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PRODUCT OVERVIEW
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Typical unit
FEATURES
Wide 8.3-14 VDC input range Non-isolated output adjustable from 0.7525 to 5.5 Volts up to 16 Amps DOSA-compatible SMT package Optional sequence/tracking operation Outstanding thermal performance and derating Short circuit protection On/Off control High efficiency up to 94.5% Over temperature protection Meets UL/EN/IEC 60950-1 safety approvals.
The OKY-T/10 and -T/16 series are miniature SMT non-isolated Point-of-Load (POL) DC/DC power converters for embedded applications. The module is fully compatible with Distributed-power Open Standards Alliance (DOSA) industry-standard specifications (www.dosapower.com). Applications include powering CPU's, datacom/telecom systems, programmable logic and mixed voltage systems. The wide input range is 8.3 to 14 Volts DC. Two maximum output currents are offered, 10 Amps (T/10 models) or 16 Amps (T/16 models). Based on 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 remote sense. 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 and FCC EMI/RFI emissions certifications and RoHS-6 hazardous substance compliance.
Contents Description, Connection Diagram, Photograph Ordering Guide, Model Numbering Mechanical Specifications, Input/Output Pinout Detailed Electrical Specifications Output Voltage Adjustment, Soldering Guidelines Application Notes Performance Data - OKY2-T/10-D12 Performance Data and Oscillograms - OKY2-T/16-D12 Tape and Reel Information Product Label, MTBF Table
Page 1 2 3 4 5 6 9 11 16 17
Simplified Block Diagram
+Vin F1 +Vout
On/Off Control
Sense Controller
External DC Power Source
Trim Open = On Closed = Off (Positive On/Off) Common Reference and Error Amplifier
Common
Figure 1. OKY-T/10, -T/16
Sequence/Tracking (OKY2 only)
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_OKY_T10T16.D12.A05_long Page 1 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Performance Specifications and Ordering Guide
ORDERING GUIDE On/Off Polarity Sequence/ Track Output VOUT (Volts) Input Package, C83
Model Number
Efficiency R/N (mVp-p) Regulation (Max.) VIN IOUT IIN, IIN, (Amps Power Nom. Range no load full load max) (Watts) Max. g Line Load (Volts) (Volts) (mA) (Amps) Min. Typ. 10 10 10 10 16 16 16 16 50 50 50 50 80 80 80 80 40 40 40 40 40 40 40 40 0.15% 0.25% 0.15% 0.25% 0.15% 0.25% 0.15% 0.25% 0.22% 0.25% 0.22% 0.25% 0.22% 0.25% 0.22% 0.25% 12 12 12 12 12 12 12 12 8.3-14 8.3-14 8.3-14 8.3-14 8.3-14 8.3-14 8.3-14 8.3-14 80 80 80 80 80 80 80 80 4.41 4.41 4.41 4.41 7.09 7.09 7.09 7.09 93% 94.5%
Case 1.3x0.53x0.33 (33x13.5x8.4) 1.3x0.53x0.33 (33x13.5x8.4) 1.3x0.53x0.33 (33x13.5x8.4) 1.3x0.53x0.33 (33x13.5x8.4) 1.3x0.53x0.33 (33x13.5x8.4) 1.3x0.53x0.33 (33x13.5x8.4) 1.3x0.53x0.33 (33x13.5x8.4) 1.3x0.53x0.33 (33x13.5x8.4)
Pinout P66 P66 P66 P66 P66 P66 P66 P66
OKY-T/10-D12P-C 0.7525-5.5 OKY-T/10-D12N-C 0.7525-5.5 OKY2-T/10-D12P-C 0.7525-5.5 OKY2-T/10-D12N-C 0.7525-5.5 OKY-T/16-D12P-C 0.7525-5.5 OKY-T/16-D12N-C 0.7525-5.5 OKY2-T/16-D12P-C 0.7525-5.5 OKY2-T/16-D12N-C 0.7525-5.5

Dimensions are in inches (mm).
Pos.
No No Yes Yes No No Yes Yes
93% 94.5% Neg. 93% 94.5% Pos.
93% 94.5% Neg. 92.5% 94% 92.5% 94% 92.5% 94% 92.5% 94% Pos. Neg. Pos. Neg.
The input voltage range must be 13.2 Volts max. for Vout >= 3.63 V. All specifications are at nominal line voltage, Vout=nominal (5V for D12 models) and full load, +25 deg.C. unless otherwise noted. Output capacitors are 1 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.
f Use adequate ground plane and copper thickness adjacent to the converter. g Ripple and Noise (R/N) is shown at Vout=1V. See specs for details.
PART NUMBER STRUCTURE
OK Y 2 - T / 16 - D12 P - C
Okami Non-isolated PoL Surface Mount Sequence/tracking Blank=Not installed, delete seq/track contact 2=Installed, add seq/track contact Trimmable Output Voltage Range D12 Models = 0.7525-5.5V RoHS Hazardous Substance Compliance C = RoHS-6 (does not claim EU RoHS exemption 7b-lead in solder) On/Off Polarity P = Positive Polarity N = Negative Polarity
Input Voltage Range D12 = 8.3-14V
Maximum Rated Output Current in Amps
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MDC_OKY_T10T16.D12.A05_long Page 2 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
MECHANICAL SPECIFICATIONS
PIN #1 THIS CORNER (FARSIDE)
TOP VIEW
[13.5] 0.53 REF
ISOMETRIC VIEW
[6.9] 0.27 [12.7] 0.50 [8.4] 0.33
NOZZLE PICKUP POINT
END VIEW
PIN #1 [1.60] 0.063
SIDE VIEW MTG PLANE
[3.05] 0.120 [33.0] 1.30 [19.3] 0.760 REF 4x [4.83] 0.190
3 BOTTOM VIEW 2
[0.64] 0.025
4
5
6
7
[10.29] 0.405 [13.5] 0.53
1
[29.9] 1.177 [1.22] 0.048
[1.91] 0.075 [33.0] 1.30 REF [29.9] 1.177 [26.85] 1.057 [22.02] 0.867
[.064] 0.025
[3.05] 0.120 MIN [3.43] 0.135 MAX [1.91] 0.075
[13.5] 0.53 REF [2.41] 0.095 MIN [2.79] 0.110 MAX
2 3 4 56 7
1
[10.29] 0.405
DIMENSIONS ARE IN INCHES [mm] TOLERANCES: x.xxx .02 in. x.xx .010 in. ANGLES: 1
[7.54] 0.297 [12.37] 0.487 [17.20] 0.677
[1.22] 0.048
RECOMMENDED PAD LAYOUT
COMPONENTS SHOWN ARE FOR REFERENCE ONLY MATERIAL: SMT PINS: COPPER ALLOY
THIRD ANGLE PROJECTION
I/O CONNECTIONS Pin Function P66 1 On/Off Control * 2 +Vin 3 Vtrack Seq** 4 Gnd (Common) 5 +Vout 6 Trim 7 Sense * The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) polarity. ** Vtrack Seq applies only to OKY2 models. No connection for OKY models.
FINISH: (ALL PINS) GOLD (5u"MIN) OVER NICKEL (50u" MIN)
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MDC_OKY_T10T16.D12.A05_long Page 3 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Performance and Functional Specifications
See Note 1
Input Output, continued
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. 8.00V 7.75V) None 20 mA pk-pk Capacitive 15A (T/10); 20A (T/16) N/A. See fuse information See Ordering Guide 0.4 A2Sec. 5 mA 100 mA (T/10); 60 mA (T/16) 80 mA 6.34 A (T/10);10.2 A (T/16) ON = Open pin or ground to +0.3V. max. OFF =+2.5V min. to + Vin (max) ON = Open pin to +Vin max. (internally pulled up) OFF = Ground pin to +0.3V. max. 1 mA max. 2 Volts per millisecond, max. Vout = +/-100 mV of Sequence In Vout = +/-200 mV of Sequence In
Short Circuit Duration Prebias Startup
Continuous, no damage (output shorted to ground) Converter will start up if the external output voltage is less than Vset
Dynamic Load Response 75 Sec max. to within 2% of final value (50-100% load step, di/dt=2.5A/Sec)
Environmental
Operating Temperature Range (Ambient) See derating curves -40 to +85 C. with derating (Note 9) Operating PC Board Temperature -40 to +100 C. max., no derating (12) Storage Temperature Range -55 to +125 C. Thermal Protection/Shutdown +130 C. Relative Humidity to 85%RH/+85 C., non-condensing
Physical
Outline Dimensions Weight Electromagnetic Interference
Current Tracking/Sequencing Slew Rate Tracking accuracy, rising input Tracking accuracy, falling input
Restriction of Hazardous Substances MSL Rating
See Mechanical Specifications 0.1 ounces (2.8 grams) Designed to meet FCC part 15, class B, EN55022 and CISPR22 class B radiated (may need external filter) RoHS-6 (does not claim EU RoHS exemption 7b-lead in solder) 2
Absolute Maximum Ratings
General and Safety
Efficiency Switching Frequency
See Ordering Guide 300 KHz 25 kHz
Start-Up Time (Vin on to Vout regulated) 8 mSec for Vout=nominal (On/Off to Vout regulated) 8 mSec for Vout=nominal Isolation Not isolated Safety Calculated MTBF Meets UL/cUL 60950-1, CSA-C22.2 No. 60950-1, IEC/EN 60950-1 See table on page 17.
Output
Input Voltage (Continuous or transient) On/Off Control Input Reverse Polarity Protection Output Current (Note 7)
Storage Temperature Lead Temperature
0 V.to +15 Volts max. (D12 models) 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 C. See soldering specifications
Output Voltage Range Minimum Loading Accuracy (50% load, untrimmed) 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
0.7525 to 5.5 V No minimum load 2 % of Vnominal None 0.02% per oC of Vout range See Ordering Guide and note 8 See Ordering Guide and note 10 1,000 F 5,000 F 27 Amps (T/10); 33 Amps (T/16)
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 (+12V. for D12 models), Vout=nominal (+5V for D12 models), full load, external caps and natural convection unless otherwise indicated. Extended tests at higher power must supply substantial forced airflow. All models are tested and specified with external 1 F paralleled with 10 F ceramic/tantalum output capacitors and a 22 F external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. However, Murata Power Solutions recommends installation of these capacitors. All models are stable and regulate within spec under no-load conditions. (2) (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. Deleted
2A Hiccup autorecovery upon overload removal. (Note 17)
(4)
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MDC_OKY_T10T16.D12.A05_long Page 4 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Specification Notes, Cont.:
(5) The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced to -Input Common. A logic gate may also be used by applying appropriate external voltages which not exceed +Vin. Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Deleted. 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. All models are fully operational and meet published specifications, including "cold start" at -40C.
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.
(6) (7) (8)
(9)
Reflow Solder Operations for surface-mount products (SMT)
(10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) Other input or output voltage ranges will be reviewed under scheduled quantity special order. (12) Maximum PC board temperature is measured with the sensor in the center of the converter. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external output capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will reduce output noise but may change the transient response. Newer ceramic caps with very low ESR may require lower capacitor values to avoid instability. Thoroughly test your capacitors in the application. Please refer to the Output Capacitive Load Application Note. (15) Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times. Otherwise, you risk having the converter turn off. The undervoltage shutdown is not latching and will attempt to recover when the input is brought back into normal operating range. (16) The output is not intended to sink appreciable reverse current. (17) "Hiccup" overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation.
For Sn/Ag/Cu based solders: Preheat Temperature Time over Liquidus Maximum Peak Temperature Cooling Rate For Sn/Pb based solders: Preheat Temperature Time over Liquidus Maximum Peak Temperature Cooling Rate Less than 1 C. per second 60 to 75 seconds 235 C. Less than 3 C. per second Less than 1 C. per second 45 to 75 seconds 260 C. Less than 3 C. per second
Recommended Lead-free Solder Reflow Profile
250 Peak Temp. 235-260 C
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. OKY2-T/10-D12, -T/16-D12
Output Voltage 5.0 V. 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) 1.472 3.122 5.009 7.416 9.024 13.05 22.46 41.424 (open)
200
Temperature (C)
150 Soaking Zone 120 sec max 100 <1.5 C/sec 50 240 sec max
Reflow Zone time above 217 C 45-75 sec
Preheating Zone
0 0 30 60 90 120 150 Time (sec) 180 210 240 270 300
High trace = normal upper limit Low trace - normal lower limit
Resistor Trim Equation, D12 models: 10500 RTRIM (:) = _____________ -1000 VOUT - 0.7525V
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MDC_OKY_T10T16.D12.A05_long Page 5 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp 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. We recommend a time delay fuse installed in the ungrounded input supply line with a value which is approximately twice the maximum line current, calculated at the lowest input voltage. Please refer to the Specifications. 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
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.
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_OKY_T10T16.D12.A05_long Page 6 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp 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_OKY_T10T16.D12.A05_long Page 7 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp 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. 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. [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_OKY_T10T16.D12.A05_long Page 8 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA - OKY2-T/10-D12
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 0.7525V)
84 85
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1V)
79
80 VIN = 8.3V VIN = 12V VIN = 14V VIN = 8.3V VIN = 12V VIN = 14V
Efficiency (%)
Efficiency (%)
74
75
69
70
64 65 59 60 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 Load Curre nt (Amps)
54 Load Curre nt (Amps)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.2)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.5V)
85
86
80 Efficiency (%)
75
Efficiency (%)
VIN = 8.3V VIN = 12V VIN = 14V
81
VIN = 8.3V VIN = 12V VIN = 14V
76
70
71
65 1 2 3 4 5 6 7 8 9 10 Load Curre nt (Amps)
66 1 2 3 4 5 6 7 8 9 10 Load Curre nt (Amps)
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.8)
90 88 86 Efficiency (%) 84 82 80 78 76 74 72 1 2 3 4 5 6 7 8 9 10 Load Curre nt (Amps) VIN = 8.3V VIN = 12V VIN = 14V 93 91 89 87 Efficiency (%) 85 83 81 79 77 75 1
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 2.5V)
VIN = 8.3V VIN = 12V VIN = 14V
2
3
4
5
6
7
8
9
10
Load Curre nt (Amps)
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MDC_OKY_T10T16.D12.A05_long Page 9 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA - OKY2-T/10-D12
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 3.3V)
93 91 89 Efficiency (%) 87 85 83 81 79 77 75 1 2 3 4 5 6 7 8 9 10 Load Curre nt (Amps) 75 1 2 3 4 5 6 7 8 9 10 Load Curre nt (Amps) 80 VIN = 8.3V VIN = 12V VIN = 14V 90 Efficiency (%) VIN = 8.3V VIN = 12V VIN = 13.2V 95
OKY2-T/10-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 5V)
85
OKY2-T/10-D12-C Maximum Current Temperature Derating at Sea Level (VIN= 12V, VOUT = 0.75 to 5V).
11 10 9 Output Current (Amps) 8 7 6 5 4 3 2 1 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (C) Natural convection
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MDC_OKY_T10T16.D12.A05_long Page 10 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS - OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 0.7525V)
84
17 16 Output Current (Amps) 15 14 13 12 Natural convection 100 LFM 200 LFM 300 LFM 400 LFM
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level (VIN= 12V, VOUT = 0.75V).
79
74 Efficiency (%)
VIN = 8.3V VIN = 12V VIN = 14V
69
64
59
11
54 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Load Curre nt (Amps)
10 20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (C)
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1V)
85 85 80 VIN = 8.3V VIN = 12V VIN = 14V 80 Efficiency (%)
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.2)
Efficiency (%)
75
VIN = 8.3V VIN = 12V VIN = 14V
75
70
65
70
60 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Load Curre nt (Amps)
65 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Load Curre nt (Amps)
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.5V)
86
Efficiency (%)
81
VIN = 8.3V VIN = 12V VIN = 14V
76
71
66 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Load Curre nt (Amps)
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MDC_OKY_T10T16.D12.A05_long Page 11 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS - OKY2-T/16-D12
On/Off Enable Startup Delay (Vin=8.3V, Vout=1.5V, Iout=16A, Cload=0) Trace 4=Enable In, Trace2=Vout Output Ripple and Noise (Vin=12V, Vout=1.5V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=1.5V, Cload=0, Iout=8A to 16A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=1.5V, Cload=0, Iout=16A to 8A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 1.8)
90 88
16 17
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level (VIN= 12V, VOUT = 1.8V).
86 Efficiency (%) 84 82 80 78 76 74 72 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (C)
VIN = 8.3V VIN = 12V VIN = 14V
Output Current (Amps)
15 14 13 12 11 Natural convection 100 LFM 200 LFM 300 LFM 400 LFM
Load Curre nt (Amps)
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_OKY_T10T16.D12.A05_long Page 12 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS - OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 2.5V)
93 91 89 87 Efficiency (%) 85 83 81 79 77 75 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Load Curre nt (Amps) VIN = 8.3V VIN = 12V VIN = 14V
On/Off Enable Startup Delay (Vin=8.3V, Vout=2.5V, Iout=16A, Cload=0) Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=2.5V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=2.5V, Cload=0, Iout=8A to 16A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=2.5V, Cload=0, Iout=16A to 8A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
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MDC_OKY_T10T16.D12.A05_long Page 13 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS - OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 3.3V)
93 91
Output Current (Amps) 17 16 15 14 13 12 11 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (C) Natural convection 100 LFM 200 LFM 300 LFM 400 LFM
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level (VIN= 12V, VOUT = 3.3V).
89 Efficiency (%) 87 85 83 81 79 77 75 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Load Curre nt (Amps) VIN = 8.3V VIN = 12V VIN = 14V
On/Off Enable Startup Delay (Vin=8.3V, Vout=3.3V, Iout=16A, Cload=0) Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=3.3V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=3.3V, Cload=0, Iout=8A to 16A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=3.3V, Cload=0, Iout=16A to 8A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
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MDC_OKY_T10T16.D12.A05_long Page 14 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
PERFORMANCE DATA AND OSCILLOGRAMS - OKY2-T/16-D12
OKY2-T/16-D12 Efficiency vs. Line Voltage and Load Current @ +25C (VOUT = 5V)
95
17 16
OKY2-T/16-D12-C Maximum Current Temperature Derating at Sea Level (VIN= 12V, VOUT = 5V)
90 Efficiency (%)
VIN = 8.3V VIN = 12V VIN = 13.2V
Output Current (Amps)
15 14 Natural convection 100 LFM 200 LFM 300 LFM 400 LFM
85
13 12 11
80
75 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (C)
Load Curre nt (Amps)
On/Off Enable Startup Delay (Vin=8.3V, Vout=5V, Iout=16A, Cload=0) Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=5V, Iout=16A, Cload=0, ScopeBW=100MHz)
Step Load Transient Response (Vin=12V, Vout=5V, Cload=0, Iout=8A to 16A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
Step Load Transient Response (Vin=12V, Vout=5V, Cload=0, Iout=16A to 8A) Trace 2=Vout, 100 mV/div., Trace4=Iout, 5A/div.
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MDC_OKY_T10T16.D12.A05_long Page 15 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
TAPE & REEL IMFORMATION
FEED (UNWIND) DIRECTION ------2.00 .079 (P/U) 18.19 .716 (P/U) 40.40 1.591 9.14 .360 4.00 .157
PIN #1
ROUND HOLES 1.75 .069
44.00 1.732
2.00 .079 24.00 .945
KEY IN POCKET
OBLONG HOLES
TOP COVER TAPE
THIRD ANGLE PROJECTION
.53 REF
101.6 4.00 (CORE)
44.0 1.73 REF
PIN #1 THIS CORNER (FARSIDE)
.50
330.2 13.00
PICKUP NOZZLE LOCATION ( 3-6mm)
1.30 REF
13.00 .512
.27
REEL INFORMATION (250 UNITS PER REEL)
PICK & PLACE PICKUP (P/U)
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MDC_OKY_T10T16.D12.A05_long Page 16 of 17
OKY-T/10 & T/16-D12 Series
Programmable DOSA-SMT 10/16-Amp DC/DC Converters
Product Label Because of the small size of these products, the product label contains a character-reduced code to indicate the model number and manufacturing date code. Not all items on the label are always used. Please note that the label differs from the product photograph. Here is the layout of the label:
Model Number OKY-T/10-D12P-C OKY-T/10-D12N-C OKY2-T/10-D12P-C OKY2-T/10-D12N-C
Mfg. date code Y01110 YMDX Rev. Product code Revision level
Product Code Y01110 Y00110 Y21110 Y20110 Y01116 Y00116 Y21116 Y20116
OKY-T/16-D12P-C OKY-T/16-D12N-C OKY2-T/16-D12P-C OKY2-T/16-D12N-C
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
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
Mean Time Before Failure (MTBF) Table These figures use a standard MTBF probability calculation as an indication of component parts stress and life derating. The calculaton is based on separate MTBF values for all internal parts in addition to stated environmental conditions. Two MTBF values are presented. The Telcordia method is widely used in industry, particularly telecom. The United States MIL-HDBK method is for military and industrial applications. Please refer to a qualified reliability engineer for more background.
Model Number OKY2-T/16-D12N-C OKY2-T/16-D12N-C MTBF (Hours) 7,027,574 5,506,128 Method [1,2] Telcordia MIL-HDBK
[2] Notes: [1] Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ISSUE 2, ground fixed controlled conditions, Tambient=+25C, full output load, natural air convection. Mean Time Before Failure is calculated using MIL-HDBK-217FN2, GB ground benign, Tambient=+25C, full output load, natural air convection.
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. (c) 2009 Murata Power Solutions, Inc.
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