www.recom-power.com REV.: 3/2019 I-1
Features
Switching
Regulator
• Efficiency up to 96%, no need for heatsinks
• Pin-out compatible with LM78XX linears
• Low profile (L*W*H=11.6*8.5*10.4mm)
• Wide input range (5V - 42V)
• Short circuit protection, thermal shutdown
• Low ripple and noise
• IEC/EN60950 certified
• Positive to negative converter
R-78C-1.0
Description
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.
DC/DC Converter
1.0 Amp
SIP3
Single Output
IEC60950-1 certified
EN60950-1 certified
EN55032 compliant
Specifications (measured at Ta= 25°C, minimum load, otherwise specified)
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Input Voltage Range Vout +3V 42VDC
Output Voltage Range 1.8VDC 15VDC
Minimum Load (1) 0%
Quiescent Current 1mA
Internal Operating Frequency 280kHz 350kHz 420kHz
Output Ripple and Noise (2) 20MHz BW Vin= 24VDC Vout=1.8-15
full load
75mVp-p
30mVp-p
120mVp-p
Max. Capacitive Load
with normal start-up time, no external components
with <1 second start-up time + diode protection circuit
470µF
6800µF
Selection Guide
Part Input Output Output Efficiency
Number Voltage Range Voltage Current @ min Vin @ max. Vin
[VDC] [VDC] [A] [%] [%]
R-78C1.8-1.0 5 - 42 1.8 1.0 80 71
R-78C3.3-1.0 7 - 42 3.3 1.0 89 79
R-78C5.0-1.0 8 - 42 5 1.0 93 85
R-78C9.0-1.0 12 - 42 9 1.0 95 90
R-78C12-1.0 15 - 42 12 1.0 96 92
R-78C15-1.0 18 - 42 15 1.0 96 94
Notes:
Note1: No load operation will not damage these devices, however they may not meet all specifications
A minimum load of 10mA is required
Note2: Measurements are made with a 10µF MLCC across output. (low ESR)
REGULATIONS
Parameter Condition Value
Output Voltage Accuracy full load ±2% typ. / ±3% max.
Line Voltage Regulation max. Vin, full load ±0.2% typ.
Load Voltage Regulation max. Vin. and 10% to 100% load ±0.4% typ.
Transient Response 100% <-> 50% load
100% <-> 10% load
±75mV max.
±200mV max.
Model Numbering
Output Voltage Output Current
R-78C__-1.0
www.recom-power.com REV.: 3/2019 I-2
DC/DC Converter
Specifications (measured at Ta= 25°C, minimum load, otherwise specified)
R-78C-1.0
Series
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) continuous, automatic recovery
Short Circuit Input Current nom. Vin = 24VDC 65mA typ.
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range with derating (see graph) -40°C to +85°C
Max. Case Temperature +100°C
Temperature Coefficient 0.015%/°C
Case Thermal Impedance 70°C/W max.
Operating Altitude 2000m
Operating Humidity non condensing 5% - 95% max., RH
Pollution Degree PD2
MTBF MIL-HDBK 217F +25°C
+68°C
8600 x 103 hours
3880 x 10³ hours
-40 -20 0 20 40 70
68 85
60-30 -10 10 30 50 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Output Load [%]
Ambient Temperature [°C]
Derating Graph
External Zener Diode Calculation for Output Over Voltage Protection
+VIN +VOUT
R-78Cxx-1.0
R-78C Vout Zener Voltage, Vz (Vzmin) Recommended Zener Diode
1.8V (1.85V max.) 2.0V (1.90V) MMSZ679T1G
3.3V (3.4V max.) 3.6V (3.42V) MMSZ4685T1G
5V (5.15V max.) 5.6V (5.32V) MMSZ4690T1G
9V (9.27V max.) 10V (9.50V) MMSZ4697T1G
12V (12.36V max.) 13V (12.35V) 14V (13.30V) MMSZ4700T1G / MMSZ4701T1G
15V (15.45V max.) 17V (16.15V) MMSZ4704T1G
Minimum Zener Breakdown Voltage (VZmin) ≥ VOUTnom + 3% Accuracy
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 + AM2:2013
RoHS 2+ RoHS 2011/65/EU + AM2015/863
EAC RU-AT.49.09571 TP TC 004/2011
continued on next page
www.recom-power.com REV.: 3/2019 I-3
DC/DC Converter
Specifications (measured at Ta= 25°C, minimum load, otherwise specified)
R-78C-1.0
Series
EMC Compliance
Condition
Standard / Criterion
Electromagnetic compatibility of multimedia equipment -
Emission requirements
with external filter
(see filter suggestion below) EN55032, Class A and B
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter Value
Material case
potting
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
Package Dimension (LxWxH) 11.6 x 8.5 x 10.4mm
Package Weight 2g typ.
Bottom View
Top View
embossed logo
321 321
2.00
8.511.6
0.70+0.10/-0.05
3.215.08
10.44.10
0.51
0.25±0.05
Marking
2.54
2.54
Dimension Drawing (mm)
Recommended Footprint
Pin Connections
Pin # Function
1 +Vin
2 GND
3 +Vout
Tolerance: xx.x= ±0.50mm
xx.xx= ±0.25mm
EMC Filter Suggestion according to EN55032
R-78C-1.0
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 L1
R-78C3.3-1.0 10µF
100V MLCC
5.6µH choke
RLS-567
R-78C5.0-1.0
MODEL C1 C2 L1
R-78C3.3-1.0 10µF
100V MLCC
10µF
100V MLCC
12µH choke
RLS-126
R-78C5.0-1.0
Notes:
Note3: Filter suggestions are valid for indicated part numbers only. For other part numbers, please contact RECOM tech support for advice
www.recom-power.com REV.: 3/2019 I-4
DC/DC Converter
Specifications (measured at Ta= 25°C, minimum load, otherwise specified)
R-78C-1.0
Series
INSTALLATION AND APPLICATION
Pin Connections
Pin # Negative Positive
1 +Vin +Vin
2 -Vout GND
3 GND +Vout
C1
10µF/50V
C2
10µF/50V
1
2
3
GND
-VOUT
+VIN
GND
R-78Cxx-1.0
C1
10µF/50V
C2
10µF/50V
1
2
3
GND
+VIN +VOUT
-VOUT
GND
R-78Cxx-1.0
2
3
R-78Cxx-1.0
Positive to Negative Converter
Dual Output (two Converters) with Negative Output
Selection Guide - Negative Output
Part Input Output Output Efficiency
Number Voltage Range (3) Voltage Current @ min Vin @ max. Vin
[VDC] [VDC] [A] [%] [%]
R-78C1.8-1.0 5 - 38 -1.8 -0.8 69 70
R-78C3.3-1.0 7 - 37 -3.3 -0.8 77 80
R-78C5.0-1.0 8 - 35 -5 -0.7 79 83
R-78C9.0-1.0 12 - 31 -9 -0.6 85 87
R-78C12-1.0 15 - 28 -12 -0.5 87 89
R-78C15-1.0 18 - 25 -15 -0.5 89 90
Notes:
Note5: 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
Notes:
Note4: When using the R-78C as positive-to-negative converter, the input voltage range is limited
www.recom-power.com REV.: 3/2019 I-5
DC/DC Converter
Specifications (measured at Ta= 25°C, minimum load, otherwise specified)
R-78C-1.0
Series
PACKAGING INFORMATION
Parameter Type Value
Packaging Dimension (LxWxH) tube 520 x 18.2 x 11.2mm
Packaging Quantity 42pcs
Storage Temperature Range -55°C to +125°C
C2C1
+VIN
-VIN
+5VDC
Com
-12VDC
+12VDC
R-78Cxx-1.0
REC3-0515DRW/H2/A
-Triple Outputs
- Wide Input Range 8V to 42V
- High System Efficiency, Suitable for 12V, 24V, 36V
Battery Powered Devices
C1: optional; C2: Required (further decoupling filtering may
be neccesary between the two conversters)
10µF MLCC
(optional)
(optional)
To protect the converter during power-up, use soft start power supply.
C1 C2
+VIN
GND
+VOUT
GND
R-78Cxx-1.0
+24VDC unreg.
(27-40VDC)
24VAC +/-20% C1 C2
+5VREG
GND
R-78Cxx-1.0
~+
-
~
-Low Voltage AC Input
-Regulated and protected DC Output
High Efficiency Regulated Outputs
Standard Application Circuit
Low Voltage AC Input, Regulated DC Output
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.
