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기능 Adjustable Output 3 and 5-Amp DOSA-SMT DC/DC Converters
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OKY-T-3-D12N-C 데이터시트, 핀배열, 회로
www.murata-ps.com
OKY-T/3,T/5-D12 Series
Adjustable Output 3 and 5-Amp DOSA-SMT DC/DC Converters
Typical unit
PRODUCT OVERVIEW
The OKY-T/3 and -T/5 series are miniature
non-isolated Point-of-Load (POL) DC/DC power
converters for embedded applications. The module
is fully compatible with Distributed-power Open
Standards Alliance (DOSA) industry-standard
specifications (www.dosapower.com). Applications
include powering CPU’s, datacom/telecom systems,
programmable logic and mixed voltage systems.
The wide input range is 8.3 to 14 Volts DC. Two
maximum output currents are offered, 3 Amps (T/3
models) or 5 Amps (T/5 models). Based on fixed-
frequency synchronous buck converter switching
topology, the high power conversion efficient Point
of Load (POL) module features programmable
output voltage and On/Off control. These converters
also include under voltage lock out (UVLO), output
short circuit protection, over-current and over
temperature protections.
These units are designed to meet all standard
UL/EN/IEC 60950-1 safety and FCC EMI/RFI
emissions certifications and RoHS-6 hazardous
substance compliance.
FEATURES
Non-isolated SMT POL DC/DC power module
8.3-14Vdc input voltage range
Programmable output voltage from 0.7525-5.5Vdc
3 Amp (T/3) or 5 Amp (T/5) output current models
Drives 1000 μF ceramic capacitive loads
High power conversion efficiency 93% at 3.3 Vout
Outstanding thermal derating performance
Over temperature and over current protection
On/Off control
UL/EN/IEC 60950-1 safety
Industry-standard (DOSA) surface-mount package
RoHS-6 hazardous substance compliance
Contents
Description, Connection Diagram, Photograph
Ordering Guide, Model Numbering
Mechanical Specifications, Input/Output Pinout
Detailed Electrical Specifications
Output Voltage Adjustment, Soldering Guidelines
Technical Notes
Product Label
OKY-T/3-D12 Performance Data and Oscillograms
OKY-T/5-D12 Performance Data and Oscillograms
Tape and Reel Information
Page
1
2
3
4
5
6
8
9
15
21
Connection Diagram
+Vin
F1
On/Off
Control
External
DC
Power
Source
Open = On
Closed = Off
(Positive
On/Off)
Controller
t4XJUDIJOH
t'JMUFST
t$VSSFOU4FOTF
Reference and
Error Amplifier
Common
Figure 1. OKY-T/3, -T/5
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
+Vout
Trim
Common
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_OKY-T/3,T/5-D12 Series.B15 Page 1 of 21




OKY-T-3-D12N-C pdf, 반도체, 판매, 대치품
OKY-T/3,T/5-D12 Series
Adjustable Output 3 and 5-Amp DOSA-SMT DC/DC Converters
Performance and Functional Specifications
See Note 1
Input
Input Voltage Range
See Ordering Guide and Note 7.
Isolation
Not isolated
Start-Up Voltage
7.5 V. min, 8.25 V. max
Undervoltage Shutdown (see Note 15) 7.3 V. min, 8.05 V. max
Overvoltage Shutdown
None
Reflected (Back) Ripple Current (Note 2) 20 mA pk-pk
Internal Input Filter Type
Capacitive
Recommended External Fuse
6A
Reverse Polarity Protection
N/A. See fuse information.
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
Low Line (Vin=Vmin, 5Vout)
See Ordering Guide
0.4 A2Sec.
5 mA
60 mA
1.93 A. (OKY-T/3-D12)
3.24 A. (OKY-T/5-D12)
Remote On/Off Control (Note 5)
Negative Logic (“N” model suffix)
Current
Positive Logic (“P” model suffix)
Current
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
Output Power
15W max. (OKY-T/3)
25W max. (OKY-T/5)
Output Voltage Range
See Ordering Guide
Minimum Loading
No minimum load
Accuracy (50% load, untrimmed)
±2 % of Vnominal
Voltage Output Range (Note 13)
See Ordering Guide
Overvoltage Protection (Note 16)
None
Temperature Coefficient
±0.02% per °C of Vout range
Ripple/Noise (20 MHz bandwidth)
See Ordering Guide and note 8
Line/Load Regulation
See Ordering Guide and note 10
Efficiency
See Ordering Guide
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms
1,000 μF
Cap-ESR >0.01 Ohms
3,000 μF
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up) 7.5 Amps max.
Short Circuit Mode
Short Circuit Current Output
Protection Method
Short Circuit Duration
Prebias Startup
2A
Hiccup autorecovery upon overload
removal. (Note 17)
Continuous, no damage
(output shorted to ground)
Converter will start up if the external
output voltage is less than Vnominal.
Dynamic Characteristics
Dynamic Load Response
90μSec max. to within ±2% of final value
(50-100-50% load step, di/dt=2.5A/µSec)
Start-Up Time
8 mSec for Vout=nominal
(Vin on or On/Off to Vout regulated)
Switching Frequency
320 KHz
Environmental
Calculated MTBF
Telecordia method (4a)
Calculated MTBF
MIL-HDBK-217N2 method (4b)
OKY-T/3-D12N-C: 10,155,200 hours
OKY-T/5-D12P-C: 10,727,300 hours
OKY-T/5-D12N-C: 11,763,400 hours
OKY-T/3-D12N-C: 6,309,035 hours
OKY-T/5-D12P-C: 5,768,500 hours
OKY-T/5-D12N-C: 5,866,256 hours
Operating Temperature Range (Ambient, vertical mount)
See derating curves
-40 to +85 ˚C. with derating (Note 9)
Operating PC Board Temperature
-40 to +100 ˚Celsius max., no derating (12)
Storage Temperature Range
-55 to +125 deg. C.
Thermal Protection/Shutdown
+130 ˚Celsius
Relative Humidity
to 85%/+85 ˚C., non-condensing
Physical
Outline Dimensions
See Mechanical Specifications
Weight
0.1 ounces (2.8 grams)
Electromagnetic Interference
Safety
Restriction of Hazardous Substances
Designed to meet FCC part 15, class B,
EN55022 and CISPR22 class B conducted
and radiated (may need external filter)
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)
MSL Rating
2
Absolute Maximum Ratings
Input Voltage (Continuous or transient) 0 V.to +15 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 specifications
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 Specifications
Table is not implied or recommended.
Specification Notes:
(1) Specifications are typical at +25 °C, Vin=nominal (+12V.), Vout=nominal (+5V), full load, external caps and
natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced
airflow.
All models are tested and specified 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
necessary to accommodate our test equipment and may not be required to achieve specified 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.
(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 tantalum, Cbus=1000 μF electrolytic, Lbus=1 μH.
(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.
(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.
www.murata-ps.com/support
MDC_OKY-T/3,T/5-D12 Series.B15 Page 4 of 21

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OKY-T-3-D12N-C 전자부품, 판매, 대치품
OKY-T/3,T/5-D12 Series
Adjustable Output 3 and 5-Amp DOSA-SMT DC/DC Converters
+OUTPUT
COPPER STRIP
C1
C2 SCOPE
RLOAD
-OUTPUT
COPPER STRIP
C1 = 1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
Minimum Output Loading Requirements
All models regulate within specification and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
hysteresis to prevent rapid on/off cycling.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airflow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that “natural convection” is defined as very flow rates which are not
using fan-forced airflow. Depending on the application, “natural convection” is
usually about 30-65 LFM but is not equal to still air (0 LFM).
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance. As a practical matter,
it is quite difficult to insert an anemometer to precisely measure airflow in
most applications. Sometimes it is possible to estimate the effective airflow if
you thoroughly understand the enclosure geometry, entry/exit orifice areas and
the fan flowrate specifications.
CAUTION: If you routinely or accidentally exceed these Derating guidelines,
the converter may have an unplanned Over Temperature shut down. Also, these
graphs are all collected at slightly above Sea Level altitude. Be sure to reduce
the derating for higher density altitude.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protec-
tion. In the extremely unlikely event of output circuit failure, excessive voltage
could be applied to your circuit. Consider using an appropriate fuse in series
with the output.
Output Current Limiting
Current limiting inception is defined as the point at which full power falls below
the rated tolerance. See the Performance/Functional Specifications. Note par-
ticularly that the output current may briefly rise above its rated value in normal
operation as long as the average output power is not exceeded. This enhances
reliability and continued operation of your application. If the output current is
too high, the converter will enter the short circuit condition.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approxi-
mately 98% of nominal output voltage for most models), the magnetically
coupled voltage used to develop primary side voltages will also drop, thereby
shutting down the PWM controller. Following a time-out period, the PWM will
restart, causing the output voltage to begin ramping up to its appropriate value.
If the short-circuit condition persists, another shutdown cycle will initiate. This
rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the
average output current, thereby preventing excessive internal temperatures
and/or component damage. A short circuit can be tolerated indefinitely.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condi-
tion is removed.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
Please refer to the Connection Diagram on page 1 for On/Off connections.
Positive-polarity models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Positive-polarity devices are disabled
when the On/Off is grounded or brought to within a low voltage (see Specifica-
tions) with respect to –Vin.
Negative-polarity devices are on (enabled) when the On/Off is left open or
brought to within a low voltage (see Specifications) with respect to –Vin. The
device is off (disabled) when the On/Off is pulled high (see Specifications) with
respect to –Vin.
Dynamic control of the On/Off function should be able to sink appropriate
signal current when brought low and withstand appropriate voltage when
brought high. Be aware too that there is a finite time in milliseconds (see
Specifications) between the time of On/Off Control activation and stable,
regulated output. This time will vary slightly with output load type and current
and input conditions.
www.murata-ps.com/support
MDC_OKY-T/3,T/5-D12 Series.B15 Page 7 of 21

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OKY-T-3-D12N-C

Adjustable Output 3 and 5-Amp DOSA-SMT DC/DC Converters

Murata
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