Document
Features
Switching Regulator
• Efficiency up to 94%, no need for heatsinks • Pin compatible with LM78XX linears • Low profile (L/W/H=11.5 x 7.55 x 10.2mm) • Wide input range • Short circuit protection, thermal shutdown • Low ripple and noise • IEC/EN60950-1 certified
DC/DC Converter
R-78-1.0
Description
The R-78xx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators and are pin compatible. Efficiencies of up to 94% mean that very little energy is wasted as heat so there is no need for any heat sinks with their additional space and mounting costs.
1.0 Amp SIP3
3
Single Output
Selection Guide
Part Number
R-781.8-1.0 R-782.5-1.0 R-783.3-1.0 R-785.0-1.0
Input Voltage Range
[VDC] 4.75 - 18 4.75 - 18 4.75 - 18 6.5 - 18
Output Voltage [VDC]
1.8 2.5 3.3 5.0
Output Efficiency
Current
@ min Vin @ max. Vin
[A]
[%] [%]
1.0
82 76
1.0
87 81
1.0
90 84
1.0
94 89
Model Numbering
R-78__-1.0
Output Voltage
Output Current
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
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS Parameter
Quiescent Current Internal Power Dissipation Minimum Load (1) Internal Operating Frequency
Condition Vin = min. to max. at 0% load
Min.
0% 280kHz
Typ. 5mA
350kHz
Max. 7mA 0.4W
430kHz
Output Ripple and Noise
measured at 20MHz BW
20mVp-p 30mVp-p
Absolute Maximum Capacitive Load
1 second start up, no external components <1 second start up + diode protection circuit
220µF 6800µF
Notes:
Note1: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 10mA is recommended
continued on next page
www.recom-power.com
REV.: 5/2023
I-1
R-78xx-1.0
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
Efficiency vs. Vin (full load)
Efficiency [%]
100 90 80 70 60 50 40 30 20 10 0
5
5Vout 3.3Vout 2.5Vout 1.8Vout
7
9
11
13
15
Input Voltage [VDC]
17 18
Ripple vs. Vin (full load)
Ripple [mV]
50
5Vout
45
3.3Vout 2.5Vout
40
1.8Vout
35
30
25
20
15
10
5
0
5
7
9
11
13
15
Input Voltage [VDC]
17 18
Efficiency vs. Load (max. Vin)
Efficiency [%]
100 90 80 70 60 50 40 30 20 10 0
0
5Vout 3.3Vout 2.5Vout 1.8Vout
10 20 30 40 50 60 70 80 90 100 Output Load [%]
Ripple vs. Load (max. Vin)
Ripple [mV]
50
5Vout
45
3.3Vout
2.5Vout
40
1.8Vout
35
30
25
20
15
10
5
0 0 10 20 30 40 50 60 70 80 90 100
Output Load [%]
Efficiency vs. Load (min. Vin)
Efficiency [%]
100 90 80 70 60 50 40 30 20 10 0
0
5Vout 3.3Vout 2.5Vout 1.8Vout
10 20 30 40 50 60 70 80 90 100 Output Load [%]
Ripple vs. Load (min. Vin)
Ripple [mV]
50
5Vout
45
3.3Vout
2.5Vout
40
1.8Vout
35
30
25
20
15
10
5
0 0 10 20 30 40 50 60 70 80 90 100
Output Load [%]
www.recom-power.com
REV.: 5/2023
I-2
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
REGULATIONS Parameter
Output Accuracy Line Regulation Load Regulation Transient Response
Condition 100% load low line to high line, 100% load 10% to 100% load 100% <-> 50% load
R-78xx-1.0
Series
Value ±2.0% typ / ±3.0% max. ±0.2% typ. / ±0.4% max. ±0.4% typ. / ±0.6% max. ±85mV typ. / ±100mV max.
PROTECTIONS Parameter
Short Circuit Protection (SCP) Short Circuit Input Current
Optional Diode Protection Circuit
Condition
nom. Vin= 12VDC +Vin
Value
continuous, automatic recovery
R-78xx-1.0
+Vin
+Vout
GND
100mA max. +Vout
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).
Optional Protection 1:
+Vin GND
R-78xx-1.0
+Vin
+Vout
GND
Optional Protection 2:
GND
+Vout
+Vin
R-78xx-1.0
+Vin
+Vout
GND
GND
GND
GND
+Vout= +Vout - 0.3V
GND
ENVIRONMENTAL Parameter
Operating Temperature Range Maximum Case Temperature Temperature Coefficient Thermal Impedance Operating Altitude Operating Humidity Pollution Degree
MTBF
R-78xx-1.0
+Vin
+Vin
+Vout
+Vout=
GND
+Vout - 0.3V
Condition
GND
with derating (see grapGhN) D
0.1m/s, vertical non-condesing according to MIL-HDBK-217F, G.B.
+25°C +71°C
Value -40°C to +85°C
+100°C ±0.015%/K
70K/W 2000m 95% RH max.
PD2 13338 x 103 hours 3880 x 103 hours
Derating Graph
100
80
Output Power [%]
60
40 30 20
0
-40
0
20
40
60
80 100
85
Ambient Temperature [°C]
www.recom-power.com
REV.: 5/2023
I-3
R-78xx-1.0
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
SAFETY AND CERTIFICATIONS Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC RoHs 2+
Repor.