www.recom-power.com REV.: 5/2019 I-1
Features
Switching
Regulator
• Efficiency up to 96%, no heatsinks required
• Pin-out compatible with LM78XX linears
• Low profile (L/W/H=11.5 x 8.5 x 17.5mm)
• High input voltage range, up to 72V
• Short circuit protection, thermal shutdown
• Low ripple and noise
• „L“ version with 90° pins
• Positive to negative converter
R-78HB-0.5(L)
Description
The R-78HBxx-Series high efficiency, high input voltage switching regulators are ideally suited to replace
78xx linear regulators and are pin compatible. The efficiency of up to 96% means that very little energy
is wasted as heat so there is no need for any heat sinks with their additional space and mounting costs.
An input voltage range of up to 8:1 is unsurpassed by any other converter and allows the full stored
energy utilization of standard and high voltage batteries. The fully protected output is ideal for industrial
applications (especially for industry standard 24VDC bus supplies) and the L-Version with 90° pins
allows direct replacement for laid-flat regulators where component height is at a premium. Low ripple
and noise figures and a short circuit input current of typically only 15mA round off the specifications of
this versatile converter series. Typical applications include telecommunication, automotive, industrial,
aerospace and battery powered applications.
DC/DC Converter
0.5 Amp
SIP3
Single Output
IEC/EN60950-1 certified
EN55032 compliant
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Internal Input Filter 1µF capacitor
Absolute Maximum Input Voltage 75VDC
Quiescent Current nom. Vin= 48VDC 1mA 5mA
Internal Power Dissipation 0.65W
Minimum Load (2) 2%
continued on next page
Selection Guide
Part Input Output Output Efficiency
Number Voltage Range Voltage Current @ min Vin @ max. Vin
[VDC] [VDC] [A] [%] [%]
R-78HB3.3-0.5 9 - 72 3.3 0.5 82 76
R-78HB5.0-0.5 9 - 72 5.0 0.5 87 81
R-78HB6.5-0.5 9 - 72 6.5 0.5 91 84
R-78HB9.0-0.5 14 - 72 9.0 0.5 92 86
R-78HB12-0.5 17 - 72 12 0.5 94 89
R-78HB15-0.5 20 - 72 15 0.5 95 91
R-78HB24-0.3 36 - 72 24 0.3 96 92
Notes:
Note1: add suffix „L” for 90° bent pins, e.g. R-78B5.0-1.0L
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Notes:
Note2: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 10mA is recommended
Model Numbering
Output Voltage Pinning (1)
Output Current
R-78HB__- (L)
www.recom-power.com REV.: 5/2019 I-2
DC/DC Converter
R-78HBxx-0.5(L)
Series
Parameter Condition Min. Typ. Max.
Internal Operating Frequency
nom. Vin= 48VDC 120kHz 800kHz
Output Ripple and Noise 20MHz BW (10 - 100% load) 20mVp-p 60mVp-p
Absolute Maximum
Capacitive Load
1 second start up, no external components
<1 second start up + diode protection circuit
100µF
6800µF
continued on next page
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Vin (full load)
Switching Frequency vs. Load
Ripple vs. Vin (full load)
9 18 27 36 45 54 63 72
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Input Voltage [VDC]
24Vout
15Vout
12Vout
9Vout
6.5Vout
5Vout
3.3Vout
10 50 100 200 300 400 500
400
100
800
200
50
10
Frequency [kHz]
Output Current (mA)
24Vout
15Vout
12Vout
9Vout
6.5Vout
5Vout
3.3Vout
9 18 27 36 45 54 63 72
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Input Voltage [VDC]
24Vout
15, 12Vout
9Vout
6.5Vout
5Vout
3.3Vout
www.recom-power.com REV.: 5/2019 I-3
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78HBxx-0.5(L)
Series
REGULATIONS
Parameter Condition Value
Output Accuracy 100% load ±2.0% typ / ±3.0% max.
Line Regulation low line to high line, 100% load ±0.4% typ. / ±1.0% max.
Load Regulation 10% to 100% load ±0.3% typ. / ±0.6% max.
Transient Response (3) 100% <-> 50% load ±75mV typ. / ±100mV max.
Efficiency vs. Load (min. Vin) Ripple vs. Load (min. Vin)
0 10 20 30 40 50 60 70 80 90
100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
24, 15Vout
12Vout
9Vout
6.5Vout
5Vout
3.3Vout
0 10 20 30 40 50 60 70 80 90 100
60
40
50
30
20
10
0
Ripple [mV]
Output Load [%]
24Vout
15, 12Vout
9Vout
6.5Vout
5Vout
3.3Vout
Efficiency vs. Load (max. Vin) Ripple vs. Load (max. Vin)
0 10 20 30 40 50 60 70 80 90
100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
24Vout
15Vout
12Vout
9Vout
6.5Vout
5Vout
3.3Vout
0 10 20 30 40 50 60 70 80 90 100
60
40
50
30
20
10
0
Ripple [mV]
Output Load [%]
24Vout
15, 12Vout
9Vout
6.5Vout
5Vout
3.3Vout
Notes:
Note3: Measurements are made with a 100µF output capacitor
www.recom-power.com REV.: 5/2019 I-4
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78HBxx-0.5(L)
Series
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range with derating (see graph) -40°C to +85°C
Maximum Case Temperature +100°C
Temperature Coefficient ±0.015%/K
Thermal Impedance 0.1m/s, vertical 60K/W
Operating Altitude 2000m
Operating Humidity non-condensing 95% RH max.
Pollution Degree PD2
MTBF according to MIL-HDBK-217F, G.B. +25°C
+71°C
7395 x 103 hours
1242 x 103 hours
-40 -20 0 20 40 70
71 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
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) below 100mWcontinuous, automatic recovery
Short Circuit Input Current nom. Vin= 24VDC 15mA typ. / 25mA max.
To protect the converter during power-up, use C1=3.3µF/100V if Vin>50V
C1
+Vin +Vout
GNDGND
R-78HBxx-0.5
GND
+V
out
+V
in
Protection Circuit
Optional Diode Protection Circuit
Optional Protection 1: Optional Protection 2:
+Vin +Vout
GNDGND
+Vin +Vout=
+Vout - 0.3V
R-78HBxx-0.5
R-78HBxx-0.5
GND
+V
out
+V
in
GNDGND
GND
+V
out
+V
in
+Vin +Vout=
+Vout - 0.3V
R-78HBxx-0.5
GNDGND
GND
+V
out
+V
in
Add a blocking diode to Vout if
current can flow backwards into
the output, as this can damage the
converter when it is powered down.
The diode can either be fitted
across the device if the source is
low impedance or fitted in series
with the output (recommended).
www.recom-power.com REV.: 5/2019 I-5
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78HBxx-0.5(L)
Series
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter Type Value
Material case
potting
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
Package Dimension (LxWxH) 11.5 x 8.5 x 17.5mm
Package Weight 4g typ.
Bottom View
Top View
321 321
8.511.5
17.5
4.10
2.00
0.51
0.70+0.10/-0.05 0.25±0.05
2.54
2.54
Marking
embossed logo
3.21 5.08
embossed logo
Bottom View
Top View
3
21
3
21
2.00
19.0
4.10
6.10
90-93°
Marking
8.5
11.5
0.70+0.10/-0.05
5.08
17.5
1.50
0.25±0.05
0.51
2.54
2.54
Dimension Drawing (mm) with suffix „L” bent pins
Pin Connections
Pin # Single
1 +Vin
2 GND
3 +Vout
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
Recommended Footprint Details Recommended Footprint Details
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 + AM 2:2013
EAC RU-AT.49.09571 TP TC 004/2011
RoHs 2+ RoHS 2011/65/EU + AM2015/863
EMC Compliance Condition Standard / Criterion
Electromagnetic compatibility of multimedia equipment -
Emission requirements with external components EN55032, Class A
EN55032, Class B
ESD Electrostatic discharge immunity test Air ±8kV, Contact ±4kV EN61000-4-2, Criteria A
Radiated, radio-frequency, electromagnetic field immunity test 3V/m EN61000-4-3, Criteria A
www.recom-power.com REV.: 5/2019 I-6
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78HBxx-0.5(L)
Series
INSTALLATION AND APPLICATION
continued on next page
Dual Output (two Converters) with Negative Output
C1 and C2 are required and should
be fitted close to the converter pins.
Maximum capacitiv load including
C2 is 100µF
Part Input Output Output Efficiency External Capacitor
Number Voltage Range Voltage Current @ min Vin @ max. Vin C1 C2 (4)
[VDC] [VDC] [A] [%] [%]
R-78HB3.3-0.5 15 - 65 -3.3 -0.4 78 75 1µF/100V 22µF/6.3V
R-78HB5.0-0.5 15 - 65 -5.0 -0.4 82 80 1µF/100V 22µF/10V
R-78HB6.5-0.5 15 - 65 -6.5 -0.3 84 82 1µF/100V 10µF/10V
R-78HB9.0-0.5 15 - 62 -9.0 -0.2 87 85 1µF/100V 10µF/16V
R-78HB12-0.5 15 - 59 -12 -0.2 88 86 1µF/100V 10µF/25V
R-78HB15-0.5 15 - 56 -15 -0.2 89 87 1µF/100V 10µF/25V
R-78HB24-0.3 15 - 48 -24 -0.2 89 87 1µF/100V 10µF/35V
Selection Guide - Negative Output
Notes:
Note4: Maximum Capacitive Load including C2 is 100µF
Pin Connections
Pin # Negative Positive
1 +Vin +Vin
2 -Vout GND
3 GND +Vout
Positive to Negative Converter
+Vin
-Vout
C2
C1
GNDGND
R-78HBxx-0.5
2
31
+Vin
-Vout
C2
C1
+Vout
GNDGND
R-78HBxx-0.5
2
31
R-78HBxx-0.5
2
31
123
+Vin
-Vout
C2
C1
GNDGND
R-78HBxx-0.5
2
31
+Vin
-Vout
C2
C1
+Vout
GNDGND
R-78HBxx-0.5
2
31
R-78HBxx-0.5
2
31
www.recom-power.com REV.: 5/2019 I-7
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78HBxx-0.5(L)
Series
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.
PACKAGING INFORMATION
Parameter Type Value
Packaging Dimension (LxWxH) tube without suffix
with suffix “L”
520.0 x 25.1 x 10.6mm
520.0 x 26.1 x 15.8mm
Packaging Quantity tube 42pcs
Storage Temperature Range -55°C to +125°C
Storage Humidity 95% RH max.
High Input Voltage Multiple Output Supply
10uF
Cstorage
Brown out
Protection
Revese Polarity
Protection
+Batt
-Batt 0V Com
+5V @ 850mA
+12V @ 100mA
• Wide input range 18V to 72V - can be used with 24V, 48V or 60V batteries
• +12V outputs for interface and display electronics
• +5V high current output for digital electronics
• Further decoupling filtering may be necessary between the converters
R-78HBxx-0.5
GND
+V
out
+V
in
R-785.0-1.0
GND
+V
out
+V
in