Recom R-78AA3.3-1.0SMD Manual

Recom Audio/video konverter R-78AA3.3-1.0SMD

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Side 1/6

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)

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

Efficiency [%]

Input Voltage [VDC]

5Vout

3.3Vout

2.5Vout

1.8Vout

1.5Vout

4.75 7 9 11 13 15 17 18

Ripple [mV]

Input Voltage [VDC]

5Vout

3.3Vout

2.5Vout

1.8Vout

1.5Vout

Efﬁciency vs. Vin (full load)

Ripple vs. Vin (full load)

OUT

down

GND

Vref

GND

adj

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

Produkt Specifikationer

Mærke:	Recom
Kategori:	Audio/video konverter
Model:	R-78AA3.3-1.0SMD

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