Recom R-78AA3.3-1.0SMD Handleiding
Recom
Audio/video-converter
R-78AA3.3-1.0SMD
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www.recom-power.com REV.: 5/2019 I-1
Features
Switching
Regulator
R-78AA-1.0
Description
The R-78AAxx-1.0SMD series are adjustable output non-isolated buck converters that meet the
requirements for RoHS 10/10 as well as the reflow soldering temperatures associated with va-
por phase soldering, making these high efficiency switching regulators ideally suited to modern
pick-and-place mass production. The efficiency of up to 97% means that very little energy
is wasted as heat. The additional features of remote on/off control, continuous short circuit protection
and adjustable output voltages will find many uses in the battery-powered, industrial, medical and
automotive markets.
DC/DC Converter
1.0 Amp
SMD
Single Output
EN60950-1 certified
IEC60950-1 certified
• Efficiency up to 94%, no need for heatsinks
• High reflow temperature SMD package
• Adjustable output voltage buck converter
• Short circuit protection, thermal shutdown
• Remote on/off control
• Very low shutdown current
Selection Guide
Part Input Output Vout Output Efficiency
Number Voltage Range Voltage Adjust Range Current @ min Vin @ max. Vin
[VDC] [VDC] [VDC] [A] [%] [%]
R-78AA1.5-1.0SMD 4.75 - 18 1.5 fixed 1.0 77 73
R-78AA1.8-1.0SMD 4.75 - 18 1.8 1.5 - 3.0 1.0 82 76
R-78AA2.5-1.0SMD 4.75 - 18 2.5 1.5 - 3.0 1.0 87 81
R-78AA3.3-1.0SMD 4.75 - 18 3.3 3.0 - 5.5 1.0 90 84
R-78AA5.0-1.0SMD 6.5 - 18 5.0 3.0 - 5.5 1.0 94 89
Model Numbering
Notes:
Note2: add suffix -R for tape & reel packaging
Ordering Examples:
R-78AA5.0-1.0SMD-R = 5.0VDC Output Volage, 1.0A, SMD, tape and reel packaging
R-78AA2.5-1.0SMD = 2.5VDC Output Volage, 1.0A, SMD, tube
nom. Output Voltage
Output Current
Packaging (2)
Package
R-78AA__-1.0SMD-_
Notes:
Note1: Input voltage ranges valid for nominal output voltages
Vin must be higher than Vout including adjust range and dropout voltage
www.recom-power.com REV.: 5/2019 I-2
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78AA-1.0
Series
BASIC CHARACTERISTICS
Parameter Condition Min. Max.Typ.
Quiescent Current Vin= min. to max. 5mA 7mA
Internal Power Dissipation 0.4W
Output Voltage Adjustability see calculation
Minimum Load (2) 0%
Start-up time ON/OFF CTRL 50ms
ON/OFF CTRL DC-DC ON
DC-DC OFF
Open or 2.8VDC<Vr<5VDC
GND or 0VDC<Vr<0.8VDC
Input Current of CTRL Pin DC-DC OFF 1.8µA
Standby Current 20µA 35µA
CTRL Thereshold Voltage 2.4VDC 2.6VDC 2.8VDC
CTRL Voltage Hysterese 250mV
Internal Operating Frequency 335kHz 385kHz 435kHz
Output Ripple and Noise 20MHz BW 20mVp-p 30mVp-p
Maximum Capacitive Load with normal start-up time, no external components 470µF
with <1 second start-up time + diode protection circuit 6800µF
continued on next page
Notes:
Note3: Operation under no load will not harm the converter, but specifications may not be met.
A minimum load of 10mA is recommended
4.75 7 9 11 13 15 17 18
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Input Voltage [VDC]
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
4.75 7 9 11 13 15 17 18
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Input Voltage [VDC]
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
Efficiency vs. Vin (full load) Ripple vs. Vin (full load)
+V IN +VOUT
R1
R2 R3
Rdown
Rup
GND
Vref
GND
Vadj
Controlled IC
Adjustment Resistor Values
R1 R2 R3 Vref(V)
1.8V 10KΩ Ω Ω 1.2321K 5.6K
2.5V 22KΩ Ω Ω 1.2321K 5.6K
3.3V 16.9KΩ Ω Ω 1.2310K 5.6K
5.0V 30.9KΩ Ω Ω 1.2310K 10K
Trim down Rdown = R2(R1 + R3) x (Vref - Vo) + Vref x R1R3
R2Vo - Vref (R1 + R2)
Trim up Rup = R2R3 (Vref - Vo) + Vref R1 (R2 + R3)
R2 (Vo - Vref) - Vref R1
Output Voltage Adjustability
www.recom-power.com REV.: 5/2019 I-3
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78AA-1.0
Series
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 [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
100 20 30 40 50 60 70 80 90
100
40
30
20
50
45
35
25
15
10
5
0
Ripple [mV]
Output Load [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
100 20 30 40 50 60 70 80 90
100
40
30
20
50
45
35
25
15
10
5
0
Ripple [mV]
Output Load [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
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 [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
REGULATIONS
Parameter Condition Value
Output Accuracy full load ±2.0% typ. / ±3.0% max.
Line Regulation low line to high line, full load ±0.2% typ. / ±0.4% max.
Load Regulation 10% to 100% load ±0.7% typ. / ±1.0% max.
Transient Response 25mA/µs 100% <-> 50% load ±85mV typ. / ±100mV max.
Efficiency vs. Load (max. Vin)
Efficiency vs. Load (min. Vin)
Ripple vs. Load (max. Vin)
Ripple vs. Load (min. Vin)
Product specificaties
| Merk: | Recom |
| Categorie: | Audio/video-converter |
| Model: | R-78AA3.3-1.0SMD |
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