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OKI-78SR Datasheet PDF - Murata Manufacturing

Part Number OKI-78SR
Description Fixed Output 1.5 Amp SIP DC/DC Converters
Manufacturers Murata Manufacturing 
Logo Murata Manufacturing Logo 



Preview ( 10 pages )
		
OKI-78SR datasheet, circuit
www.murata-ps.com
OKI-78SR Serieswww.DataSheet4U.com
Fixed Output 1.5 Amp SIP DC/DC Converters
Typical unit
FEATURES
Ultra wide 7 to 36 VDC input range
Fixed Outputs of 3.3 or 5 VDC up to 1.5 Amps
Vertical SIP-mount, small footprint package
“No heat sink” direct replacement for 3-terminal
78xx-series linear regulators
High efficiency with no external components
Short circuit protection
Outstanding thermal derating performance
UL/EN/IEC 60950-1, 2nd Edition safety approvals
(pending)
PRODUCT OVERVIEW
Fabricated on a 0.41 by 0.65 inch (10.4 by 16.5
mm) Single Inline Package (SIP) module, the OKI-
78SR series are non-isolated switching regulator
(SR) DC/DC power converters for embedded ap-
plications. The fixed single output converters offer
both tight regulation and high efficiency directly
at the power usage site and are a direct plug-in
replacement for TO-220 package 78xx series linear
regulators. Typically, no extra outside components
are required.
Two nominal output voltages are offered (3.3
and 5 VDC), each with 1.5 Amp maximum output.
Based on fixed-frequency buck switching topology,
the high efficiency means very low heat and little
electrical noise, requiring no external components.
The ultra wide input range is 7 to 36 Volts DC.
Protection features include input undervoltage
and short circuit protection, overcurrent and over
temperature shut down. The OKI-78SR is designed
to meet all standards approvals. RoHS-6 (no lead)
hazardous material compliance is specified as
standard.
Contents
Description, Connection Diagram, Photograph
Ordering Guide, Model Numbering, Product Labeling
Mechanical Specifications, Input/Output Pinout
Detailed Electrical Specifications
Performance Data and Oscillograms
Soldering Guidelines, Application Notes
Page
1
2
3
4
5
9
+Vin
F1
External
DC
Power
Source
Connection Diagram
Controller
t4XJUDIJOH
t'JMUFST
t$VSSFOU4FOTF
Reference and
Error Amplifier
+Vout
Common
Figure 1. OKI-78SR
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
Common
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
email: sales@murata-ps.com
21 May 2010 MDC_OKI-78SR-W36.A01 Page 1 of 10

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OKI-78SR equivalent
OKI-78SR Serieswww.DataSheet4U.com
Fixed Output 1.5 Amp SIP DC/DC Converters
PERFORMANCE DATA – OKI-78SR3.3/1.5-W36
Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.)
100
90
80
70
60
50
40
30
20
10
0
0
VIN = 7V
VIN = 12V
VIN = 36V
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6
Load Curre nt (Amps)
Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.6A, Cload=0, Ta=+25˚C.,
ScopeBW=100MHz)
Maximum Current Temperature Derating at sea level (Vin=7V. to 36V.)
2.00
65 LFM
1.00
0.00
20 25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.6A, Cload=0, Ta=+25˚C.,
ScopeBW=100MHz)
Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.6A, Cload=0, Ta=+25˚C.,
ScopeBW=100MHz)
www.murata-ps.com
email: sales@murata-ps.com
21 May 2010 MDC_OKI-78SR-W36.A01 Page 5 of 10

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