Features
Switching
Regulator
Description
•
•
•
•
•
•
•
Efficiency up to 95%, no heatsinks required
Pin-out compatible with LM78XX linears
Low profile (L/W/H=11.5 x 8.5 x 17.5mm)
Wide input range
Short circuit protection, thermal shutdown
Low ripple and noise
„L“ version with 90° pins
DC/DC Converter
R-78B-1.5(L)
The R-78Bxx-1.5 series high efficiency switching regulators are ideally suited to replace 78xx
linear regulators and are pin compatible. The efficiency of up to 95% 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.
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 10mA round
off the specifications of this versatile converter series.
1.5 Amp
SIP3
Single Output
Selection Guide
Part
Number
R-78B1.5-1.5
(1)
R-78B1.8-1.5
(1)
R-78B2.5-1.5
(1)
R-78B3.3-1.5
(1)
R-78B5.0-1.5
(1)
R-78B6.5-1.5
(1)
Input
Voltage Range
[VDC]
4.75 - 18
4.75 - 18
4.75 - 18
4.75 - 18
6.5 - 18
8.0 - 18
Output
Voltage
[VDC]
1.5
1.8
2.5
3.3
5.0
6.5
Output
Current
[A]
1.5
1.5
1.5
1.5
1.5
1.5
Efficiency
@ min Vin
@ max. Vin
[%]
[%]
83
78
85
81
88
84
91
88
94
92
95
93
Model Numbering
R-78B__-1.5/L
Output Voltage
Pinning
Output Current
Notes:
Note1: add suffix “/L” for 90° bent pins, e.g. R-78B5.0-1.5L
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS
Parameter
Input Voltage Range
Quiescent Current
Internal Power Dissipation
Internal Operating Frequency
Minimum Load
(2)
EN55032 compliant
IEC/EN60950-1 certified
Condition
nom. Vin= 12VDC
nom. Vin= 12VDC
Vout= 1.5VDC
nom. Vin= 12VDC
10% to 100% full load
20MHz BW
Min.
4.75VDC
Typ.
7mA
Max.
18VDC
9mA
0.65W
380kHz
300kHz
0%
340kHz
Output Ripple and Noise
(3)
Ref. Back Ripple Current
Absolute Maximum
Capacitive Load
15mVp-p 30mVp-p
150mAp-p 200mAp-p
1000µF
6800µF
1 second start up, no external components
<1 second start up + diode protection circuit
Notes:
Note2: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 10mA is recommended
Note3: Output Ripple and Noise is tested from 10% to 100% load
continued on next page
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REV.: 2/2018
I-1
R-78Bxx-1.5(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Vin (full load)
100
90
80
Series
Ripple vs. Vin (full load)
50
45
40
35
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
Efficiency [%]
70
Ripple [mV]
60
50
40
30
20
10
0
4.75
7
9
11
13
15
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
17 18
30
25
20
15
10
5
0
4.75
7
9
11
13
15
17 18
Input Voltage [VDC]
Input Voltage [VDC]
Efficiency vs. Load (max. Vin)
100
90
80
Ripple vs. Load (max. Vin)
50
45
40
35
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
80
90
100
Ripple [mV]
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
Output Load [%]
Efficiency vs. Load (min. Vin)
100
90
80
Ripple vs. Load (min. Vin)
50
45
40
35
6.5Vout
5Vout
3.3, 2.5Vout
1.8, 1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
6.5Vout
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
90
100
Ripple [mV]
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
Output Load [%]
www.recom-power.com
REV.: 2/2018
I-2
R-78Bxx-1.5(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
Transient Response
Series
Condition
100% load
low line to high line, full load
10% to 100% load
100% <-> 50% load
Recovery Time
Value
±2.0% typ / ±3.0% max.
±0.3% typ. / ±0.5% max.
±0.6% typ. / ±0.8% max.
±80mV typ. / ±120mV max.
1.0ms min. / 1.5ms typ.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
Condition
below 100mW
nom. Vin= 12VDC
+V
IN
Value
continuous, automatic recovery
100mA max.
Optional Diode Protection Circuit
Optional Protection 1:
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).
R-78Bxx-1.5
+V
OUT
Optional Protection 2:
GND
GND
+V
out
=
+V
out
- 0.3V
+V
IN
R-78Bxx-1.5
+V
OUT
+V
IN
R-78Bxx-1.5
GND
GND
+V
out
=
+V
out
- 0.3V
GND
GND
+V
IN
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
GND
R-78Bxx-1.5
Condition
Value
-40°C to +85°C
+100°C
±0.015%/°C
with derating (see graph)
GND
0.1m/s, vertical
non-condensing
according to MIL-HDBK-217F, G.B.
100
90
80
60°C/W
2000m
95% RH max.
PD2
+25°C
5019 x 10
3
hours
Derating Graph
Output Load [%]
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0 10 20 30 40 50 60 70 80 90 100
71 85
Ambient Temperature [°C]
www.recom-power.com
REV.: 2/2018
I-3
R-78Bxx-1.5(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC
RoHs 2+
Series
Report / File Number
1603123
RU-AT.49.09571
Standard
IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM 2:2013
TP TC 004/2011
RoHS 2011/65/EU + AM2015/863
EMC Compliance
Electromagnetic compatibility of multimedia equipment -
Emission requirements
ESD Electrostatic Discharge Immunity Test
Radiated, Radio-Frequency, Electromagnetic Field Immunity Test
Condition
with external components
Air ±8kV, Contact ±4kV
3V/m
Standard / Criterion
EN55032, Class A
EN55032, Class B
EN61000-4-2, Criteria A
EN61000-4-3, Criteria A
EMC Filter Suggestion according EN55032 Class A and Class B
L1
+V
IN
C1
C2
R-78Bxx-1.5
+V
OUT
-V
IN
Level
Class A
Class B
-V
OUT
C1
10µF 100V MLCC
10µF 100V MLCC
C2
-
4.7µF 50V MLCC
L1
3.9µH choke
5.6µH choke
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
continued on next page
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REV.: 2/2018
I-4
Type
case
potting
Value
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
11.5 x 8.5 x 17.5mm
4g typ.
R-78Bxx-1.5(L)
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Dimension Drawing (mm)
with suffix “/L” bent pins
Series
embossed logo
embossed logo
11.5
8.5
11.5
8.5
Pin Connections
Pin #
Single
1
+Vin
2
GND
3
+Vout
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
0.25
±0.05
17.5
19.0
0.51
17.5
Marking
Marking
90
0.51
-9
3°
1.50
0.70
+0.10/-0.05
6.10
4.10
0.70
+0.10/-0.05
0.25
±0.05
Recommended Footprint Details
Bottom View
2.54
1 2 3
2.00
2.54
Recommended Footprint Details
Bottom View
5.08
3.21
5.08
2.00
2.54
4.10
1 2 3
1 2 3
Top View
Top View
1 2 3
2.54
INSTALLATION AND APPLICATION
Typical Application Circuit
+V
IN
+V
IN
GND
GND
+V
OUT
+V
OUT
GND
GND
R-78Bxx-1.5
R-78Bxx-1.5
Application Examples
High Efficiency Multiple Output
+V
IN
+V
IN
R-78Bxx-1.5
R-78Bxx-1.5
22µF
22µF
P05P215D/P
P05P215D/P
+5V @ 1A
+15V
+5V @ 1A @ 66mA
+15V @ 66mA
0V Isolated Com
0V Isolated Com
-15V @ 66mA
-15V +5V Rtn
@ 66mA
GND
GND
- Wide input range suits both 12V and 7.2V battery packs
+5V Rtn
- 5.2kV isolated short circuit protected outputs for analogue circuits, e.g. medical grade interface
- input range suits both protected output for packs
- Wide High efficiency +5V/1A12V and 7.2V battery digital circuits
- isolated short circuit protected be necessary between the converters
- 5.2kVFurther decoupling filtering may outputs for analogue circuits, e.g. medical grade interface
- High efficiency +5V/1A protected output for digital circuits
- Further decoupling filtering may be necessary between the converters
continued on next page
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+V
IN
+V
+12V @ 0.1A
RP10-4812SEW
RP10-4812SEW
REV.: 2/2018
+12V @ 0.1A
I-5
R-78B5.0-1.5
+5V @ 1.5A
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