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Features
Switching
Regulator
• Efficiency up to 97%, no need for heatsinks
• Pin-out compatible with LM78XX linears
• Very low profile
• 4.75V - 32V Wide input range
• Short circuit protection, thermal shutdown
• Low ripple and noise
• IEC/EN60950-1 certified
• Positive to negative converter
R-78-0.5
Description
The R-78xx-Series high efficiency switching regulators are ideally suited to replace 78xx linear
regultors 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. Low ripple and
noise figures and short circuit, overload and over-temperature protection round off the specifications of
this versatile converter series. This R-78xx-0.5 is fully certified to EN55032 EMC Standard and for
IEC/EN-60950-1 + AM2 Safety.
DC/DC Converter
0.5 Amp
SIP3
Single Output
IEC/EN60950-1 certified
EN55032 compliant
Selection Guide
Part Input Output Output Efficiency
Number Voltage Range Voltage Current @ min Vin @ max. Vin
[VDC] [VDC] [A] [%] [%]
R-781.5-0.5 4.75 - 30 (1) 1.5 0.5 73 63
R-781.8-0.5 4.75 - 32 1.8 0.5 82 71
R-782.5-0.5 4.75 - 32 2.5 0.5 87 77
R-783.3-0.5 4.75 (2) - 32 3.3 0.5 91 81
R-785.0-0.5 6.5 - 32 5.0 0.5 94 86
R-786.5-0.5 8.0 - 32 6.5 0.5 95 88
R-789.0-0.5 11 - 32 9.0 0.5 96 92
R-7812-0.5 15 - 32 12 0.5 97 94
R-7815-0.5 18 - 32 15 0.5 97 95
Notes:
Note1: 1.5V Output can be unstable with Vin>30VDC
Note2: Refer to Transient Response on page I-3
Model Numbering
Output Voltage Output Current
R-78__-0.5
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DC/DC Converter
R-78xx-0.5
Series
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Absolute Maximum Input Voltage 34VDC
Quiescent Current nom. Vin= 24VDC 5mA 7mA
Internal Power Dissipation 0.4W
Minimum Load (3) 0%
Internal Operating Frequency 280kHz 330kHz 380kHz
Output Ripple and Noise
20MHz BW, without output
capacitor
1.5 - 6.5VDC
9 - 15.5VDC
20mVp-p
30mVp-p
30mVp-p
40mVp-p
20MHz BW (4) 1.5VDC
1.8 - 15.5VDC
15mVp-p
25mVp-p
20mVp-p
35mVp-p
Absolute Maximum
Capacitive Load
1 second start up, no external components 220µF
<1 second start up + diode protection circuit 6800µF
continued on next page
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Vin (full load)
Efficiency vs. Load (max. Vin)
Ripple vs. Vin (full load)
Ripple vs. Load (nom. Vin)
0 5 10 15 20 25 30 34
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Input Voltage [VDC]
15, 12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
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 [%]
15Vout
12Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
0 5 10 15 20 25 30 34
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Input Voltage [VDC]
15Vout
12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
0 10 20 30 40 50 60 70 80 90 100
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Output Load [%]
15Vout
12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
Notes:
Note3: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 6mA is recommended
Note4: Measurements are made with a 100nF MLCC across output (low ESR)
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-0.5
Series
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) continuous, automatic recovery
Short Circuit Input Current nom. Vin= 24VDC 60mA max.
Optional Diode Protection Circuit
Optional Protection 1: Optional Protection 2:
REGULATIONS
Parameter Condition Value
Output Accuracy 100% load ±2.0% typ / ±3.0% max.
Line Regulation low line to high line, 100% load 1.5V - 6.5V
9V - 15.5V
±0.2% typ. / ±0.4% max.
±0.1% typ. / ±0.2% max.
Load Regulation 10% to 100% load 1.5V - 6.5V
9V - 15.5V
±0.4% typ. / ±0.6% max.
±0.25% typ. / ±0.4% max.
Transient Response (5) 100% <-> 50% load
100% <-> 10% load
±75mV typ.
±100mV max.
+Vin +Vout
GNDGND
+Vin +Vout=
+Vout - 0.3V
R-78xx-0.5
GND
+V
out
+V
in
GNDGND
R-78xx-0.5
GND
+V
out
+V
in
+Vin +Vout
GNDGND
+Vin +Vout=
+Vout - 0.3V
R-78xx-0.5
GND
+V
out
+V
in
GNDGND
R-78xx-0.5
GND
+V
out
+V
in
C1 C2
C1, C2: optional
C1, C2: optional
C1
- Isolated dual outputs
- Wide input range 4.75V to 34V
- High isolation voltage
- Improved load / line Regulation
- Wide input voltage
- Point-of-load architecture
C2
6800µF
+Vin +Vout
GND
+Vout
-Vout
Com
+Vout
GND
GND
+Vin
GND
+Vin
GND
R-78xx-0.5
GND
+V
out
+V
in
R-78xx-0.5
GND
+V
out
+V
in
R-78xx-0.5
GND
+V
out
+V
in
DC/DC Converter (1:1)
DC/DC Converter (1:1)
Application example:
Driving a high capacitive load
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).
Notes:
Note5: The R.783.3-0.5 requires Vin>5.5V to meet the Transient Response specifications
Efficiency vs. Load (min. Vin) Ripple vs. Load (min. Vin)
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 [%]
15, 12Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
0 10 20 30 40 50 60 70 80 90 100
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Output Load [%]
15Vout
12Vout
9, 3.3Vout
5Vout
1.8Vout
1.5Vout
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-0.5
Series
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 70K/W
Operating Altitude 2000m
Operating Humidity non-condensing 95% RH max.
Pollution Degree PD2
MTBF according to MIL-HDBK-217F, G.B. +25°C 26163 x 103 hours
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 Contact ±6kV EN61000-4-2, Criteria A
Radiated, radio-frequency, electromagnetic field immunity test 3V/m EN61000-4-3, Criteria A
Fast Transient and Burst Immunity ±1.0kV EN61000-4-4, Criteria A
Immunity to conducted disturbances, induced by radio-frequency fields
3V EN61000-4-6, Criteria A
Power Magnetic Field Immunity 50Hz, 3A/m EN61000-4-8, Criteria A
continued on next page
-40 60
71
80
85
10040200
0
20
40
60
80
100
Ambient Temperature [°C]
Output Power [%]
Derating Graph
www.recom-power.com REV.: 5/2019 I-5
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-0.5
Series
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter Type Value
Material
case
potting
PCB
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
FR4, (UL94 V-0)
Package Dimension (LxWxH) 11.5 x 7.55 x 10.2mm
Package Weight 1.9g typ.
Bottom View
123 123
2.54
2.54
2.00
11.5 7.55
0.70+0.10/-0.05
3.21
5.08
10.24.10
0.51
0.25±0.05
Marking
embossed logo
Top View
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
EMC Filter Suggestion according to EN55032
R-78xx-0.5
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-785.0-0.5 10µF
100V MLCC
3.3µF
100V MLCC
3.9µH choke
RLS-397
R-7812-0.5
MODEL C1 C2 L1
R-785.0-0.5 10µF
100V MLCC
3.3µF
100V MLCC
5.6µH choke
RLS-567
R-7812-0.5
Notes:
Note6: Filter suggestions are valid for indicated part numbers only. For other part numbers, please contact RECOM tech support for advice
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-0.5
Series
INSTALLATION AND APPLICATION
continued on next page
Dual Output (two Converters) with Negative Output
Selection Guide - Negative Output
Notes:
Note7: 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 (7)
[VDC] [VDC] [A] [%] [%]
R-781.5-0.5 4.75 - 28 -1.5 -0.4 68 67 10µF/35V 22µF/6.3V
R-781.8-0.5 4.75 - 28 -1.8 -0.4 71 70 10µF/50V 22µF/6.3V
R-782.5-0.5 4.75 - 28 -2.5 -0.4 75 76 10µF/50V 22µF/6.3V
R-783.3-0.5 4.75 - 28 -3.3 -0.4 77 80 10µF/50V 22µF/6.3V
R-785.0-0.5 4.75 - 28 -5.0 -0.4 79 84 10µF/50V 22µF/10V
R-786.5-0.5 5.0 - 26 -6.5 -0.3 81 86 10µF/50V 10µF/10V
R-789.0-0.5 8.0 - 18 -9.0 -0.2 87 89 10µF/50V 10µF/16V
R-7812-0.5 8.0 - 18 -12 -0.2 87 90 10µF/50V 10µF/25V
R-7815-0.5 8.0 - 18 -15 -0.2 87 81 10µF/50V 10µF/25V
Pin Connections
Pin # Negative Positive
1 +Vin +Vin
2 -Vout GND
3 GND +Vout
+Vin
-Vout
C2
C1
GNDGND
R-78xx-0.5
2
31
+Vin
-Vout
C2
C1
+Vout
GNDGND
R-78xx-0.5
2
31
R-78xx-0.5
2
31
+Vin
-Vout
C2
C1
GNDGND
R-78xx-0.5
2
31
+Vin
-Vout
C2
C1
+Vout
GNDGND
R-78xx-0.5
2
31
R-78xx-0.5
2
31
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
123
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-0.5
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.
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
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
use of RECOM products in such safety-critical applications.
High Efficiency, Isolated, Dual Unregulated Output
Isolated (up to 6kVDC), Wide Input Range Regulated Output
PACKAGING INFORMATION
Parameter Type Value
Packaging Dimension (LxWxH) tube 520.0 x 9.3 x 16.5mm
Packaging Quantity tube 42pcs
Storage Temperature Range -55°C to +125°C
Storage Humidity 95% RH max.
C1 C2
C1, C2: optional
C1, C2: optional
C1
- Isolated dual outputs
- Wide input range 4.75V to 34V
- High isolation voltage
- Improved load / line Regulation
- Wide input voltage
- Point-of-load architecture
C2
6800µF
+Vin +Vout
GND
+Vout
-Vout
Com
+Vout
GND
GND
+Vin
GND
+Vin
GND
R-78xx-0.5
GND
+V
out
+V
in
R-78xx-0.5
GND
+V
out
+V
in
R-78xx-0.5
GND
+V
out
+V
in
DC/DC Converter (1:1)
DC/DC Converter (1:1)
C1 C2
C1, C2: optional
C1, C2: optional
C1
- Isolated dual outputs
- Wide input range 4.75V to 34V
- High isolation voltage
- Improved load / line Regulation
- Wide input voltage
- Point-of-load architecture
C2
6800µF
+Vin +Vout
GND
+Vout
-Vout
Com
+Vout
GND
GND
+Vin
GND
+Vin
GND
R-78xx-0.5
GND
+V
out
+V
in
R-78xx-0.5
GND
+V
out
+V
in
R-78xx-0.5
GND
+V
out
+V
in
DC/DC Converter (1:1)
DC/DC Converter (1:1)
3.3µF~10µF*
Input capacitor required if Vin>26VDC (3.3µF) or if the supply is a battery
or other low impedance source (4.7µF~10µF)
Capacitor should be electolytic or MLCC with low ESR (≤1Ω)
*
C1
+Vin +Vout
GNDGND
R-78xx-0.5
GND
+V
out
+V
in
Standard Application Circuit