Features
Switching
Regulator
Description
•
•
•
•
•
•
•
Efficiency up tpo 94%, no need for heatsinks
Pin-out compatible with LM78XX linears
Low profile (L/W/H=11.5 x 7.5 x 10.2mm)
Wide input range
Short circuit protection, thermal shutdown
Non-standard outputs available as specials
Low ripple and noise
DC/DC Converter
R-78-1.0
The R-78xx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators
and are pin compatible. Efficiencies of up to 94% 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.
1.0 Amp
SIP3
Single Output
Selection Guide
Part
Number
R-781.8-1.0
R-782.5-1.0
R-783.3-1.0
R-785.0-1.0
Input
Voltage Range
[VDC]
4.75 - 18
4.75 - 18
4.75 - 18
6.5 - 18
Output
Voltage
[VDC]
1.8
2.5
3.3
5.0
Output
Current
[A]
1.0
1.0
1.0
1.0
Efficiency
@ min Vin @ max. Vin
[%]
[%]
82
76
87
81
90
84
94
89
Model Numbering
R-78__-1.0
Output Voltage
Output Current
IEC/EN60950-1 certified
EN55032 compliant
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Quiescent Current
Internal Power Dissipation
Minimum Load
(1)
Internal Operating Frequency
Output Ripple and Noise
Absolute Maximum
Capacitive Load
measured at 20MHz BW
1 second start up, no external components
<1 second start up + diode protection circuit
0%
280kHz
350kHz
430kHz
Condition
nom. Vin=12VDC
Vin = min. to max. at 0% load
Min.
4.75VDC
Typ.
5mA
Max.
18VDC
7mA
0.4W
20mVp-p 30mVp-p
220µF
6800µF
Notes:
Note1: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 10mA is recommended
continued on next page
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REV.: 2/2018
I-1
R-78xx-1.0
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
5Vout
3.3Vout
2.5Vout
1.8Vout
Efficiency [%]
70
60
50
40
30
20
10
0
5
7
5Vout
3.3Vout
2.5Vout
1.8Vout
9
11
13
15
17 18
Ripple [mV]
35
30
25
20
15
10
5
0
5
7
9
11
13
15
17 18
Input Voltage [VDC]
Input Voltage [VDC]
Efficiency vs. Load (max. Vin)
100
90
80
Ripple vs. Load (max. Vin)
50
45
40
5Vout
3.3Vout
2.5Vout
1.8Vout
Efficiency [%]
60
50
40
30
20
10
0
0
10
20
5Vout
3.3Vout
2.5Vout
1.8Vout
30
40
50
60
70
80
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 [%]
Output Load [%]
Efficiency vs. Load (min. Vin)
100
90
80
Ripple vs. Load (min. Vin)
50
45
40
5Vout
3.3Vout
2.5Vout
1.8Vout
Efficiency [%]
Ripple [mV]
5Vout
3.3Vout
2.5Vout
1.8Vout
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 [%]
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REV.: 2/2018
Output Load [%]
I-2
R-78xx-1.0
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
10% to 100% load
100% <-> 50% load
Value
±2.0% typ / ±3.0% max.
±0.2% typ. / ±0.4% max.
±0.4% typ. / ±0.6% max.
±85mV typ. / ±100mV max.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
nom. Vin= 12VDC
Condition
Value
continuous, automatic recovery
+V
IN
100mA max.
Optional Diode Protection Circuit
Optional Protection 1:
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-78xx-1.0
+V
OUT
Optional Protection 2:
GND
GND
+V
out
=
+V
out
- 0.3V
+V
IN
R-78xx-1.0
+V
OUT
+V
IN
R-78xx-1.0
GND
GND
+V
out
=
+V
out
- 0.3V
GND
GND
+V
IN
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
GND
R-78xx-1.0
Condition
Value
-40°C to +85°C
+100°C
±0.015%/°C
with derating (see graph)
GND
0.1m/s, vertical
non-condesing
+25°C
+71°C
70°C/W
2000m
95% RH max.
PD2
13338 x 10
3
hours
3880 x 10
3
hours
according to MIL-HDBK-217F, G.B.
Derating Graph
100
80
60
40
30
20
0
-40
Output Power [%]
0
20
40
60
Ambient Temperature [°C]
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REV.: 2/2018
80
85
100
I-3
R-78xx-1.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC
RoHs 2+
Series
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
with external components
Contact ±6kV
3V/m
±1.0kV
3V
50Hz, 3A/m
Standard / Criterion
EN55032, Class A
EN55032, Class B
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
EMC Filter Suggestion according to EN55032 Class A and B
L1
+V
IN
C1
C2
R-78xx-1.0
+V
OUT
-V
IN
-V
OUT
Level
Class A
Class B
C1
10µF 100V MLCC
10µF 100V MLCC
C2
-
2.2µF 100V MLCC
L1
3.9µH choke
5.6µH 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
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.
R-78xx-1.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Dimension Drawing (mm)
Series
embossed logo
11.5
7.6
0.51
4.10
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
Recommended Footprint Details
INSTALLATION AND APPLICATION
High Efficiency, Isolated, Dual Unregulated Output
+V
IN
+V
IN
DC/DC Converter (1:1)
2.54
1 2 3
Bottom View
2.00
Top View
1 2 3
2.54
R-78xx-1.0
C1
C1
DC/DC Converter (1:1)
+V
out
+V
out
Com
Com
GND
GND
R-78xx-1.0
C2
C2
GND
GND
C1: optional
C2: required (further decoupling filtering may
C1: be necessary between the two converters)
optional
C2: required (further decoupling filtering may
be necessary between the two converters)
DC/DC Converter
Range Regulated Output
(1:1)
DC/DC Converter (1:1)
- Medical grade isolated dual outputs
- Wide input range 6.5V to 18V
- High Efficiency,isolated dual12V Battery powered devices
Medical grade suitable for outputs
- Wide input range 6.5V to 18V
- High Efficiency, suitable for 12V Battery powered devices
Isolated (up to 6kVDC), Wide Input
+V
IN
+V
IN
C1
C1
R-78xx-1.0
R-78xx-1.0
C2
C2
+V
out
+V
out
GND
GND
- High isolation voltage
- Improved loading / line regulation
- Wide isolation voltage
High input voltage range
- Point-of-load architecture
Improved loading / line regulation
- Wide input voltage range
- Point-of-load architecture
C1, C2: optional
C1, C2: optional
GND
GND
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REV.: 2/2018
I-5
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