Features
Switching
Regulator
Description
•
•
•
•
•
•
•
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
DC/DC Converter
R-78-0.5
The R-78xx-Series high efficiency switching regulators are ideally suited to replace 78xx linear regul-
tors 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.
0.5 Amp
SIP3
Single Output
Selection Guide
Part
Number
R-781.5-0.5
R-781.8-0.5
R-782.5-0.5
R-783.3-0.5
R-785.0-0.5
R-786.5-0.5
R-789.0-0.5
R-7812-0.5
R-7815-0.5
Input
Output
Output
Voltage Range
Voltage
Current
[VDC]
[VDC]
[A]
(1)
4.75 - 30
1.5
0.5
4.75 - 32
1.8
0.5
4.75 - 32
2.5
0.5
(2)
4.75 - 32
3.3
0.5
6.5 - 32
5.0
0.5
8.0 - 32
6.5
0.5
11 - 32
9.0
0.5
15 - 32
12
0.5
18 - 32
15
0.5
Notes:
Note1: 1.5V Output can be ustable with Vin>30VDC
Note2: Refer to Transient Response on page PI-3
Efficiency
@ min Vin
@ max. Vin
[%]
[%]
73
63
82
71
87
77
91
81
94
86
95
88
96
92
97
94
97
95
IEC/EN60950-1 certified
EN55032 compliant
Model Numbering
R-78__-0.5
Output Voltage
Output Current
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REV.: 3/2018
I-1
R-78xx-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Quiescent Current
Internal Power Dissipation
Minimum Load
(3)
Internal Operating Frequency
20MHz BW, without output
capacitor
20MHz BW
(4)
Absolute Maximum
Capacitive Load
1.5 - 6.5VDC
9 - 15.5VDC
1.5VDC
1.8 - 15.5VDC
0%
280kHz
330kHz
20mVp-p
30mVp-p
15mVp-p
25mVp-p
380kHz
30mVp-p
40mVp-p
20mVp-p
35mVp-p
220µF
6800µF
nom. Vin=24VDC
Series
Condition
1.5Vout
1.8 - 15.5Vout
nom. Vin= 24VDC
Min.
4.75VDC
Typ.
30VDC
32VDC
5mA
Max.
34VDC
7mA
0.4W
Output Ripple and Noise
1 second start up, no external components
<1 second start up + diode protection circuit
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)
Efficiency vs. Vin (full load)
100
90
80
Ripple vs. Vin (full load)
50
45
40
15Vout
12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
0
5
15, 12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
10
15
20
25
30 34
Ripple [mV]
35
30
25
20
15
10
5
0
0
5
10
15
20
25
30 34
Input Voltage [VDC]
Input Voltage [VDC]
Efficiency vs. Load (max. Vin)
100
90
80
Ripple vs. Load (nom. Vin)
50
45
40
15Vout
12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
Efficiency [%]
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
15Vout
12Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
90
100
Ripple [mV]
70
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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continued on next page
REV.: 3/2018
Output Load [%]
I-2
R-78xx-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Load (min. Vin)
100
90
80
Series
Ripple vs. Load (min. Vin)
50
45
40
15Vout
12Vout
9, 3.3Vout
5Vout
1.8Vout
1.5Vout
Efficiency [%]
Ripple [mV]
15, 12Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
0
10
20
30
40
50
60
70
80
90
100
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
Output Load [%]
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
Transient Response
(5)
Condition
100% load
low line to high line, full load
10% to 100% load
100% <-> 50% load
100% <-> 10% load
Notes:
Note5: The R.783.3-0.5 requires Vin>5.5V to meet the Transient Response specifications
1.5V - 6.5V
9V - 15.5V
1.5V - 6.5V
9V - 15.5V
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.
±75mV typ.
±100mV max.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
nom. Vin= 24VDC
+V
IN
Condition
R-78xx-0.5
Value
continuous, automatic recovery
+V
OUT
60mA max.
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).
Optional Protection 1:
Optional Protection 2:
GND
GND
+V
out
=
+V
out
- 0.3V
+V
IN
R-78xx-0.5
+V
OUT
+V
IN
R-78xx-0.5
GND
GND
+V
out
=
+V
out
- 0.3V
+V
OUT
GND
6800µF
GND
REV.:
DC/DC Converter (1:1)
3/2018
GND
GND
+V
IN
+V
IN
GND
GND
www.recom-power.com
+V
IN
R-78xx-0.5
R-78xx-0.5
Application example:
Driving a high capacitive load
I-3
+Vout
R-78xx-0.5
R-78xx-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
according to MIL-HDBK-217F, G.B.
+25°C
non-condensing
0.1m/s, vertical
Series
Condition
with derating (see graph)
Value
-40°C to +85°C
+100°C
±0.015%/°C
70°C/W
2000m
95% RH max.
PD2
26163 x 10
3
hours
Derating Graph
100
80
60
40
20
0
-40
Output Power [%]
0
20
40
60
71
Ambient Temperature [°C]
80
85
100
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
Fast Transient and Burst Immunity
Immunity to conducted disturbances, induced by radio-frequency fields
Power Magnetic Field Immunity
Condition
Standard / Criterion
EN55032, Class B
Contact ±6kV
3V/m
±1.0kV
3V
50Hz, 1A/m
continued on next page
EN61000-4-2, Criteria A
EN61000-4-3, Criteria A
EN61000-4-4, Criteria A
EN61000-4-6, Criteria A
EN61000-4-8, Criteria A
www.recom-power.com
REV.: 3/2018
I-4
R-78xx-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
EMC Filter suggestion according to EN55032 Class A and Class B
L1
Series
+V
IN
C1
C2
R-78xx-0.5
+V
OUT
-V
IN
Level
Class A
Class B
-V
OUT
C1
10µF 100V MLCC
10µF 100V MLCC
C2
3.3µF 100V MLCC
3.3µF 100V MLCC
L1
3.9µH choke
5.6µH choke
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
Type
case
potting
PCB
Value
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
FR4, (UL94 V-0)
11.5 x 7.55 x 10.2mm
1.9g typ.
Dimension Drawing (mm)
embossed logo
11.5
7.6
0.51
10.2
Marking
Pin Connections
Pin #
Single
1
+Vin
2
GND
3
+Vout
0.25
±0.05
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
0.70
+0.10/-0.05
5.08
3.21
4.10
Recommended Footprint Details
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REV.: 3/2018
2.54
1 2 3
Bottom View
2.00
Top View
1 2 3
2.54
I-5
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