OKY-T/5-W5N-C [MURATA]
DC-DC Regulated Power Supply Module,;
| 型号： | OKY-T/5-W5N-C |
| 厂家： | 
muRata |
| 描述： | DC-DC Regulated Power Supply Module, |
| 文件： | 总19页 (文件大小：898K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OKY T/3, T/5-W5 Series
s
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
PRODUCT OVERVIEW
The OKY-T/3 and -T/5 series are miniature non-
isolated Point-of-Load (POL) switch mode 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
frequency synchronous buck converter switching
topology, the high power conversion efficient Point
of Load (POL) module features programmable
output voltage and On/Off control. These converters
also include under voltage lock out (UVLO), output
short circuit protection, over-current and over
include powering CPU’s, datacom/telecom systems, temperature protections.
programmable logic and mixed voltage systems.
The wide input range is 2.4 to 5.5 Volts DC. Two
maximum output currents are offered, 3 Amps (T/3
models) or 5 Amps (T/5 models). Based on fixed-
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
■ Non-isolated SMT POL DC/DC power module
■ 2.4-5.5Vdc input voltage range
■ Programmable output voltage from 0.7525-3.63Vdc
■ 3 Amp (T/3) or 5 Amp (T/5) output current models
■ Drives 1000 μF ceramic capacitive loads
■ High power conversion efficiency at 96%
■ Outstanding thermal derating performance
■ Over temperature and over current protection
■ On/Off control
Contents
Page
Description, Connection Diagram, Photograph
Ordering Guide, Model Numbering, Product Label
Mechanical Specifications, Input/Output Pinout
Detailed Electrical Specifications
Output Voltage Adjustment, Soldering Guidelines
Technical Notes
1
2
3
4
5
6
OKY-T/3-W5 Performance Data and Oscillograms
OKY-T/5-W5 Performance Data and Oscillograms
Tape and Reel Information
9
13
19
■ UL/EN/IEC 60950-1 safety
■ Industry-standard (DOSA) surface-mount package
■ RoHS-6 hazardous substance compliance
Connection Diagram
+Vin
+Vout
tꢀ4XJUDIJOH
tꢀ'JMUFST
F1
On/Off
Control
Controller
tꢀ$VSSFOUꢀ4FOTF
External
DC
Trim
Power
Source
Reference and
Error Amplifier
Open = On
Closed = Off
(Positive
On/Off)
Common
Common
Figure 1. OKY-T/3, -T/5
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_OKY-T/3,T/5-W5 Series.A12 Page 1 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
Performance Specifications Summaryand Ordering Guide
ORDERING GUIDE
Output
R/N (mVp-p)➄ Regulation (Max.)➂
Input
Package
Efficiency
IOUT
IIN,
IIN,
VIN Nom. Range no load full load
(Volts) (Volts) (mA) (Amps) Min.
VOUT
(Amps Power
max) (Watts)
Root Model ➁
(Volts)
Max.
Line
Load
Typ.
Case C72 ➀
Pinout
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
OKY-T/3-W5N-C 0.7525-3.63
OKY-T/3-W5P-C 0.7525-3.63
OKY-T/5-W5N-C 0.7525-3.63
3
3
5
5
9.9
9.9
20
0.2%
1.5%
5
5
5
5
2.4-5.5
2.4-5.5
2.4-5.5
2.4-5.5
45
45
35
35
2.1
2.1
3.5
3.5
92% 94.4%
92% 94.4%
P78
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
20
20
20
0.2%
0.2%
0.2%
1.5%
1%
P78
P78
P78
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
16.5
16.5
92%
92%
96%
96%
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
OKY-T/5-W5P-C 0.7525-3.63
1%
➀ Dimensions are in inches (mm).
Vin must be 0.5V or higher than Vout.
Ripple and Noise is shown at Vout=1V.
➁ These are partial model numbers. Please refer to the part number structure for complete ordering part numbers.
➂
All specifications are at nominal line voltage, Vout=nominal (3.3V) and full load, +25 ˚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 - T / 3 - W5 N - C
Okami Non-isolated PoL
RoHS Hazardous
Substance Compliance
C = RoHS-6 (does not claim EU RoHS exemption
7b–lead in solder)
Surface Mount
On/Off Polarity
P = Positive Polarity
N = Negative Polarity
Trimmable Output
Voltage Range
0.75-3.63V
Note: Some model number combinations
may not be available. Contact Murata
Power Solutions for availability.
Input Voltage Range
2.4-5.5V
Maximum Rated Output
Current in Amps
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 dif-
fers from the product photograph on page 1. Here is the layout of the label:
Model Number
Product Code
OKY-T/3-W5N-C
OKY-T/3-W5P-C
OKY-T/5-W5N-C
OKY-T/5-W5P-C
Y00003
Y01003
Y00005
Y01005
Y01003
Product code
Revision level
Mfg.
date
code
The manufacturing date code is four characters:
YMDX Rev.
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)
Figure 2. Label Artwork Layout
The label contains three rows of information:
Fourth character – Manufacturing information
First row – Murata Power Solutions logo
Second row – Model number product code (see table)
Third row – Manufacturing date code and revision level
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 2 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
MECHANICAL SPECIFICATIONS
TOP VIEW
PIN #1 THIS
CORNER (FARSIDE)
11.9
0.47
ISOMETRIC
VIEW
PIN #1
10.67
0.420
REF
5.64
0.222
REF
NOZZLE
PICKUP
POINT
INPUT/OUTPUT CONNECTIONS
OKY-T/3, -T/5
20.8
0.82
Pin
1
2
Function
On/Off Control*
+VIN
SIDE VIEW
END VIEW
3
4
5
Ground (Common)
Trim
7.0
0.28
+VOUT
*The Remote On/Off can be provided with
either positive (P suffix) or negative (N
suffix) polarity
MTG PLANE
1.59
0.063
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
BOTTOM VIEW
1.5
0.06
2.29
0.090
TYP
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 1˚
1.59
0.063
TYP
3
4
5
Components are shown for reference only.
8.63
0.340
1.8
0.07
[20.8] 0.82 REF
1
[2.41] 0.095 MIN
[2.79] 0.110 MAX
[3.05] 0.120 MIN
[3.43] 0.135 MAX
2
0.25
0.010
4.57
0.180
[11.9]
0.47
REF
8.63
0.340
[8.63] 0.340
12.69
0.500
[4.57]
0.180
[1.8]
0.070
REF
17.52
0.690
[1.52]
0.06
[8.63]
0.340
[1.52]
0.060
REF
[12.69]
0.500
MATERIAL:
SMT PINS: COPPER ALLOY
[17.52]
0.690
FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
RECOMMENDED PAD LAYOUT
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 3 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
Performance and Functional Specifications
See Note 1
Input
Environmental
Input Voltage Range
Isolation
See Ordering Guide and Note 7.
Calculated MTBF
Telecordia method (4a)
OKY-T/3-W5N-C: 10,961,200 hours
OKY-T/3-W5P-C: 10,830,600 hours
OKY-T/5-W5N-C: 9,893,917 hours
Not isolated
2.05 V
Start-Up Voltage
Undervoltage Shutdown (see Note 15)
Overvoltage Shutdown
1.90 V
OKY-T/5-W5P-C: 9,765,731 hours
None
Calculated MTBF
MIL-HDBK-217N2 method (4b)
OKY-T/3-W5N-C: 8,398,873 hours
OKY-T/3-W5P-C: 8,228,758 hours
OKY-T/5-W5N-C: 8,338,304 hours
OKY-T/5-W5P-C: 8,170,610 hours
Reflected (Back) Ripple Current (Note 2) 20 mA pk-pk
Internal Input Filter Type
Capacitive
Recommended External Fuse
Reverse Polarity Protection
6A
N/A. See fuse information.
Operating Temperature Range (Ambient, vertical mount)
See derating curves
-40 to +85 ˚C. with derating (Note 9)
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
Low Line (Vin=Vmin)
See Ordering Guide
0.4 A2Sec.
5 mA
60 mA
2.66 A. (OKY-T/3-W5)
4.41 A. (OKY-T/5-W5)
Operating PC Board Temperature
Storage Temperature Range
Thermal Protection/Shutdown
-40 to +100 ˚Celsius max., no derating (12)
-55 to +125 deg. C.
+130 ˚Celsius
Relative Humidity
to 85%/+85 ˚C., non-condensing
Physical
Remote On/Off Control (Note 5)
Negative Logic (“N” model suffix)
ON = Open pin or ground to +0.4V. max.
OFF = +1.5V min. to +Vin
1 mA max.
ON = Open pin (internally pulled up) or
+7.8Vdc to +Vin max.
Outline Dimensions
Weight
See Mechanical Specifications
0.1 ounces (2.8 grams)
Current
Electromagnetic Interference
Designed to meet FCC part 15, class B,
EN55022 and CISPR22 class B conducted
and radiated (may need external filter)
Positive Logic (“P” model suffix)
OFF = Ground pin to +0.4V. max.
1 mA max.
Safety
Designed to meet UL/cUL 60950-1, CSA-
C22.2 No. 60950-1, IEC/EN 60950-1
Current
Output
RoHS-6 (does not claim EU RoHS exemption
7b–lead in solder)
Restriction of Hazardous Substances
Output Power
9.9W max. (OKY-T/3), 16.5W max. (OKY-T/5)
See Ordering Guide
Output Voltage Range
MSL Rating
2
Minimum Loading
No minimum load
Absolute Maximum Ratings
Accuracy (50% load, untrimmed)
Voltage Output Range (Note 13)
Overvoltage Protection (Note 16)
Temperature Coefficient
Ripple/Noise (20 MHz bandwidth)
Line/Load Regulation
2 % of Vnominal
Input Voltage (Continuous or transient)
On/Off Control
0 V.to +5.8 Volts max.
0 V. min. to +Vin max.
See Ordering Guide
None
Input Reverse Polarity Protection
Output Current (Note 7)
See Fuse section
0.02% per ꢀC of Vout range
See Ordering Guide and note 8
See Ordering Guide and note 10
See Ordering Guide
Current-limited. Devices can withstand a
sustained short circuit without damage.
The outputs are not intended to accept
appreciable reverse current.
Efficiency
Storage Temperature
Lead Temperature
-55 to +125 ˚C.
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms
Cap-ESR >0.01 Ohms
See soldering specifications
1,000 ꢁF
ꢁ
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.
3,000
F
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up) 5 Amps
Short Circuit Mode
Short Circuit Current Output
Protection Method
2 A
Specification Notes:
Hiccup autorecovery upon overload
removal. (Note 17)
Continuous, no damage
(output shorted to ground)
Converter will start up if the external
(1) Specifications are typical at +25 ꢀC, Vin=nominal (+5V.), Vout=nominal (+3.3V), full load, external caps and
natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced
airflow.
Short Circuit Duration
Prebias Startup
All models are tested and specified with external 1 ꢁF paralleled with 10ꢁF 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.
output voltage is less than Vnominal.
Dynamic Characteristics
(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.
Dynamic Load Response
(50-100-50% load step, di/dt=2.5A/ Sec)
90ꢁSec max. to within 2% of final value
ꢁ
(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.
Start-Up Time
(Vin on or On/Off to Vout regulated)
8 mSec for Vout=nominal (Vin On)
6 mSec for Vout=nominal (Remote On/Off)
(4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed
conditions, Tpcboard=+25 ˚C, full output load, natural air convection.
Switching Frequency
300 KHz
(4b) Mean Time Before Failure is calculated using the MIL-HDBK-217N2 method, ground benign, +25ºC., full
output load, natural convection.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 4 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
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 do not
exceed +Vin.
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
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected
setting.
(7) For W5 models, the Input Voltage must exceed the Output Voltage at all times by 0.5 Volts or greater.
engineers.
(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.
Reflow Solder Operations for surface-mount products (SMT)
For Sn/Ag/Cu based solders:
(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.
Preheat Temperature
Time over Liquidus
Less than 1 ºC. per second
45 to 75 seconds
Maximum Peak Temperature
Cooling Rate
260 ºC.
(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.
Less than 3 ºC. per second
For Sn/Pb based solders:
Preheat Temperature
Time over Liquidus
Less than 1 ºC. per second
60 to 75 seconds
(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.
Maximum Peak Temperature
Cooling Rate
235 ºC.
(16) The outputs are 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.
Less than 3 ºC. per second
Recommended Lead-free Solder Reflow Profile
Peak Temp.
235-260° C
Output Voltage Adustment
250
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/oC. or better. Mount the
resistor close to the converter with very short leads or use a surface mount
trim resistor.
200
Reflow Zone
150
100
50
Soaking Zone
120 sec max
time above 217° C
45-75 sec
In the tables 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 capaci-
tors to Trim.
<1.5° C/sec
High trace = normal upper limit
Low trace = normal lower limit
Preheating Zone
240 sec max
0
0
30
60
90
120
150
Time (sec)
180
210
240
270
300
High trace = normal upper limit
Low trace - normal lower limit
OKY-T/3-W5, -T/5-W5
Output Voltage
3.3 V.
Calculated Rtrim (KΩ)
3.160
2.5 V.
6.947
2.0 V.
11.780
1.8 V.
15.004
1.5 V.
23.077
1.2 V.
41.973
1.0 V.
80.021
0.7525 V.
∞ (open)
Resistor Trim Equation, W5 models:
21070
VOUT – 0.7525V
_____________
RTRIM () =
– 5110
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 5 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
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
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.
TECHNCIAL 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, calcu-
lated at the lowest input voltage.
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.
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 opera-
tion at a single input voltage.
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 specifications.
Input Ripple Current and Output Noise
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.
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output compo-
nents, circuits and layout as shown in the figures below. In the figure below,
the Cbus and Lbus components simulate a typical DC voltage bus. Please
note that the values of Cin, Lbus and Cbus will vary according to the specific
converter model.
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.
TO
CURRENT
PROBE
OSCILLOSCOPE
+INPUT
LBUS
+
–
+
VIN
CBUS
CIN
–
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.
-INPUT
C
C
IN = 2 x 100μF, ESR < 700mΩ @ 100kHz
BUS = 1000μF, ESR < 100mΩ @ 100kHz
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.
LBUS = 1μH
Figure 3. Measuring Input Ripple Current
In figure 4, 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.
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.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 6 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
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.
COPPER STRIP
+OUTPUT
-OUTPUT
Output Fusing
RLOAD
SCOPE
C1
C2
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protec-
tion. In the extremely unlikely event of output circuit failure, excessive voltage
could be applied to your circuit. Consider using an appropriate fuse in series
with the output.
COPPER STRIP
Output Current Limiting
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
Current limiting inception is defined as the point at which full power falls below
the rated tolerance. See the Performance/Functional Specifications. Note par-
ticularly that the output current may briefly rise above its rated value in normal
operation as long as the average output power is not exceeded. This enhances
reliability and continued operation of your application. If the output current is
too high, the converter will enter the short circuit condition.
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 4. Measuring Output Ripple and Noise (PARD)
Minimum Output Loading Requirements
All models regulate within specification and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approxi-
mately 98% of nominal output voltage for most models), the magnetically
coupled voltage used to develop primary side voltages will also drop, thereby
shutting down the PWM controller. Following a time-out period, the PWM will
restart, causing the output voltage to begin ramping up to its appropriate value.
If the short-circuit condition persists, another shutdown cycle will initiate. This
rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the
average output current, thereby preventing excessive internal temperatures
and/or component damage. A short circuit can be tolerated indefinitely.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
hysteresis to prevent rapid on/off cycling.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condi-
tion is removed.
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.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
Please refer to the Connection Diagram on page 1 for On/Off connections.
Positive polarity models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Positive-polarity devices are disabled
when the On/Off is grounded or brought to within a low voltage (see Specifica-
tions) with respect to –Vin.
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.
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.
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.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 7 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
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.
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 oscilla-
tion or instability.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 8 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.2V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.2V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
90
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
80
Natural convection
70
VIN = 5.5V
VIN = 5V
60
VIN = 2.4V
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
3
3.5
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=1.2V, Iout=3A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=1.2V, Iout=3A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 9 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.5V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.5V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
100
80
Natural convection
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
40
20
0
0
0.5
1
1.5
2
2.5
3
3.5
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Load Current (Amps)
Ambient Temperature (ºC)
On/Off Enable Startup (Vin=5.5V, Vout=1.5V, Iout=3A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=1.5V, Iout=3A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 10 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.8V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.8V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
100
80
Natural convection
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
40
20
0
0
0.5
1
1.5
2
2.5
3
3.5
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Load Current (Amps)
Ambient Temperature (ºC)
On/Off Enable Startup (Vin=5.5V, Vout=1.8V, Iout=3A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=1.8V, Iout=3A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 11 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 2.5V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 2.5V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
95
Natural convection
90
VIN = 5.5V
VIN = 5V
VIN = 3V
85
80
75
70
65
0
0.5
1
1.5
2
2.5
3
3.5
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=3A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=2.5V, Iout=3A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 12 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 3.3V)
On/Off Enable Startup (Vin=5.5V, Vout=3.3V, Iout=3A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=3.3V, Iout=3A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
90
5.0
80
Natural convection
70
4.0
3.0
2.0
1.0
0
V
V
V
IN = 5.5V
IN = 5V
IN = 2.4V
60
50
40
30
20
10
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
0
1
2
3
4
5
6
Load Current (Amps)
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 13 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.2V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.2V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
5.0
4.0
3.0
2.0
1.0
0
Natural convection
80
60
40
20
0
VIN = 5.5V
VIN = 5V
VIN = 2.4V
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
0
1
2
3
4
5
6
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=1.2V, Iout=5A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=1.2V, Iout=5A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=2.5A to 5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 14 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.5V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.5V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
5.0
4.0
3.0
2.0
1.0
0
Natural convection
80
60
40
20
0
VIN = 5.5V
VIN = 5V
VIN = 2.4V
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
0
1
2
3
4
5
6
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=1.5V, Iout=5A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=1.5V, Iout=5A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=2.5A to 5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 15 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.8V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.8V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
5.0
4.0
3.0
2.0
1.0
0
Natural convection
80
60
40
20
0
VIN = 5.5V
VIN = 5V
VIN = 2.4V
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
0
1
2
3
4
5
6
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=1.8V, Iout=5A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=1.8V, Iout=5A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=2.5A to 5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 16 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 2.5V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 2.5V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
95
5.0
4.0
3.0
2.0
1.0
0
Natural convection
90
VIN = 5.5V
VIN = 5V
VIN = 3V
85
80
75
70
65
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
0
1
2
3
4
5
6
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=5A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=2.5V, Iout=5A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=2.5A to 5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 17 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 3.3V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 3.3V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
95
5.0
4.0
3.0
2.0
1.0
0
Natural convection
90
VIN = 5.5V
VIN = 5V
VIN = 3.8V
85
80
75
70
65
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
0
1
2
3
4
5
6
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=3.3V, Iout=5A, Cload=0)
Trace 4=Enable, Trace2=Vout
Output Ripple and Noise (Vin=5V, Vout=3.3V, Iout=5A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=2.5A to 5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 18 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
TAPE AND REEL INFORMATION
2.33
0.092
(P/U)
16.00
0.630
6.86
ROUND
0.270
4.00
0.157
HOLES
22.25
0.876
(P/U)
44.00
1.732
40.40
1.591
2.00
0.079
OBLONG
HOLES
FEED (UNWIND)
DIRECTION -------
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
TOP COVER TAPE
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 1˚
Components are shown for reference only.
5.64
0.222
REF
PIN #1 THIS
CORNER
101.6
4.00
(CORE)
44.0
1.73
REF
(FARSIDE)
10.67
0.420
20.8
0.82
REF
330.2
13.00
PICKUP NOZZLE
LOCATION
(
3-6mm)
13.00
.512
11.9
0.47
REF
REEL INFORMATION
(400 UNITS PER REEL)
PICK & PLACE PICKUP (P/U)
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.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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.
www.murata-ps.com/support
MDC_OKY-T/3,T/5-W5 Series.A12 Page 19 of 19
相关型号：
OL-STRIPE
The light source of the OL-Stripe series is suggested the Everlight LED T5 Cobra light tube.
EVERLIGHT
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