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OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
Performance and Functional Speci?cations
See Note 1
Input
Environmental
Input Voltage Range
See Ordering Guide and Note 7.
Calculated MTBF
Isolation
Not isolated
Telecordia method (4a)
OKY-T/3-W5N-C: 10,961,200 hours
Start-Up Voltage
Undervoltage Shutdown (see Note 15)
Overvoltage Shutdown
2.05 V
1.90 V
None
Calculated MTBF
OKY-T/3-W5P-C: 10,830,600 hours
OKY-T/5-W5N-C: 9,893,917 hours
OKY-T/5-W5P-C: 9,765,731 hours
Re?ected (Back) Ripple Current (Note 2)
Internal Input Filter Type
Recommended External Fuse
20 mA pk-pk
Capacitive
6A
MIL-HDBK-217N2 method (4b)
OKY-T/3-W5N-C:
OKY-T/3-W5P-C:
OKY-T/5-W5N-C:
OKY-T/5-W5P-C:
8,398,873 hours
8,228,758 hours
8,338,304 hours
8,170,610 hours
Reverse Polarity Protection
Input Current:
N/A. See fuse information.
Operating Temperature Range (Ambient, vertical mount)
See derating curves -40 to +85 ?C. with derating (Note 9)
Full Load Conditions
See Ordering Guide
Operating PC Board Temperature
-40 to +100 ?Celsius max., no derating (12)
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
0.4 A2Sec.
5 mA
60 mA
Storage Temperature Range -55 to +125 deg. C.
Thermal Protection/Shutdown +130 ?Celsius
Low Line (Vin=Vmin)
Remote On/Off Control (Note 5)
Negative Logic (“N” model suf?x)
Current
Positive Logic (“P” model suf?x)
Current
Output Power
Output Voltage Range
2.66 A. (OKY-T/3-W5)
4.41 A. (OKY-T/5-W5)
ON = Open pin or ground to +0.4V. max.
OFF = +1.5V min. to +Vin
1 mA max.
ON = Open pin (internally pulled up) or
+7.8Vdc to +Vin max.
OFF = Ground pin to +0.4V. max.
1 mA max.
Output
9.9W max. (OKY-T/3), 16.5W max. (OKY-T/5)
See Ordering Guide
Relative Humidity
Outline Dimensions
Weight
Electromagnetic Interference
Safety
Restriction of Hazardous Substances
MSL Rating
to 85%/+85 ?C., non-condensing
Physical
See Mechanical Speci?cations
0.1 ounces (2.8 grams)
Designed to meet FCC part 15, class B,
EN55022 and CISPR22 class B conducted
and radiated (may need external ?lter)
Designed to meet UL/cUL 60950-1, CSA-
C22.2 No. 60950-1, IEC/EN 60950-1
RoHS-6 ( does not claim EU RoHS exemption
7b–lead in solder )
2
Minimum Loading
Accuracy (50% load, untrimmed)
Voltage Output Range (Note 13)
Overvoltage Protection (Note 16)
Temperature Coef?cient
Ripple/Noise (20 MHz bandwidth)
Line/Load Regulation
Ef?ciency
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms
Cap-ESR >0.01 Ohms
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up)
Short Circuit Mode
Short Circuit Current Output
Protection Method
Short Circuit Duration
Prebias Startup
No minimum load
±2 % of Vnominal
See Ordering Guide
None
±0.02% per °C of Vout range
See Ordering Guide and note 8
See Ordering Guide and note 10
See Ordering Guide
1,000 μF
3,000 μF
5 Amps
2A
Hiccup autorecovery upon overload
removal. (Note 17)
Continuous, no damage
(output shorted to ground)
Converter will start up if the external
Absolute Maximum Ratings
Input Voltage (Continuous or transient) 0 V.to +5.8 Volts max.
On/Off Control 0 V. min. to +Vin max.
Input Reverse Polarity Protection See Fuse section
Output Current (Note 7) Current-limited. Devices can withstand a
sustained short circuit without damage.
The outputs are not intended to accept
appreciable reverse current.
Storage Temperature -55 to +125 ?C.
Lead Temperature See soldering speci?cations
Absolute maximums are stress ratings. Exposure of devices to greater than any of
any of these conditions may adversely affect long-term reliability. Proper operation
under conditions other than those listed in the Performance/Functional Speci?cations
Table is not implied nor recommended.
Speci?cation Notes:
(1) Speci?cations are typical at +25 °C,Vin=nominal (+5V.),Vout=nominal (+3.3V),full load,external caps and
natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced
air?ow.
All models are tested and speci?ed with external 1 μF paralleled with 10μF ceramic/tantalum output
capacitors and a 22 μF external input capacitor. All capacitors are low ESR types. These capacitors are
output voltage is less than Vnominal.
Dynamic Characteristics
necessary to accommodate our test equipment and may not be required to achieve speci?ed performance
in your applications. However, Murata Power Solutions recommends installation of these capacitors. All
models are stable and regulate within spec under no-load conditions.
Dynamic Load Response 90μSec max. to within ±2% of ?nal value
(50-100-50% load step, di/dt=2.5A/μSec)
Start-Up Time 8 mSec for Vout=nominal (Vin On)
(Vin on or On/Off to Vout regulated) 6 mSec for Vout=nominal (Remote On/Off)
(2)
(3)
Input Back Ripple Current is tested and speci?ed over a 5 Hz to 20 MHz bandwidth. Input ?ltering is Cin=2 x
100 μF tantalum, Cbus=1000 μF electrolytic, Lbus=1 μH.
Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower air?ow, the DC/DC converter will tolerate brief full current outputs if the total
RMS current over time does not exceed the Derating curve.
Switching Frequency
300 KHz
(4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground ?xed
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.
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