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$ the okx-t/10 and -t/16 series are miniature sip non-isolated point-of-load (pol) switch mode dc/dc power converters for embedded applications. the module is fully compatible with distributed-power open standards alliance (dosa) industry-standard speci? cations (www.dosapower.com). applications include powering cpus, datacom/telecom systems, distributed bus architectures (dba), 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 ? xed-frequency synchronous buck converter switching topology, the high power conversion ef? cient point of load (pol) module features programmable output voltage and on/off control. an optional sequence/track 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 tempera- ture protections. these units are designed to meet all standard ul/en/iec 60950-1 safety and fcc emi/rfi emissions certi? cations and rohs6 hazardous substance compliance. product overview figure 1. okx2-t/10, -t/16 connection diagram note: murata power solutions strongly recommends an external input fuse, f1. see speci? cations. external dc power source f1 on/off control common common sequence/track (optional) open = on closed = off +vin +vout trim sense controller reference and error ampli?er t4xjudijoh t'jmufst t$vssfou4fotf features non-isolated sip pol dc/dc power module 8.3-14vdc input voltage range programmable output voltage from 0.75-5.5vdc 10 amp (t/10) or 16 amp (t/16) output current models drives 1000 f capacitive loads high power conversion ef? ciency 94.5% at 3.3 vout outstanding thermal derating performance over temperature and over current protection on/off control, sense and optional sequence/ track input ul/en/iec 60950-1 safety industry-standard (dosa) sip format rohs 6 hazardous substance compliance contents page description, connection diagram, photograph 1 ordering guide, model numbering 2 detailed electrical speci? cations 3 output voltage adjustment, soldering guidelines 4 mechanical speci? cations, input/output pinout 5 application notes 6 okx2-t/10-d12 performance data 9 okx2-t/16-d12 performance data and oscillograms 11 okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 1 of 15 for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
part number structure ? 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. 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. ordering guide model number ? output input ef? ciency on/off polarity sequence/ track package c83, pinout p83 v out (volts) i out (amps max) power (watts) r/n (mvp-p) max. regulation (max.) vin nom. (volts) range (volts) ? iin, no load (ma) iin, full load (amps) case dimensions are in inches (mm) line load min. typ. okx-t/10-d12p-c 0.75-5.5 10 50 40 0.15% 0.25% 12 8.3-14 80 4.41 93% 94.5% pos. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx-t/10-d12n-c 0.75-5.5 10 50 40 0.15% 0.25% 12 8.3-14 80 4.41 93% 94.5% neg. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/10-d12p-c 0.75-5.5 10 50 40 0.15% 0.25% 12 8.3-14 80 4.41 93% 94.5% pos. yes 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/10-d12n-c 0.75-5.5 10 50 40 0.15% 0.25% 12 8.3-14 80 4.41 93% 94.5% neg yes 2.0x0.5x0.37 (50.8x12.7x9.4) okx-t/16-d12p-c 0.75-5.5 16 80 40 0.15% 0.25% 12 8.3-14 80 7.09 92.5% 94% pos. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx-t/16-d12n-c 0.75-5.5 16 80 40 0.15% 0.25% 12 8.3-14 80 7.09 92.5% 94% neg. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/16-d12p-c 0.75-5.5 16 80 40 0.15% 0.25% 12 8.3-14 80 7.09 92.5% 94% pos. yes 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/16-d12n-c 0.75-5.5 16 80 40 0.15% 0.25% 12 8.3-14 80 7.09 92.5% 94% neg. yes 2.0x0.5x0.37 (50.8x12.7x9.4) performance speci? cations and ordering guide output con guration: adjustable output, unipolar, non-isolated, low voltage, single inline package (sip) maximum rated output current in amps sequence/tracking blank = not installed, delete pin 9 2 = installed, add pin 9 trimmable output voltage range d12 models = 0.75-5.5v input voltage range d12 = 8.3-14v on/off polarity p = positive polarity n = negative polarity okx 2 -/ d12 - t 16 c - rohs hazardous substance compliance c = rohs6 ( does not claim eu rohs exemption 7bClead in solder ) p note: some model number combinations may not be available. see ordering guide above. contact murata power solutions for availability. okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 2 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance and functional speci? cations see note 1 input input voltage range see ordering guide and note 7. start-up voltage 7.75v undervoltage shutdown (see note 15) 7.50v overvoltage shutdown none re? ected (back) ripple current (note 2) 25 ma pk-pk internal input filter type capacitive recommended external fuse 15a reverse polarity protection n/a. see fuse information input current: full load conditions see ordering guide inrush transient 0.4 a 2 sec. shutdown mode (off, uv, ot) 5 ma output in short circuit 100 ma no load 80 ma low line (vin=vmin, vout=vnom) 10.2 a. (okx-t/16-d12), 6.34a (okx-t/10-d12) remote on/off control (note 5) negative logic (n model suf? x) on = ground pin to +0.3v. max. off =+2.5v min. to + vin (max) positive logic (p model suf? x) on = open pin to +vin max. off = ground pin to +0.3v. max. current 1 ma max. tracking/sequencing (okx 2 models) slew rate 2 volts per millisecond, max. tracking accuracy, rising input vout = +/-100 mv of sequence in tracking accuracy, falling input vout = +/-200 mv of sequence in general and safety ef? ciency see ordering guide switching frequency 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 designed to meet ul/cul 60950-1, csa-c22.2 no. 60950-1, iec/en 60950-1 calculated mtbf per telcordia sr-232 (4a) 6.54 mhrs (okx2-t/16-d12p) calculated mtbf per mil-hdbk-217f (4b) 5.3 mhrs (okx2-t/16-d12p) output output voltage range see ordering guide minimum loading no minimum load accuracy (50% load, untrimmed) 2 % of vnominal voltage output range (note 13) see ordering guide overvoltage protection (note 16) none temperature coef? cient 0.02% per oc of vout range ripple/noise (20 mhz bandwidth) see ordering guide and note 8 line/load regulation see ordering guide and note 10 maximum capacitive loading (note 14) cap-esr=0.001 to 0.01 ohms 1,000 f cap-esr >0.01 ohms 5,000 f current limit inception (note 6) 30 amps (okx2-t/16-d12) (98% of vout setting, after warm up) 25 amps (okx2-t/10-d12) short circuit mode short circuit current output 2 a protection method hiccup autorecovery upon overload removal. (note 7) short circuit duration continuous, no damage (output shorted to ground) prebias startup converter will start up if the external output voltage is less than vset dynamic load response 75 sec max. to within 2% of ? nal value (50-100% load step, di/dt=2.5a/sec) 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 see mechanical speci? cations weight 0.2 ounces (5.6 grams) electromagnetic interference designed to meet fcc part 15, class b, en55022 and cispr22 class b conducted and radiated (may need external ? lter) restriction of hazardous substances rohs6 ( does not claim eu rohs exemption 7bClead in solder ) absolute maximum ratings input voltage (continuous or transient) 0 v.to +15 volts max. (d12 models) on/off control 0 v. min. to +vin max. input reverse polarity protection see fuse section output current (note 7) current-limited. devices can withstand a sustained short circuit without damage. the outputs are not intended to accept appreciable reverse current. storage temperature -55 to +125 deg. c. lead temperature see soldering speci? cations 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 speci? cations table is not implied nor recommended. speci? cation 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) 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. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower airflow, the dc/dc converter will tolerate brief full current outputs if the total rms current over time does not exceed the derating curve. (4a) mean time before failure is calculated using the telcordia (belcore) sr-332 method 1, case 3, issue 2, ground fixed controlled conditions, tambient=+25 deg.c, full output load, natural air convection. (4b) mean time before failure is calculated using mil-hdbk-217f, gb ground benign, tambient=+25 deg.c, full output load, natural air convection. (5) the on/off control input should use either a switch or an open collector/open drain transistor referenced to -input common. a logic gate may also be used by applying appropriate external voltages which not exceed +vin. (6) short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 3 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
soldering guidelines murata power solutions recommends the speci? cations below when installing these converters. these speci? cations vary dependin g on the solder type. exceeding these speci? ca- tions may cause damage to the product. be cautious when there is high atmospheric humidity. we strongly recommend a mild pre-ba ke (100 c. for 30 minutes). your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. wave solder operations for through-hole mounted products (thmt) for sn/ag/cu based solders: for sn/pb based solders: maximum preheat temperature 115 c. maximum preheat temperature 105 c. maximum pot temperature 270 c. maximum pot temperature 250 c. maximum solder dwell time 7 seconds maximum solder dwell time 6 seconds speci? cation notes, cont.: (7) hiccup overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. if the overcurrent condition still exists, the restart current will be removed and then tried again. this short current pulse prevents overheating and damaging the converter. once the fault is removed, the converter immediately recovers normal operation. (8) output noise may be further reduced by adding an external filter. at zero output current, the output may contain low frequency components which exceed the ripple specification. the output may be operated indefinitely with no load. (9) all models are fully operational and meet published specifications, including cold start at C40c. (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. output voltage adjustment the output voltage may be adjusted over a limited range by connect- ing an external trim resistor (rtrim) between the trim pin and ground. the rtrim resistor must be a 1/10 watt precision metal ? lm type, 1% accuracy or better with low temperature coef? cient, 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 speci? ed limits of the output voltage or the converters maximum power rating when applying these resistors. also, avoid high noise at the trim input. however, to prevent instability, you should never connect any capaci- tors to trim. r trim ( ) = ________________ C1000 v out C 0.7525v 10500 okx2-t/10-d12, -t/16-d12 output voltage calculated rtrim (k) 5.0 v. 1.472 3.3 v. 3.122 2.5 v. 5.009 2.0 v. 7.416 1.8 v. 9.024 1.5 v. 13.05 1.2 v. 22.46 1.0 v. 41.424 0.7525 v. (open) resistor trim equation, d12 models: okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 4 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
mechanical specifications i/o connections pin function pin function 1 + output 6 common 2 + output 7 + input 3 +sense in 8 + input 4 + output 9* *vtrack seq 5 common 10 trim 11 on/off control *vtrack seq is optional. if not installed, pin 9 is omitted. 1.5 .06 4.3 .17 .20 ref 5.1 12.70 .500 10.16 .400 1.27 .050 35.56 1.400 .100 typ 2.54 1.52 51.3 2.02 48.26 1.900 10.16 .400 12.70 .500 35.56 1.400 10.16 2.54 typ .060 .060 .040 1.02 (x10 or 11*) .400 .100 .060 .175 4.45 .030 typ 0.76 .37 max 9.4 pins: tin material: pins: copper alloy finish: (all pins) 11 5 4 3 2 1 10 9* 8 7 6 2.00 50.8 .50 12.7 recommended footprint -top view 11 10 9* 8 7 6 5 4 3 2 1 nine (9) units per tube shipping tubes 0.63 ref 15.9 0.82 ref 20.8 20.975 between barrels of pins (ref) shipping label 21.88 tube length 555.8 okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 5 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 1?
input fusing certain applications and/or safety agencies may require fuses at the inputs of power conversion components. fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. we recommend a time delay fuse installed in the ungrounded input supply line with a value which is approximately twice the maximum line current, calcu- lated at the lowest input voltage. please refer to the speci? cations. 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 speci? cations). once operating, converters will not turn off until the input voltage drops below the under-voltage shutdown limit. subsequent restart will not occur until the input voltage rises again above the start-up threshold. this built-in hysteresis prevents any unstable on/off opera- tion at a single input voltage. 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 speci? cations) 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 speci? ed accuracy band. actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and ? nal 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 speci? ed accuracy band. the speci? cation assumes that the output is fully loaded at maximum rated current. similar conditions apply to the on to vout regulated speci? cation such as external load capacitance and soft start circuitry. input source impedance these converters will operate to speci? cations without external components, assuming that the source voltage has very low impedance and reasonable input voltage regulation. since real-world voltage sources have ? nite imped- ance, performance is improved by adding external ? lter components. some- times only a small ceramic capacitor is suf? cient. since it is dif? cult to totally characterize all applications, some experimentation may be needed. note that external input capacitors must accept high speed ac switching currents. application notes because of the switching nature of dc/dc converters, the input of these converters must be driven from a source with both low ac impedance and adequate dc input regulation. performance will degrade with increasing input inductance. excessive input inductance may inhibit operation. the dc input regulation speci? es that the input voltage, once operating, must never degrade below the shut-down threshold under all load conditions. be sure to use adequate trace sizes and mount components close to the converter. i/o filtering, input ripple current and output noise all models in this converter series are tested and speci? ed for input re? ected ripple current and output noise using designated external input/output compo- nents, circuits and layout as shown in the ? gures below. external input capaci- tors (cin in the ? gure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient ir drops in the input conductors. users should select input capacitors for bulk capacitance (at appropriate frequencies), low esr and high rms ripple current ratings. in the ? gure below, the cbus and lbus components simulate a typical dc voltage bus. your speci? c system con? guration may require additional considerations. please note that the values of cin, lbus and cbus may vary according to the speci? c converter model. in critical applications, output ripple and noise (also referred to as periodic and random deviations or pard) may be reduced by adding ? lter elements such as multiple external capacitors. be sure to calculate component tempera- ture rise from re? ected ac current dissipated inside capacitor esr. c in v in c bus l bus c in = 2 x 100f, esr < 700m @ 100khz c bus = 1000f, esr < 100m @ 100khz l bus = 1h +input -input current probe to oscilloscope + C + C figure 2: measuring input ripple current c1 c1 = 0.1f ceramic c2 = 10f tantalum load 2-3 inches (51-76mm) from module c2 r load copper strip copper strip scope +output +sense -output figure 3: measuring output ripple and noise (pard) okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 6 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
in the ? gure, 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 ? xture. minimum output loading requirements all models regulate within speci? cation 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. there is a small amount of temperature hysteresis to prevent rapid on/off cycling. the temperature sensor is typically located adjacent to the switching controller, approximately in the center of the unit. see the performance and functional speci? cations. caution: if you operate too close to the thermal limits, the converter may shut down suddenly without warning. be sure to thoroughly test your applica- tion to avoid unplanned thermal shutdown. 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 air? ow measured in linear feet per minute (lfm). note that these are average measurements. the converter will accept brief increases in current or reduced air? ow as long as the average is not exceeded. note that the temperatures are of the ambient air? ow, not the converter itself which is obviously running at higher temperature than the outside air. also note that very low ? ow rates (below about 25 lfm) are similar to natural convection, that is, not using fan-forced air? ow. murata power solutions makes characterization measurements in a closed cycle wind tunnel with calibrated air? ow. 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 overvoltage protection this converter monitors its output voltage for an over-voltage condition. if the output exceeds ovp limits, the sensing circuit will power down the unit, and the output voltage will decrease. after a time-out period, the pwm will automatically attempt to restart, causing the output voltage to ramp up to its rated value. it is not necessary to power down and reset the converter for the automatic ovp-recovery restart. if the fault condition persists and the output voltage climbs to excessive levels, the ovp circuitry will initiate another shutdown cycle. this on/off cycling is referred to as hiccup mode. it safely tests full current rated output voltage without damaging the converter. output fusing the converter is extensively protected against current, voltage and temperature extremes. however your output application circuit may need additional protec- tion. in the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. consider using an appropriate fuse in series with the output. output current limiting as soon as the output current increases to approximately 125% to 150% of its maximum rated value, the dc/dc converter will enter a current-limiting mode. the output voltage will decrease proportionally with increases in output current, thereby maintaining a somewhat constant power output. this is also commonly referred to as power limiting. current limiting inception is de? ned as the point at which full power falls below the rated tolerance. see the performance/functional speci? cations. note particularly that the output current may brie? y 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 (approxi- mately 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 cur- rent, thereby preventing excessive internal temperatures and/or component damage. a short circuit can be tolerated inde? nitely. remote sense input the sense input is normally connected at the load for the respective sense polarity (+sense to the +vout load). sense inputs compensate 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. sense inputs also improve 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 con- nect 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 signi? cant inductance introduced into the sense control loop can adversely affect overall system stability. if in doubt, test your applications by observing the converters output transient response during step loads. there should not be any appreciable ringing or oscillation. you may also adjust the output trim slightly to compensate for voltage loss in any external ? lter elements. do not exceed maximum power ratings. exces- sive voltage differences between vout and sense together with trim adjustment okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 7 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
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 on the input side, a remote on/off control can be ordered with either polarity. please refer to the connection diagram on page 1 for on/off connections. positive: standard models are enabled when the on/off pin is left open or is pulled high to +vin with respect to Cvin. an internal bias current causes the open pin to rise 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 speci? cations) with respect to Cvin. negative: optional negative-polarity devices are on (enabled) when the on/ off is grounded or brought to within a low voltage (see speci? cations) with respect to Cvin. the device is off (disabled) when the on/off is left open or is pulled high to +vin with respect to Cvin. 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 ? nite time in milliseconds (see speci? cations) 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 speci? cations. 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 speci? cation 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/track input (optional) after external input power is applied and the converter stabilizes, a high impedance sequence/track input pin accepts an external analog voltage referred to -vin. the output power voltage will then track this sequence/ track 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 other- wise phased as needed for the output power, all fully controlled by the users external circuits. as a direct input to the converters feedback loop, response to the sequence/track input is very fast (milliseconds). operation to use the sequence/track pin after power start-up stabilizes, apply a rising external voltage to the sequence/track input. as the voltage rises, the output voltage will track the sequence/track input (gain = 1). the output voltage will stop rising when it reaches the normal set point for the converter. the sequence/track input may optionally continue to rise without any effect on the output. keep the sequence/track input voltage below the converters input supply voltage. use a similar strategy on power down. the output voltage will stay constant until the sequence/track input falls below the set point. guidelines for sequence/track applications [1] leave the converters 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/track 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/track pin, leave it open. [4] observe the output slew rate relative to the sequence/track input. a rough guide is 2 volts per millisecond maximum slew rate. if you exceed this slew rate on the sequence/track pin, the converter will simply ramp up at its maximum output slew rate (and will not necessarily track the faster sequence/ track input). the reason to carefully consider the slew rate limitation is in case you want two different pols to precisely track each other. [5] be aware of the input characteristics of the sequence/track pin. the high input impedance affects the time constant of any small external ramp capaci- tor. 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 inde? nitely. the converter is characterized and meets all its speci? cations only at the setpoint voltage (plus or minus any trim voltage). [7] the sequence/track 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 pres- ent 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 program- mable logic or because of blocking diode leakage or small currents passed through forward biased esd diodes. this feature is variously called mono- tonic because the voltage does not decay or produce a negative transient once the input power is applied and startup begins. okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 8 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance data okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 0.7525v) 12345678910 54 59 64 69 74 79 84 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 14v okx2-t/10-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 0.75v). 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 8 8.5 9 9.5 10 10.5 11 natural convection ambient temperature (oc) output current (amps) okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1v) 12345678910 54 59 64 69 74 79 84 load current (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 14v okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.2v) 12345678910 64 69 74 79 84 89 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.5v) 12345678910 66 71 76 81 86 91 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 9 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance data okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.8v) 12345678910 70 75 80 85 90 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/10-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 1.8v). 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 8 8.5 9 9.5 10 10.5 11 natural convection 100 lfm ambient temperature (oc) output current (amps) okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 2.5v) 12345678910 75 77 79 81 83 85 87 89 91 93 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 3.3v) 12345678910 75 77 79 81 83 85 87 89 91 93 95 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/10-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 3.3v). 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 8 8.5 9 9.5 10 10 . 5 11 ambient temperature (oc) output current (amps) natural convection 100 lfm okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 10 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance data okx2-t/10-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 5v) 12345678910 76 81 86 91 96 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/10-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 5v). 8 8.5 9 9.5 10 10.5 11 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection 100 lfm ambient temperature (oc) output current (amps) okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 0.7525v) 54 59 64 69 74 79 84 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 14v okx2-t/16-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 0.75v). 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 ambient temperature (oc) 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 output current (amps) natural convection 100 lfm 200 lfm 300 lfm 400 lfm okx2-t/16-d12 output ripple and noise (vin=12v, vout=0.75v, iout=16a, cin=1000f, cload=1f // 10f, scopebw=100mhz) okx2-t/16-d12-c on/off enable startup delay (vin=12v, vout=0.75v, iout=16a, cin=1000f, cload=1f // 10f) trace 1=enable in, trace2=vout okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 11 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance data okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1v) 56 61 66 71 76 81 86 12345678910111213141516 load current (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 14v okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.2v) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 64 69 74 79 84 89 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.5v) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 66 71 76 81 86 91 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/16-d12 output ripple and noise (vin=12v, vout=1.5v, iout=16a, cin=1000f, cload=1f // 10f, scopebw=100mhz) okx2-t/16-d12 step load transient response (vin=12v, vout=1.5v, cin=1000f, cload=0, iout=8a to 16a to 8a) trace1=vout, 200 mv/div., trace4=iout, 5a/div. okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 12 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance data okx2-t/16-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 1.8v). 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 ambient temperature (oc) 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 output current (amps) natural convection 100 lfm 200 lfm 300 lfm 400 lfm okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.8v) 12345678910111213141516 70 75 80 85 90 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 2.5v) 12345678910111213141516 75 77 79 81 83 85 87 89 91 93 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 3.3v) okx2-t/16-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 3.3v). 12345678910111213141516 75 77 79 81 83 85 87 89 91 93 95 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 ambient temperature (oc) output current (amps) natural convection 100 lfm 200 lfm 300 lfm 400 lfm okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 13 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance data okx2-t/16-d12-c step load transient response (vin=12v, vout=3.3v, cin=1000f, cload=0, iout=8a to 16a to 8a) trace1=vout, 200 mv/div., trace4=iout, 5a/div. okx2-t/16-d12 output ripple and noise (vin=12v, vout=3.3v, iout=16a, cin=1000f, cload=1f // 10f, scopebw=100mhz) okx2-t/16-d12 ef? ciency vs. line voltage and load current @ +25 c (v out = 5v) okx2-t/16-d12-c maximum current temperature derating at sea level (v in = 12v, v out = 5v). 12345678910111213141516 76 81 86 91 96 v in = 8.3v v in = 12v v in = 14v load current (amps) ef?ciency (%) 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 natural convection 100 lfm 200 lfm 300 lfm 400 lfm ambient temperature (oc) output current (amps) okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 14 of 15 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
performance data okx2-t/16-d12-c on/off enable startup delay (vin=12v, vout=5v, iout=16a, cin=1000f, cload=1f // 10f) trace 1=enable in, trace2=vout okx2-t/16-d12 output ripple and noise (vin=12v, vout=5v, iout=16a, cin=1000f, cload=1f // 10f, scopebw=100mhz) okx2-t/16-d12 step load transient response (vin=12v, vout=5v, cin=1000f, cload=0, iout=8a to 16a to 8a) trace1=vout, 200 mv/div., trace4=iout, 5a/div. okx t/10 & t/16-d12 series adjustable dosa 10/16-amp sip dc/dc converters mdc_ mdc_okx2_t10t16.a03 page 15 of 15 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 her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to cha nge without notice. ? 2009 murata power solutions, inc. usa: mans? eld (ma), tel: (508) 339-3000, email: sales@murata-ps.com canada: toronto, tel: (866) 740-1232, email: toronto@murata-ps.com uk: milton keynes, tel: +44 (0)1908 615232, email: mk@murata-ps.com france: montigny le bretonneux, tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com germany: mnchen, tel: +49 (0)89-544334-0, email: munich@murata-ps.com japan: tokyo, tel: 3-3779-1031, email: sales_tokyo@murata-ps.com osaka, tel: 6-6354-2025, email: sales_osaka@murata-ps.com china: shanghai, tel: +86 215 027 3678, email: shanghai@murata-ps.com guangzhou, tel: +86 208 221 8066, email: guangzhou@murata-ps.com singapore: parkway centre, tel: +65 6348 9096, email: singapore@murata-ps.com murata power solutions, inc. 11 cabot boulevard, mans? eld, 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 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com 03/25/09

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