The R-78Cxx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators
and are pin compatible. Efficiencies of up to 96% means that very little energy is wasted as heat and
the high input voltage is a useful feature.
Selection Guide
Part
Number
R-78C1.8-1.0
R-78C3.3-1.0
R-78C5.0-1.0
R-78C9.0-1.0
R-78C12-1.0
R-78C15-1.0
Input
Voltage Range
[VDC]
5 - 42
7 - 42
8 - 42
12 - 42
15 - 42
18 - 42
Output
Voltage
[VDC]
1.8
3.3
5
9
12
15
Output
Current
[A]
1.0
1.0
1.0
1.0
1.0
1.0
Efficiency
@ min Vin @ max. Vin
[%]
[%]
80
71
89
79
93
85
95
90
96
92
96
94
1.0 Amp
SIP3
Single Output
Model Numbering
R-78C__-1.0
Output Voltage
Output Current
IEC60950-1 certified
EN60950-1 certified
EN55032 compliant
Min.
Vout +3V
1.8VDC
0%
1mA
280kHz
20MHz BW
Vin= 24VDC Vout=1.8-15
full load
420kHz
75mVp-p 120mVp-p
30mVp-p
470µF
6800µF
350kHz
Specifications
(measured at Ta= 25°C, minimum load, otherwise specified)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Output Voltage Range
Minimum Load
(1)
Quiescent Current
Internal Operating Frequency
Output Ripple and Noise
(2)
Max. Capacitive Load
Condition
Typ.
Max.
42VDC
15VDC
with normal start-up time, no external components
with <1 second start-up time + diode protection circuit
Notes:
Note1: No load operation will not damage these devices, however they may not meet all specifictions
A minimum load of 10mA is required
Note2: Measurements are made with a 10µF MLCC across output. (low ESR)
REGULATIONS
Parameter
Output Voltage Accuracy
Line Voltage Regulation
Load Voltage Regulation
Transient Response
Condition
full load
max. Vin, full load
max. Vin. and 10% to 100% load
100% <-> 50% load
100% <-> 10% load
REV.: 2/2018
Value
±2% typ. / ±3% max.
±0.2% typ.
±0.4% typ.
±75mV max.
±200mV max.
I-1
www.recom-power.com
R-78C-1.0
DC/DC Converter
Specifications
(measured at Ta= 25°C, minimum load, otherwise specified)
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
nom. Vin = 24VDC
Series
Condition
Value
continuous, automatic recovery
65mA typ.
External Zener Diode Calculation for Output Over Voltage Protection
Minimum Zener Breakdown Voltage (VZmin)
≥
VOUTnom + 3% Accuracy
+V
IN
R-78Cxx-1.0
+V
OUT
R-78C Vout
1.8V
(1.85V max.)
3.3V
(3.4V max.)
5V
(5.15V max.)
9V
(9.27V max.)
12V
(12.36V max.)
15V
(15.45V max.)
Zener Voltage, Vz (V
z
min
)
2.0V
(1.90V)
3.6V
(3.42V)
5.6V
(5.32V)
10V
(9.50V)
13V
(12.35V)
14V
(13.30V)
17V
(16.15V)
Recommended Zener Diode
MMSZ679T1G
MMSZ4685T1G
MMSZ4690T1G
MMSZ4697T1G
MMSZ4700T1G / MMSZ4701T1G
MMSZ4704T1G
ENVIRONMENTAL
Parameter
Operating Temperature Range
Max. Case Temperature
Temperature Coefficient
Case Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
MIL-HDBK 217F
100
90
80
Condition
with derating (see graph)
Value
-40°C to +85°C
+100°C
0.015%/°C
70°C/W max.
2000m
non condensing
+25°C
+68°C
5% - 95% max., RH
PD2
8600 x 10 hours
3880 x 10³ hours
3
Derating Graph
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
68
85
Ambient Temperature [°C]
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
RoHS 2+
EAC
RU-AT.49.09571
continued on next page
www.recom-power.com
REV.: 2/2018
I-2
Report / File Number
1603123
Standard
IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM2:2013
RoHS 2011/65/EU + AM2015/863
TP TC 004/2011
R-78C-1.0
DC/DC Converter
Specifications
(measured at Ta= 25°C, minimum load, otherwise specified)
EMC Compliance
Electromagnetic compatibility of multimedia equipment -
Emission requirements
Series
Condition
with external filter
Standard / Criterion
EN55032, Class A, B
EMC Filter suggestion according to EN55032 Class A and B
L1
+V
IN
C1
C2
R-78C-1.0
+V
OUT
-V
IN
Level
Class A
Class B
-V
OUT
C1
10µF 100V MLCC
10µF 100V MLCC
C2
-
10µF 100V MLCC
L1
5.6µH
12µH
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
case
potting
Value
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
11.6 x 8.5 x 10.4mm
2g typ.
Dimension Drawing (mm)
embossed logo
11.6
8.5
10.4
Marking
0.51
0.70
+0.10/-0.05
5.08
0.25
±0.05
Recommended Footprint
Pin Connections
Pin # Function
1
+Vin
2
GND
3
+Vout
Tolerance: xx.x= ±0.50mm
xx.xx= ±0.25mm
3.21
2.54
4.10
1 2 3
Bottom View
2.00
Top View
1 2 3
2.54
www.recom-power.com
REV.: 2/2018
I-3
R-78C-1.0
DC/DC Converter
Specifications
(measured at Ta= 25°C, minimum load, otherwise specified)
INSTALLATION AND APPLICATION
Positive to Negative Converter
1
3
Pin Connections
Pin # Negative
1
+Vin
2
-Vout
3
GND
Series
+V
IN
R-78Cxx-1.0
2
C2
10µF/50V
C1
10µF/50V
GND
GND
-V
OUT
Positive
+Vin
GND
+Vout
Selection Guide - Negativ Output
Part
Number
R-78C1.8-1.0
R-78C3.3-1.0
R-78C5.0-1.0
R-78C9.0-1.0
R-78C12-1.0
R-78C15-1.0
Input
Voltage Range
(3)
[VDC]
5 - 38
7 - 37
8 - 35
12 - 31
15 - 28
18 - 25
Output
Voltage
[VDC]
-1.8
-3.3
-5
-9
-12
-15
Output
Current
[A]
-0.8
-0.8
-0.7
-0.6
-0.5
-0.5
Efficiency
@ min Vin @ max. Vin
[%]
[%]
69
70
77
80
79
83
85
87
87
89
89
90
Notes:
Note3: When using the R-78C as positive-to-negative converter, the input voltage range is limited
Dual Output (two Converters) with Negativ Output
+V
IN
1
R-78Cxx-1.0
2
3
+V
OUT
10µF/50V
C1
GND
GND
R-78Cxx-1.0
10µF/50V
3
C2
2
-V
OUT
Notes:
Note4: When connecting two R-78C together to create a dual output, both connectors must be connected in parallel
Connecting them in series might cause start-up problems of the second R-78C
www.recom-power.com
REV.: 2/2018
I-4
R-78C-1.0
DC/DC Converter
Specifications
(measured at Ta= 25°C, minimum load, otherwise specified)
High Efficiency Regulated Outputs
+5VDC
REC3-0515DRW/H2/A
+12VDC
+V
IN
Series
R-78Cxx-1.0
C1
C2
Com
-12VDC
-V
IN
C1: optional; C2: Required (further decoupling filtering may
be neccesary between the two conversters)
-Triple Outputs
- Wide Input Range 8V to 42V
- High System Efficiency, Suitable for 12V, 24V, 36V
Battery Powered Devices
Standard Application Circuit
+V
IN
R-78Cxx-1.0
C1
(optional)
10µF MLCC
(optional)
+V
OUT
C2
GND
GND
To protect the converter during power-up, use soft start power supply.
Low Voltage AC Input, Regulated DC Output
+24VDC unreg.
(27-40VDC)
R-78Cxx-1.0
C2
+5V
REG
~
24VAC +/-20%
+
C1
~
-
GND
-Low Voltage AC Input
-Regulated and protected DC Output
PACKAGING INFORMATION
Parameter
Packaging Dimension (LxWxH)
Packaging Quantity
Storage Temperature Range
Type
tube
Value
520 x 18.2 x 11.2mm
42pcs.
-55°C to +125°C
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. The
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 cause
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 unauthorized
use of RECOM products in such safety-critical applications.
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