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the okx-t/10 and -t/16 series are miniature sip non-isolated point-of-load (pol) dc/dc power converters for embedded applications. the module is fully compatible with distributed-power open standards alliance (dosa) industry-standard speci? cations (www.dosapower.com). applications include powering cpus, datacom/telecom systems, programmable logic and mixed voltage systems. the wide input range is 2.4 to 5.5 volts dc. two maximum output currents are offered, 10 amps (t/10 models) or 16 amps (t/16 models). based on ? xed-frequency synchronous buck converter switching topology, the high power conversion ef? cient point of load (pol) module features pro- grammable output voltage and on/off control. an optional sequence/tracking input allows controlled ramp-up and ramp-down outputs. the sense input provides load compensation. these converters also include under voltage lock out (uvlo), output short circuit protection, over-current and over tempera- ture protections. these units are designed to meet all standard ul/en/iec 60950-1 safety certi? cations and rohs- 6 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/tracking (optional) open = on closed = off +vin +vout trim sense controller reference and error ampli?er t4xjudijoh t'jmufst t$vssfou4fotf (positive on/off) features non-isolated sip pol dc/dc power module 2.4-5.5vdc input voltage range programmable output voltage from 0.7525-3.63vdc 10 amp (t/10) or 16 amp (t/16) output current models drives 1000 f ceramic capacitive loads high power conversion ef? ciency 95% at 3.3 vout outstanding thermal derating performance over temperature and over current protection on/off control, sense and optional sequence/ tracking input ul/en/iec 60950-1 safety industry-standard (dosa) sip format rohs-6 hazardous substance compliance contents page description, connection diagram, photograph 1 ordering guide, model numbering 2 mechanical speci? cations, input/output pinout 3 detailed electrical speci? cations 5 output voltage adjustment, soldering guidelines, product label 6 application notes 7 okx-t/10-w5 performance data 10 okx-t/16-w5 oscillograms and performance data 11 typical unit okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 1 of 13 www.murata-ps.com for full details go to www.murata-ps.com/rohs $ www.murata-ps.com/support
part number structure ? the input voltage range must be 0.5v greater than the output voltage. all specifications are at nominal line voltage, vout=nominal (3.3v for w5 models) and full load, +25 deg.c. unless otherwise noted. output capacitors are 1 f ceramic and 10 f electrolytic in parallel. input cap is 22 f. see detailed specifications. i/o caps are necessary for our test equipment and may not be needed for your application. use adequate ground plane and copper thickness adjacent to the converter. ripple and noise (r/n) is shown at vout=1v. see specs for details. ordering guide model number ? output input ef? ciency on/off polarity sequence/ tracking package c86, pinout p84 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-w5p-c 0.7525-3.63 10 33 25 0.2% 0.5% 5 2.4-5.5 80 6.91 94.0% 95.5% pos. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx-t/10-w5n-c 0.7525-3.63 10 5 2.4-5.5 neg. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/10-w5p-c 0.7525-3.63 10 5 2.4-5.5 pos. yes 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/10-w5n-c 0.7525-3.63 10 5 2.4-5.5 neg yes 2.0x0.5x0.37 (50.8x12.7x9.4) okx-t/16-w5p-c 0.7525-3.63 16 52.8 30 0.3% 5 2.4-5.5 11.12 93.0% 95.0% pos. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx-t/16-w5n-c 0.7525-3.63 16 5 2.4-5.5 neg. no 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/16-w5p-c 0.7525-3.63 16 5 2.4-5.5 pos. yes 2.0x0.5x0.37 (50.8x12.7x9.4) okx2-t/16-w5n-c 0.7525-3.63 16 5 2.4-5.5 neg. yes 2.0x0.5x0.37 (50.8x12.7x9.4) performance speci? cations and ordering guide okami non-isolated pol maximum rated output current in amps sequence/tracking blank = not installed, delete pin 9 2 = installed, add pin 9 sip mount trimmable output voltage range w5 models = 0.7525-3.63v input voltage range w5 = 2.4-5.5v on/off polarity p = positive polarity n = negative polarity reversed pin mounting (see pg. 4) j = reversed pins (special order) blank = standard pins x ok 2 -/ w5 - t 16 c - rohs hazardous substance compliance c = rohs-6 ( does not claim eu rohs exemption 7bClead in solder ) p j note: some model number combinations may not be available. see ordering guide above. contact murata power solutions for availability. okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 2 of 13 www.murata-ps.com/support
mechanical specifications, standard models i/o connections pin function pin function 1 + output 6 common 2 + output 7 + input 3 +sense in 8 + input 4 + output 9* *sequence/tracking 5 common 10 trim 11 on/off control *sequence/tracking 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 ten (10) 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-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 3 of 13 www.murata-ps.com/support 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?
mechanical specifications, continued: j package option (reversed headers) i/o connections pin function pin function 1 + output 6 common 2 + output 7 + input 3 +sense in 8 + input 4 + output 9* *sequence/tracking 5 common 10 trim 11 on/off control *sequence/tracking is standard for okx2. on okx models, pin 9 is omitted. 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? .31 7.9 2.02 51.3 .040 1.02 (x10 or 11*) 1.52 .060 35.56 1.400 10.16 .400 12.70 .500 48.26 1.900 2.54 typ .100 .34 8.6 12.70 .500 10.16 .400 1.27 .050 35.56 1.400 .100 typ 2.54 .31 7.9 9.7 max .38 .050 1.27 recommended footprint -top view 11 10 9* 8 7 6 5 4 3 2 1 material: pins: copper alloy finish: (all pins) pins: tin 11 10 9* 8 7 6 5 4 3 2 1 2.00 50.8 .50 12.7 .030 typ 0.76 .13 3.3 okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 4 of 13 www.murata-ps.com/support
performance and functional speci? cations see note 1 input input voltage range see ordering guide and note 7. start-up voltage 2.05v undervoltage shutdown (see note 15) 1.90v overvoltage shutdown none re? ected (back) ripple current (note 2) 20 ma pk-pk internal input filter type capacitive recommended external fuse 15a fast blow 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 60 ma no load 80 ma low line (vin=vmin, vout=vnom) 9.05a (t/10), 14.63a (t/16) remote on/off control (note 5) negative logic (n model suf? x) on = open pin or ground to +0.4v. max. off =+1.5v min. to + vin (max) positive logic (p model suf? x) on = open pin (internally pulled up) or +1.5v to +vin max. off = ground pin to +0.4v. max. current 1 ma max. tracking/sequencing (okx 2 models) slew rate 2 volts per millisecond, max. tracking accuracy, rising input vout = 200 mv max. of sequence in tracking accuracy, falling input vout = 400 mv max. of sequence in general and safety ef? ciency see ordering guide switching frequency 300 khz start-up time (vin on to vout regulated) 8 msec for vout=nominal (on/off to vout regulated) 6 msec for vout=nominal isolation not isolated safety certi? ed to ul/cul 60950-1, csa-c22.2 no. 60950-1, iec/en 60950-1 calculated mtbf per telcordia sr-232 (4a) tbc calculated mtbf per mil-hdbk-217f (4b) tbc output 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 c 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 (min. cap. load 0 f ) current limit inception (note 6) 34 amps (okx2-t/16-w5) (98% of vout setting, after warm up) 29 amps (okx2-t/10-w5) short circuit mode short circuit current output 1 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 100 sec max. to within 2% of ? nal value (50-100% load step, di/dt=2.5a/sec) with 2 x 150 f polymer external caps. environmental operating temperature range (ambient) see derating curves -40 to +85 deg. c. with derating (note 9) operating pc board temperature -40 to +100 deg. celsius max., no derating (12) storage temperature range -55 to +125 deg. c. thermal protection/shutdown +130 deg. celsius relative humidity to 85%rh/+85 deg. c., non-condensing physical outline dimensions see mechanical speci? cations weight 0.2 ounces (5.6 grams) restriction of hazardous substances rohs-6 ( does not claim eu rohs exemption 7bClead in solder ) absolute maximum ratings input voltage (continuous or transient) 0 v.to +5.8 volts max. 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 (+5v.), vout=nominal (+3.3v), full load, external caps and natural convection unless otherwise indicated. extended tests at higher power must supply substantial forced airflow. all models are tested and specified with external 1 f paralleled with 10 f ceramic output capacitors and a 22 f external input capacitor. all capacitors are low esr types. these capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. however, murata power solutions recommends installation of these capacitors. all models are stable and regulate within spec under no-load conditions. (2) 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. (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. okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 5 of 13 www.murata-ps.com/support
soldering guidelines murata power solutions recommends the speci? cations below when installing these converters. these speci? cations vary depending on the solder type. exceeding these speci? cations may cause damage to the product. your production environment may dif- fer; therefore please thoroughly review these guidelines with your process engineers. wave solder operations for through-hole mounted products (thmt) for sn/ag/cu based solders: maximum preheat temperature 115 c. maximum pot temperature 270 c. maximum solder dwell time 7 seconds for sn/pb based solders: maximum preheat temperature 105 c. maximum pot temperature 250 c. maximum solder dwell time 6 seconds model number product code okx-t/16-w5n-c x00016 okx-t/16-w5p-c x01016 okx2-t/16-w5n-c x20016 okx2-t/16-w5p-c x21016 okx-t/10-w5n-c x00010 okx-t/10-w5p-c x01010 okx2-t/10-w5n-c x20010 okx2-t/10-w5p-c x21010 (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 ( ) = ____________ C5110 v out C 0.7525v 21070 okx2-t/10-w5, -t/16-w5 output voltage calculated rtrim (k) 3.3 v. 3.160 2.5 v. 6.947 2.0 v. 11.780 1.8 v. 15.004 1.5 v. 23.077 1.2 v. 41.973 1.0 v. 80.021 0.7525 v. (open) resistor trim equation, w5 models: okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 6 of 13 www.murata-ps.com/support product label because of the small size of these products, the product label contains a character-reduced code to indicate the model number and manufacturing date code. not all items on the label are always used. please note that the label differs from the product photograph on page 1. here is the layout of the label: the label contains three rows of information: first row C murata power solutions logo second row C model number product code (see table) third row C manufacturing date code and revision level the manufacturing date code is four characters: first character C last digit of manufacturing year, example 200 9 second character C month code (1 through 9 and o through d) third character C day code (1 through 9 = 1 to 9, 10 = o and 11 through 31 = a through z) fourth character C manufacturing information figure 2. label artwork layout x00016 product code mfg. date code revision level ymdx rev.
input fusing certain applications and/or safety agencies may require fuses at the inputs of power conversion components. fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. for greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. the installer must observe all relevant safety standards and regulations. for safety agency approvals, install the converter in compliance with the end-user safety standard, i.e. iec/en/ul 60950-1. input under-voltage shutdown and start-up threshold under normal start-up conditions, converters will not begin to regulate properly until the ramping-up input voltage exceeds and remains at the start-up threshold voltage (see 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 regulation 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. 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 converters input terminals. the capacitor should be a ceramic type such as the murata grm32 series or a polymer type. initial application notes suggested capacitor values are 10 to 22 f, rated at twice the expected maxi- mum 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 capaci- tance 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 capaci- tance listed in the speci? cations. 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 com- ponents, circuits and layout as shown in the ? gures 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 speci? c converter model. in ? gure 3, the two copper strips simulate real-world printed circuit imped- ances 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 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 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 okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 7 of 13 www.murata-ps.com/support
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 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 current 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). 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 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. 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 Cvin. 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 polarity devices are on (enabled) when the on/off pin is left open or brought to within a low voltage (see speci? cations) with respect to Cvin. the device is off (disabled) when the on/off is pulled high (see speci? cations) with respect to Cvin. 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-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 8 of 13 www.murata-ps.com/support
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/tracking input (optional) after external input power is applied and the converter stabilizes, a high impedance sequence/tracking input pin accepts an external analog volt- age 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 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/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 converters 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 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/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 its 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 pols 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 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/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 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. sequence/tracking operation is not available during pre-bias startup. okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 9 of 13 www.murata-ps.com/support
performance data C okx-t/10-w5 okx-t/10-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 3.3v) okx-t/10-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.8v) okx-t/10-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.2v) okx-t/10-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 2.5v) okx-t/10-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.5v) okx-t/10-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 0.75v) 70 75 80 85 90 95 100 012345678910 load curre nt (amps) ef?ciency (%) v in = 3.8v v in = 5v v in = 5.5v 70 75 80 85 90 95 100 0246810 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v 0246810 0 10 20 30 40 50 60 70 80 90 100 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v 70 75 80 85 90 95 100 0246810 load curre nt (amps) ef?ciency (%) v in = 3v v in = 5v v in = 5.5v 70 75 80 85 90 95 100 0246810 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v 0246810 0 10 20 30 40 50 60 70 80 90 100 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 10 of 13 www.murata-ps.com/support
performance data C okx-t/10-w5 performance data C okx-t/16-w5 okx2-t/10-w5 maximum current temperature derating at sea level (for v in = 5.0v, v out = 0.75 to 3.3v. for v in = 3.3v, v out = 0.75 to 2.5v. longitudinal air? ow.). 0 2 4 6 8 10 12 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) in this graphic data, 10 amp models perform identically to 16 amp models with the limitation of 10 amps output. okx2-t/16-w5 on/off enable startup delay (vin=5v, vout=1.5v, iout=16a, cload=0) trace 2=enable in, trace 1=vout okx2-t/16-w5 step load transient response (vin=5v, vout=1.5v, cload=0, iout=8a to 16a) trace 1=vout, 100 mv/div. trace 4=iout, 5a/div. okx2-t/16-w5 step load transient response (vin=5v, vout=1.5v, cload=0, iout=16a to 8a) trace 1=vout, 100 mv/div. trace 4=iout, 5a/div. okx2-t/16-w5 output ripple and noise (vin=5v, vout=1.5v, iout=16a, cload=0, scopebw=100mhz) okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 11 of 13 www.murata-ps.com/support
performance data C okx-t/16-w5 okx-t/16-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 3.3v) okx-t/16-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.8v) okx-t/16-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.2v) okx-t/16-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 2.5v) okx-t/16-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 1.5v) okx-t/16-w5 ef? ciency vs. line voltage and load current @ +25 c (v out = 0.75v) 70 75 80 85 90 95 100 0246810121416 load curre nt (amps) ef?ciency (%) v in = 3.8v v in = 5v v in = 5.5v 70 75 80 85 90 95 100 0 2 4 6 8 10 12 14 16 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v 70 75 80 85 90 95 100 0 2 4 6 8 10121416 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v 70 75 80 85 90 95 100 0246810121416 load curre nt (amps) ef?ciency (%) v in = 3v v in = 5v v in = 5.5v 70 75 80 85 90 95 100 0 2 4 6 8 10121416 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v 60 65 70 75 80 85 90 95 100 0246810121416 load curre nt (amps) ef?ciency (%) v in = 2.4v v in = 5v v in = 5.5v okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 12 of 13 www.murata-ps.com/support
performance data C okx-t/16-w5 okx2-t/16-w5 maximum current temperature derating at sea level (for v in = 5.0v, v out = 0.75 to 3.3v. for v in = 3.3v, v out = 0.75 to 2.5v. longitudinal air? ow.). 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) okx t/10 & t/16-w5 series adjustable dosa 10/16-amp sip dc/dc converters mdc_okx_t10t16-w5 series.a03 page 13 of 13 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. ? 2011 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered www.murata-ps.com/support
mouser electronics related product links 580-okx2-t/10-w5n-c - murata okx2-t/10-w5n-c 580-okx2-t/16-w5n-c - murata okx2-t/16-w5n-c 580-okx-t/10-w5n-c - murata okx-t/10-w5n-c 580-okx-t/16-w5n-c - murata okx-t/16-w5n-c

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