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Features
Switching
Regulator
• Efficiency up to 96%, no need for heatsinks
• Build-in diode protection circuit
• Low profie (LxWxH= 11.5 x 8.5 x 17.5mm)
• Continuous short circuit protection
• RoHS compliant
• IEC/EN60950 certified
DC/DC Converter
R-78W-0.5
Description
The R-78W series offers wired 0.5A switching regulators which are ideally suited to offer a stable
voltage supply without the need for a PCB for applications like high power LED lighting, battery
powered systems, cooling systems, or fans. Due to the high efficiencies of up to 96% there is no
need for a heat sink. The compact modules feature fully protected outputs and draw only 1mA under
no load conditions.
0.5 Amp
SIP3 Wired
Single Output
Selection Guide
Part
Number
R-78W3.3-0.5
R-78W5.0-0.5
R-78W9.0-0.5
R-78W12-0.5
Input
Output
Output
Efficiency Max. Capacitive
Voltage Range Voltage
Current
@ min Vin
Load (1)
[VDC] [VDC] [A] [%] [µF]
6.5 - 32
3.3
0.5
88
220
6.5 - 32
5.0
0.5
93
220
11 - 32
9.0
0.5
95
220
15 - 32
12.0
0.5
96
220
Notes:
Note1: Max. Cap Load is tested at nominal input and full resistive load
6800µF with <1sec start-up time
Model Numbering
R-78W__-0.5
Output Voltage
Output Current
IEC60950-1 certified
EN60950-1 certified
Specifications (measured at Ta= 25°C, full load, nominal input voltage and after warm-up)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Quiescent Current
Internal Power Dissipation
Minimum Load (2)
Internal Operating Frequency
Output Ripple and Noise (3)
Condition
nom. Vin = 24VDC
20MHz BW limited
Min.
6.5VDC
0%
280kHz
Typ.
24VDC
5mA
Max.
32VDC
7mA
0.4W
330kHz
50mVp-p
380kHz
75mVp-p
Notes:
Note2: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 6mA is recommended
Note3: Measurements are made with a 100nF MLCC across output (low ESR)
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REV.: 3/2018
I-1

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DC/DC Converter
Specifications (measured at Ta= 25°C, full load, nominal input voltage and after warm-up)
REGULATIONS
Parameter
Output Accuracy
Condition
Line Voltage Regulation
low line to high line, full load
Load Voltage Regulation
Transient Response
10% to 100% load
50% - 100% Load, ΔIo/Δt 25mA/µs
10% - 100% Load, ΔIo/Δt 25mA/µs
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Reverse Current Protection
Type
internal structure
R-78W-0.5
Series
Type
all models
3.3VDC, 5VDC
9VDC, 12VDC
3.3VDC, 5VDC
9VDC, 12VDC
all models
Value
±2% typ. / ±3% 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.
Value
continuous, automatic recovery
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
Derating Graph
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+VIN Controller
+VOUT
GND GND
An internal blocking diode can prevent reverse current flow backwards into the output,
as this can damage the converter when it is powered down.
Condition
with derating @ natural convection 0.1m/s (see graph)
-40°C to +85°C ambient
0.1m/s, vertical
non-condensing
according to MIL-HDBK-217F, G.B.
+ 25°C
100
90
80
70
60
50
40
30
20
10
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
Ambient Temperature [°C] 71 85
REV.: 3/2018
Value
-40°C to +85°C
+100°C
0.015%/°C
70°C/W typ.
2000m
95% RH max.
PD2
9368 x 103 hours
I-2

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DC/DC Converter
Specifications (measured at Ta= 25°C, full load, nominal input voltage and after warm-up)
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Report / File Number
Information Technology Equipment, General Requirements for Safety (LVD)
LVD1407030-1
EAC
RoHs 2+
RU-AT.49.09571
R-78W-0.5
Series
Standard
IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM:2013
TP TC 004/2011
RoHS 2011/65/EU + AM2015/863
DIMENSION and PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
Dimension Drawing (mm)
Type
case
potting
Value
non-conductive black plastic, (UL94 V-0)
epoxy, (UL94 V-0)
17.5 x 11.5 x 8.5mm
4.8g typ.
11.5
embossed logo
8.5
Marking
Ø0.76
Ø1.56
Wire/cable information
# Function Wire color Type AWG Strands
1 +Vin
red UL-1430 22 14/0.16
2 GND
black UL-1430 22 14/0.16
3 +Vout brown UL-1430 22 14/0.16
Tolerance:  xx.x= ±0.5mm
 xx.xx= ±0.25mm
123
Bottom View
PACKAGING INFORMATION
Parameter
Packaging Dimension (LxWxH)
Packaging Quantity (3)
Storage Temperature Range
Storage Humidity
Type
cardboard box
non-condensing
Notes:
Note3: 5 bubble packs each containing 5pcs in a cardboard box
Value
140.0 x 130.0 x 65.0mm
25pcs.
-55°C to +125°C
95% RH max.
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.
www.recom-power.com
REV.: 3/2018
I-3