DC/DC Converter. R-781.8-1.0 Datasheet

R-781.8-1.0 Converter. Datasheet pdf. Equivalent

R-781.8-1.0 Datasheet
Recommendation R-781.8-1.0 Datasheet
Part R-781.8-1.0
Description DC/DC Converter
Feature R-781.8-1.0; vFeatures ● Efficiency up to 94%, no need for heatsinks! ● Pin-out compatible with LM78XX Linear Re.
Manufacture Recom
Datasheet
Download R-781.8-1.0 Datasheet




Recom R-781.8-1.0
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
Single Output
Selection Guide
Part
Number
Input
Voltage Range
[VDC]
R-781.8-1.0
4.75 - 18
R-782.5-1.0
4.75 - 18
R-783.3-1.0 4.75 - 18
R-785.0-1.0
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
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
IEC/EN60950-1 certified
EN55032 compliant
continued on next page
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REV.: 4/2019
I-1



Recom R-781.8-1.0
R-78xx-1.0
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
Efficiency vs. Vin (full load)
Ripple vs. Vin (full load)
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
50 5Vout
45
3.3Vout
2.5Vout
40 1.8Vout
35
30
25
20
15
10
5
0
5 7 9 11 13 15 17 18
Input Voltage [VDC]
Efficiency vs. Load (max. Vin)
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)
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)
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)
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 [%]
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REV.: 4/2019
I-2



Recom R-781.8-1.0
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
+Vin
R-78xx-1.0
+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
60
40
30
20
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0
-40 0 20 40 60 80 100
85
Ambient Temperature [°C]
REV.: 4/2019
I-3







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