5-1.0
(1)
R-78B9.0-1.0
(1)
R-78B12-1.0
(1)
R-78B15-1.0
(1)
Input
Voltage Range
[VDC]
4.75 - 26
4.75 - 26
4.75 - 32
4.75 - 32
6.5 - 32
9.0 - 32
12 - 32
16 - 32
20 - 32
Output
Voltage
[VDC]
1.5
1.8
2.5
3.3
5.0
6.5
9.0
12
15
Output
Current
[A]
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Efficiency
@ min Vin
@ max. Vin
[%]
[%]
77
71
80
74
85
78
89
83
93
88
94
90
95
93
96
95
97
96
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
Absolute Maximum Input
Voltage Range
Quiescent Current
Internal Power Dissipation
Internal Operating Frequency
Minimum Load
(2)
Output Ripple and Noise
(3)
Ref. Back Ripple Current
20MHz BW
1.5Vout to 6.5Vout
9Vout to 15Vout
EN55032 compliant
IEC/EN60950-1 certified
Condition
1.5Vout , 1.8Vout
2.5Vout to 15Vout
nom. Vin= 24VDC
Vout= 1.5VDC
nom. Vin= 24VDC
Min.
Typ.
Max.
26VDC
34VDC
5mA
280kHz
0%
330kHz
7mA
0.65W
380kHz
15mVp-p 20mVp-p
25mVp-p 35mVp-p
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
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REV.: 2/2018
I-1
R-78Bxx-1.0(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Vin (full load)
100
90
80
Series
Ripple vs. Vin (full load)
50
45
40
35
15Vout
12, 9Vout
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8, 1.5Vout
Efficiency [%]
70
Ripple [mV]
15Vout
12Vout
9Vout
6.5Vout
5Vout
9
13
17
21
25
3.3Vout
2.5Vout
1.8Vout
1.5Vout
29 32
60
50
40
30
20
10
0
4.75
30
25
20
15
10
5
0
4.75
9
13
17
21
25
29 32
Input Voltage [VDC]
Input Voltage [VDC]
Efficiency vs. Load (max. Vin)
100
90
80
Ripple vs. Load (max. Vin)
50
45
40
35
15Vout
12, 9Vout
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8, 1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
0
10
20
30
40
50
15Vout
12Vout
9Vout
6.5Vout
5Vout
60
70
80
3.3Vout
2.5Vout
1.8Vout
1.5Vout
90
100
Ripple [mV]
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
Output Load [%]
Efficiency vs. Load (min. Vin)
100
90
80
Ripple vs. Load (min. Vin)
50
45
40
35
15, 12, 9Vout
6.5Vout
2.5, 3.3, 5Vout
1.5, 18Vout
Efficiency [%]
70
60
50
40
30
20
10
0
0
10
20
30
40
15Vout
12Vout
9, 6.5Vout
5Vout
50
60
70
3.3Vout
2.5Vout
1.8Vout
1.5Vout
80
90
100
Ripple [mV]
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
Output Load [%]
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REV.: 2/2018
I-2
R-78Bxx-1.0(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
Transient Response
Series
Condition
100% load
low line to high line, full load
10% to 100% load
1.5Vout to 6.5Vout
9Vout to 15Vout
1.5Vout to 6.5Vout
9Vout to 15Vout
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.
100% <-> 50% load
Recovery Time
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
Condition
below 100mW
nom. Vin= 24VDC
+V
IN
Value
continuous, automatic recovery
60mA max.
+V
OUT
Optional Diode Protection Circuit
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).
R-78Bxx-1.0
Optional Protection 1:
Optional Protection 2:
GND
GND
+V
OUT
=
+V
OUT
- 0.3V
+V
IN
R-78Bxx-1.0
+V
OUT
+V
IN
R-78Bxx-1.0
GND
GND
+V
OUT
=
+V
OUT
- 0.3V
+V
OUT
GND
GND
GND
GND
Protection Circuit
+V
IN
+V
IN
GND
GND
C1
R-78Bxx-1.0
R-78Bxx-1.0
To protect the converter during power-up, use C1=22µF if Vin>30
+V
IN
R-78Bxx-1.0
C1
C2
RD-0512D
+5V @ 0.4A
+12V @ 84mA
0V Com
ENVIRONMENTAL
Parameter
GND
Condition
with derating (see graph)
• Wide input range 4.75V to 34V
• ±12V outputs for analogue circuits, e.g. instrumentation amplifier
• +5V output for digital circuits
-12V @ 84mA
Value
-40°C to +85°C
+100°C
±0.015%/°C
60°C/W
2000m
95% RH max.
Operating Temperature Range
Maximum Case Temperature
optional;
C1
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
+V
IN
RP10-4812SEW
C2 required (further decoupling filtering may
be necessary between the two converters)
0.1m/s, vertical
non-condensing
according to MIL-HDBK-217F, G.B.
continued on next page
R-78B5.0-1.0
C1
REV.: 2/2018
C2
+25°C
+12V @ 0.1A
PD2
8593 x 10
3
hours
+5V @ 1A
www.recom-power.com
GND
I-3
C2, C3: optional
R-78Bxx-1.0(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Derating Graph
100
90
80
Series
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
71 85
Ambient Temperature [°C]
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC
RoHs 2+
Report / File Number
1603123
RU-AT.49.09571
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
EMC Compliance
Electromagnetic compatibility of multimedia equipment -
Emission requirements
ESD Electrostatic discharge immunity test
Radiated, radio-frequency, electromagnetic field immunity test
Condition
with external components
Air ±8kV, Contact ±4kV
3V/m
Standard / Criterion
EN55032, Class A
EN55032, Class B
EN61000-4-2, Criteria A
EN61000-4-3, Criteria A
EMC Filter Suggestion according EN55032 Class A and Class B
L1
+V
IN
C1
C2
R-78Bxx-1.0
+V
OUT
-V
IN
Level
Class A
Class B
-V
OUT
C1
10µF 100V MLCC
10µF 100V MLCC
C2
4.7µF 50V MLCC
10µF 100V MLCC
L1
3.9µH choke
12µH choke
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
continued on next page
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REV.: 2/2018
I-4
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.
R-78Bxx-1.0(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Dimension Drawing (mm)
with suffix “/L” bent pins
Series
embossed logo
embossed logo
8.5
11.5
8.5
11.5
Pin Connections
Pin #
Single
1
+Vin
2
GND
3
+Vout
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
0.25
±0.05
17.5
19.0
0.51
17.5
Marking
Marking
0.51
90
-9
3°
1.50
+0.10/-0.05
4.10
0.70
0.25
±0.05
0.70
+0.10/-0.05
6.10
Recommended Footprint Details
2.54
Bottom View
Recommended Footprint Details
1 2 3
1 2 3
Top View
1 2 3
2.00
3.21
5.08
2.00
2.54
Bottom View
Top View
5.08
4.10
2.54
1 2 3
2.54
INSTALLATION AND APPLICATION
Positive to Negative Converter
0V
0V
C1 and C2 are required and should
be fitted close to the converter pins.
Maximum capacitive load including
C2 is 220µF
+V
IN
1
R-78Bxx-1.0
2
C1
3
C2
-V
OUT
Pin Connections
Pin # Negative
1
+Vin
2
-Vout
3
GND
Positive
+Vin
GND
+Vout
continued on next page
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REV.: 2/2018
I-5
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