MURATA-PS OKX-T10-T16-W5

OKX T/10 & T/16-W5 Series
www.murata-ps.com
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
PRODUCT OVERVIEW
The OKX-T/10 and -T/16 series are miniature
SIP non-isolated Point-of-Load (POL) DC/DC power
converters for embedded applications. The module
is fully compatible with Distributed-power Open
Standards Alliance (DOSA) industry-standard
specifications (www.dosapower.com). Applications
include powering CPU’s, datacom/telecom systems,
programmable logic and mixed voltage systems.
The wide input range is 2.4 to 5.5 Volts DC. Two
maximum output currents are offered, 10 Amps
(T/10 models) or 16 Amps (T/16 models). Based
on fixed-frequency synchronous buck converter
Typical unit
switching topology, the high power conversion
efficient Point of Load (POL) module features programmable output voltage and On/Off control. An
optional Sequence/Tracking input allows controlled
ramp-up and ramp-down outputs. The Sense input
provides load compensation. These converters also
include under voltage lock out (UVLO), output short
circuit protection, over-current and over temperature protections.
These units are designed to meet all standard
UL/EN/IEC 60950-1 safety certifications and RoHS6 hazardous substance compliance.
FEATURES
„
Non-isolated SIP POL DC/DC power module
„
2.4-5.5Vdc input voltage range
„
Programmable output voltage from 0.7525-3.63Vdc
„
10 Amp (T/10) or 16 Amp (T/16) output current
models
„
Drives 1000 μF ceramic capacitive loads
Contents
Page
Description, Connection Diagram, Photograph
1
Ordering Guide, Model Numbering
2
Mechanical Specifications, Input/Output Pinout
3
Detailed Electrical Specifications
5
Output Voltage Adjustment, Soldering Guidelines, Product Label 6
Application Notes
7
OKX-T/10-W5 Performance Data
10
OKX-T/16-W5 Oscillograms and Performance Data
11
„
High power conversion efficiency 95% at 3.3 Vout
„
Outstanding thermal derating performance
„
Over temperature and over current protection
„
On/Off control, Sense and optional Sequence/
Tracking input
„
UL/EN/IEC 60950-1 safety
„
Industry-standard (DOSA) SIP format
„
RoHS-6 hazardous substance compliance
Connection Diagram
+Vin
F1
+Vout
t4XJUDIJOH
On/Off
Control
Controller
t'JMUFST
Sense
t$VSSFOU4FOTF
External
DC
Power
Source
Trim
Open = On
Closed = Off
(Positive
On/Off)
Reference and
Error Amplifier
Common
Common
Sequence/Tracking (optional)
Figure 1. OKX2-T/10, -T/16
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
For full details go to
www.murata-ps.com/rohs
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MDC_OKX_T10T16-W5 Series.A03 Page 1 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output
Package C86,
Pinout P84
Input
Regulation (Max.)
IOUT
R/N
(Amps Power (mVp-p)
Vin Nom. Range
max) (Watts) Max. f
Line
Load
(Volts) (Volts) ➀
Iin,
no load
(mA)
Iin,
full load
(Amps)
Efficiency
On/Off Sequence/
Polarity Tracking
Model Number ➁
VOUT
(Volts)
OKX-T/10-W5P-C
0.7525-3.63
10
5
2.4-5.5
Pos.
no
OKX-T/10-W5N-C
0.7525-3.63
10
5
2.4-5.5
Neg.
no
OKX2-T/10-W5P-C 0.7525-3.63
10
5
2.4-5.5
Pos.
yes
OKX2-T/10-W5N-C 0.7525-3.63
10
5
2.4-5.5
Neg
yes
33
25
±0.2%
6.91
±0.5%
Min.
94.0%
Typ.
2.0x0.5x0.37
(50.8x12.7x9.4)
2.0x0.5x0.37
(50.8x12.7x9.4)
2.0x0.5x0.37
(50.8x12.7x9.4)
80
0.7525-3.63
16
5
2.4-5.5
Pos.
no
OKX-T/16-W5N-C
0.7525-3.63
16
5
2.4-5.5
Neg.
no
OKX2-T/16-W5P-C 0.7525-3.63
16
5
2.4-5.5
Pos.
yes
OKX2-T/16-W5N-C 0.7525-3.63
16
5
2.4-5.5
Neg.
yes
30
2.0x0.5x0.37
(50.8x12.7x9.4)
95.5%
OKX-T/16-W5P-C
52.8
Case
Dimensions are
in inches (mm)
±0.3%
11.12
93.0%
2.0x0.5x0.37
(50.8x12.7x9.4)
2.0x0.5x0.37
(50.8x12.7x9.4)
95.0%
➀
The input voltage range must be 0.5V greater than the output voltage.
③
Use adequate ground plane and copper thickness adjacent to the converter.
②
All specifications are at nominal line voltage, Vout=nominal (3.3V for W5 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.
④
Ripple and Noise (R/N) is shown at Vout=1V. See specs for details.
2.0x0.5x0.37
(50.8x12.7x9.4)
2.0x0.5x0.37
(50.8x12.7x9.4)
PART NUMBER STRUCTURE
OK X 2 - T / 16 - W5 P J - C
RoHS Hazardous Substance Compliance
C = RoHS-6 (does not claim EU RoHS
exemption 7b–lead in solder)
Okami Non-isolated PoL
SIP Mount
Sequence/Tracking
Blank = Not installed, delete pin 9
2 = Installed, add pin 9
Trimmable Output
Voltage Range
W5 Models = 0.7525-3.63V
Maximum Rated Output
Current in Amps
Reversed Pin Mounting (see pg. 4)
J = Reversed Pins (special order)
Blank = Standard Pins
On/Off Polarity
P = Positive Polarity
N = Negative Polarity
Input Voltage Range
W5 = 2.4-5.5V
Note: Some model number combinations
may not be available. See Ordering Guide
above. Contact Murata Power Solutions for
availability.
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MDC_OKX_T10T16-W5 Series.A03 Page 2 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
MECHANICAL SPECIFICATIONS, STANDARD MODELS
51.3
2.02
48.26
1.900
.060
.060
12.70
.500
35.56
1.400
2.54
.100
TYP
10.16
.400
1.02
.040
(x10 or 11*)
10.16
.400
1.52
.060
4.45
.175
Pin
1
2
3
4
5
I/O CONNECTIONS
Function
Pin
Function
+ Output
6
Common
+ Output
7
+ Input
+Sense In
8
+ Input
+ Output
9* *Sequence/Tracking
Common
10
Trim
11
On/Off Control
*Sequence/Tracking is optional. If not installed, Pin 9 is omitted.
11 10
9*
8
7
6
5
4
3
2
1
RECOMMENDED FOOTPRINT -TOP VIEW
9.4
.37
MAX
50.8
2.00
5.1
.20
REF
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
12.7
.50
11 10
9* 8
7
5
6
4
3
2
1
4.3
.17
12.70
.500
2.54
.100
TYP
1.5
.06
10.16
.400
35.56
1.400
0.76
.030
TYP
1.27
.050
Components are shown for reference only.
MATERIAL:
PINS: COPPER ALLOY
FINISH: (ALL PINS)
PINS: TIN
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
SHIPPING LABEL
555.8
21.88
TUBE LENGTH
TEN (10) UNITS PER TUBE
20.975 BETWEEN BARRELS OF PINS (REF)
20.8
0.82
REF
SHIPPING TUBES
15.9
0.63
REF
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MDC_OKX_T10T16-W5 Series.A03 Page 3 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
MECHANICAL SPECIFICATIONS, CONTINUED: “J” PACKAGE OPTION (REVERSED HEADERS)
51.3
2.02
1.52
.060
48.26
1.900
12.70
.500
35.56
1.400
2.54
.100 TYP
8.6
.34
10.16
.400
1.02
.040
(x10 or 11*)
7.9
.31
11 10
9*
8
7
6
5
4
3
2
Pin
1
2
3
4
5
I/O CONNECTIONS
Function
Pin
Function
+ Output
6
Common
+ Output
7
+ Input
+Sense In
8
+ Input
+ Output
9* *Sequence/Tracking
Common
10
Trim
11
On/Off Control
*Sequence/Tracking is standard for OKX2. On OKX models, Pin 9 is omitted.
1
RECOMMENDED FOOTPRINT -TOP VIEW
50.8
2.00
12.7
.50
9.7
.38
MAX
Dimensions are in inches (mm shown for ref. only).
7.9
.31
Third Angle Projection
3.3
.13
11 10
9* 8
12.70
.500
7
6
5
2.54
.100
TYP
4
3
2
0.76
.030
TYP
1
10.16
.400
35.56
1.400
1.27
.050
1.27
.050
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Components are shown for reference only.
MATERIAL:
PINS: COPPER ALLOY
FINISH: (ALL PINS)
PINS: TIN
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MDC_OKX_T10T16-W5 Series.A03 Page 4 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Performance and Functional Specifications
Prebias Startup
See Note 1
Dynamic Load Response
100 μSec max. to within ±2% of final value
(50-100% load step, di/dt=2.5A/μSec) with 2 x 150 μF polymer external caps.
Input
Input Voltage Range
Start-Up Voltage
Undervoltage Shutdown (see Note 15)
Overvoltage Shutdown
Reflected (Back) Ripple Current (Note 2)
Internal Input Filter Type
Recommended External Fuse
Reverse Polarity Protection
See Ordering Guide and Note 7.
2.05V
1.90V
None
20 mA pk-pk
Capacitive
15A fast blow
N/A. See fuse information
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
No Load
Low Line (Vin=Vmin, Vout=Vnom)
See Ordering Guide
0.4 A2Sec.
5 mA
60 mA
80 mA
9.05A (T/10), 14.63A (T/16)
Remote On/Off Control (Note 5)
Negative Logic (“N” model suffix)
Environmental
Operating Temperature Range (Ambient)
See derating curves
-40 to +85 deg. C. with derating (Note 9)
Operating PC Board Temperature
-40 to +100 deg. Celsius max.,
no derating (12)
Storage Temperature Range
-55 to +125 deg. C.
Thermal Protection/Shutdown
+130 deg. Celsius
Relative Humidity
Current
Tracking/Sequencing (OKX “2” models)
Slew Rate
Tracking accuracy, rising input
Tracking accuracy, falling input
to 85%RH/+85 deg. C., non-condensing
Physical
Outline Dimensions
Weight
Restriction of Hazardous Substances
See Mechanical Specifications
0.2 ounces (5.6 grams)
RoHS-6 (does not claim EU RoHS
exemption 7b–lead in solder)
Absolute Maximum Ratings
ON = Open pin or ground to +0.4V. max.
OFF =+1.5V min. to + Vin (max)
ON = Open pin (internally pulled up) or
+1.5V to +Vin max.
OFF = Ground pin to +0.4V. max.
1 mA max.
Positive Logic (“P” model suffix)
Converter will start up if the external
output voltage is less than Vset
Input Voltage (Continuous or transient)
On/Off Control
Input Reverse Polarity Protection
Output Current (Note 7)
2 Volts per millisecond, max.
Vout = ±200 mV max. of Sequence In
Vout = ±400 mV max. of Sequence In
Storage Temperature
Lead Temperature
0 V.to +5.8 Volts max.
0 V. min. to +Vin max.
See Fuse section
Current-limited. Devices can withstand a
sustained short circuit without damage.
The outputs are not intended to accept
appreciable reverse current.
-55 to +125 deg. C.
See soldering specifications
General and Safety
Efficiency
Switching Frequency
See Ordering Guide
300 KHz
Start-Up Time (Vin on to Vout regulated) 8 mSec for Vout=nominal
(On/Off to Vout regulated)
6 mSec for Vout=nominal
Isolation
Not isolated
Safety
Certified to UL/cUL 60950-1,
CSA-C22.2 No. 60950-1, IEC/EN 60950-1
Calculated MTBF per Telcordia SR-232 (4a) TBC
Absolute maximums are stress ratings. Exposure of devices to greater than any of any
of these conditions may adversely affect long-term reliability. Proper operation under
conditions other than those listed in the Performance/Functional Specifications Table is
not implied nor recommended.
Specification Notes:
(1)
Calculated MTBF per MIL-HDBK-217F (4b) TBC
All models are tested and specified with external 1 μF paralleled with 10 μF ceramic output capacitors
and a 22 μF external input capacitor. All capacitors are low ESR types. These capacitors are necessary
to accommodate our test equipment and may not be required to achieve specified performance in your
applications. However, Murata Power Solutions recommends installation of these capacitors. All models are
stable and regulate within spec under no-load conditions.
Output
Minimum Loading
Accuracy (50% load, untrimmed)
Voltage Output Range (Note 13)
Overvoltage Protection (Note 16)
Temperature Coefficient
Ripple/Noise (20 MHz bandwidth)
Line/Load Regulation
No minimum load
±2 % of Vnominal
See Ordering Guide
None
±0.02% per °C of Vout range
See Ordering Guide and note 8
See Ordering Guide and note 10
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms
Cap-ESR >0.01 Ohms
1,000 μF
5,000 μF (min. cap. load 0 μF)
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up)
34 Amps (OKX2-T/16-W5)
29 Amps (OKX2-T/10-W5)
Short Circuit Mode
Short Circuit Current Output
Protection Method
Short Circuit Duration
1A
Hiccup autorecovery upon overload
removal. (Note 7)
Continuous, no damage
(output shorted to ground)
Specifications are typical at +25 deg.C, Vin=nominal (+5V.), Vout=nominal (+3.3V), full load, external caps
and natural convection unless otherwise indicated. Extended tests at higher power must supply substantial
forced airflow.
(2)
Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is
Cin=2 x 100 μF tantalum, Cbus=1000 μF electrolytic, Lbus=1 μH.
(3)
Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total
RMS current over time does not exceed the Derating curve.
(4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ISSUE 2,
ground fixed controlled conditions, Tambient=+25 deg.C, full output load, natural air convection.
(4b) Mean Time Before Failure is calculated using MIL-HDBK-217F, GB ground benign, Tambient=+25 deg.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 not exceed
+Vin.
(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.
(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.
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MDC_OKX_T10T16-W5 Series.A03 Page 5 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
(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 outputs are not intended to sink appreciable reverse current.
OKX2-T/10-W5, -T/16-W5
Output Voltage
Calculated Rtrim (KΩ)
3.3 V.
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)
Output Voltage Adjustment
The output voltage may be adjusted over a limited range by connecting an external trim resistor (Rtrim) between the Trim pin and Ground. The
Rtrim resistor must be a 1/10 Watt precision metal film type, ±1% accuracy
or better with low temperature coefficient, ±100 ppm/°C. or better. Mount
the resistor close to the converter with very short leads or use a surface
mount trim resistor.
In the tables opposite, the calculated resistance is given. Do not exceed
the specified limits of the output voltage or the converter’s maximum power
rating when applying these resistors. Also, avoid high noise at the Trim
input. However, to prevent instability, you should never connect any capacitors to Trim.
Resistor Trim Equation, W5 models:
21070
RTRIM (:) = ____________
VOUT – 0.7525V
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 on page 1. Here is the layout of the label:
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
115° C.
Maximum Pot Temperature
270° C.
Maximum Solder Dwell Time
7 seconds
–5110
Mfg.
date
code
X00016
Product code
YMDX Rev.
Revision level
Figure 2. Label Artwork Layout
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
Model Number
Product Code
Maximum Preheat Temperature
105° C.
OKX-T/16-W5N-C
X00016
Maximum Pot Temperature
250° C.
OKX-T/16-W5P-C
X01016
Maximum Solder Dwell Time
6 seconds
OKX2-T/16-W5N-C
X20016
OKX2-T/16-W5P-C
X21016
OKX-T/10-W5N-C
X00010
OKX-T/10-W5P-C
X01010
OKX2-T/10-W5N-C
X20010
OKX2-T/10-W5P-C
X21010
For Sn/Pb based solders:
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
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MDC_OKX_T10T16-W5 Series.A03 Page 6 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
APPLICATION NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. 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, i.e. IEC/EN/UL 60950-1.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up input voltage exceeds and remains at the Start-Up
Threshold Voltage (see Specifications). Once operating, converters will not
turn off until the input voltage drops below the Under-Voltage Shutdown Limit.
Subsequent restart will not occur until the input voltage rises again above the
Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as poorly
regulated capacitor inputs), the converter shuts off and then restarts as the
external capacitor recharges. Such situations could oscillate. To prevent this,
make sure the operating input voltage is well above the UV Shutdown voltage
AT ALL TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) is the time interval between the point when
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified regulation
band. Actual measured times will vary with input source impedance, external
input capacitance, input voltage slew rate and final value of the input voltage
as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
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.
suggested capacitor values are 10 to 22 μF, rated at twice the expected maximum input voltage. Make sure that the input terminals do not go below the
undervoltage shutdown voltage at all times. More input bulk capacitance may
be added in parallel (either electrolytic or tantalum) if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response.
Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.
Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in
parallel. Mount these close to the converter. Measure the output ripple under
your load conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capacitance listed in the specifications.
Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. The Cbus and Lbus
components simulate a typical DC voltage bus. Please note that the values of
Cin, Lbus and Cbus may vary according to the specific converter model.
TO
OSCILLOSCOPE
CURRENT
PROBE
+INPUT
VIN
+
–
+
–
LBUS
CBUS
CIN
-INPUT
CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz
CBUS = 1000μF, ESR < 100mΩ @ 100kHz
LBUS = 1μH
Figure 2: Measuring Input Ripple Current
In figure 3, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. In order to minimize circuit
errors and standardize tests between units, scope measurements should be
made using BNC connectors or the probe ground should not exceed one half
inch and soldered directly to the test circuit.
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.
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.
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
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
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MDC_OKX_T10T16-W5 Series.A03 Page 7 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
COPPER STRIP
+SENSE
+OUTPUT
C1
C2
SCOPE
RLOAD
-OUTPUT
COPPER STRIP
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3: Measuring Output Ripple and Noise (PARD)
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
temperature hysteresis to prevent rapid on/off cycling.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in the next section illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airflow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that very low flow rates (below about 25 LFM) are similar to “natural
convection”, that is, not using fan-forced airflow.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approximately 98% of nominal output voltage for most models), the PWM controller
will shut down. Following a time-out period, the PWM will restart, causing the
output voltage to begin ramping up to its appropriate value. If the short-circuit
condition persists, another shutdown cycle will initiate. This rapid on/off cycling
is called “hiccup mode”. The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component
damage. A short circuit can be tolerated indefinitely.
Remote Sense Input
The Sense input is normally connected at the load for the respective Sense
polarity (+Sense to the +Vout load). The sense input compensates for voltage
drops along the output wiring such as moderate IR drops and the current
carrying capacity of PC board etch. This output drop (the difference between
Sense and Vout when measured at the converter) should not exceed 0.5V. Use
heavier connections if this drop is excessive. The sense input also improves the
stability of the converter and load system by optimizing the control loop phase
margin.
If the Sense function is not used for remote regulation, the user should connect the Sense to their respective Vout at the converter pins.
Sense lines on the PCB should run adjacent to DC signals, preferably
Ground. Any long, distributed wiring and/or significant inductance introduced
into the Sense control loop can adversely affect overall system stability. If in
doubt, test your applications by observing the converter’s output transient
response during step loads. There should not be any appreciable ringing or
oscillation.
Do not exceed maximum power ratings. Excessive voltage differences
between Vout and Sense together with trim adjustment of the output can cause
the overvoltage protection circuit to activate and shut down the output.
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage at the ouput pins. Therefore the
designer must insure:
(Vout at pins) x (Iout) ≤ (Max. rated output power)
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance.
Remote On/Off Control
The remote On/Off Control can be ordered with either polarity. Please refer to
the Connection Diagram on page 1 for On/Off connections.
CAUTION: If you routinely or accidentally exceed these Derating guidelines,
the converter may have an unplanned Over Temperature shut down. Also, these
graphs are all collected at slightly above Sea Level altitude. Be sure to reduce
the derating for higher density altitude.
Positive polarity models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Therefore, the On/Off control can be
disconnected if the converter should always be on. Positive-polarity devices are
disabled when the On/Off is grounded or brought to within a low voltage (see
Specifications) with respect to –Vin.
Output Current Limiting
Current limiting inception is defined as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifications.
Note particularly that the output current may briefly rise above its rated value
in normal operation as long as the average output power is not exceeded. This
enhances reliability and continued operation of your application. If the output
current is too high, the converter will enter the short circuit condition.
Negative polarity devices are on (enabled) when the On/Off pin is left open
or brought to within a low voltage (see Specifications) with respect to –Vin. The
device is off (disabled) when the On/Off is pulled high (see Specifications) with
respect to –Vin.
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MDC_OKX_T10T16-W5 Series.A03 Page 8 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Dynamic control of the On/Off function must sink appropriate signal current
when brought low and withstand appropriate voltage when brought high.
Be aware too that there is a finite time in milliseconds (see Specifications)
between the time of On/Off Control activation and stable, regulated output. This
time will vary slightly with output load type and current and input conditions.
[2] Allow the converter to stabilize (typically less than 20 mS after +Vin
power on) before raising the Sequence/Tracking input. Also, if you wish to have
a ramped power down, leave +Vin powered all during the down ramp. Do not
simply shut off power.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifications. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve your noise and surge response objectives. Excess
external capacitance may cause regulation problems and possible oscillation
or instability. Proper wiring of the Sense inputs will improve these factors under
capacitive load.
[4] Observe the Output slew rate relative to the Sequence/Tracking input.
A rough guide is 2 Volts per millisecond maximum slew rate. If you exceed
this slew rate on the Sequence/Tracking pin, the converter will simply ramp
up at it’s maximum output slew rate (and will not necessarily track the faster
Sequence/Tracking input).
The maximum rated output capacitance and ESR specification is given for a
capacitor installed immediately adjacent to the converter. Any extended output
wiring, smaller wire gauge or less ground plane may tolerate somewhat higher
capacitance. Also, capacitors with higher ESR may use a larger capacitance.
[5] Be aware of the input characteristics of the Sequence/Tracking pin. The
high input impedance affects the time constant of any small external ramp
capacitor. And the bias current will slowly charge up any external caps over
time if they are not grounded.
Sequence/Tracking Input (Optional)
After external input power is applied and the converter stabilizes, a high
impedance Sequence/Tracking input pin accepts an external analog voltage referred to -Vin. The output power voltage will then track this Sequence/
Tracking input at a one-to-one ratio up to the nominal set point voltage for that
converter. This Sequencing input may be ramped, delayed, stepped or otherwise phased as needed for the output power, all fully controlled by the user’s
external circuits. As a direct input to the converter’s feedback loop, response to
the Sequence/Tracking input is very fast (milliseconds).
[6] Allow the converter to eventually achieve its full rated setpoint output
voltage. Do not remain in ramp up/down mode indefinitely. The converter is
characterized and meets all its specifications only at the setpoint voltage (plus
or minus any trim voltage).
Operation
To use the Sequence/Tracking pin after power start-up stabilizes, apply a
rising external voltage to the Sequence/Tracking input. As the voltage rises, the
output voltage will track the Sequence/Tracking input (gain = 1). The output
voltage will stop rising when it reaches the normal set point for the converter.
The Sequence/Tracking input may optionally continue to rise without any effect
on the output. Keep the Sequence/Tracking input voltage below the converter’s
input supply voltage.
Use a similar strategy on power down. The output voltage will stay constant
until the Sequence/Tracking input falls below the set point.
Guidelines for Sequence/Tracking Applications
[3] If you do not plan to use the Sequence/Tracking pin, leave it open.
The reason to carefully consider the slew rate limitation is in case you want
two different POL’s to precisely track each other.
[7] The Sequence/Tracking is a sensitive input into the feedback control loop
of the converter. Avoid noise and long leads on this input. Keep all wiring very
short. Use shielding if necessary.
Pre-Biased Startup
Some sections have external power already partially applied (possibly because
of earlier power sequencing) before POL power up. Or leakage power is present so that the DC/DC converter must power up into an existing output voltage.
This power may either be stored in an external bypass capacitor or supplied by
an active source. These converters include a pre-bias startup mode to prevent
initialization problems.
This “pre-biased” condition can also occur with some types of programmable logic or because of blocking diode leakage or small currents passed
through forward biased ESD diodes. This feature is variously called “monotonic” because the voltage does not decay or produce a negative transient
once the input power is applied and startup begins.
Sequence/Tracking operation is not available during pre-bias startup.
[1] Leave the converter’s On/Off Enable control in the On setting. Normally,
you should just leave the On/Off pin open.
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MDC_OKX_T10T16-W5 Series.A03 Page 9 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
PERFORMANCE DATA – OKX-T/10-W5
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 3.3V)
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 2.5V)
100
100
95
95
VIN = 3.8V
VIN = 5V
VIN = 5.5V
90
Efficiency (%)
Efficiency (%)
90
85
85
80
80
75
75
70
0
1
2
3
4
5
6
7
8
9
VIN = 3V
VIN = 5V
VIN = 5.5V
70
10
0
2
Load Curre nt (Amps)
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.8V)
100
95
95
90
8
10
90
VIN = 2.4V
VIN = 5V
VIN = 5.5V
85
Efficiency (%)
Efficiency (%)
6
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.5V)
100
80
75
75
0
2
4
6
8
VIN = 2.4V
VIN = 5V
VIN = 5.5V
85
80
70
70
10
0
2
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.2V)
100
90
90
80
VIN = 2.4V
VIN = 5V
VIN = 5.5V
8
10
VIN = 2.4V
VIN = 5V
VIN = 5.5V
70
Efficiency (%)
70
6
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 0.75V)
100
80
4
Load Curre nt (Amps)
Load Curre nt (Amps)
Efficiency (%)
4
Load Curre nt (Amps)
60
50
40
60
50
40
30
30
20
20
10
10
0
0
0
2
4
6
Load Curre nt (Amps)
8
10
0
2
4
6
8
10
Load Curre nt (Amps)
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MDC_OKX_T10T16-W5 Series.A03 Page 10 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
PERFORMANCE DATA – OKX-T/10-W5
OKX2-T/10-W5 Maximum Current Temperature Derating at Sea Level
(For VIN= 5.0V, VOUT = 0.75 to 3.3V. For VIN= 3.3V, VOUT = 0.75 to 2.5V. Longitudinal airflow.).
Output Current (Amps)
12
10
Natural convection
8
6
4
2
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
PERFORMANCE DATA – OKX-T/16-W5
OKX2-T/16-W5 Output Ripple and Noise
(Vin=5V, Vout=1.5V, Iout=16A, Cload=0, ScopeBW=100MHz)
OKX2-T/16-W5 On/Off Enable Startup Delay
(Vin=5V, Vout=1.5V, Iout=16A, Cload=0) Trace 2=Enable In, Trace 1=Vout
OKX2-T/16-W5 Step Load Transient Response
OKX2-T/16-W5 Step Load Transient Response
(Vin=5V, Vout=1.5V, Cload=0, Iout=16A to 8A) Trace 1=Vout, 100 mV/div. Trace 4=Iout, 5A/div. (Vin=5V, Vout=1.5V, Cload=0, Iout=8A to 16A) Trace 1=Vout, 100 mV/div. Trace 4=Iout, 5A/div.
In this graphic data, 10 Amp models perform identically to 16 Amp models with the limitation of 10 Amps output.
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MDC_OKX_T10T16-W5 Series.A03 Page 11 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
PERFORMANCE DATA – OKX-T/16-W5
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 3.3V)
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 2.5V)
100
100
95
95
VIN = 3.8V
VIN = 5V
VIN = 5.5V
85
85
80
80
75
75
70
0
2
4
6
8
VIN = 3V
VIN = 5V
VIN = 5.5V
90
Efficiency (%)
Efficiency (%)
90
10
12
14
70
16
0
2
4
Load Curre nt (Amps)
10
12
14
16
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.5V)
100
100
95
95
VIN = 2.4V
VIN = 5V
VIN = 5.5V
VIN = 2.4V
VIN = 5V
VIN = 5.5V
90
Efficiency (%)
Efficiency (%)
8
Load Curre nt (Amps)
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.8V)
90
6
85
85
80
80
75
75
70
70
0
2
4
6
8
10
12
14
0
16
2
4
Load Curre nt (Amps)
6
8
10
12
14
16
Load Curre nt (Amps)
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 1.2V)
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25°C
(VOUT = 0.75V)
100
100
95
95
90
Efficiency (%)
Efficiency (%)
90
VIN = 2.4V
VIN = 5V
VIN = 5.5V
85
85
VIN = 2.4V
VIN = 5V
VIN = 5.5V
80
75
80
70
75
65
60
70
0
2
4
6
8
10
Load Curre nt (Amps)
12
14
16
0
2
4
6
8
10
12
14
16
Load Curre nt (Amps)
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MDC_OKX_T10T16-W5 Series.A03 Page 12 of 13
OKX T/10 & T/16-W5 Series
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
PERFORMANCE DATA – OKX-T/16-W5
OKX2-T/16-W5 Maximum Current Temperature Derating at Sea Level
(For VIN= 5.0V, VOUT = 0.75 to 3.3V. For VIN= 3.3V, VOUT = 0.75 to 2.5V. Longitudinal airflow.).
16.5
Output Current (Amps)
16.0
Natural convection
15.5
15.0
14.5
14.0
13.5
13.0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
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.
© 2011 Murata Power Solutions, Inc.
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MDC_OKX_T10T16-W5 Series.A03 Page 13 of 13
Mouser Electronics
Related Product Links
580-OKX2-T/10-W5N-C - Murata OKX2-T/10-W5N-C
580-OKX2-T/16-W5N-C - Murata OKX2-T/16-W5N-C
580-OKX-T/10-W5N-C - Murata OKX-T/10-W5N-C
580-OKX-T/16-W5N-C - Murata OKX-T/16-W5N-C