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OKX T/10 & T/16-W5 Series
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 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.
PRELIMINARY
Typical unit
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 F ceramic capacitive loads 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
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
On/Off Control
Sense Controller
External DC Power Source
Trim Open = On Closed = Off (Positive On/Off) Common Reference and Error Amplifier
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_MDC_OKX_T10T16-W5 Series.A01_D3 Page 1 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output Input Iin, no load (mA) Iin, full load (Amps) Efficiency Min. Typ. Pos. Neg. 6.91 5 2.4-5.5 94.0% 95.5% Pos. Neg 80 5 2.4-5.5 Pos. Neg. 11.12 5 2.4-5.5 93.0% 95.0% Pos. Neg. yes yes 2.0x0.5x0.37 (50.8x12.7x9.4) 2.0x0.5x0.37 (50.8x12.7x9.4) no no 2.0x0.5x0.37 (50.8x12.7x9.4) 2.0x0.5x0.37 (50.8x12.7x9.4) yes yes 2.0x0.5x0.37 (50.8x12.7x9.4) 2.0x0.5x0.37 (50.8x12.7x9.4) no no On/Off Sequence/ Polarity Tracking Package C86, Pinout P84 Case
Dimensions are in inches (mm)
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Model Number OKX-T/10-W5P-C
VOUT (Volts)
0.7525-3.63
Regulation (Max.) IOUT R/N (Amps Power (mVp-p) Vin Nom. Range max) (Watts) Max. f Line Load (Volts) (Volts) 10 5 2.4-5.5
2.0x0.5x0.37 (50.8x12.7x9.4) 2.0x0.5x0.37 (50.8x12.7x9.4)
OKX-T/10-W5N-C
0.7525-3.63
10 33 25 0.2%
5
2.4-5.5
OKX2-T/10-W5P-C 0.7525-3.63
10
OKX2-T/10-W5N-C 0.7525-3.63
10 0.5%
5
2.4-5.5
OKX-T/16-W5P-C
0.7525-3.63
16
OKX-T/16-W5N-C
0.7525-3.63
16 52.8 30 0.3%
5
2.4-5.5
OKX2-T/16-W5P-C 0.7525-3.63
16
OKX2-T/16-W5N-C 0.7525-3.63

16
5
2.4-5.5

The input voltage range must be 0.5V greater than the output voltage. 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 F ceramic and 10 F electrolytic in parallel. Input cap is 22 F. See detailed specifications. I/O caps are necessary for our test equipment and may not be needed for your application.
Use adequate ground plane and copper thickness adjacent to the converter. Ripple and Noise (R/N) is shown at Vout=1V. See specs for details.
PART NUMBER STRUCTURE
OK X 2 - T / 16 - W5 P J - C
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. RoHS Hazardous Substance Compliance C = RoHS-6 (does not claim EU RoHS exemption 7b-lead in solder)
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 2 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
MECHANICAL SPECIFICATIONS, STANDARD MODELS
51.3 2.02 48.26 1.900 12.70 .500 2.54 .100 TYP 4.45 .175 35.56 1.400 10.16 .400 .060 .060 1.02 .040 (x10 or 11*) 1.52 .060
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Pin 1 2 3 4 5
10.16 .400
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
50.8 2.00
9.4 .37 MAX 5.1 .20 REF
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
12.7 .50
11 10 9* 8 7 6 5 4 3 2 1
4.3 .17 2.54 .100 TYP 10.16 .400 35.56 1.400 1.27 .050 1.5 .06 0.76 .030 TYP
12.70 .500 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 Components are shown for reference only.
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_MDC_OKX_T10T16-W5 Series.A01_D3 Page 3 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
51.3 2.02 48.26 1.900 12.70 .500 2.54 .100 TYP 35.56 1.400 10.16 .400 1.02 .040 (x10 or 11*) 1.52 .060
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
MECHANICAL SPECIFICATIONS, CONTINUED: "J" PACKAGE OPTION (REVERSED HEADERS)
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
8.6 .34
7.9 .31
11 10 9* 8 7 6 5 4 3 2 1
Pin 1 2 3 4 5
*Sequence/Tracking is standard for OKX2. On OKX models, Pin 9 is omitted.
RECOMMENDED FOOTPRINT -TOP VIEW
9.7 .38 MAX 50.8 2.00 7.9 .31
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
12.7 .50
3.3 .13
11 10
9* 8
7
6
5
4
3
2
1
12.70 .500
2.54 .100 TYP
10.16 .400 35.56 1.400 1.27 .050
0.76 .030 TYP 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_MDC_OKX_T10T16-W5 Series.A01_D3 Page 4 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
Performance and Functional Specifications
See Note 1
Input
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Prebias Startup Converter will start up if the external output voltage is less than Vset
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 Input Current: Full Load Conditions Inrush Transient Shutdown Mode (Off, UV, OT) Output in Short Circuit No Load Low Line (Vin=Vmin, Vout=Vnom) Remote On/Off Control (Note 5) Negative Logic ("N" model suffix) Positive Logic ("P" model suffix)
See Ordering Guide and Note 7. 2.05V 1.90V None 20 mA pk-pk Capacitive 15A fast blow N/A. See fuse information See Ordering Guide 0.4 A2Sec. 5 mA 60 mA 80 mA 9.05A (T/10), 14.63A (T/16) 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. 2 Volts per millisecond, max. Vout = 200 mV max. of Sequence In Vout = 400 mV max. of Sequence In
Dynamic Load Response 100 Sec max. to within 2% of final value (50-100% load step, di/dt=2.5A/Sec) with 2 x 150 F polymer external caps.
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 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
Current Tracking/Sequencing (OKX "2" models) Slew Rate Tracking accuracy, rising input Tracking accuracy, falling input
Input Voltage (Continuous or transient) On/Off Control Input Reverse Polarity Protection Output Current (Note 7)
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 Calculated MTBF per MIL-HDBK-217F (4b) TBC
Output
Absolute maximums are stress ratings. Exposure of devices to greater than any of any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied nor recommended.
Specification Notes:
(1) Specifications are typical at +25 deg.C, Vin=nominal (+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. All models are tested and specified with external 1 F paralleled with 10 F ceramic output capacitors and a 22 F external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. However, Murata Power Solutions recommends installation of these capacitors. All models are stable and regulate within spec under no-load conditions. (2) (3) 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. 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.
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 Maximum Capacitive Loading (Note 14) Cap-ESR=0.001 to 0.01 Ohms Cap-ESR >0.01 Ohms Current Limit Inception (Note 6) (98% of Vout setting, after warm up) Short Circuit Mode Short Circuit Current Output Protection Method Short Circuit Duration
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 1,000 F 5,000 F (min. cap. load 0 F) 34 Amps (OKX2-T/16-W5) 29 Amps (OKX2-T/10-W5) 1A Hiccup autorecovery upon overload removal. (Note 7) Continuous, no damage (output shorted to ground)
(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. Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. "Hiccup" overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation. Output 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.
(6) (7)
(8)
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 5 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
(9) All models are fully operational and meet published specifications, including "cold start" at -40C. (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.
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
OKX2-T/10-W5, -T/16-W5
Output Voltage 3.3 V. 2.5 V. 2.0 V. 1.8 V. 1.5 V. 1.2 V. 1.0 V. 0.7525 V. Calculated Rtrim (K) 3.160 6.947 11.780 15.004 23.077 41.973 84.621 (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. 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)
Mfg. date code
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:
-5110
X00016 YMDX Rev.
Product code 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
X00016 X01016 X20016 X21016 X00010 X01010 X20010 X21010
For Sn/Ag/Cu based solders: Maximum Preheat Temperature Maximum Pot Temperature Maximum Solder Dwell Time For Sn/Pb based solders: Maximum Preheat Temperature Maximum Pot Temperature Maximum Solder Dwell Time 105 C. 250 C. 6 seconds 115 C. 270 C. 7 seconds
OKX-T/16-W5N-C OKX-T/16-W5P-C OKX2-T/16-W5N-C OKX2-T/16-W5P-C OKX-T/10-W5N-C OKX-T/10-W5P-C OKX2-T/10-W5N-C OKX2-T/10-W5P-C
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_MDC_OKX_T10T16-W5 Series.A01_D3 Page 6 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
APPLICATION NOTES
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
suggested capacitor values are 10 to 22 F, 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 F 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.
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. Recommended Input Filtering The user must assure that the input source has low AC impedance to provide dynamic stability and that the input supply has little or no inductive content, including long distributed wiring to a remote power supply. The converter will operate with no additional external capacitance if these conditions are met. For best performance, we recommend installing a low-ESR capacitor immediately adjacent to the converter's input terminals. The capacitor should be a ceramic type such as the Murata GRM32 series or a polymer type. Initial
TO OSCILLOSCOPE
CURRENT PROBE +INPUT LBUS CBUS CIN
VIN
+ - + -
-INPUT CIN = 2 x 100F, ESR < 700m @ 100kHz CBUS = 1000F, ESR < 100m @ 100kHz LBUS = 1H
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. Minimum Output Loading Requirements All models regulate within specification and are stable under no load to full load conditions. Operation under no load might however slightly increase output ripple and noise. Thermal Shutdown To prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/DC's to rise above the Operating Temperature Range
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 7 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
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) Remote On/Off Control The remote On/Off Control can be ordered with either polarity. Please refer to the Connection Diagram on page 1 for On/Off connections. Positive polarity models are enabled when the On/Off pin is left open or is pulled high to +Vin with respect to -Vin. Therefore, the On/Off control can be disconnected if the converter should always be on. Positive-polarity devices are disabled when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to -Vin. Negative polarity devices are on (enabled) when the On/Off pin is left open or brought to within a low voltage (see Specifications) with respect to -Vin. The device is off (disabled) when the On/Off is pulled high (see Specifications) with respect to -Vin.
+SENSE +OUTPUT
COPPER STRIP
C1
C2
SCOPE
RLOAD
-OUTPUT COPPER STRIP
C1 = 0.1F CERAMIC C2 = 10F 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. 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. CAUTION: If you routinely or accidentally exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected at slightly above Sea Level altitude. Be sure to reduce the derating for higher density altitude. Output Current Limiting Current limiting inception is 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.
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 8 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
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. 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. 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. 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). Operation To use the Sequence/Tracking pin after power start-up stabilizes, apply a rising external voltage to the Sequence/Tracking input. As the voltage rises, the output voltage will track the Sequence/Tracking input (gain = 1). The output voltage will stop rising when it reaches the normal set point for the converter. The Sequence/Tracking input may optionally continue to rise without any effect on the output. Keep the Sequence/Tracking input voltage below the converter's input supply voltage. Use a similar strategy on power down. The output voltage will stay constant until the Sequence/Tracking input falls below the set point. Guidelines for Sequence/Tracking Applications [1] Leave the converter's On/Off Enable control in the On setting. Normally, you should just leave the On/Off pin open.
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
[2] Allow the converter to stabilize (typically less than 20 mS after +Vin power on) before raising the Sequence/Tracking input. Also, if you wish to have a ramped power down, leave +Vin powered all during the down ramp. Do not simply shut off power. [3] If you do not plan to use the Sequence/Tracking pin, leave it open. [4] Observe the Output slew rate relative to the Sequence/Tracking input. A rough guide is 2 Volts per millisecond maximum slew rate. If you exceed this slew rate on the Sequence/Tracking pin, the converter will simply ramp up at it's maximum output slew rate (and will not necessarily track the faster Sequence/Tracking input). The reason to carefully consider the slew rate limitation is in case you want two different POL's to precisely track each other. [5] Be aware of the input characteristics of the Sequence/Tracking pin. The high input impedance affects the time constant of any small external ramp capacitor. And the bias current will slowly charge up any external caps over time if they are not grounded. [6] Allow the converter to eventually achieve its full rated setpoint output voltage. Do not remain in ramp up/down mode indefinitely. The converter is characterized and meets all its specifications only at the setpoint voltage (plus or minus any trim voltage). [7] The Sequence/Tracking is a sensitive input into the feedback control loop of the converter. Avoid noise and long leads on this input. Keep all wiring very short. Use shielding if necessary. Pre-Biased Startup Some sections have external power already partially applied (possibly because of earlier power sequencing) before POL power up. Or leakage power is 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.
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 9 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
PERFORMANCE DATA - OKX-T/10-W5
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 3.3V)
100
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 2.5V)
100
95 VIN = 3.8V VIN = 5V VIN = 5.5V
95
90 Efficiency (%)
90 Efficiency (%) VIN = 3V VIN = 5V VIN = 5.5V
85
85
80
80
75
75
70 0 1 2 3 4 5 6 7 8 9 10 Load Curre nt (Amps)
70 0 2 4 6 8 10 Load Curre nt (Amps)
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.8V)
100
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.5V)
100
95
95
90 Efficiency (%) Efficiency (%) VIN = 2.4V VIN = 5V VIN = 5.5V
90 VIN = 2.4V VIN = 5V VIN = 5.5V
85
85
80
80
75
75
70 0 2 4 6 8 10 Load Curre nt (Amps)
70 0 2 4 6 8 10 Load Curre nt (Amps)
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.2V)
100 90 80 70 Efficiency (%) 60 50 40 30 20 10 0 0 2 4 6 8 10 Load Curre nt (Amps) VIN = 2.4V VIN = 5V VIN = 5.5V
OKX-T/10-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 0.75V)
100 90 80 70 Efficiency (%) 60 50 40 30 20 10 0 0 2 4 6 8 10 Load Curre nt (Amps) VIN = 2.4V VIN = 5V VIN = 5.5V
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 10 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
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.).
12
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Output Current (Amps)
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 (C)
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_MDC_OKX_T10T16-W5 Series.A01_D3 Page 11 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
PERFORMANCE DATA - OKX-T/16-W5
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 3.3V)
100
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 2.5V)
100
95 VIN = 3.8V VIN = 5V VIN = 5.5V
95 VIN = 3V VIN = 5V VIN = 5.5V
90 Efficiency (%)
90 Efficiency (%) 10 12 14 16
85
85
80
80
75
75
70 0 2 4 6 8 Load Curre nt (Amps)
70 0 2 4 6 8 10 12 14 16 Load Curre nt (Amps)
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.8V)
100
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.5V)
100
95 VIN = 2.4V VIN = 5V VIN = 5.5V
95
90 Efficiency (%)
90 Efficiency (%)
VIN = 2.4V VIN = 5V VIN = 5.5V
85
85
80
80
75
75
70 0 2 4 6 8 10 12 14 16 Load Curre nt (Amps)
70 0 2 4 6 8 10 12 14 16 Load Curre nt (Amps)
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.2V)
100
OKX-T/16-W5 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 0.75V)
100 95
95 90 90 Efficiency (%) VIN = 2.4V VIN = 5V VIN = 5.5V Efficiency (%) 85 80 75 70 75 65 60 0 2 4 6 8 10 12 14 16 0 2 4 6 8 10 12 14 16 Load Curre nt (Amps) Load Curre nt (Amps) VIN = 2.4V VIN = 5V VIN = 5.5V
85
80
70
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 12 of 13
OKX T/10 & T/16-W5 Series
PRELIMINARY
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 16.0
Adjustable DOSA 10/16-Amp SIP DC/DC Converters
Output Current (Amps)
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 (C)
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 81-3-3779-1031, email: japan@murata-ps.com Kyoto, Tel: 81-75-955-7269, email: japan@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
08/24/09
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. (c) 2009 Murata Power Solutions, Inc.
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MDC_MDC_OKX_T10T16-W5 Series.A01_D3 Page 13 of 13

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