I33115 データシートの表示（PDF） - Murata Manufacturing
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I33115 Datasheet PDF : 11 Pages
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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.
NA
NA
None
Capacitive
See Ordering Guide
0.16 A2Sec.
1 mA
5 mA
5 mA
0.8 Amps (OKI-78SR-3.3/1.5-W36)
1.16 Amps (OKI-78SR-5/1.5-W36)
10 mA pk-pk (OKI-78SR-3.3/1.5-W36)
49 mA pk-pk (OKI-78SR-5/1.5-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-78SR-3.3/1.5-W36)
7.8 Watts (OKI-78SR-5/1.5-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
OKI-78SR Series
Fixed Output 1.5 Amp SIP DC/DC Converters
Environmental
Calculated MTBF (Note 4)
Ambient Temp.
Hours
OKI-78SR-3.3/1.5-W36-C
+25°C
78,721,000
Telecordia method (4a)
+40°C
59,017,000
OKI-78SR-3.3/1.5-W36-C
+25°C
14,587,000
MIL-HDBK-217N2 method (4b)
+40°C
9,814,000
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.
Physical
Outline Dimensions
Weight
Safety
See Mechanical Specifications [11]
0.07 ounces (2 grams)
Certified to UL/cUL 60950-1
CSA-C22.2 No. 60950-1
IEC/EN 60950-1, 2nd Edition (pending)
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.
(4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed
conditions, Tpcboard=+25 ˚C, full output load, natural air convection.
(4b) Mean Time Before Failure is calculated using the MIL-HDBK-217N2 method, ground benign, +25ºC., full
output load, natural 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.
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MDC_OKI-78SR-W36.A06 Page 3 of 11
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