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OKY-T/10 & T/16-D12 Series
www.murata-ps.com
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PRODUCT OVERVIEW
Typical unit
FEATURES
The OKY-T/10 and -T/16 series are miniature
SMT 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, 10 Amps
(T/10 models) or 16 Amps (T/16 models). Based
on fixed-frequency synchronous buck converter
switching topology, the high power conversion

Wide 8.3-14 VDC input range

Non-isolated output adjustable from 0.7525 to
5.5 Volts up to 16 Amps

DOSA-compatible SMT package
efficient Point of Load (POL) module features programmable output voltage and On/Off control. An
optional Sequence/Tracking input allows controlled
ramp-up and ramp-down outputs. The Sense input
provides remote sense. 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.
Contents
Description, Connection Diagram, Photograph
Ordering Guide, Model Numbering
Mechanical Specifications, Input/Output Pinout
Detailed Electrical Specifications
Output Voltage Adjustment, Soldering Guidelines
Application Notes
Performance Data – OKY2-T/10-D12
Performance Data and Oscillograms – OKY2-T/16-D12
Tape and Reel Information
Product Label, MTBF Table

Optional sequence/tracking operation

Outstanding thermal performance and derating

Short circuit protection

On/Off control

High efficiency up to 94.5%

Over temperature protection

Meets UL/EN/IEC 60950-1 safety approvals.
Page
1
2
3
4
5
6
9
11
16
17
Simplified Block Diagram
+Vin
F1
On/Off
Control
+Vout
t4XJUDIJOH
Controller
Sense
t'JMUFST
t$VSSFOU4FOTF
External
DC
Power
Source
Trim
Open = On
Closed = Off
(Positive
On/Off)
Reference and
Error Amplifier
Common
Common
Figure 1. OKY-T/10, -T/16
Sequence/Tracking (OKY2 only)
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
For full details go to
www.murata-ps.com/rohs
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MDC_OKY_T10T16.D12.A08 Page 1 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Performance Specifications Summary and Ordering Guide
Output
Model Number ➂
Input
R/N (mVp-p) Regulation (Max.) VIN
Efficiency
IOUT
IIN,
IIN,
(Amps Power
Nom. Range no load full load
max) (Watts) Max. 
Line
Load (Volts) (Volts) (mA) (Amps) Min. Typ.
VOUT
(Volts)
On/Off
Polarity
Sequence/
Track
ORDERING GUIDE
Package, C83
Case ➀
Pinout
OKY-T/10-D12P-C 0.7525-5.5
10
50
40
±0.15% ±0.25%
12
8.3-14
80
4.41
93% 94.5%
Pos.
No
1.3x0.53x0.33
(33x13.5x8.4)
P66
OKY-T/10-D12N-C 0.7525-5.5
10
50
40
±0.15% ±0.25%
12
8.3-14
80
4.41
93% 94.5% Neg.
No
1.3x0.53x0.33
(33x13.5x8.4)
P66
OKY2-T/10-D12P-C 0.7525-5.5
10
50
40
±0.15% ±0.25%
12
8.3-14
80
4.41
93% 94.5%
Pos.
Yes
1.3x0.53x0.33
(33x13.5x8.4)
P66
OKY2-T/10-D12N-C 0.7525-5.5
10
50
40
±0.15% ±0.25%
12
8.3-14
80
4.41
93% 94.5% Neg.
Yes
1.3x0.53x0.33
(33x13.5x8.4)
P66
OKY-T/16-D12P-C 0.7525-5.5
16
80
40
±0.22% ±0.25%
12
8.3-14
80
7.09
92.5% 94%
Pos.
No
1.3x0.53x0.33
(33x13.5x8.4)
P66
OKY-T/16-D12N-C 0.7525-5.5
16
80
40
±0.22% ±0.25%
12
8.3-14
80
7.09
92.5% 94%
Neg.
No
1.3x0.53x0.33
(33x13.5x8.4)
P66
OKY2-T/16-D12P-C 0.7525-5.5
16
80
40
±0.22% ±0.25%
12
8.3-14
80
7.09
92.5% 94%
Pos.
Yes
1.3x0.53x0.33
(33x13.5x8.4)
P66
OKY2-T/16-D12N-C 0.7525-5.5
16
80
40
±0.22% ±0.25%
12
8.3-14
80
7.09
92.5% 94%
Neg.
Yes
1.3x0.53x0.33
(33x13.5x8.4)
P66
➀
➁
➂
 Use adequate ground plane and copper thickness adjacent to the converter.
 Ripple and Noise (R/N) is shown at Vout=1V. See specs for details.
Dimensions are in inches (mm).
The input voltage range must be 13.2 Volts max. for Vout >= 3.63 V.
All specifications are at nominal line voltage, Vout=nominal (5V for D12 models) and full load, +25 deg.C.
unless otherwise noted.
Output capacitors are 1 μF ceramic and 10 μF electrolytic in parallel. Input cap is 22 μF. See detailed specifications.
I/O caps are necessary for our test equipment and may not be needed for your application.
PART NUMBER STRUCTURE
OK Y 2 - T / 16 - D12 P - C
Okami Non-isolated PoL
Surface Mount
Sequence/tracking
Blank=Not installed, delete seq/track contact
2=Installed, add seq/track contact
Trimmable Output
Voltage Range
D12 Models = 0.7525-5.5V
RoHS Hazardous
Substance Compliance
C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder)
On/Off Polarity
P = Positive Polarity
N = Negative Polarity
Input Voltage Range
D12 = 8.3-14V
Maximum Rated Output
Current in Amps
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MDC_OKY_T10T16.D12.A08 Page 2 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
MECHANICAL SPECIFICATIONS
PIN #1 THIS
CORNER (FARSIDE)
TOP
VIEW
13.5
0.53
REF
SIDE
VIEW
ISOMETRIC
VIEW
6.7
0.27
12.7
0.50
NOZZLE
PICKUP
POINT
END
VIEW
8.4
0.33
MTG PLANE
2.29
7x0.090
1.59
0.063
33.0
1.30
3.05
0.120
19.30
0.760 REF
3
4
5
6
7
1.91
0.075
2
1
29.89
1.177
10.29
0.405
1
3
1
COMPONENTS SHOWN ARE FOR REFERENCE ONLY
0.120[3.05]MIN
0.135[3.43]MAX
1.91
0.075
2
0.095 [2.41] MIN
0.110 [2.79] MAX
4
5 6
10.29
0.405
7
12.37
0.487
17.20
0.677
7.54
0.297
RECOMMENDED PAD LAYOUT
MATERIAL:
SMT PINS: COPPER ALLOY
THIRD ANGLE PROJECTION
FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
29.90
1.177
22.02
0.867
13.5
0.53
REF
ANGLES:
REF
26.85
1.057
0.64
0.025
TOLERANCES:
2 PLACE .02
3 PLACE .010
13.5
0.53
1.23
0.048
33.0
1.30
DIMENSIONS ARE IN INCHES [mm]
1.59
7x0.063
ALL CONTACTS
COPLANAR
WITHIN .004"
4x
4.83
0.190
BOTTOM
VIEW
0.64
0.025
PIN
#1
0.25
0.010
MIN
1.22
0.048
I/O CONNECTIONS
Pin Function P66
1
On/Off Control *
2
+Vin
3
Vtrack Seq**
4
Gnd (Common)
5
+Vout
6
Trim
7
Sense
* The Remote On/Off can be provided
with either positive (P suffix) or negative
(N suffix) polarity.
** Vtrack Seq applies only to OKY2
models. No connection for OKY models.
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MDC_OKY_T10T16.D12.A08 Page 3 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Performance and Functional Specifications
See Note 1
Output, continued
Input
Input Voltage Range
Start-Up Voltage
Undervoltage Shutdown (see Note 15)
Overvoltage Shutdown
Reflected (Back) Ripple Current (Note 2)
Internal Input Filter Type
Recommended External Fuse
Reverse Polarity Protection
See Ordering Guide.
8.00V
7.75V)
None
20 mA pk-pk
Capacitive
15A (T/10); 20A (T/16)
N/A. See fuse information
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
No Load
Low Line (Vin=Vmin, Vout=Vnom)
See Ordering Guide
0.4 A2Sec.
5 mA
100 mA (T/10); 60 mA (T/16)
80 mA
6.34 A (T/10);10.2 A (T/16)
Short Circuit Duration
Prebias Startup
Dynamic Load Response
75 μSec max. to within ±2% of final value
(50-100% load step, di/dt=2.5A/μSec)
Environmental
Operating Temperature Range (Ambient)
See derating curves
-40 to +85° C. with derating (Note 9)
Operating PC Board Temperature
-40 to +100° C. max.,
no derating (12)
Storage Temperature Range
-55 to +125° C.
Thermal Protection/Shutdown
+130° C.
Relative Humidity
to 85%RH/+85° C., non-condensing
Physical
Remote On/Off Control (Note 5)
Negative Logic (“N” model suffix)
Outline Dimensions
Weight
Electromagnetic Interference
ON = Open pin or ground to +0.3V. max.
OFF =+2.5V min. to + Vin (max)
ON = Open pin to +Vin max.
(internally pulled up)
OFF = Ground pin to +0.3V. max.
1 mA max.
Positive Logic (“P” model suffix)
Current
Tracking/Sequencing
Slew Rate
Tracking accuracy, rising input
Tracking accuracy, falling input
Restriction of Hazardous Substances
2 Volts per millisecond, max.
Vout = +/-100 mV of Sequence In
Vout = +/-200 mV of Sequence In
MSL Rating
Efficiency
Switching Frequency
Absolute Maximum Ratings
See Ordering Guide
300 KHz ± 25 kHz
Start-Up Time (Vin on to Vout regulated) 8 mSec for Vout=nominal
(On/Off to Vout regulated)
8 mSec for Vout=nominal
Isolation
Not isolated
Safety
Meets UL/cUL 60950-1,
CSA-C22.2 No. 60950-1, IEC/EN 60950-1
Calculated MTBF
See table on page 17.
Output
Output Voltage Range
Minimum Loading
Accuracy (50% load, untrimmed)
Overvoltage Protection (Note 16)
Temperature Coefficient
Ripple/Noise (20 MHz bandwidth)
Line/Load Regulation
0.7525 to 5.5 V
No minimum load
±2 % of Vnominal
None
±0.02% per oC of Vout range
See Ordering Guide and note 8
See Ordering Guide and note 10
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms
Cap-ESR >0.01 Ohms
1,000 μF
5,000 μF
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up)
27 Amps (T/10); 33 Amps (T/16)
2A
Hiccup autorecovery upon overload
removal. (Note 17)
See Mechanical Specifications
0.1 ounces (2.8 grams)
Designed to meet FCC part 15, class B,
EN55022 and CISPR22 class B radiated
(may need external filter)
RoHS-6 (does not claim EU RoHS exemption
7b–lead in solder)
2
Input Voltage (Continuous or transient)
On/Off Control
Input Reverse Polarity Protection
Output Current (Note 7)
General and Safety
Short Circuit Mode
Short Circuit Current Output
Protection Method
Continuous, no damage
(output shorted to ground)
Converter will start up if the external
output voltage is less than Vset
Storage Temperature
Lead Temperature
0 V.to +15 Volts max. (D12 models)
0 V. min. to +Vin max.
See Fuse section
Current-limited. Devices can withstand a
sustained short circuit without damage.
The outputs are not intended to accept
appreciable reverse current.
-55 to +125° C.
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 nor recommended.
Specification Notes:
(1)
Specifications are typical at +25 deg.C, Vin=nominal (+12V. for D12 models), Vout=nominal (+5V for D12
models), full load, external caps and natural convection unless otherwise indicated. Extended tests at higher
power must supply substantial forced airflow.
All models are tested and specified with external 1 μF paralleled with 10 μF 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.
(4)
Deleted
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MDC_OKY_T10T16.D12.A08 Page 4 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Specification Notes, Cont.:
Soldering Guidelines
(5)
The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced to
-Input Common. A logic gate may also be used by applying appropriate external voltages which not exceed
+Vin.
(6)
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected
setting.
(7)
Deleted.
(8)
Output noise may be further reduced by adding an external filter. At zero output current, the output may
contain low frequency components which exceed the ripple specification. The output may be operated
indefinitely with no load.
(9)
All models are fully operational and meet published specifications, including “cold start” at –40°C.
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
specifications may cause damage to the product. Your production environment
may differ therefore please thoroughly review these guidelines with your process
engineers.
Reflow Solder Operations for surface-mount products (SMT)
(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.
For Sn/Ag/Cu based solders:
(11) Other input or output voltage ranges will be reviewed under scheduled quantity special order.
Preheat Temperature
Less than 1 ºC. per second
Time over Liquidus
45 to 75 seconds
(12) Maximum PC board temperature is measured with the sensor in the center of the converter.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external
output capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will
reduce output noise but may change the transient response. Newer ceramic caps with very low ESR may
require lower capacitor values to avoid instability. Thoroughly test your capacitors in the application. Please
refer to the Output Capacitive Load Application Note.
Maximum Peak Temperature
260 ºC.
Cooling Rate
Less than 3 ºC. per second
For Sn/Pb based solders:
Preheat Temperature
Less than 1 ºC. per second
Time over Liquidus
60 to 75 seconds
(16) The output is not intended to sink appreciable reverse current.
Maximum Peak Temperature
235 ºC.
(17) “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. Once the fault is removed, the converter
immediately recovers normal operation.
Cooling Rate
Less than 3 ºC. per second
(15) Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times.
Otherwise, you risk having the converter turn off. The undervoltage shutdown is not latching and will
attempt to recover when the input is brought back into normal operating range.
Recommended Lead-free Solder Reflow Profile
Output Voltage Adjustment
Peak Temp.
235-260° C
250
In the tables opposite, the calculated resistance is given. Do not exceed
the specified limits of the output voltage or the converter’s maximum power
rating when applying these resistors. Also, avoid high noise at the Trim
input. However, to prevent instability, you should never connect any capacitors to Trim.
200
Temperature (°C)
The output voltage may be adjusted over a limited range by connecting an external trim resistor (Rtrim) between the Trim pin and Ground. The
Rtrim resistor must be a 1/10 Watt precision metal film type, ±1% accuracy
or better with low temperature coefficient, ±100 ppm/°C. or better. Mount
the resistor close to the converter with very short leads or use a surface
mount trim resistor.
Reflow Zone
150
Soaking Zone
time above 217° C
45-75 sec
120 sec max
100
<1.5° C/sec
High trace = normal upper limit
Low trace = normal lower limit
Preheating Zone
50
240 sec max
0
0
30
60
90
120
150
180
210
240
270
300
Time (sec)
High trace = normal upper limit
OKY2-T/10-D12, -T/16-D12
Low trace - normal lower limit
Output Voltage
Calculated Rtrim (KΩ)
5.0 V.
1.472
3.3 V.
3.122
2.5 V.
5.009
2.0 V.
7.416
1.8 V.
9.024
1.5 V.
13.05
1.2 V.
22.46
1.0 V.
41.424
0.7525 V.
∞ (open)
Resistor Trim Equation, D12 models:
10500
RTRIM () = _____________ –1000
VOUT – 0.7525V
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MDC_OKY_T10T16.D12.A08 Page 5 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
APPLICATION NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. We
recommend a time delay fuse installed in the ungrounded input supply line
with a value which is approximately twice the maximum line current, calculated at the lowest input voltage. Please refer to the Specifications.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard, i.e. IEC/EN/UL 60950-1.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up input voltage exceeds and remains at the Start-Up
Threshold Voltage (see Specifications). Once operating, converters will not
turn off until the input voltage drops below the Under-Voltage Shutdown Limit.
Subsequent restart will not occur until the input voltage rises again above the
Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as poorly
regulated capacitor inputs), the converter shuts off and then restarts as the
external capacitor recharges. Such situations could oscillate. To prevent this,
make sure the operating input voltage is well above the UV Shutdown voltage
AT ALL TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) is the time interval between the point when
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified regulation
band. Actual measured times will vary with input source impedance, external
input capacitance, input voltage slew rate and final value of the input voltage
as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
suggested capacitor values are 10 to 22 μF, rated at twice the expected maximum input voltage. Make sure that the input terminals do not go below the
undervoltage shutdown voltage at all times. More input bulk capacitance may
be added in parallel (either electrolytic or tantalum) if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response.
Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.
Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in
parallel. Mount these close to the converter. Measure the output ripple under
your load conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capacitance listed in the specifications.
Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. The Cbus and Lbus
components simulate a typical DC voltage bus. Please note that the values of
Cin, Lbus and Cbus may vary according to the specific converter model.
TO
OSCILLOSCOPE
CURRENT
PROBE
+INPUT
VIN
+
–
+
–
LBUS
CBUS
CIN
-INPUT
CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz
CBUS = 1000μF, ESR < 100mΩ @ 100kHz
LBUS = 1μH
Figure 2. Measuring Input Ripple Current
The On/Off Remote Control interval from On command to Vout regulated
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to Vout regulated specification
such as external load capacitance and soft start circuitry.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to provide
dynamic stability and that the input supply has little or no inductive content,
including long distributed wiring to a remote power supply. The converter will
operate with no additional external capacitance if these conditions are met.
For best performance, we recommend installing a low-ESR capacitor
immediately adjacent to the converter’s input terminals. The capacitor should
be a ceramic type such as the Murata GRM32 series or a polymer type. Initial
In figure 3, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. In order to minimize circuit
errors and standardize tests between units, scope measurements should be
made using BNC connectors or the probe ground should not exceed one half
inch and soldered directly to the test circuit.
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
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MDC_OKY_T10T16.D12.A08 Page 6 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
COPPER STRIP
+SENSE
+OUTPUT
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)
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
temperature 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 application 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 very low flow rates (below about 25 LFM) are similar to “natural
convection”, that is, not using fan-forced airflow.
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 (approximately 98% of nominal output voltage for most models), the PWM controller
will shut down. 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.
Remote Sense Input
The Sense input is normally connected at the load for the respective Sense
polarity (+Sense to the +Vout load). The sense input compensates for voltage
drops along the output wiring such as moderate IR drops and the current
carrying capacity of PC board etch. This output drop (the difference between
Sense and Vout when measured at the converter) should not exceed 0.5V. Use
heavier connections if this drop is excessive. The sense input also improves the
stability of the converter and load system by optimizing the control loop phase
margin.
If the Sense function is not used for remote regulation, the user should connect the Sense to their respective Vout at the converter pins.
Sense lines on the PCB should run adjacent to DC signals, preferably
Ground. Any long, distributed wiring and/or significant inductance introduced
into the Sense control loop can adversely affect overall system stability. If in
doubt, test your applications by observing the converter’s output transient
response during step loads. There should not be any appreciable ringing or
oscillation.
Do not exceed maximum power ratings. Excessive voltage differences
between Vout and Sense together with trim adjustment of the output can cause
the overvoltage protection circuit to activate and shut down the output.
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage at the ouput pins. Therefore the
designer must insure:
(Vout at pins) x (Iout) ≤ (Max. rated output power)
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.
Remote On/Off Control
The remote On/Off Control can be ordered with either polarity. Please refer to
the Connection Diagram on page 1 for On/Off connections.
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.
Positive polarity models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Therefore, the On/Off control can be
disconnected if the converter should always be on. Positive-polarity devices are
disabled when the On/Off is grounded or brought to within a low voltage (see
Specifications) with respect to –Vin.
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 particularly 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.
Negative polarity devices are on (enabled) when the On/Off pin 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.
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MDC_OKY_T10T16.D12.A08 Page 7 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Dynamic control of the On/Off function must 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.
[2] Allow the converter to stabilize (typically less than 20 mS after +Vin
power on) before raising the Sequence/Tracking input. Also, if you wish to have
a ramped power down, leave +Vin powered all during the down ramp. Do not
simply shut off power.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifications. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve your noise and surge response objectives. Excess
external capacitance may cause regulation problems and possible oscillation
or instability. Proper wiring of the Sense inputs will improve these factors under
capacitive load.
[4] Observe the Output slew rate relative to the Sequence/Tracking input.
A rough guide is 2 Volts per millisecond maximum slew rate. If you exceed
this slew rate on the Sequence/Tracking pin, the converter will simply ramp
up at it’s maximum output slew rate (and will not necessarily track the faster
Sequence/Tracking input).
The maximum rated output capacitance and ESR specification is given for a
capacitor installed immediately adjacent to the converter. Any extended output
wiring, smaller wire gauge or less ground plane may tolerate somewhat higher
capacitance. Also, capacitors with higher ESR may use a larger capacitance.
[5] Be aware of the input characteristics of the Sequence/Tracking pin. The
high input impedance affects the time constant of any small external ramp
capacitor. And the bias current will slowly charge up any external caps over
time if they are not grounded.
Sequence/Tracking Input (Optional)
After external input power is applied and the converter stabilizes, a high
impedance Sequence/Tracking input pin accepts an external analog voltage referred to -Vin. The output power voltage will then track this Sequence/
Tracking input at a one-to-one ratio up to the nominal set point voltage for that
converter. This Sequencing input may be ramped, delayed, stepped or otherwise phased as needed for the output power, all fully controlled by the user’s
external circuits. As a direct input to the converter’s feedback loop, response to
the Sequence/Tracking input is very fast (milliseconds).
[6] Allow the converter to eventually achieve its full rated setpoint output
voltage. Do not remain in ramp up/down mode indefinitely. The converter is
characterized and meets all its specifications only at the setpoint voltage (plus
or minus any trim voltage).
Operation
To use the Sequence/Tracking pin after power start-up stabilizes, apply a
rising external voltage to the Sequence/Tracking input. As the voltage rises, the
output voltage will track the Sequence/Tracking input (gain = 1). The output
voltage will stop rising when it reaches the normal set point for the converter.
The Sequence/Tracking input may optionally continue to rise without any effect
on the output. Keep the Sequence/Tracking input voltage below the converter’s
input supply voltage.
Use a similar strategy on power down. The output voltage will stay constant
until the Sequence/Tracking input falls below the set point.
Guidelines for Sequence/Tracking Applications
[3] If you do not plan to use the Sequence/Tracking pin, leave it open.
The reason to carefully consider the slew rate limitation is in case you want
two different POL’s to precisely track each other.
[7] The Sequence/Tracking is a sensitive input into the feedback control loop
of the converter. Avoid noise and long leads on this input. Keep all wiring very
short. Use shielding if necessary.
Pre-Biased Startup
Some sections have external power already partially applied (possibly because
of earlier power sequencing) before POL power up. Or leakage power is present so that the DC/DC converter must power up into an existing output voltage.
This power may either be stored in an external bypass capacitor or supplied by
an active source. These converters include a pre-bias startup mode to prevent
initialization problems.
This “pre-biased” condition can also occur with some types of programmable logic or because of blocking diode leakage or small currents passed
through forward biased ESD diodes. This feature is variously called “monotonic” because the voltage does not decay or produce a negative transient
once the input power is applied and startup begins.
Sequence/Tracking operation is not available during pre-bias startup.
[1] Leave the converter’s On/Off Enable control in the On setting. Normally,
you should just leave the On/Off pin open.
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MDC_OKY_T10T16.D12.A08 Page 8 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA – OKY2-T/10-D12
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 0.7525V)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1V)
84
85
79
80
Efficiency (%)
Efficiency (%)
VIN = 8.3V
VIN = 12V
VIN = 14V
74
69
VIN = 8.3V
VIN = 12V
VIN = 14V
75
70
64
65
59
60
54
1
2
3
4
5
6
7
8
9
1
10
2
3
4
Load Curre nt (Amps)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.2)
7
8
9
10
86
VIN = 8.3V
VIN = 12V
VIN = 14V
80
Efficiency (%)
Efficiency (%)
6
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.5V)
85
75
70
VIN = 8.3V
VIN = 12V
VIN = 14V
81
76
71
65
66
1
2
3
4
5
6
7
8
9
10
1
2
3
4
Load Curre nt (Amps)
5
6
7
8
9
10
Load Curre nt (Amps)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.8)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 2.5V)
93
90
91
88
89
86
VIN = 8.3V
VIN = 12V
VIN = 14V
84
82
80
85
83
78
81
76
79
74
77
72
1
2
3
4
5
VIN = 8.3V
VIN = 12V
VIN = 14V
87
Efficiency (%)
Efficiency (%)
5
Load Curre nt (Amps)
6
Load Curre nt (Amps)
7
8
9
10
75
1
2
3
4
5
6
7
8
9
10
Load Curre nt (Amps)
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MDC_OKY_T10T16.D12.A08 Page 9 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA – OKY2-T/10-D12
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 5V)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 3.3V)
95
93
91
VIN = 8.3V
VIN = 12V
VIN = 14V
87
90
Efficiency (%)
Efficiency (%)
89
85
83
VIN = 8.3V
VIN = 12V
VIN = 13.2V
85
81
80
79
77
75
1
2
3
4
5
6
7
8
9
75
10
1
2
3
4
Load Curre nt (Amps)
5
6
7
8
9
10
Load Curre nt (Amps)
OKY2-T/10-D12-C Maximum Current Temperature Derating at Sea Level
(VIN= 12V, VOUT = 0.75 to 5V).
11
10
Natural convection
Output Current (Amps)
9
8
7
6
5
4
3
2
1
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
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MDC_OKY_T10T16.D12.A08 Page 10 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 0.7525V)
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level
(VIN= 12V, VOUT = 0.75V).
84
17
79
VIN = 8.3V
VIN = 12V
VIN = 14V
74
Efficiency (%)
Output Current (Amps)
16
69
64
15
Natural convection
100 LFM
200 LFM
300 LFM
400 LFM
14
13
12
59
11
54
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
10
20
16
25
30
35
40
45
Load Curre nt (Amps)
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1V)
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.2)
85
85
VIN = 8.3V
VIN = 12V
VIN = 14V
75
Efficiency (%)
Efficiency (%)
80
70
VIN = 8.3V
VIN = 12V
VIN = 14V
80
75
70
65
65
60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
16
2
3
4
5
6
Load Curre nt (Amps)
7
8
9
10
11
12
13
14
15
16
Load Curre nt (Amps)
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.5V)
Efficiency (%)
86
VIN = 8.3V
VIN = 12V
VIN = 14V
81
76
71
66
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Load Curre nt (Amps)
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MDC_OKY_T10T16.D12.A08 Page 11 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12
On/Off Enable Startup Delay (Vin=8.3V, Vout=1.5V, Iout=16A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=1.5V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=1.5V, Cload=0, Iout=8A to 16A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=1.5V, Cload=0, Iout=16A to 8A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.8)
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level
(VIN= 12V, VOUT = 1.8V).
90
17
88
16
Output Current (Amps)
Efficiency (%)
86
VIN = 8.3V
VIN = 12V
VIN = 14V
84
82
80
78
15
Natural convection
100 LFM
200 LFM
300 LFM
400 LFM
14
13
76
12
74
11
72
1
2
3
4
5
6
7
8
9
10
Load Curre nt (Amps)
11
12
13
14
15
16
10
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
In this graphic data, 10 Amp models perform identically to 16 Amp models with the limitation of 10 Amps output.
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MDC_OKY_T10T16.D12.A08 Page 12 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 2.5V)
93
91
89
VIN = 8.3V
VIN = 12V
VIN = 14V
Efficiency (%)
87
85
83
81
79
77
75
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Load Curre nt (Amps)
On/Off Enable Startup Delay (Vin=8.3V, Vout=2.5V, Iout=16A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=2.5V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=2.5V, Cload=0, Iout=8A to 16A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=2.5V, Cload=0, Iout=16A to 8A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
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MDC_OKY_T10T16.D12.A08 Page 13 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 3.3V)
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level
(VIN= 12V, VOUT = 3.3V).
17
93
91
16
Output Current (Amps)
Efficiency (%)
89
VIN = 8.3V
VIN = 12V
VIN = 14V
87
85
83
15
Natural convection
100 LFM
200 LFM
300 LFM
400 LFM
14
13
81
12
79
11
77
75
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Load Curre nt (Amps)
16
10
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
On/Off Enable Startup Delay (Vin=8.3V, Vout=3.3V, Iout=16A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=3.3V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=3.3V, Cload=0, Iout=8A to 16A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=3.3V, Cload=0, Iout=16A to 8A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
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MDC_OKY_T10T16.D12.A08 Page 14 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 5V)
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level
(VIN= 12V, VOUT = 5V)
17
95
Efficiency (%)
90
Output Current (Amps)
16
VIN = 8.3V
VIN = 12V
VIN = 13.2V
85
80
15
Natural convection
100 LFM
200 LFM
300 LFM
400 LFM
14
13
12
11
75
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Load Curre nt (Amps)
16
10
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
On/Off Enable Startup Delay (Vin=8.3V, Vout=5V, Iout=16A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=5V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=5V, Cload=0, Iout=8A to 16A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=5V, Cload=0, Iout=16A to 8A)
Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
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MDC_OKY_T10T16.D12.A08 Page 15 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
TAPE & REEL IMFORMATION
FEED (UNWIND)
DIRECTION ------2.00
.079
(P/U)
44.00
1.732
4.00
.157
ROUND
HOLES
PIN
#1
1.75
.069
18.19
.716
(P/U)
40.40
1.591
2.00
.079
KEY IN
POCKET
24.00
.945
9.14
.360
OBLONG
HOLES
TOP COVER TAPE
THIRD ANGLE PROJECTION
.53
REF
PIN #1 THIS
CORNER
(FARSIDE)
101.6
4.00
(CORE)
44.0
1.73
REF
.50
330.2
13.00
1.30
REF
PICKUP
NOZZLE
LOCATION
( 3-6mm)
13.00
.512
.27
REEL INFORMATION
(250 UNITS PER REEL)
PICK & PLACE PICKUP (P/U)
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MDC_OKY_T10T16.D12.A08 Page 16 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Product Label
Because of the small size of these products, the product label contains a
character-reduced code to indicate the model number and manufacturing date
code. Not all items on the label are always used. Please note that the label
differs from the product photograph. Here is the layout of the label:
Mfg.
date
code
Y01110
Product code
YMDX Rev.
Revision level
Figure 4. Label Artwork Layout
Model Number
Product Code
OKY-T/10-D12P-C
Y01110
OKY-T/10-D12N-C
Y00110
OKY2-T/10-D12P-C
Y21110
OKY2-T/10-D12N-C
Y20110
OKY-T/16-D12P-C
Y01116
OKY-T/16-D12N-C
Y00116
OKY2-T/16-D12P-C
Y21116
OKY2-T/16-D12N-C
Y20116
The label contains three rows of information:
The manufacturing date code is four characters:
First row – Murata Power Solutions logo
Second row – Model number product code (see table)
Third row – Manufacturing date code and revision level
First character – Last digit of manufacturing year, example 2009
Second character – Month code (1 through 9 and O through D)
Third character – Day code (1 through 9 = 1 to 9, 10=O and
11 through 31 = A through Z)
Fourth character – Manufacturing information
Mean Time Before Failure (MTBF) Table
These figures use a standard MTBF probability calculation as an indication of component parts stress and life derating. The calculaton is based on separate MTBF
values for all internal parts in addition to stated environmental conditions. Two MTBF values are presented. The Telcordia method is widely used in industry, particularly telecom. The United States MIL-HDBK method is for military and industrial applications. Please refer to a qualified reliability engineer for more background.
Model Number
MTBF (Hours)
Method [1,2]
OKY2-T/16-D12N-C
7,027,574
Telcordia
OKY2-T/16-D12N-C
5,506,128
MIL-HDBK
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
Notes:
[1]
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ISSUE 2,
ground fixed controlled conditions, Tambient=+25°C, full output load, natural air convection.
[2]
Mean Time Before Failure is calculated using MIL-HDBK-217FN2, GB ground benign,
Tambient=+25°C, full output load, natural air convection.
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2012 Murata Power Solutions, Inc.
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MDC_OKY_T10T16.D12.A08 Page 17 of 17