OKL2-T/12-W5 Series www.murata-ps.com Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series Typical unit FEATURES PRODUCT OVERVIEW iLGA inspectable Land Grid Array The OKL2-T/12-W5 series are miniature nonisolated point-of-Load(PoL) DC-DC power Converters for embedded applications. The tiny form factor is configured on a Land Grid Array (LGA) assembly measuring only 0.8 x 0.45 x0.34 inches (20.32 x 11.43 x 8.55 mm). Applications include powering CPU’s, datacom/telecom systems, distributed bus architectures (DBA), programmable logic and mixed voltage systems. 2.4-5.5Vdc input voltage range Programmable output voltage from 0.6-3.63Vdc Drives 1000μF ceramic capacitive loads High power conversion efficiency at 94% Outstanding thermal derating performance Over temperature and over current protection The wide input range is 2.4 to 5.5Volts DC. The maximum output current is 12Amps. 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. These converters also include under voltage lock out (UVLO), output short circuit protection, overcurrent and over temperature protections. On/Off control RoHS-6 hazardous substance compliance Optional Sequence/Tracking operation Connection Diagram +Vin F1 +Vout t4XJUDIJOH On/Off Control Controller t'JMUFST t$VSSFOU4FOTF External DC Power Source Trim Reference and Error Amplifier Open = On Closed = Off (Positive On/Off) Common Common 4FRVFODF5SBDLJOH Power Good Figure 1. OKL2-T/12-W5 Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifications. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 1 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series OKL-T/12-W5P-C OKL-T/12-W5N-C OKL2-T/12-W5P-C OKL2-T/12-W5N-C ➀ ➁ Input R/N Regulation (max.) Vout Iout (Amps, Power Vin nom. (mV p-p) (Volts) ➀ max.) ➁ (Watts) (Volts) Load Max. ➃ Line 0.6-3.63 12 39.6 30 The output range is limited by Vin. See detailed specs. All specifications are at nominal line voltage, Vout=nominal (3.3V) and full load, +25°C. unless otherwise noted. ±0.6% ±0.25% 5 Efficiency (%) Range Iin, no load Iin, full load (Volts) ➃ (mA) ➃ (Amps) ➁ 2.4-5.5 30 8.43 Min. Typ. 91.5 Pos. Neg. 94.0 Pos. Neg. Seq/ Track Output Model Number On/Off Logic PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Dimensions Inches (mm) no no 0.8 x 0.45 x 0.34 yes (20.32 x 11.43 x 8.55) yes ➂ Use adequate ground plane and copper thickness adjacent to the converter. Ripple and Noise (R/N) and no-load input current are shown at Vout=1V. See specs for details. Output capacitors are 94 μF ceramic. Input cap is 22 μF. See detailed specifications. I/O caps are necessary for our test equipment and may not be needed for your application. PART NUMBER STRUCTURE OK L 2 - T / 12 - W5 N - C Okami Non-isolated PoL LGA Surface Mount Sequence/tracking Blank = Not Installed 2 = installed Trimmable Output Voltage Range 0.6 - 3.63Vdc Maximum Rated Output Current in Amps RoHS Hazardous Substance Compliance C = RoHS-6 (does not claim EU RoHS exemption 7b – lead in solder) On/Off Logic P = Positive Logic N = Negative Logic Input Voltage Range 2.4 - 5.5Vdc 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 OKL-T/12-W5P-C OKL-T/12-W5N-C OKL2-T/12-W5P-C OKL2-T/12-W5N-C Product Code L01012 L00012 L21012 L20012 The manufacturing date code is four characters: Mfg. date code XXXXXX Product code YMDX Rev. Revision level Figure 2. Label Artwork Layout The label contains two rows of information: First character – Last digit of manufacturing year, example 2009 Second character – Month code (1 through 9 = Jan-Sep; O, N, D = Oct, Nov, Dec) Third character – Day code (1 through 9 = 1 to 9, 10 = 0 and 11 through 31 = A through Z) Fourth character – Manufacturing information First row – Model number product code (see table) Second row – Manufacturing date code and revision level www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 2 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series FUNCTIONAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Output Power Output Current Conditions (1) Full power operation Current-limited, no damage, short-circuit protected Minimum 0 0 0 Typical/Nominal Maximum 6 43.56 Units Vdc W 12 A On/Off Control 5.5 Vdc Storage Temperature Range Vin = Zero (no power) -55 125 ˚C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied or recommended. INPUT Operating voltage range (7) See output voltage vs input voltage 2.4 5 5.5 Vdc Recommended External Fuse Fast blow 28 A Turn On/Start-up threshold Rising input voltage 1.95 2.05 2.15 Vdc Undervoltage Shutdown 1.8 1.92 2.07 Internal Filter Type C-TYPE Input current Full Load Conditions Vin = nominal (3.3Vo set) 8.43 8.69 A Low Line Vin @ min, 3.3 Vout 9.33 9.71 A Inrush Transient TBD A2-Sec. Short Circuit Input Current TBD mA No Load Input Current 3.3Vout, Iout @ 0 45 60 mA No Load Input Current 1.2V, Iout @ 0 35 50 Shut-Down Mode Input Current 1 mA Reflected (back) ripple current (2) Measured at input with specified filter TBD mA, pk-pk GENERAL and SAFETY @ Vin nom, 3.63Vout 92.5 94.7 @ Vin nom, 3.3Vout 91.5 94 @ Vin min=4.5Vin, 3.3Vout 92 94.3 EFFICIENCY (12Vin @ 12A load current) % @ Vin nom, 2.5Vout 88.5 91.6 @Vin nom, 1.8Vout 84.5 89 @Vin nom, 1.2Vout 81.5 85.4 Certified to UL-60950-1, CSA-C22.2 Safety No.60950-1, IEC/60950-1, 2nd edition Yes (pending) Per Telcordia SR332, issue 1 class 3, ground Calculated MTBF (4a) 10,488,000 Hours fixed, Tambient=+25˚C Calculated MTBF (4b) Per Mil-HDBK-217N2 Method 6,071,542 Hours DYNAMIC CHARACTERISTICS Fixed Switching Frequency 600 KHz Startup Time Power On to Vout regulated 6 mS Startup Time Remote ON to to Vout regulated 6 mS 50-100-50% load step, settling time to within Dynamic Load Response 50 μSec ±2% of Vout di/dt =1 A/μSec Dynamic Load Peak Deviation same as above ±300 mV FEATURES and OPTIONS Remote On/Off Control (5) “N” suffix Negative Logic, ON state Pin open=ON -0.2 Vin-1.7 V Negative Logic, OFF state Vin-0.7 +Vin-max V Control Current open collector/drain 3 mA “P” suffix Positive Logic, ON state Pin open=ON +Vin-0.7V Vin-max V Positive Logic, OFF state -0.3 0.8 V Control Current open collector/drain 3 mA Tracking/Sequencing(optional) Slew Rate 2 V/mS Tracking Accuracy Rising input (0.5V/ms) ±150 mV Tracking Accuracy Falling input(0.5V/ms) ±100 mV Power Good Option PGOOD, Open Drain Configuration, Sinking: Vout window for PGOOD: True -10% 10% Vset Vout window for PGOOD: False 0.05 Vdc Remote Sense 500 mV www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 3 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series FUNCTIONAL SPECIFICATIONS (CONT.) OUTPUT Total Output Power Voltage Nominal Output Voltage Range (13) Setting Accuracy Output Voltage Overshoot-Startup Current Output Current Range Minimum Load Current Limit Inception (6) Short Circuit Short Circuit Current (17) Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation (10) Total Regulation Band Line Regulation Load Regulation 0 See trim formula At 50% load 39.6 0.6 -1.5 0 98% of Vnom., after warmup 12.2 12 No minimum load 22 Hiccup technique, autorecovery within ±1% of Vout 0.02 Output shorted to ground, no damage Continuous 43.56 W 3.63 1.5 3 Vdc % of Vnom. % Vo set 12 A A A Current limiting -2.5 Vin=min. to max. Vout=nom. Iout=min. to max. 3.3Vo, 12Vin 2.5Vo, 12Vin 1.8Vo, 12Vin 0.69Vo, 7Vin At all outputs Low ESR; >0.001, <0.01 ohm ESR > 0.01 ohm Ripple and Noise (8) Temperature Coefficient Maximum Capacitive Loading (14) Vo set 2.5 ±0.6 ±0.25 100 100 100 100 30 30 30 15 ±0.02 94 MECHANICAL Outline Dimensions 1000 5000 % Vo set % % mV pk-pk % of Vnom./°C μF μF 0.8 x 0.45 x 0.34 20.32 x 11.43 x 8.55 0.1 2.78 Weight Inches mm Ounces Grams ENVIRONMENTAL Operating Ambient Temperature Range (9) Storage Temperature Thermal Protection/Shutdown RoHS rating full power, all output voltages, see derating curves Vin = Zero (no power) Measured in center -40 85 ˚C -55 125 ˚C ˚C TBD RoHS-6 Notes (1) Specifications are typical at +25°C, Vin = nominal (+5V), Vout = nominal (+3.3V), full load, external caps and low frequency components which exceed the ripple specification. The output may be operated indefinitely with natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced (9) input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a 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) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin = 2 x 100 μF ceramic, Cbus = 1000 μF electrolytic, Lbus = 1 μH. (3) no load. airflow. All models are tested and specified with external 2×47μF ceramic output capacitors and a 22 μF external 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, ground fixed conditions, Tpcboard = +25 ˚C, full output load, natural air convection. (4b) Mean Time Before Failure is calculated using the MIL-HDBK-217N2 method, ground benign, +25oC., full output load, natural convection. All models are fully operational and meet published specifications, including “cold start” at –40˚ C. 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 Technical 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. (5) The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced to (6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) Please observe the voltage input and output specifications in the voltage range graph. prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers (8) Output noise may be further reduced by adding an external filter. At zero output current, the output may contain normal operation. -Input Common. A logic gate may also be used by applying appropriate external voltages which do not exceed +Vin. (16) The outputs are not intended to sink appreciable reverse current. (17) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 4 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series OKL2-T/12-W5 PERFORMANCE DATA AND OSCILLOGRAMS Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 3.3V) 100 Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=3.3V) 14 12 VIN = 4.5V VIN = 5V VIN = 5.5V 90 Output Current (Amps) Efficiency (%) 95 85 80 Natural Convection 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 10 8 6 4 2 0 75 0 2 4 6 8 10 12 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 Delay (Vin=5.0V, Vout=3.3V, Iout=12A, Cload=94μF) Trace2=Enable, Trace1=Vout Step Load Transient Response (Vin=5.0V, Vout=3.3V, Cload=94μF, Iout=6A to 12A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. Output Ripple and Noise (Vin=5.0V, Vout=3.3V, Iout=12A, Cload=94μF, ScopeBW=20MHz) Step Load Transient Response (Vin=5.0V, Vout=3.3V, Cload=94μF, Iout=12A to 6A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 5 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series OKL2-T/12-W5 PERFORMANCE DATA AND OSCILLOGRAMS Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 2.5V) 100 Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=2.5V) 14 12 VIN = 3V VIN = 5V VIN = 5.5V 90 Output Current (Amps) Efficiency (%) 95 85 80 Natural Convection 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 10 8 6 4 2 0 75 0 2 4 6 8 10 12 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 Delay (Vin=5.0V, Vout=2.5V, Iout=12A, Cload=94μF) Trace2=Enable, Trace1=Vout Step Load Transient Response (Vin=5.0V, Vout=2.5V, Cload=94μF, Iout=6A to 12A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. Output Ripple and Noise (Vin=5.0V, Vout=2.5V, Iout=12A, Cload=94μF, ScopeBW=20MHz) Step Load Transient Response (Vin=5.0V, Vout=2.5V, Cload=94μF, Iout=12A to 6A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 6 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series OKL2-T/12-W5 PERFORMANCE DATA AND OSCILLOGRAMS Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 1.8V) 100 Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=1.8V) 14 12 90 Output Current (Amps) Efficiency (%) 95 VIN = 2.4V VIN = 3.3V VIN = 5.5V 85 80 Natural Convection 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 10 8 6 4 2 0 75 0 2 4 6 8 10 12 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 Delay (Vin=5.0V, Vout=1.8V, Iout=12A, Cload=94μF) Trace2=Enable, Trace1=Vout Step Load Transient Response (Vin=5.0V, Vout=1.2V, Cload=94μF, Iout=6A to 12A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. Output Ripple and Noise (Vin=5.0V, Vout=1.8V, Iout=12A, Cload=94μF, ScopeBW=20MHz) Step Load Transient Response (Vin=5.0V, Vout=1.2V, Cload=94μF, Iout=12A to 6A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 7 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series OKL2-T/12-W5 PERFORMANCE DATA AND OSCILLOGRAMS Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 1.2V) 95 Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=1.2V) 14 12 Output Current (Amps) Efficiency (%) 90 VIN = 2.4V VIN = 3.3V VIN = 5.5V 85 80 75 Natural Convection 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 10 8 6 4 2 0 70 0 2 4 6 8 10 12 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 Delay (Vin=12V, Vout=1.2V, Iout=12A, Cload=94μF) Trace2=Enable, Trace1=Vout Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=94μF, Iout=6A to 12A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. Output Ripple and Noise (Vin=12V, Vout=1.2V, Iout=12A, Cload=94μF, ScopeBW=20MHz) Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=94μF, Iout=12A to 6A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 8 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series OKL2-T/12-W5 PERFORMANCE DATA AND OSCILLOGRAMS Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 0.6V) 95 Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=0.6V) 14 12 Output Current (Amps) Efficiency (%) 90 85 VIN = 2.4V VIN = 3.3V VIN = 5.5V 80 75 Natural Convection 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 10 8 6 4 2 0 70 0 2 4 6 8 10 12 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 Delay (Vin=5V, Vout=0.6V, Iout=12A, Cload=94μF) Trace2=Enable, Trace1=Vout Step Load Transient Response (Vin=5V, Vout=0.6V, Cload=94μF, Iout=6A to 12A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. Output Ripple and Noise (Vin=5V, Vout=0.6V, Iout=12A, Cload=94μF, ScopeBW=20MHz) Step Load Transient Response (Vin=5V, Vout=0.6V, Cload=94μF, Iout=12A to 6A) Trace 1=Vout, 100 mV/div, Trace 4=Iout, 5A/div. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 9 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series MECHANICAL SPECIFICATIONS 4 11.43 5 18.80 2.44×1.73×10PLACES 6 10.16 3 7 10 8 2 1 5.72 1.27 Y 20.32 19.05 14.48 10.41 X 6.35 0 TOP VIEW 1.52 9 UNIT[mm] BOTTOM VIEW [ Tolerances ±0.25mm] Figure 3. OKL2-T/12-W5 Mechanical Outline 8.55max SIDE VIEW SOLDER PAD NOTES: [1] To avoid incorrect contacts with exposed vias and plated through holes on the bottom of the converter, do not have any exposed copper in the center area of the host PCboard (see drawing). Except for connections to the pads, keep all external circuits away from the board edges. [2] Do not connect any additional components between the Trim pin and Vout or between the Trim and Sense pins. Use only the specified connections. INPUT/OUTPUT CONNECTIONS Pin Function 1 On/Off Control* 2 VIN 3 Sequence/Tracking 4 Ground 5 Trim 6 VOUT 7 +Sense (VOUT) 8 -Sense (Ground) 9 N.C. 10 N.C. *The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) logic. Dimensions are in inches (mm shown for ref. only). Third Angle Projection Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 1˚ Components are shown for reference only. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 10 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series RECOMMENDED LAYOUT Dimensions are in inches (mm shown for ref. only). Third Angle Projection Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 1˚ Components are shown for reference only. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 11 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series TAPE AND REEL INFORMATION (MSL RATING 2) B -B ’ SE C T I O N Tape Detail Vacuum Pickup Point in Center A -A ’ SECTION Pulling direction Reel Detail Reel Information (250 units per reel) Key A B C Description Tape trailer (no modules) Pocket tape length before modules Cover tape length before pocket tape Length (mm) 240±40 180 min 240±40 www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 12 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series TECHNICAL NOTES Output Voltage Adustment 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,±0.5% accuracy or better with low temperature coefficient, ±100 ppm/degC. or better. Mount the resistor close to the converter with very short leads or use a surface mount trim resistor. In the table below, the calculated resistance is given. Do not exceed the specified limits of the output voltage or the converter’s maximum power rating when applying these resistors. Also, avoid high noise at the Trim input. However, to prevent instability, you should never connect any capacitors to Trim. OKL2-T/12-W5 Output Voltage Calculated Rtrim (KΩ) 3.3 V 0.444 2.5 V 0.63 1.8 V 1.00 1.5 V 1.33 1.2 V 2.00 1.0 V 3.00 0.6 V ∞ (open) Resistor Trim Equation, OKL2-T/12-W5 models: 1.2 RTRIM (kΩ) = ________ VOUT – 0.6 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. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, converters will not begin to regulate properly until the ramping-up input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifications). Once operating, converters will not turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the input voltage rises again above the Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage. Users should be aware however of input sources near the Under-Voltage Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. Start-Up Time Assuming that the output current is set at the rated maximum, the Vin to Vout Start-Up Time (see Specifications) is the time interval between the point when the ramping input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. These converters include a soft start circuit to moderate the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. The On/Off Remote Control interval from On command to Vout regulated assumes that the converter already has its input voltage stabilized above the Start-Up Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specified accuracy band. The specification assumes that the output is fully loaded at maximum rated current. Similar conditions apply to the On to Vout regulated specification such as external load capacitance and soft start circuitry. 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 44 μF, rated at twice the expected maximum input voltage. Make sure that the input terminals do not go below the under voltage shutdown voltage at all times. More input bulk capacitance may be added in parallel (either electrolytic or tantalum) if needed. 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 94 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. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 13 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series 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 will vary according to the specific converter model. TO OSCILLOSCOPE Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that very low flow rates (below about 25 LFM) are similar to “natural convection”, that is, not using fan-forced airflow. Murata makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. CURRENT PROBE +VIN VIN LBUS + – + – CBUS CIN CAUTION: These graphs are all collected at slightly above Sea Level altitude. Be sure to reduce the derating for higher density altitude. -VIN CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz CBUS = 1000μF, ESR < 100mΩ @ 100kHz LBUS = 1μH Output Voltage Sequencing The OKL modules include a sequencing feature that enables users to implement various types of output voltage sequencing in their applications. This is accomplished via an additional sequencing pin. When not using the sequencing feature, either tie the sequence pin to Vin or leave it unconnected. Figure 4. Measuring Input Ripple Current +VOUT Cext SCOPE Temperature Derating Curves The graphs in this data sheet illustrate typical operation under a variety of conditions. The derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airflow measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in current or reduced airflow as long as the average is not exceeded. RLOAD -VOUT Figure 5. Measuring Output Ripple and Noise (PARD) The capacitor Cext value is found on the electrical data page. 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-DCs to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. When the temperature decreases below the turn-on threshold, the converter will automatically restart. When an analog voltage is applied to the sequence pin, the output voltage tracks this voltage until the output reaches the set-point voltage. The final value of the sequence voltage must be set higher than the setpoint voltage of the module. The output voltage follows the voltage on the sequence pin on a one-to-one volt basis. By connecting multiple modules together, multiple modules can track their output voltages to the voltage applied on the sequence pin. For proper voltage sequencing, first, input voltage is applied to the module. The On/Off pin of the module is left unconnected (or tied to GND for negative logic modules or tied to Vin for positive logic modules) so that the module is ON by default. After applying input voltage to the module, a minimum 10msec delay is required before applying voltage on the sequence pin. During this time, a voltage of 50mV (± 20 mV) is maintained on the sequence pin. This delay gives the module enough time to complete its internal powerup soft-start cycle. During the delay time, the sequence pin should be held close to ground (nominally 50mV ± 20 mV). This is required to keep the internal opamp out of saturation thus preventing output overshoot during the start of the sequencing ramp. By selecting resistor R1 according to the following equation 23500 R1 = ———— ohms, Vin – 0.05 the voltage at the sequencing pin will be 50mV when the sequencing signal is at zero. See figure 6 for R1 connection for the sequencing signal to the SEQ pin. 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. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 14 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series 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. 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 magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart, causing the output voltage to begin ramping up to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initiate. This rapid on/off cycling is called “hiccup OKL P Module +Vin +Vin R1 On/Off PWM Q1 GND Figure 6. On/Off Circuit Control for Using Positive On/Off Logic OKL N Module +Vin E PWM Rp On/Off Q3 Q1 GND Remote On/Off Control The OKL Series power modules can be specified with either a positive or negative logic type. See Figures 6 and 7 for On/Off circuit control. In the positive logic on/off option the unit turns on during a logic high on the On/Off pin and turns off during a logic low. In a negative logic on/off option, the unit turns off during logic high and on during logic low. The On/Off signal should always be reference to ground. For positive or negative option, leaving then On/Off pin disconnected will turn the unit on when input voltage is present. Positive—Units are enabled when the on/off pin is left open or is pulled high to +Vin. The On/Off circuit control is shown in figure 6. When the external transistor Q1 is in the off state, the internal PWM enable pin is pull high causing the unit to turn on. When Q1 is turn on, the On/Off pin is pulled low and the units is off. Rp should be around 3KΩ. Dynamic control of the On/Off function should be able to sink the specified 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. GND BOM Rp 3KΩ BOM Q1 Q SMT MOS P 30V +Vin The “hiccup” system differs from older latching short circuit systems because you do not have to power down the converter to make it restart. The system will automatically restore operation as soon as the short circuit condition is removed. Negative—Units are enabled when the ON/Off is open or brought to within a low voltage (see specifications) with respect to –Vin. The unit is off when the ON/Off is pulled high with respect to –Vin (see specifications). The On/Off circuitry is shown in figure 7. The On/Off pin should be pulled high with an external pull-up resistor (3KΩ). When Q1 is in the off state, the On/ Off pin is pulled high, transistor Q3 is turn on and the unit is off. To turn on the unit, Q1 is turn on, pulling the On/Off pin low and turning Q3 off resulting on the unit being on. E Rp 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. GND Output Capacitive Load These converters do not require external capacitance added to achieve rated specifications. Users should only consider adding capacitance to reduce switching noise and/or to handle spike current load steps. Install only enough capacitance to achieve noise objectives. Excess external capacitance may cause regulation problems, degraded transient response and possible oscillation or instability. GND BOM Rp 3KΩ BOM Q1 Q SMT MOS P 30V Figure 7. On/Off Circuit Control for Using Negative On/Off Logic www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 15 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series Input Voltage (V) Voltage Range Graph Please observe the limits below for voltage input and output ranges. These limits apply at all output currents (Ta = 25°C). 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Vin=2.4V / Vout=1.8V 0 0.5 1 Upper Limit Lower Limit 1.5 2 2.5 Output Voltage (V) 3 3.5 4 Figure 8. Voltage Range Graph Soldering Guidelines Recommended Lead-free Solder Reflow Profile 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. Preheat Temperature Less than 1 ºC. per second Time over Liquidus 45 to 75 seconds Maximum Peak Temperature 260 ºC. Cooling Rate Less than 3 ºC. per second 200 Temperature (°C) Reflow Solder Operations for surface-mount products (SMT) For Sn/Ag/Cu based solders: Peak Temp. 235-260° C 250 Reflow Zone 150 Soaking Zone time above 217° C 45-75 sec 120 sec max 100 <1.5° C/sec High trace = normal upper limit Low trace = normal lower limit Preheating Zone 50 240 sec max 0 For Sn/Pb based solders: 0 Preheat Temperature Less than 1 ºC. per second Time over Liquidus 60 to 75 seconds Maximum Peak Temperature 235 ºC. Cooling Rate Less than 3 ºC. per second 30 60 90 120 150 180 210 240 270 300 Time (sec) CAUTION: Do not reflow the DC-DC converter as follows, because the DC-DC converter may fall from the substrate during reflowing. Substrate DC-DC Converter www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 16 of 17 OKL2-T/12-W5 Series Programmable Output 12-Amp iLGA SMT PoL DC-DC Converter Series Vertical Wind Tunnel IR Transparent optical window Unit under test (UUT) Variable speed fan Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate airflow and heat dissipation analysis of power products. The system includes a precision low flow-rate anemometer, variable speed fan, power supply input and load controls, temperature gauges, and adjustable heating element. The IR camera monitors the thermal performance of the Unit Under Test (UUT) under static steady-state conditions. A special optical port is used which is transparent to infrared wavelengths. IR Video Camera Heating element Precision low-rate anemometer 3” below UUT Ambient temperature sensor Airflow collimator Both through-hole and surface mount converters are soldered down to a 10" x 10" host carrier board for realistic heat absorption and spreading. Both longitudinal and transverse airflow studies are possible by rotation of this carrier board since there are often significant differences in the heat dissipation in the two airflow directions. The combination of adjustable airflow, adjustable ambient heat, and adjustable Input/Output currents and voltages mean that a very wide range of measurement conditions can be studied. The collimator reduces the amount of turbulence adjacent to the UUT by minimizing airflow turbulence. Such turbulence influences the effective heat transfer characteristics and gives false readings. Excess turbulence removes more heat from some surfaces and less heat from others, possibly causing uneven overheating. Both sides of the UUT are studied since there are different thermal gradients on each side. The adjustable heating element and fan, built-in temperature gauges, and no-contact IR camera mean that power supplies are tested in real-world conditions. Figure 9. Vertical Wind Tunnel Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2016 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_OKL2-T/12-W5.B02 Page 17 of 17