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OKI-78SR 데이터시트 PDF




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부품번호 OKI-78SR 기능
기능 Fixed Output 1.5 Amp SIP DC/DC Converters
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OKI-78SR 데이터시트, 핀배열, 회로
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
21 May 2010 MDC_OKI-78SR-W36.A01 Page 1 of 10




OKI-78SR pdf, 반도체, 판매, 대치품
Performance and Functional Specifications
All specifications are typical unless noted. See Note 1
Input
Input Voltage Range
Recommended External Fuse
Reverse Polarity Protection (Note 9)
Isolation (note 5)
Start-Up Voltage
Undervoltage Shutdown (Note 13)
Overvoltage Shutdown
Internal Input Filter Type
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
No Load
Low Line (Vin=Vmin, Vout=nom)
Reflected (Back) Ripple Current
(Note 2)
See Ordering Guide.
2 Amps fast blow
None. Install an external fuse.
Not isolated. The input and output share a
common return.
4.85V. min., 6.0V. max (OKI-78SR3.3/1.5-W36)
6.5V. min., 7.5V. max. (OKI-78SR5/1.5-W36)
4.15V.min., 4.5V. max. (OKI-78SR3.3/1.5-W36)
3.5V. min., 5.0V. max. (OKI-78SR5/1.5-W36)
None
Capacitive
See Ordering Guide
0.16 A2Sec.
1 mA
5 mA
5 mA
0.8 Amps (OKI-78SR3.3/1.5-W36)
1.16 Amps (OKI-78SR5/1.5-W36)
10 mA pk-pk (OKI-78SR3.3/1.5-W36)
49 mA pk-pk (OKI-78SR5/1.5-W36)
Output
Output Voltage
See Ordering Guide
Output Current Range
0 to 1.5 Amps
Minimum Loading (Note 12)
No minimum load
Maximum Output Power
5.15 Watts (OKI-78SR3.3/1.5-W36)
7.8 Watts (OKI-78SR5/1.5-W36)
Accuracy (50% load)
±4 % of Vnom
Overvoltage Protection (Note 7) None
Temperature Coefficient
±0.02% per °C. of Vout range
Ripple/Noise (20 MHz bandwidth) See Ordering Guide and note 12
Line/Load Regulation
See Ordering Guide and note 10
Efficiency
See Ordering Guide and performance graphs
Maximum Capacitive Loading
Cap-ESR=0.001 to 0.01 Ohms 300 μF
Cap-ESR >0.01 Ohms
3300 μF
Current Limit Inception (98% of Vout
setting, after warm up)
3.5 Amps
Short Circuit Mode (Notes 6, 12)
Short Circuit Current Output
10 mA
Protection Method
Hiccup autorecovery upon overload removal.
(Note 8)
Short Circuit Duration
Continuous, no damage (output shorted to
ground)
Prebias Startup
The converter will start up if the external output
voltage is less than Vnominal.
Dynamic Characteristics
Dynamic Load Response (50% to 100% load step, no external caps)
di/dt = 1 A/μSec
25 μSec settling time to within ±2% of final value
Peak deviation
100 mV
Switching Frequency
500 KHz
Environmental
Calculated MTBF (Note 4)
TBC
Operating Ambient Temperature Range
Full power, with derating [3]
-40 to +85 °C. see derating curves.
Storage Temperature Range
-55 to +125 °C.
Relative Humidity
to 85%/+85 °C.
OKI-78SR Serieswww.DataSheet4U.com
Fixed Output 1.5 Amp SIP DC/DC Converters
Physical
Outline Dimensions
Weight
Safety
See Mechanical Specifications [11]
0.07 ounces (2 grams)
UL/cUL 60950-1
CSA-C22.2 No. 60950-1
IEC/EN 60950-1, 2nd Edition
Absolute Maximum Ratings
Input Voltage, Continuous or transient 36 Volts max.
Input Reverse Polarity Protection None. Install external fuse.
Output Current
Current-limited. Devices can withstand sustained
short circuit without damage.
Storage Temperature
-40 to +125 deg. C.
Specification Notes:
(1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient
temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended
testing under power. See Derating curves.
All models are tested and specified with no external capacitors. All models are stable and regulate within
spec under no-load conditions.
(2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x
100 μF, Cbus=1000 μF, Lbus=1 μH. All caps are low ESR types.
(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total
RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea level
altitude. Be aware of reduced power dissipation with increasing altitude.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed
conditions, Tpcboard=+25 deg.C, full output load, natural air convection.
(5) The input and output are not isolated. They share a single COMMON power and signal return.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected
setting. Output current limit and short circuit protection are non-latching. When the overcurrent fault is
removed, the converter will immediately recover.
(7) The output is not intended to sink appreciable reverse current.
(8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output.
If the overcurrent condition still exists, the restart current will be removed and then tried again. This short
current pulse prevents overheating and damaging the converter.
(9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection,
always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the
full input current rating with nominal input voltage.
(10) Regulation specifications describe the deviation as the line input voltage or output load current is varied
from a nominal midpoint value to either extreme.
(11) CAUTION: Since the converter is mounted on the end by its pins, do not subject it to high vibration, shock or
acceleration.
(12) Output noise may be further reduced by installing an external filter. Do not exceed the maximum output
capacitance. At zero output current and no external capacitor, the output may contain low frequency
components which exceed the ripple specification. The output may be operated indefinitely with no load.
(13) The input must remain above the Undervoltage Shutdown (UVLO) voltage specification at all times to avoid
an unplanned turn off.
www.murata-ps.com
21 May 2010 MDC_OKI-78SR-W36.A01 Page 4 of 10

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OKI-78SR 전자부품, 판매, 대치품
OKI-78SR Serieswww.DataSheet4U.com
Fixed Output 1.5 Amp SIP DC/DC Converters
PERFORMANCE DATA – OKI-78SR5/1.5-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
21 May 2010 MDC_OKI-78SR-W36.A01 Page 7 of 10

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OKI-78SR

Fixed Output 1.5 Amp SIP DC/DC Converters

Murata Manufacturing
Murata Manufacturing

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