Document
Features
Switching Regulator
• Efficiency up to 97%, no need for heatsinks • Pin-out compatible with LM78XX linears • Very low profile • 4.75V - 32V Wide input range • Short circuit protection, thermal shutdown • Low ripple and noise • IEC/EN60950-1 certified • Positive to negative converter
DC/DC Converter
R-78-0.5
Description
The R-78xx-Series high efficiency switching regulators are ideally suited to replace 78xx linear regultors and are pin compatible. The efficiency of up to 97% 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. Low ripple and noise figures and short circuit, overload and over-temperature protection round off the specifications of this versatile converter series. This R-78xx-0.5 is fully certified to EN55032 EMC Standard and for IEC/EN-60950-1 + AM2 Safety.
0.5 Amp SIP3
3
Single Output
Selection Guide
Part Number
R-781.5-0.5 R-781.8-0.5 R-782.5-0.5 R-783.3-0.5 R-785.0-0.5 R-786.5-0.5 R-789.0-0.5 R-7812-0.5 R-7815-0.5
Input Voltage Range
[VDC] 4.75 - 30 (1) 4.75 - 32 4.75 - 32 4.75 (2) - 32
6.5 - 32 8.0 - 32 11 - 32 15 - 32 18 - 32
Output Voltage [VDC]
1.5 1.8 2.5 3.3 5.0 6.5 9.0 12 15
Output Efficiency
Current
@ min Vin @ max. Vin
[A]
[%] [%]
0.5
73 63
0.5
82 71
0.5
87 77
0.5
91 81
0.5
94 86
0.5
95 88
0.5
96 92
0.5
97 94
0.5
97 95
Notes: Note1: 1.5V Output can be unstable with Vin>30VDC Note2: Refer to Transient Response on page I-3
RE CTS
RE CTS
ERS CO
ERS CO
COM CONVERT
RoHS 2+
compliant 10 from 10
M PLIANT PRODU
COM CONVERT
REACH
compliant
M PLIANT PRODU
IEC/EN60950-1 certified EN55032 compliant
Model Numbering
R-78__-0.5
Output Voltage
Output Current
www.recom-power.com
REV.: 6/2023
I-1
R-78xx-0.5
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
BASIC CHARACTERISTICS Parameter
Absolute Maximum Input Voltage Quiescent Current Internal Power Dissipation Minimum Load (3) Internal Operating Frequency
Output Ripple and Noise
Absolute Maximum Capacitive Load
Condition nom. Vin= 24VDC
20MHz BW, without output capacitor
1.5 - 6.5VDC 9 - 15.5VDC
20MHz BW (4)
1.5VDC 1.8 - 15.5VDC
1 second start up, no external components
<1 second start up + diode protection circuit
Min.
0% 280kHz
Typ.
5mA
330kHz 20mVp-p 30mVp-p 15mVp-p 25mVp-p
Notes:
Note3: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 6mA is recommended
Note4: Measurements are made with a 100nF MLCC across output (low ESR)
Max. 34VDC 7mA 0.4W
380kHz 30mVp-p 40mVp-p 20mVp-p 35mVp-p
220µF 6800µF
Efficiency vs. Vin (full load)
100
90
80
70
Efficiency [%]
60
50
40
15, 12Vout
30
9Vout
5Vout
20
3.3Vout
10
1.8Vout
1.5Vout
0
0
5
10
15
20
25
Input Voltage [VDC]
30 34
Ripple vs. Vin (full load)
50
15Vout
45
12Vout
9Vout
40
5Vout
35
3.3Vout
1.8Vout
30
1.5Vout
Ripple [mV]
25
20
15
10
5
0
0
5
10
15
20
25
Input Voltage [VDC]
30 34
Efficiency vs. Load (max. Vin)
Ripple vs. Load (nom. Vin)
Efficiency [%]
100
50
15Vout
90
45
12Vout 9Vout
80
40
5Vout
3.3Vout
70
35
1.8Vout
60
30
1.5Vout
Ripple [mV]
50
25
40
15Vout
30
12Vout
5Vout
20
3.3Vout
10
1.8Vout
1.5Vout
0 0 10 20 30 40 50 60 70 80 90 100
20 15 10 5 0
0 10 20 30 40 50 60 70 80 90 100
Output Load [%]
continued on next page
Output Load [%]
www.recom-power.com
REV.: 6/2023
I-2
R-78xx-0.5
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
Efficiency [%] Ripple [mV]
Efficiency vs. Load (min. Vin)
100 90 80 70 60 50 40 30 20 10 0
0
15, 12Vout 5Vout 3.3Vout 1.8Vout 1.5Vout
10 20 30 40 50 60 70
Output Load [%]
80 90 100
Ripple vs. Load (min. Vin)
50
15Vout
45
12Vout
9, 3.3Vout
40
5Vout
35
1.8Vout 1.5Vout
30
25
20
15
10
5
0 0 10 20 30 40 50 60 70 80 90 100
Output Load [%]
REGULATIONS Parameter
Output Accuracy Line Regulation
Load Regulation
Transient Response (5)
Condition
100% load
low line to high line, 100% load
1.5V - 6.5V 9V - 15.5V
10% to 100% load
1.5V - 6.5V 9V - 15.5V
100% <-> 50% load 100% <-> 10% load
Notes: Note5: The R.783.3-0.5 requires Vin>5.5V to meet the Transient Response specifications
Value ±2.0% typ / ±3.0% 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.
PROTECTIONS Parameter
Short Circuit Protection (SCP) Short Circuit Input Current
Optional Diode Protection Circuit
Condition nom. Vin= 24VDC Optional Protection 1:
Value
continuous, automatic recovery
+Vin
R-78xx-0.5
+Vin
+Vout
+6V0oumt A max.
GND
Optional Protection 2:
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. +Vin
The diode can either be fitted across the device if the sour.