Datasheet

ManualsBrandsRECOM ManualsPSU ComponentsDC/DC Converter

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REV.: 3/2019 I-1

Features

Switching

Regulator

• Efﬁciency up to 96%, no need for heatsinks

• Pin-out compatible with LM78XX linears

• Low proﬁle (L*W*H=11.6*8.5*10.4mm)

• Wide input range (5V - 42V)

• Short circuit protection, thermal shutdown

• Low ripple and noise

• IEC/EN60950 certiﬁed

R-78C-1.0

Description

The R-78Cxx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators

and are pin compatible. Efﬁciencies of up to 96% means that very little energy is wasted as heat and

the high input voltage is a useful feature.

DC/DC Converter

1.0 Amp

SIP3

Single Output

IEC60950-1 certiﬁed

EN60950-1 certiﬁed

EN55032 compliant

Speciﬁcations (measured at Ta= 25°C, minimum load, otherwise speciﬁed)

BASIC CHARACTERISTICS

Parameter Condition Min. Typ. Max.

Input Voltage Range Vout +3V 42VDC

Output Voltage Range 1.8VDC 15VDC

Minimum Load

(1)

Quiescent Current 1mA

Internal Operating Frequency 280kHz 350kHz 420kHz

Output Ripple and Noise

(2)

20MHz BW

Vin= 24VDC Vout=1.8-15

full load

75mVp-p

30mVp-p

120mVp-p

Max. Capacitive Load

with normal start-up time, no external components

with <1 second start-up time + diode protection circuit

470µF

6800µF

Selection Guide

Part Input Output Output Efﬁciency

Number Voltage Range Voltage Current @ min Vin @ max. Vin

[VDC] [VDC] [A] [%] [%]

R-78C1.8-1.0 5 - 42 1.8 1.0 80 71

R-78C3.3-1.0 7 - 42 3.3 1.0 89 79

R-78C5.0-1.0 8 - 42 5 1.0 93 85

R-78C9.0-1.0 12 - 42 9 1.0 95 90

R-78C12-1.0 15 - 42 12 1.0 96 92

R-78C15-1.0 18 - 42 15 1.0 96 94

Notes:

Note1: No load operation will not damage these devices, however they may not meet all speciﬁcations

A minimum load of 10mA is required

Note2: Measurements are made with a 10µF MLCC across output. (low ESR)

REGULATIONS

Parameter Condition Value

Output Voltage Accuracy

full load ±2% typ. / ±3% max.

Line Voltage Regulation max. Vin, full load ±0.2% typ.

Load Voltage Regulation max. Vin. and 10% to 100% load ±0.4% typ.

Transient Response

100% <-> 50% load

100% <-> 10% load

±75mV max.

±200mV max.

Model Numbering

Output Voltage Output Current

R-78C__-1.0

Summary of content (5 pages)

PAGE 1
• • • • • • • Features Switching Regulator Efficiency up to 96%, no need for heatsinks Pin-out compatible with LM78XX linears Low profile (L*W*H=11.6*8.5*10.4mm) Wide input range (5V - 42V) Short circuit protection, thermal shutdown Low ripple and noise IEC/EN60950 certified DC/DC Converter R-78C-1.0 Description The R-78Cxx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators and are pin compatible.
PAGE 2
R-78C-1.0 DC/DC Converter Series Specifications (measured at Ta= 25°C, minimum load, otherwise specified) PROTECTIONS Parameter Condition Value Short Circuit Protection (SCP) continuous, automatic recovery Short Circuit Input Current nom. Vin = 24VDC 65mA typ. External Zener Diode Calculation for Output Over Voltage Protection Minimum Zener Breakdown Voltage (VZmin) ≥ VOUTnom + 3% Accuracy +VIN R-78Cxx-1.0 R-78C Vout 1.8V (1.85V max.) 3.3V (3.4V max.) 5V (5.15V max.) 9V (9.27V max.) 12V (12.
PAGE 3
R-78C-1.0 DC/DC Converter Series Specifications (measured at Ta= 25°C, minimum load, otherwise specified) EMC Compliance Electromagnetic compatibility of multimedia equipment Emission requirements Condition Standard / Criterion with external filter (see filter suggestion below) EN55032, Class A and B EMC Filter Suggestion according to EN55032 L1 R-78C-1.0 +Vin +Vin C2 C1 +Vout +Vout GND GND GND Component List Class A MODEL R-78C3.3-1.0 R-78C5.0-1.
PAGE 4
R-78C-1.0 DC/DC Converter Series Specifications (measured at Ta= 25°C, minimum load, otherwise specified) INSTALLATION AND APPLICATION Positive to Negative Converter 1 +VIN R-78Cxx-1.0 3 2 C1 10µF/50V Pin Connections Pin # Negative 1 +Vin 2 -Vout 3 GND C2 10µF/50V GND GND Positive +Vin GND +Vout -VOUT Selection Guide - Negative Output Part Number Input Voltage Range (3) [VDC] 5 - 38 7 - 37 8 - 35 12 - 31 15 - 28 18 - 25 R-78C1.8-1.0 R-78C3.3-1.0 R-78C5.0-1.0 R-78C9.0-1.0 R-78C12-1.
PAGE 5
R-78C-1.0 DC/DC Converter Series Specifications (measured at Ta= 25°C, minimum load, otherwise specified) High Efficiency Regulated Outputs +5VDC REC3-0515DRW/H2/A +12VDC R-78Cxx-1.0 +VIN C1 Com C2 -12VDC -VIN C1: optional; C2: Required (further decoupling filtering may be neccesary between the two conversters) -Triple Outputs - Wide Input Range 8V to 42V - High System Efficiency, Suitable for 12V, 24V, 36V Battery Powered Devices Standard Application Circuit R-78Cxx-1.