OKY2-T/16-D12P-C - Murata Power Solutions

Figure 1. OKY-T/10, -T/16

Simpliﬁ ed Block Diagram

Note: Murata Power Solutions strongly recommends an external input fuse, F1.

See speciﬁ cations.

External

Power

Source

F1 On/Off

Control

CommonCommon

Sequence/Tracking (OKY2 only)

Open = On

Closed = Off

+Vin +Vout

Trim

Sense

Controller

Reference and

Error Ampliﬁer

t4XJUDIJOH

t'JMUFST

t$VSSFOU4FOTF

(Positive

On/Off)

FEATURES



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



Optional sequence/tracking operation



Outstanding thermal performance and derating



Short circuit protection



On/Off control



High efﬁ ciency up to 94.5%



Over temperature protection



Meets UL/EN/IEC 60950-1 safety approvals.

Contents Page

Description, Connection Diagram, Photograph 1

Ordering Guide, Model Numbering 2

Mechanical Speciﬁ cations, Input/Output Pinout 3

Detailed Electrical Speciﬁ cations 4

Output Voltage Adjustment, Soldering Guidelines 5

Application Notes 6

Performance Data – OKY2-T/10-D12 9

Performance Data and Oscillograms – OKY2-T/16-D12 11

Tape and Reel Information 16

Product Label, MTBF Table 17

Typical unitTypical uni

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 1 of 17

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

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

speciﬁ cations (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 ﬁ xed-frequency synchronous buck converter

switching topology, the high power conversion

efﬁ cient Point of Load (POL) module features pro-

grammable 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 tempera-

ture protections.

These units are designed to meet all standard

UL/EN/IEC 60950-1 safety and FCC EMI/RFI

emissions certiﬁ cations and RoHS-6 hazardous

substance compliance.

PRODUCT OVERVIEW

PART NUMBER STRUCTURE

➀ Dimensions are in inches (mm).

➁ The input voltage range must be 13.2 Volts max. for Vout >= 3.63 V.

➂ 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.

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.

ORDERING GUIDE

Model Number ➂

Output Input

Efﬁ ciency

On/Off

Polarity

Sequence/

Track

Package, C83

VOUT

(Volts)

IOUT

(Amps

max)

Power

(Watts)

R/N (mVp-p) Regulation (Max.) VIN

Nom.

(Volts)

Range

(Volts)

IIN,

no load

(mA)

IIN,

full load

(Amps) Case ➀PinoutMax. Line Load Min. Typ.

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

Performance Speciﬁ cations Summary and Ordering Guide

Surface Mount

Maximum Rated Output

Current in Amps

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

Input Voltage Range

D12 = 8.3-14V

On/Off Polarity

P = Positive Polarity

N = Negative Polarity

OK 2Y -/ D12-T 16 C-

RoHS Hazardous

Substance Compliance

C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder)

Okami Non-isolated PoL

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 2 of 17

www.murata-ps.com/support

MECHANICAL SPECIFICATIONS

THIRD ANGLE PROJECTION

0.33

8.4

0.063

1.59

0.190

4.83

0.760 REF

19.30

0.120

3.05

0.025

0.64

0.405

10.29

0.075

1.91

0.048

1.23

1.177

29.89

0.53

REF

13.5

1.30 REF

33.0

0.075

1.91

0.048

1.22

0.025

0.64

0.405

10.29

0.297

7.54

0.487

12.37

0.677

17.20

0.867

22.02

1.057

26.85 1.177

29.90

0.50

12.7

0.27

6.7

VIEW

END

7x0.063

1.59

0.010

MIN

0.25

WITHIN .004"

COPLANAR

SIDE

ALL CONTACTS

VIEW

MTG PLANE

7x0.090

2.29

VIEW

BOTTOM

1.30

33.0

0.53

13.5

435

RECOMMENDED PAD LAYOUT

0.120[3.05]MIN

0.135[3.43]MAX

0.095 [2.41] MIN

0.110 [2.79] MAX

TOLERANCES:

GOLD (5u"MIN) OVER NICKEL (50u" MIN)

DIMENSIONS ARE IN INCHES [mm]

COMPONENTS SHOWN ARE FOR REFERENCE ONLY

.010

.02 ANGLES:

3 PLACE

SMT PINS: COPPER ALLOY

2 PLACE

MATERIAL:

FINISH: (ALL PINS)

CORNER (FARSIDE)

PIN #1 THIS

POINT

VIEW

TOP

PICKUP

NOZZLE

0.53

REF

13.5

VIEW

ISOMETRIC

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 sufﬁ x) or negative

(N sufﬁ x) polarity.

** Vtrack Seq applies only to OKY2

models. No connection for OKY models.

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 3 of 17

www.murata-ps.com/support

Performance and Functional Speciﬁ cations

See Note 1

Input

Input Voltage Range See Ordering Guide.

Start-Up Voltage 8.00V

Undervoltage Shutdown (see Note 15) 7.75V)

Overvoltage Shutdown None

Reﬂ ected (Back) Ripple Current (Note 2) 20 mA pk-pk

Internal Input Filter Type Capacitive

Recommended External Fuse 15A (T/10); 20A (T/16)

Reverse Polarity Protection N/A. See fuse information

Input Current:

Full Load Conditions See Ordering Guide

Inrush Transient 0.4 A2Sec.

Shutdown Mode (Off, UV, OT) 5 mA

Output in Short Circuit 100 mA (T/10); 60 mA (T/16)

No Load 80 mA

Low Line (Vin=Vmin, Vout=Vnom) 6.34 A (T/10);10.2 A (T/16)

Remote On/Off Control (Note 5)

Negative Logic (“N” model sufﬁ x) ON = Open pin or ground to +0.3V. max.

OFF =+2.5V min. to + Vin (max)

Positive Logic (“P” model sufﬁ x) ON = Open pin to +Vin max.

(internally pulled up)

OFF = Ground pin to +0.3V. max.

Current 1 mA max.

Tracking/Sequencing

Slew Rate 2 Volts per millisecond, max.

Tracking accuracy, rising input Vout = +/-100 mV of Sequence In

Tracking accuracy, falling input Vout = +/-200 mV of Sequence In

General and Safety

Efﬁ ciency See Ordering Guide

Switching Frequency 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 0.7525 to 5.5 V

Minimum Loading No minimum load

Accuracy (50% load, untrimmed) ±2 % of Vnominal

Overvoltage Protection (Note 16) None

Temperature Coefﬁ cient ±0.02% per oC of Vout range

Ripple/Noise (20 MHz bandwidth) See Ordering Guide and note 8

Line/Load Regulation See Ordering Guide and note 10

Maximum Capacitive Loading (Note 14)

Cap-ESR=0.001 to 0.01 Ohms 1,000 F

Cap-ESR >0.01 Ohms 5,000 F

Current Limit Inception (Note 6) 27 Amps (T/10); 33 Amps (T/16)

(98% of Vout setting, after warm up)

Short Circuit Mode

Short Circuit Current Output 2 A

Protection Method Hiccup autorecovery upon overload

removal. (Note 17)

Output, continued

Short Circuit Duration Continuous, no damage

(output shorted to ground)

Prebias Startup Converter will start up if the external

output voltage is less than Vset

Dynamic Load Response 75 Sec max. to within ±2% of ﬁ nal value

(50-100% load step, di/dt=2.5A/Sec)

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

Outline Dimensions See Mechanical Speciﬁ cations

Weight 0.1 ounces (2.8 grams)

Electromagnetic Interference Designed to meet FCC part 15, class B,

EN55022 and CISPR22 class B radiated

(may need external ﬁ lter)

Restriction of Hazardous Substances 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. (D12 models)

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 speciﬁ 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 Speciﬁ cations Table is

not implied nor recommended.

Speciﬁ cation 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 F paralleled with 10 F ceramic/tantalum output

capacitors and a 22 F 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 F tantalum, Cbus=1000 F electrolytic, Lbus=1 H.

(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

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 4 of 17

www.murata-ps.com/support

Speciﬁ cation Notes, Cont.:

(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.

(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) Other input or output voltage ranges will be reviewed under scheduled quantity special order.

(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.

(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.

(16) The output is not intended to sink appreciable reverse current.

(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.

Output Voltage Adjustment

The output voltage may be adjusted over a limited range by connect-

ing an external trim resistor (Rtrim) between the Trim pin and Ground. The

Rtrim resistor must be a 1/10 Watt precision metal ﬁ lm type, ±1% accuracy

or better with low temperature coefﬁ cient, ±100 ppm/°C. or better. Mount

the resistor close to the converter with very short leads or use a surface

mount trim resistor.

In the tables opposite, the calculated resistance is given. Do not exceed

the speciﬁ ed 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 capaci-

tors to Trim.

RTRIM () = _____________ –1000

VOUT – 0.7525V

10500

OKY2-T/10-D12, -T/16-D12

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:

Soldering Guidelines

Murata Power Solutions recommends the speciﬁ cations below when installing these

converters. These speciﬁ cations vary depending on the solder type. Exceeding these

speciﬁ cations may cause damage to the product. Your production environment

may differ therefore please thoroughly review these guidelines with your process

engineers.

Recommended Lead-free Solder Reﬂ ow Proﬁ le

High trace = normal upper limit

Low trace - normal lower limit

100

150

200

250

0 30 60 90 120 150 180 210 240 270 300

Time (sec)

Temperature (°C)

Preheating Zone

240 sec max

Soaking Zone

120 sec max

Reﬂow Zone

time above 217° C

45-75 sec

Peak Temp.

235-260° C

<1.5° C/sec High trace = normal upper limit

Low trace = normal lower limit

Reflow Solder Operations for surface-mount products (SMT)

For Sn/Ag/Cu based solders:

Preheat Temperature Less than 1 ºC. per second

Time over Liquidus 45 to 75 seconds

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

Maximum Peak Temperature 235 ºC.

Cooling Rate Less than 3 ºC. per second

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 5 of 17

www.murata-ps.com/support

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, calcu-

lated at the lowest input voltage. Please refer to the Speciﬁ cations.

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 Speciﬁ cations). 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 opera-

tion 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 Speciﬁ cations) 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 speciﬁ ed regulation

band. Actual measured times will vary with input source impedance, external

input capacitance, input voltage slew rate and ﬁ nal 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.

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 speciﬁ ed accuracy

band. The speciﬁ cation assumes that the output is fully loaded at maximum

rated current. Similar conditions apply to the On to Vout regulated speciﬁ cation

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

APPLICATION NOTES suggested capacitor values are 10 to 22 µF, rated at twice the expected maxi-

mum 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 capaci-

tance 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 capaci-

tance listed in the speciﬁ cations.

Input Ripple Current and Output Noise

All models in this converter series are tested and speciﬁ ed for input reﬂ ected

ripple current and output noise using designated external input/output com-

ponents, circuits and layout as shown in the ﬁ gures 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 speciﬁ c converter model.

In ﬁ gure 3, the two copper strips simulate real-world printed circuit imped-

ances 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 speciﬁ cation 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

BUS

= 2 x 100µF, ESR < 700mΩ @ 100kHz

BUS

= 1000µF, ESR < 100mΩ @ 100kHz

BUS

= 1µH

+INPUT

-INPUT

CURRENT

PROBE

OSCILLOSCOPE

–

Figure 2. Measuring Input Ripple Current

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 6 of 17

www.murata-ps.com/support

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 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 airﬂ ow measured in Linear Feet per Minute (“LFM”).

Note that these are AVERAGE measurements. The converter will accept brief

increases in current or reduced airﬂ ow as long as the average is not exceeded.

Note that the temperatures are of the ambient airﬂ ow, not the converter

itself which is obviously running at higher temperature than the outside air.

Also note that very low ﬂ ow rates (below about 25 LFM) are similar to “natural

convection”, that is, not using fan-forced airﬂ ow.

Murata Power Solutions makes Characterization measurements in a closed

cycle wind tunnel with calibrated airﬂ ow. We use both thermocouples and an

infrared camera system to observe thermal performance.

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 Current Limiting

Current limiting inception is deﬁ ned as the point at which full power falls

below the rated tolerance. See the Performance/Functional Speciﬁ cations.

Note particularly that the output current may brieﬂ y 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 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 cur-

rent, thereby preventing excessive internal temperatures and/or component

damage. A short circuit can be tolerated indeﬁ nitely.

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 con-

nect 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 signiﬁ cant 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)

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.

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

Speciﬁ cations) with respect to –Vin.

Negative polarity devices are on (enabled) when the On/Off pin is left open

or brought to within a low voltage (see Speciﬁ cations) with respect to –Vin. The

device is off (disabled) when the On/Off is pulled high (see Speciﬁ cations) with

respect to –Vin.

C1 = 1µF CERAMIC

C2 = 10µF TANTALUM

LOAD 2-3 INCHES (51-76mm) FROM MODULE

C2 R

LOAD

COPPER STRIP

SCOPE

+OUTPUT

+SENSE

-OUTPUT

Figure 3. Measuring Output Ripple and Noise (PARD)

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 7 of 17

www.murata-ps.com/support

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 ﬁ nite time in milliseconds (see Speciﬁ cations)

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.

Output Capacitive Load

These converters do not require external capacitance added to achieve rated

speciﬁ cations. 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.

The maximum rated output capacitance and ESR speciﬁ cation 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.

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 volt-

age 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 other-

wise 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).

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

[1] Leave the converter’s On/Off Enable control in the On setting. Normally,

you should just leave the On/Off pin open.

[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.

[3] If you do not plan to use the Sequence/Tracking pin, leave it open.

[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 reason to carefully consider the slew rate limitation is in case you want

two different POL’s to precisely track each other.

[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.

[6] Allow the converter to eventually achieve its full rated setpoint output

voltage. Do not remain in ramp up/down mode indeﬁ nitely. The converter is

characterized and meets all its speciﬁ cations only at the setpoint voltage (plus

or minus any trim voltage).

[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 pres-

ent 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 program-

mable logic or because of blocking diode leakage or small currents passed

through forward biased ESD diodes. This feature is variously called “mono-

tonic” 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.

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 8 of 17

www.murata-ps.com/support

PERFORMANCE DATA – OKY2-T/10-D12

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 0.7525V)

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1.2)

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1.8)

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1V)

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1.5V)

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 2.5V)

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 9 of 17

www.murata-ps.com/support

PERFORMANCE DATA – OKY2-T/10-D12

OKY2-T/10-D12-C Maximum Current Temperature Derating at Sea Level

(VIN= 12V, VOUT = 0.75 to 5V).

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 3.3V)

OKY2-T/10-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 5V)

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

12345678910

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 13.2V

20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

Natural convection

Ambient Temperature (ºC)

Output Current (Amps)

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 10 of 17

www.murata-ps.com/support

PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 0.7525V)

1 2 3 4 5 6 7 8 9 10111213141516

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1.2)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1V)

12345678910111213141516

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1.5V)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level

(VIN= 12V, VOUT = 0.75V).

20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

Ambient Temperature (ºC)

Output Current (Amps)

Natural convection

100 LFM

200 LFM

300 LFM

400 LFM

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 11 of 17

www.murata-ps.com/support

PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 1.8)

On/Off Enable Startup Delay (Vin=8.3V, Vout=1.5V, Iout=16A, Cload=0)

Trace 4=Enable In, Trace2=Vout

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.

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=16A to 8A)

Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.

12345678910111213141516

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level

(VIN= 12V, VOUT = 1.8V).

20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

Ambient Temperature (ºC)

Output Current (Amps)

Natural convection

100 LFM

200 LFM

300 LFM

400 LFM

In this graphic data, 10 Amp models perform identically to 16 Amp models with the limitation of 10 Amps output.

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 12 of 17

www.murata-ps.com/support

PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 2.5V)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

On/Off Enable Startup Delay (Vin=8.3V, Vout=2.5V, Iout=16A, Cload=0)

Trace 4=Enable In, Trace2=Vout

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.

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=16A to 8A)

Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 13 of 17

www.murata-ps.com/support

PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 3.3V)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 14V

OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level

(VIN= 12V, VOUT = 3.3V).

20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

Ambient Temperature (ºC)

Output Current (Amps)

Natural convection

100 LFM

200 LFM

300 LFM

400 LFM

On/Off Enable Startup Delay (Vin=8.3V, Vout=3.3V, Iout=16A, Cload=0)

Trace 4=Enable In, Trace2=Vout

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.

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=16A to 8A)

Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 14 of 17

www.murata-ps.com/support

PERFORMANCE DATA AND OSCILLOGRAMS – OKY2-T/16-D12

OKY2-T/16-D12 Efﬁ ciency vs. Line Voltage and Load Current @ +25°C

(VOUT = 5V)

12345678910111213141516

Load Curre nt (Amps)

Efﬁciency (%)

VIN = 8.3V

VIN = 12V

VIN = 13.2V

OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level

(VIN= 12V, VOUT = 5V)

20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

Ambient Temperature (ºC)

Output Current (Amps)

Natural convection

100 LFM

200 LFM

300 LFM

400 LFM

On/Off Enable Startup Delay (Vin=8.3V, Vout=5V, Iout=16A, Cload=0)

Trace 4=Enable In, Trace2=Vout

Step Load Transient Response (Vin=12V, Vout=5V, Cload=0, Iout=8A to 16A)

Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.

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=16A to 8A)

Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 15 of 17

www.murata-ps.com/support

TAPE & REEL IMFORMATION

THIRD ANGLE PROJECTION

1.591

40.40

24.00

.945

18.19

(P/U)

.716

2.00

(P/U)

.079

2.00

4.00

(CORE)

101.6

.50

.27

.360

9.14

ROUND

HOLES

OBLONG

HOLES

KEY IN

POCKET

1.732

44.00

.157

4.00

.069

1.75

REEL INFORMATION

(250 UNITS PER REEL)

PICK & PLACE PICKUP (P/U)

FEED (UNWIND)

DIRECTION -------

13.00

330.2

.512

13.00

PIN #1 THIS

CORNER

(FARSIDE)

PICKUP

NOZZLE

LOCATION

(3-6mm)

1.30

REF

.53

REF

1.73

REF

44.0

TOP COVER TAPE

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 16 of 17

www.murata-ps.com/support

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:

The label contains three rows of information:

First row – Murata Power Solutions logo

Second row – Model number product code (see table)

Third row – Manufacturing date code and revision level

The manufacturing date code is four characters:

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

Figure 4. Label Artwork Layout

Y01110 Product code

Mfg.

date

code

Revision levelYMDX Rev.

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

Mean Time Before Failure (MTBF) Table

These ﬁ gures 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, partic-

ularly telecom. The United States MIL-HDBK method is for military and industrial applications. Please refer to a qualiﬁ ed 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

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.

OKY-T/10 & T/16-D12 Series

Programmable DOSA-SMT 10/16-Amp DC/DC Converters

MDC_OKY_T10T16.D12.A08 Page 17 of 17

www.murata-ps.com/support

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. Speciﬁ cations are subject to change without

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 U.S.A.

ISO 9001 and 14001 REGISTERED

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/

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Murata:

OKY-T/10-D12P-C OKY-T/10-D12N-C OKY2-T/10-D12P-C OKY2-T/10-D12N-C OKY-T/16-D12P-C OKY-T/16-

D12N-C OKY2-T/16-D12P-C OKY2-T/16-D12N-C OKY2-T/10-W5P-C OKY2-T/16-W5P-C OKY-T/10-W5P-C OKY-

T/16-W5P-C