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.
3
EAR
rranty
Selection Guide
Part
Number
R-78W3.3-0.5
R-78W5.0-0.5
R-78W9.0-0.5
R-78W12-0.5
Input
Voltage Range
(VDC)
6.5 - 32
6.5 - 32
11 - 32
15 - 32
Output
Voltage
(VDC)
3.3
5.0
9.0
12.0
Output
Current
(mA)
500
500
500
500
Efficiency
@ min. Vin
(%)
88
93
95
96
Max. Capacitive
Load
(1)
(µF)
220
220
220
220
Notes:
Note1: 6800µF with <1sec start-up time
Specifications
(measured at TA= 25°C, full load, nominal input voltage and after warm-up)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Output Current
(2)
Quiescent Current
Internal Operating Frequency
Efficiency
Internal Power Dissipation
Output Ripple and Noise
Notes:
Note2:
20MHz BW limited
50mVp-p
0% Load
280kHz
Condition
Min.
6.5VDC
6mA
Typ.
24VDC
5mA
330kHz
Max.
32VDC
500mA
7mA
380kHz
0.4W
75mVp-p
see Selection Guide
IEC-60950-1 Certified
EN-60950-1 Certified
Operation under no load will not damage the device, however they may not meet all
specifications. A minimum load of 6mA is recommended.
REGULATIONS
Parameter
Output Accuracy
Line Voltage Regulation
Load Voltage Regulation
Transient Response
low line to high line, full load
10% to 100% load
50% - 100% Load,
ΔIo/Δt
25mA/µs
10% - 100% Load,
ΔIo/Δt
25mA/µs
Condition
Type
all models
3.3V, 5V
9V, 12V
3.3V, 5V
9V, 12V
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.
www.recom-power.com
REV.: 2/2017
PA-1
R-78W-0.5
DC/DC Converter
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Series
Type
Value
continuous, automatic recovery
Specifications
(measured at TA= 25°C, full load, nominal input voltage and after warm-up)
Reverse Current Protection:
+V
IN
-V
IN
Controlled IC
+V
OUT
-V
OUT
An internal blocking diode can prevent reverse current flow backwards into the output,
as this can damage the converter when it is powered down.
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Humidity
MTBF
-40°C to +85°C ambient
surface of case
non-condensing
Condition
with derating
Value
-40°C to +85°C
+100°C
0.015%/°C
70°C/W typ.
95%, RH max.
9368 x 10
3
hours
Derating Graph
100
80
60
40
20
0
-40
Output Power (%)
-20
0
10
20
30
40
50
60
Ambient Temperature (°C)
70
71
80
85
90
100
SAFETY AND CERTIFICATIONS
Certificate Type
Information Technology Equipment
General Requirements for Safety
PA-2
Report / File Number
LVD1407030-1
REV.: 2/2017
Standard
IEC-60950-1, 2nd Edition, 2009
EN-60950-1, 2nd Edition, 2011
www.recom-power.com
R-78W-0.5
DC/DC Converter
DIMENSION and PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
Series
Type
case
potting
Specifications
(measured at TA= 25°C, full load, nominal input voltage and after warm-up)
Value
non-conductive black plastic (UL94-V0)
epoxy (UL94-V0)
17.5 x 11.5 x 8.5mm
4.8g typ.
Dimension Drawing (mm)
11.5
xxxx
0.51
17.5
105.0 ±5
R-78W
-xx0.5
Marking
Wired Connections
Wired Color
1, red
2, black
3, brown
Type
UL-1430, AWG22
UL-1430, AWG22
UL-1430, AWG22
Wire Composition
41/0.16
41/0.16
41/0.16
Function
+Vin
GND
+Vout
10.0 ±2
Ø0.76
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.35mm
Bottom View
1
2
3
8.5
Ø0.76
PACKAGING INFORMATION
Parameter
Packaging Dimension (LxWxH)
Packaging Quantity
(3)
Storage Temperature Range
Notes:
Note3: 5 bubble packs each containing 5pcs in a cardboard box.
Type
cardboard box
Value
140.0 x 130.0 x 65.0mm
25pcs.
-55°C to +125°C
The product information and specifications are subject to change without prior notice. RECOM products are not authorized for use in safety-critical applications (such as life support) without RECOM’s explicit written
consent. A safety-critical application is defined as an application where a failure of a RECOM product may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The buyer
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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