Document
Features
Switching Regulator
• Efficiency up to 95%, no heatsinks required • Pin compatible with LM78XX linears • Low profile (L/W/H=11.5 x 8.5 x 17.5mm) • Wide input range • Short circuit protection, thermal shutdown • Low ripple and noise • „L“ version with 90° pins
DC/DC Converter
R-78B-1.5(L)
RE CTS
RE CTS
y
w
ERS CO
ERS CO
Description
The R-78Bxx-1.5 series high efficiency switching regulators are ideally suited to replace 78xx linear regulators and are pin compatible. The efficiency of up to 95% means that very little energy is wasted as heat so there is no need for any heat sinks with their additional space and mounting costs. The L-Version with 90° pins allows direct replacement for laid-flat regulators where component height is at a premium. Low ripple and noise figures and a short circuit input current of typically only 10mA round off the specifications of this versatile converter series.
1.5 Amp SIP3
YEAR
3
arrant
Single Output
Selection Guide
Part Number
R-78B3.3-1.5 (1) R-78B5.0-1.5 (1) R-78B6.5-1.5 (1)
Input Voltage Range
[VDC]
4.75 - 18
6.5 - 18
8.0 - 18
Output Voltage [VDC]
3.3
5.0
6.5
Output Efficiency
Current
@ min Vin @ max. Vin
[A]
[%] [%]
1.5
91 88
1.5
94 92
1.5
95 93
Selection Guide (NRND, last time buy: 16th Nov 2020)
Part Number
R-78B1.5-1.5 (1) R-78B1.8-1.5 (1) R-78B2.5-1.5 (1)
Input Voltage Range
[VDC]
4.75 - 18
4.75 - 18
4.75 - 18
Output Voltage [VDC]
1.5
1.8
2.5
Output Efficiency
Current
@ min Vin @ max. Vin
[A]
[%] [%]
1.5
83 78
1.5
85 81
1.5
88 84
Model Numbering
R-78B__-1.5(L)
Output Voltage
Pinning
Output Current
Notes: Note1: add suffix “L” for 90° bent pins, e.g. R-78B5.0-1.5L
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS
Parameter
Condition
Min. Typ. Max.
Quiescent Current
nom. Vin= 12VDC
7mA 9mA
Internal Power Dissipation
Vout= 1.5VDC
0.65W
Internal Operating Frequency
nom. Vin= 12VDC
300kHz 340kHz 380kHz
Minimum Load (2)
0%
Output Ripple and Noise (3)
20MHz BW
15mVp-p 30mVp-p
Ref. Back Ripple Current
150mAp-p 200mAp-p
Absolute Maximum Capacitive Load
1 second start up, no external components <1 second start up + diode protection circuit
1000µF 6800µF
Notes: Note2: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 10mA is recommended Note3: Output Ripple and Noise is tested from 10% to 100% load continued on next page
COM CONVERT
RoHS 2+
compliant 10 from 10
M PLIANT PRODU
COM CONVERT
REACH
compliant
M PLIANT PRODU
EN55032 compliant IEC/EN60950-1 certified
PREFERRED ALTERNATIVES
Please consider these alternatives:
R-78B-2.0 Series
www.recom-power.com
REV.: 5/2020
I-1
R-78Bxx-1.5(L)
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
Efficiency vs. Vin (full load)
100
90
80
70
Efficiency [%]
60
50
40
30
20
10
0 4.75 7
9
11
13
Input Voltage [.