OKY2-T/60-W12NA-C_技术文档

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

PRODUCT OVERVIEW

switching topology, this high power

The OKY2-T/60-W12 series are

miniature non-isolated Point-of-Load (PoL)

DC-DC power converters for embedded

applications. The tiny form factor measures

only 1.3 x 0.9 x 0.38 inches (33.0 x 22.9 x

9.6 mm). Applications include powering

CPU’s, datacom/telecom systems,

Distributed Bus Architectures (DBA),

programmable logic and mixed voltage

systems.

conversion efficient PoL module features

programmable output voltage, On/Off control,

Power Good signal, sequence/tracking,

parallel operation and optional SYNC/CLKOUT

function.

These converters also include under

voltage lock out (UVLO), output short circuit

protection, over-current, over-temperature,

over-voltage and under-voltage protection.

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.

Typical unit

FEATURES



4.5-14Vdc input voltage range

Programmable output voltage from0.7-2.0Vdc

Up to 60 Amps of output current

The converters have a wide input voltage

range of 4.5 to 14Vdc and a maximum

output current of 60 Amps. Based on a fixed

frequency synchronous buck converter

Drives 20,000μF tantalum capacitive loads

Industry Standard surface mount package

1.3 x 0.9 x 0.38 inches (33.0 x 22.9 x 9.6 mm)

High efficiency of87.5%, (typical)

Outstanding thermal deratingperformance

Over temperature and over currentprotection

Over voltage and under voltageprotection

On/Off control (Positive or Negative logic)

Power Good signal

Sequence/Tracking function

Parallel operation up to 3 modules

Optional SYNC/CLKOUT function

RoHS-6 hazardous substance compliance

+Vin

+Vout

• Switching

• Filters

F1

On/Off

Control

+Sense

-Sense

Controller

• Current Sense

External

Open=On

DC

-Trim

Closed=Off

Power

Source

(Positive ꢀ

Reference and

Error Amplifier

On/Off)

+Trim

Common

CLKOUT

SYNC

Sequence/ Tracking

Power Good

Figure 1. Connection Diagram

Typical topology is shown. Murata Power Solutions recommends an external fuse.

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MDC_OKY2-T/60-W12.A01 Page 1 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE



Output

Input

Package

Efficiency On/Off

Regulation (max.)

Line (%) Load (%)

Model Number

SYNC

Vout

Iout

Power R/N (mVp-p)

(Amps,max) (Watts)

Vin nom

(Vdc)

Range Iin, no load

(Vdc)

Iin, full load

(Amps)

(%)

87.5

Logic

(Vdc)

Max.

(mA)

inches (mm)

1.30x0.9x0.38

(33.0x22.9x9.6)

OKY2-T/60-W12PA-C

OKY2-T/60-W12P-C

OKY2-T/60-W12NA-C

OKY2-T/60-W12N-C

0.7-2.0

60

120

50

±0.25 ±0.25

12

4.5-14

160

11.6

Pos.

Neg.

Yes

No

1.30x0.9x0.38

(33.0x22.9x9.6)

50

4.5-14

160

1.30x0.9x0.38

(33.0x22.9x9.6)

Yes

No

1.30x0.9x0.38

(33.0x22.9x9.6)

1. Please refer to the Part Number Structure for additional ordering information and options.

2. All specifications are at nominal line voltage, Vout=nominal (2.0V) and full load, +25°C unless

otherwise noted. Output capacitors are 100 uF*1 ceramic and 470uF*10 tantalum (Panasonic

POSCAP). Input cap is 22 uF*3 ceramic and 560uF*1 electrolytic (Panasonic OS- CON). See

detailed specifications. I/O caps are necessary for our test equipment.

3. Use adequate ground plane and copper thickness adjacent to the converter.

PART NUMBER STRUCTURE

OKY2 - T / 60 - W12 N A - C

RoHS Hazardous Materialscompliance

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

Okami Series

Non-isolated PoL

Y = Surface mount package

2 = Sequence/Tracking

A = SYNC/CLKOUT(optional)

T = Trimmable Output

Voltage Range: (0.7-2.0Vdc)

On/Off Control Logic

N = Negative

P = Positive

Maximum RatedOutput

Current inAmps

Input VoltageRange:

W12 = 4.5-14Vdc (12Vdcnominal)

Product Marking

Model Number

OKY2-T/60-W12PA-C

OKY2-T/60-W12P-C

OKY2-T/60-W12NA-C

OKY2-T/60-W12N-C

Product Code

Y21160

Rev Code

2

1

2

1

Because of the small size of these products, the product marking

contains a character-reduced code to indicate the model number and

manufacturing date code. Not all items on the marking are always

used. Please note that the marking differs from the product

photograph. Here is the layout of the Marking.

Y21160

Y20160

Codes

Layout

The manufacturing date code is four characters:

First character - Manufacturing information

Second character - Last digit of manufacturing year, example 2011

Third character - Month code (1 through 9 and O through D)

Fourth character - Day code (1 through 9 = 1 to 9, 10=O and

11 through 31 = A through Z)

①

Rev code

①

②③

②③④⑤⑥⑦ Product code

⑧⑨⑩⑪ Manufacturing date code

④⑤⑥⑦

⑧⑨⑩⑪

The marking contains three rows of information:

First and second row – Rev code and product code

Third row - Manufacturing date code

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MDC_OKY2-T/60-W12.A01 Page 2 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

FUNCTIONAL SPECIFICATIONS

ABSOLUTEMAXIMUMRATINGS

Input Voltage, Continuous

ON/OFF Pin

SEQ Pin

SYNC Pin

Minimum

-0.3

Typical/Nominal

Maximum

Units

Vdc

V

Conditions

14

3

Power on, referred to-Vin

Current-limited, no damage,short-circuit

protected

6

V

Source ONLY

SHARE/PGOOD/CLKOUT/

±Trim Pins

Output Current

0

60

A

StorageTemperatureRange

Vin = Zero (no power)

-55

125

°C

Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other thanthose

listed in the Performance/Functional Specifications Table is not implied or recommended.

Conditions

INPUT

OperatingVoltageRange

Start-up threshold

Undervoltage shutdown

Overvoltage shutdown

Internal Filter Type

4.5

12

4.3

4.0

Vo*120%

Capacitive

14

Vdc

Rising input voltage

Note 15

Inputcurrent

Full Load Conditions

Low Line

Vin = nominal

Vin = minimum

11.6

30

A

NoLoadCurrent

Iout = minimum, unit = ON

160

1

mA

Shut-Down Mode InputCurrent

Tracking/Sequencing

Operating Voltage Range

SlewRate(Power-Up)

SlewRate(Power-Down)

Trackingaccuracy,risinginput

Trackingaccuracy,fallinginput

3

2

1

V

V/ms

Vout = 100mV of Sequence In (TYP)

Vout = 200mV of Sequence In (TYP)

GENERAL and SAFETY

Efficiency

Vin =5V, Vout= 2V, full load

Vin=5V,Vout=2V,Io=50A

87.5

90

%

Certified to UL-60950-1, CSA-C22.2 No. 60950-1,

IEC/EN60950-1, 2nd edition(pending)

Safety

Per Telcordia SR-332 Issue 2, Method 1, Class 3,

Ground Benign, Tambient =+25°C

Per Telcordia SR-332 Issue 3, Method 1, Class 3,

Ground Benign, Tambient =+25°C

Calculated MTBF (Note 4a)

Calculated MTBF (Note 4b)

322,334

Hours

1,643,147

DYNAMIC CHARACTERISTICS

Fixed Switching Frequency

Startup Time

310

4.5

kHz

mS

Vout=nominal (Vin On to 90% of Vo)

Vout=nominal (Remote On to 90% of Vo)

Startup Time

2.5

Dynamic Load

Response

DynamicLoadPeakDeviation

(25-75% load step, di/dt)

same as above

A/μSec

Voset

3.0%

FEATURES

RemoteOn/Off Control (Note 5)

“N” suffix:

NegativeLogic,ONstate

NegativeLogic,OFFstate

Control Current

ON = Open pin or -0.3V to +0.6V. max.

OFF = +3.0Vmin. to +Vin max.

Open collector/drain

-0.3

3.0

0.6

Vin max

3.3

Vdc

mA

“P” suffix:

PositiveLogic,ONstate

PositiveLogic,OFFstate

Control Current

ON = +3.0Vmin. to +Vin max.

OFF =Open or -0.3V to +0.6V.max.

Open collector/drain

3.0

-0.3

Vin max

0.6

3.3

V

mA

Power-Good Output (Pulled up to 5.4Vreg(TYP) internally)

PGood TRUE (HI)

PGood FALSE (LO)

(Vset –13%) < Vout < (Vset +13%)

Out of above range

OPTIONS (OKY2-T/60-W12NA-C & OKY2-T/60-W12PA-C only)

SYNC

InputVoltageRange

Signal Low

Signal High

V

-0.3

3.0

1.0

Vin max or to 5.8

InputFrequencyRange

InputWaveForm(Note18)

CLKOUT

280 to 340

Square Plus Waveform (Duty cycle 20-80%)

kHz

Output voltagerange

Waveform

Duty cycle

-0.3

Vin max or to 5.8

V

Square Plus Waveform

50

%

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MDC_OKY2-T/60-W12.A01 Page 3 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

FUNCTIONAL SPECIFICATIONS (CONT.)

OUTPUT

Total Output Power

Voltage

OutputVoltageRange

Minimum Loading

See Derating

Note 13

0

120

2

W

0.7

Vdc

None

Accuracy (50% load, untrimmed)

Overvoltage Protection

Undervoltage Protection

Current

2.0% of Vnominal

>113%Vset(Hiccup),>120%Vset(Latch)

<87%Vset(Hiccup)

Vdc

Note 16

OutputCurrentRange

CurrentLimitInception

Short Circuit

0

60

A

98% of Vnom., afterwarmup

100

Short Circuit Duration

(remove short for recovery)

Shortcircuitprotectionmethod

Output shorted to ground, nodamage

Continuous

Current limiting

Prebias Start-up

Converter will start up if the external output voltage is less than Vnominal.

Regulation

Line Regulation

Vin = min. to max.,Vout = nom., Iout = nom.

Note 8

0.25

50

% of Vout

mV pk-pk

μF

Ripple and Noise (20MHz bandwidth)

4800

280

20000

90

Maximum Capacitive Loading (Note 14)

ParallelandSYNCoperation

Maximum parallel units (withSYNC)

Maximum parallel units (w/o SYNC)

LoadShareAccuracy

External input frequency range (Note 18)

MECHANICAL

Outline Dimensions

(Please refer to outline drawing)

Weight

Cap-ESR>0.01 Ohms

3

2

Units

%

Io=Iomax

LxWxH

340

kHz

1.30x0.9x0.38

33.0x22.9x9.6

0.39

Inches

mm

Ounces

Grams

11.5

ENVIRONMENTAL

Operating Ambient TemperatureRange

StorageTemperature

Thermal Protection/Shutdown

Relative Humidity

With Derating (Note 9)

Vin = Zero (no power)

Measured in center

-40

-55

85

125

°C

135

To 85%/+85°C, non-condensing

RoHS-6

RoHS rating

Specification Notes

(1) Specifications are typical at +25°C, Vin=nominal (+12V.), Vout=nominal (+2V), 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 100

uF*1 ceramic and 470uF*10 tantalum output capacitors and a 22 uF*3 ceramic and 560uF*1

electrolytic 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 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 uF ceramic, Cbus=1000 uF electrolytic, Lbus=1 uH.

(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) Issue 2, Method 1, Case

3, Ground Benign conditions, Tpcboard = +25°C, full output load, natural air convection.

(4b) Mean Time Before Failure is calculated using the Telcordia (Belcore) Issue 3, Method 1, Case

3, Ground Benign conditions, Tpcboard = +25°C, full output load, natural air convection.

(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 do not exceed +Vin

(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 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 under voltage shutdown voltage at

all times. Otherwise, you risk having the converter turn off. The under voltage shutdown is not

latching and will attempt to recover when the input is brought back into normal operating range.

(16) The outputs are not intended to sink appreciable reverse current.

(17) “Hiccup” over current operation repeatedly attempts to restart the converter with a brief, full-

current output If the over current condition still exists the restart current will be removed and

then try again. This short current pulse prevents overheating and damaging the converter. Once

the fault is removed, the converter immediately recovers normal operation.

(18) The switching frequency will lock to an external frequency (square pulse waveform), typically the

CLKOUT signal from another converter or external clock. The internal oscillator synchronizes

with the leading edge of the input signal.

(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the

selected setting.

(7) “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.

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MDC_OKY2-T/60-W12.A01 Page 4 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

PERFORMANCE DATA AND OSCILLOGRAMS

Efficiency vs. Line Voltage and Load Current @ +25°C. (Vout = 0.7V)

Maximum Current Temperature Derating at Sea Level (Vin=12V, Vout=0.7V)

70

100

95

60

50

40

30

20

10

0

90

0.2m/s(40LFM)

0.5m/s(100LFM)

1m/s(200LFM)

1.5m/s(300LFM)

2m/s(400LFM)

85

80

Vin=4.5V

Vin=12V

Vin=14V

75

70

65

0

10

20

30

40

50

60

Load Current [Amps]

25

35

45

55

65

75

85

95

Ta [degC]

On/Off Enable Delay (Vin=12V, Vout=0.7V, Iout=60A, Cload=4800uF)

Trace1=Enable, Trace2=Vout

Output Ripple and Noise

(Vin=12V, Vout=0.7V, Iout=60A, Cload=4800uF, ScopeBW=20MHz)

Step Load Transient Response (Vin=12V, Vout=0.7V, Cload=4800uF,

Iout=15A to 45A) Trace 2=Vout, 50 mV/div, Trace 4=Iout, 20A/div.

Step Load Transient Response (Vin=12V, Vout=0.7V, Cload=4800uF,

Iout=45A to 15A) Trace 2=Vout, 50 mV/div, Trace 4=Iout, 20A/div.

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MDC_OKY2-T/60-W12.A01 Page 5 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

PERFORMANCE DATA AND OSCILLOGRAMS

Efficiency vs. Line Voltage and Load Current @ +25°C. (Vout = 1.2V)

Maximum Current Temperature Derating at Sea Level (Vin=12V, Vout=1.2V)

70

100

95

60

50

40

30

20

10

0

90

0.2m/s(40LFM)

0.5m/s(100LFM)

1m/s(200LFM)

1.5m/s(300LFM)

2m/s(400LFM)

85

80

Vin=4.5V

Vin=12V

Vin=14V

75

70

65

0

10

20

30

40

50

60

Load Current [Amps]

25

35

45

55

65

75

85

95

Ta [degC]

On/Off Enable Delay (Vin=12V, Vout=1.2V, Iout=60A, Cload=4800uF)

Trace1=Enable, Trace2=Vout

Output Ripple and Noise

(Vin=12V, Vout=1.2V, Iout=60A, Cload=4800uF, ScopeBW=20MHz)

Step Load Transient Response (Vin=12V, Vout=1.2V, Cload=4800uF,

Iout=15A to 45A) Trace 2=Vout, 50 mV/div, Trace 4=Iout, 20A/div.

Step Load Transient Response (Vin=12V, Vout=1.2V, Cload=4800uF,

Iout=45A to 15A) Trace 2=Vout, 50 mV/div, Trace 4=Iout, 20A/div.

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MDC_OKY2-T/60-W12.A01 Page 6 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

PERFORMANCE DATA AND OSCILLOGRAMS

Efficiency vs. Line Voltage and Load Current @ +25°C. (Vout = 2.0V)

Maximum Current Temperature Derating at Sea Level (Vin=12V, Vout=2.0V)

70

100

95

60

50

40

30

20

10

0

90

0.2m/s(40LFM)

0.5m/s(100LFM)

1m/s(200LFM)

1.5m/s(300LFM)

2m/s(400LFM)

85

Vin=4.5V

Vin=12V

Vin=14V

80

75

70

65

0

10

20

30

40

50

60

25

35

45

55

65

75

85

95

Load Current [Amps]

Ta [degC]

On/Off Enable Delay (Vin=12V, Vout=2.0V, Iout=60A, Cload=4800uF)

Trace1=Enable, Trace2=Vout

Output Ripple and Noise

(Vin=12V, Vout=2.0V, Iout=60A, Cload=4800uF, ScopeBW=20MHz)

Step Load Transient Response (Vin=12V, Vout=2.0V, Cload=4800uF,

Iout=15A to 45A) Trace 2=Vout, 50 mV/div, Trace 4=Iout, 20A/div.

Step Load Transient Response (Vin=12V, Vout=2.0V, Cload=4800uF,

Iout=45A to 15A) Trace 2=Vout, 50 mV/div, Trace 4=Iout, 20A/div.

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MDC_OKY2-T/60-W12.A01 Page 7 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

MECHANICAL SPECIFICATIONS

INPUT/OUTPUT CONNECTIONS

Function

Vin

1

GND

Vout

2

3

Vout

4

GND

Vin

5

6

SEQ

7

PGOOD

ON/OFF

VS-

8

9

10

11

12

13

14

15

16

VS+

+Trim

-Trim

SHARE

CLKOUT*

SYNC*

* CLKOUT and SYNC pins are optional

(include A suffix). Please see the Part

Number Structure on Page 2.

Dimensions are in mm (inches) shown for ref. only.

Tolerances (unless otherwise specified):

.XX 0.02 (0.5)

.XXX 0.010 (0.25)

Angles 2˚

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MDC_OKY2-T/60-W12.A01 Page 8 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

TAPE AND REEL INFORMATION

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MDC_OKY2-T/60-W12.A01 Page 9 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

TAPE SPECIFICATIONS

Dimensions are in mm (inches) shown for ref. only.

Tolerances (unless otherwise specified):

.XX 0.02 (0.5)

.XXX 0.010 (0.25)

Angles 2˚

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MDC_OKY2-T/60-W12.A01 Page 10 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

TECHNICAL NOTES

Input Fusing

Recommended Output Filtering

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. For greatest safety, we recommend a fast blow fuse installed in

the ungrounded input supply line.

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.

The converter will achieve its rated output ripple and noise with additional

external capacitor. 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) and tantalum capacitors

such as Panasonic POSCAP. Initial values of 100 uF*1 ceramic type and

470uF*10 tantalum type 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 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

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.

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.

In the figure below, 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.

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 accuracy 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.

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.

Measuring Output Ripple and Noise (PARD)

Minimum Output Loading Requirements

Recommended Input Filtering

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.

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 and a

electrolytic type such as Panasonic OS-CON series. Initial suggested

capacitor values are 22 uF*3 ceramic type and 560uF*1 electrolytic type,

rated at twice the expected maximum input voltage. Make sure that the

input terminals do not go below the under voltage shutdown voltage at all

times. More input bulk capacitance may be added in parallel (either

electrolytic or tantalum) if needed.

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.

CAUTION: If you operate too close to the thermal limits, the converter may

shut down suddenly without warning. Be sure to thoroughly you’re your

application to avoid unplanned thermal shutdown.

www.murata-ps.com/support

MDC_OKY2-T/60-W12.A01 Page 11 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

Temperature Derating Curves

converter could operate sink mode in a very short time of switching cycles,

to avoid high negative voltage ringing until the UV condition removed.)

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. Murata 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.

Output Voltage Sequencing

The OKY2 modules include a sequencing feature that enables users to

implement various types of output voltage sequencing in their applications.

This is accomplished via an additional sequencing pin. When not using the

sequencing feature, either tie the sequence pin to Vin or leave it

unconnected. When an analog voltage is applied to the sequence pin, the

output voltage tracks this voltage until the output reaches the set-point

voltage. The final value of the sequence voltage must be set higher than

the setpoint voltage of the module. The output voltage follows the voltage

on the sequence pin on a one-to-one volt basis. By connecting multiple

modules together, multiple modules can track their output voltages to the

voltage applied on the sequence pin. For proper voltage sequencing, fi rst,

input voltage is applied to the module. The On/Off pin of the module is left

unconnected (or tied to GND for negative logic modules or tied to Vin for

positive logic modules) so that the module is ON by default. After applying

input voltage to the module, a minimum 10msec delay is required before

applying voltage on the sequence pin. During this time, a voltage of 100mV

CAUTION: 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 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.

(

20 mV) is maintained on the sequence pin. This delay gives the module

enough time to complete its internal power-up soft-start cycle. During the

delay time, the sequence pin should be held close to ground (nominally

100mV 20 mV). This is required to keep the internal op-amp out of

saturation thus preventing output overshoot during the start of the

sequencing ramp.

Remote On/Off Control

Output Short Circuit Condition

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 logic models are enabled when the On/Off pin is left open or is

pulled high to +Vin with respect to -Vin. An internal bias current causes

the open pin to rise to +Vin. Positive-polarity devices are disabled when

the On/Off is grounded or brought to within a low voltage (see

Specifications) with respect to -Vin.

Negative logic devices are on (enabled) when the On/Off is 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 with respect to -Vin (see

specifications).

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

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.

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.

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

condition is removed.

Output Over Voltage Protection

OV protection is active upon converter (ON).An OV condition

(>120%*Voset) would latch off permanently. The ON/OFF pin and PGOOD

pin are also latched low at this OV event. The latch condition can be reset

only by recycling Vin.

There is another non-latch OV protection (>113%*Voset). At the condition

the output over 113% OV, the converter will operate “sink” mode only until

the output drops below 87%*Voset. After the output drops below 87%, the

converter will operate “sink-source” mode (normal operation) again.

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 noise objectives. Excess external

capacitance may cause regulation problems, degraded transient response

and possible oscillation or instability.

Synchronization (OKY2-T/60-W12NA-C & OKY2-T/60-W12PA-C only)

These converters can be synchronized using an external signal. Details of

the SYNC signal are provided in the Performance and Functional Specifi

cations table. If the synchronization function is not being used, leave the

SYNC pin floating. When synchronization function is used, output ripple

may increase on some operating conditions. Please check the proper

operation of this device with the peripheral circuits on your system.

Output Under Voltage Protection

The under voltage protection is NOT enabled until the end of soft-start

condition. In a UV event, if the output drops below 87%*Voset due to some

reason for example OV, OC, OT and dynamic load response, the converter

will operate almost “source” mode only until UV condition is removed. (The

www.murata-ps.com/support

MDC_OKY2-T/60-W12.A01 Page 12 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

Output Voltage Adjustment

CLKOUT (OKY2-T/60-W12NA-C & OKY2-T/60-W12PA-C only)

Square wave with switching frequency is appeared CLKOUT pin. It is

possible to synchronize other converters by connecting CLKOUT pin to

SYNC pin of other converter. Details of the CLKOUT signal are provided in

the Performance and Functional Specifications table. If the CLKOUT

function is not being used, leave the CLKOUT pin floating.

The output voltage may be adjusted over a limited range by connecting an

external trim resistor (Rtrim) between the +Trim pin and –Trim pin. The

Rtrim resistor must be a 1/10 Watt precision metal film type, 0.5%

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.

In the table below, 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 pin.

Soldering Guidelines

Murata 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.

Output Voltage

Calculated Rtrim (kΩ)

Reflow Solder Operations for surface-mount products (SMT)

For Sn/Ag/Cu based solders:

2.0 V.

1.8 V.

1.5 V.

1.2 V.

1.0 V.

0.70 V.

10.80

12.70

17.50

28.00

46.60

(open)

Preheat Temperature

Time over Liquidus

Less than 1°C per second

45 to 75 seconds

Maximum Peak Temperature 260°C

Cooling Rate

Less than 3°C per second

For Sn/Pb basedsolders:

Preheat Temperature

Time over Liquidus

Less than 1°C per second

60 to 75 seconds

Maximum Peak Temperature 235°C

Resistor Trim Equation, OKY2-T/60-W12 models

Cooling Rate

Less than 3°C per second

(kꢀ) =

Vout

0.7

Recommended Lead-free Solder Reflow Profile

www.murata-ps.com/support

MDC_OKY2-T/60-W12.A01 Page 13 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

PARALLEL OPERATION

NOTES:

.

The OKY2-T/60-W12N-C and OKY2-T/60-W12P-C can operate in parallel (up to 2 converters) without the SYNC function, by connecting each

ISHARE, SEQ and ON/OFF terminals.

.

The OKY2-T/60-W12NA-C and OKY2-T/60-W12PA-C can operate in parallel (up to 3 converters) with the SYNC function, by connecting each

ISHARE, SEQ, ON/OFF, SYNC and CLKOUT terminals.

(1) When using parallel operation, the temperature of some parts may increase in one of the products because there are some differences in the

operating conditions between the first and second module. For this reason, please check the temperature of the products in your application.

(2) When using parallel operation, please set no more than 80% of the sum of individual products because the current of each product may not be equal.

(3) It is necessary to install Cin and Cout for each module.

(4) To avoid OC, OV and UV protection malfunction, please set same values of Vout of each module and place each modules isometric alignment

for Vin and Load. And it is recommended that the load may be started after PGOOD signal “High” because of same reason.

(5) Parallel operation can be available among same parts N.O. only.

(6) There is no redundancy function.

Below is the recommended schematic diagram for parallel operation without the SYNC function:

(OKY2-T/60-W12N-C and OKY2-T/60-W12P-C only)

NOTE: Please shield well from any noise, especially SHARE, SEQ, VS+, VS- and ON/OFF lines to avoid any unexpected interference during operation.

www.murata-ps.com/support

MDC_OKY2-T/60-W12.A01 Page 14 of 15

OKY2-T/60-W12 Series

Programmable Output 60-Amp SMT PoL

Below is the recommended schematic diagram for parallel operation with the SYNC function:

(OKY2-T/60-W12NA-C and OKY2-T/60-W12PA-C only)

(1) Please shield well from any noise, especially SHARE, SEQ, VS+, VS- and ON/OFF lines, to avoid any unexpected interference during operation.

(2) Be careful for drawing of SYNC-CLKOUT line, because CLKOUT lines have large amplitude of square wave form.

SYNC

VS-

Cout

for 1^stModule

1^stModule

GND

Vout

Vin

Cin

for 1^stModule

ON/OFF

VS+

SEQ

+Trim

PGOOD

Share

-Trim

CLKOUT

Rtrim

SYNC

2^ndModule

VS-

GND

Vout

Cin

for 2^ndModule

Vin

RL

R1

Cout

for 2^ndModule

ON/OFF

VS+

SEQ

+Trim

Vin

PGOOD

Rtrim

Share CLKOUT -Trim

SYNC

3^rdModule

+Trim

Share

PGOOD

-Trim

SEQ

VS+

ON/OFF

Vout

Cout

for 3^rdModule

Vin

GND

Cin

CLKOUT VS-

for 3^rdModule

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansfield, 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/

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 changewithout

notice.

www.murata-ps.com/support

MDC_OKY2-T/60-W12.A01 Page 15 of 15


型号：	OKY2-T/60-W12NA-C
厂家：	muRata
描述：	DC-DC Regulated Power Supply Module,
文件：	总15页 (文件大小：687K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

OKY2-T/60-W12NA-C [MURATA]

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