Page 1
Features
• Efficiency up to 96%, no need for heatsinks!
• Build-in Diode Protection Circuit
• Low Profie (LxWxH= 11.5 x 8.5 x 17.5mm)
DC/DC Converter
Switching
• Continuous Short Circuit Protection
• RoHS compliant
Regulator
• IEC/EN-60950 Certified
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.
Selection Guide
Part Input Output Output Efficiency Max. Capacitive
Number Voltage Range Voltage Current @ min. Vin Load
(VDC) (VDC) (mA) (%) (µF)
R-78W3.3-0.5 6.5 - 32 3.3 500 88 220
R-78W5.0-0.5 6.5 - 32 5.0 500 93 220
R-78W9.0-0.5 11 - 32 9.0 500 95 220
R-78W12-0.5 15 - 32 12.0 500 96 220
Notes:
Note1: 6800µF with <1sec start-up time
(1)
R-78W-0.5
0.5 AMP
SIP3
Single
Output
E
A
Y
R
3
3
w
y
a
t
r
n
r
a
Specifications (measured at T
= 25°C, full load, nominal input voltage and after warm-up)
A
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Input Voltage Range 6.5VDC 24VDC 32VDC
Output Current
Quiescent Current 0% Load 5mA 7mA
Switching Frequency 280kHz 330kHz 380kHz
Efficiency see Selection Guide
Internal Power Dissipation
Output Ripple and Noise
Notes:
Note2: Operation under no load will not damage the device, however they may not meet all
specifications. A minimum load of 6mA is recommended.
(2)
20MHz BW limited 50mVp-p 75mVp-p
6mA 500mA
0.4W
REGULATIONS
Parameter Condition Type Value
Output Voltage Accuracy
Line Voltage Regulation low line to high line, full load
all models ±2% typ. / ±3% max.
3.3V, 5V
9V, 12V
±0.2% typ. / ±0.4% max.
±0.1% typ. / ±0.2% max.
IEC-60950-1 Certified
EN-60950-1 Certified
Load Voltage Regulation 10% to 100% load
Transient Response
50% - 100% Load, ΔIo/Δt 25mA/µs
10% - 100% Load, ΔIo/Δt 25mA/µs
3.3V, 5V
9V, 12V
all models
REV.: 0/2015www.recom-international.com
±0.4% typ. / ±0.6% max.
±0.25% typ. / ±0.4% max.
±75mV typ.
±100mV max.
Refer to Applications Notes
PA-1
Page 2
Value
100
R-78W-0.5
Certificate Type
Report / File Number
Standard
DC/DC Converter
Specifications (measured at T
A
= 25°C, full load, nominal input voltage and after warm-up)
Series
PROTECTIONS
Parameter Type Value
Short Circuit Protection (SCP) continuous, automatic recovery
Reverse Current Protection:
+V
IN
-V
IN
An internal blocking diode can prevent reverse current flow backwards into the output,
as this can damage the converter when it is powered down.
Controlled IC
+V
-V
OUT
OUT
ENVIRONMENTAL
Parameter Condition
Operating Temperature Range with derating -40°C to +85°C
Maximum Case Temperature +100°C
Storage Temperature Range -55°C to +125°C
Temperature Coefficient -40°C to +85°C ambient 0.015%/°C
Thermal Impedance surface of case 70°C/W typ.
Humidity non-condensing 95%, RH max.
3
MTBF 9368 x 10
Derating Graph
100
80
60
40
Output Power (%)
20
hours
0
-40 60 7071808590
50403020100-20
Ambient Temperature (°C)
SAFETY AND CERTIFICATIONS
IEC General Safety SPCLVD1407030-1 IEC-60950-1, 2nd Edition
EN General Safety SPCLVD1407030-1 EN-60950-1, 3rd Edition
PA-2
REV.: 0/2015 www.recom-international.com
Page 3
R-78W-0.5
DC/DC Converter
Specifications (measured at T
DIMENSIONS and PHYSICAL CHARACTERISTICS
Parameter Type Value
Material
Dimensions (LxWxH) 17.5 x 11.5 x 8.5mm
Weight 4.8g typ.
Packaging Dimensions (LxWxH) Cardboard Box 140 x 130 x 65mm
Packaging Quantity
Mechanical Dimensions (mm)
(3)
= 25°C, full load, nominal input voltage and after warm-up)
A
Case
Potting
Cardboard Box 25pcs.
Notes:
Note3: 5 bubble packs each containing 5pcs in a cardboard box.
Series
non-conductive black plastic
UL94V-0, Epoxy
11.5 17.5
R-78W
-xx0.5
xxxx
0.51
Bottom View
1
2
3
8.5
Front
10.0 ±2
105.0 ±5
Wired Connections
Wired Color Type Single
1, red UL-1430, AWG#22 +Vin
2, black UL-1430, AWG#22 GND
3, brown UL-1430, AWG#22 +Vout
Tolerance: ±0.5mm
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.
REV.: 0/2015www.recom-international.com
PA-3
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