View OKX-T3-D12_4810593.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

the okx-t/3-d12 series are miniature sip non- isolated point-of-load (pol) dc/dc power convert- ers for embedded applications. the module is fully compatible with distributed-power open standards alliance industry-standard speci? cations. applications include powering cpus, datacom/ telecom systems, programmable logic and mixed voltage systems. the wide input range is 8.3 to 13.8 volts dc at 3 amps. 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. these converters also include under voltage lock out (uvlo), output short circuit protec- tion, over-current and over temperature 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. okx-t/3-d12 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 open = on closed = off +vin +vout trim controller reference and error ampli?er t4xjudijoh t'jmufst t$vssfou4fotf (positive on/off) features ? non-isolated sip pol dc/dc power module ? 8.3-13.8vdc input voltage range ? programmable output voltage from 0.7525- 5.5vdc ? under voltage shutdown (vin) ? drives 1000 f ceramic capacitive loads ? high power conversion ef? ciency 93% at 5 vout (typical) ? outstanding thermal derating performance ? over temperature and over current protection ? on/off control ? ul60950, csa-c22.2 no.60950 iec/en60950 (pending) ? industry-standard (dosa) sip format ? rohs-6 hazardous substance compliance typical unit typical uni t (pending) okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 1 of 15 www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $
part number structure performance specifications summary and ordering guide model number ? output input ef? ciency case dimensions are in inches (mm) v out (volts) ? i out (amps, max) ? power (watts) r/n (mvp-p) max. d regulation (max.) vin nom. (volts) range (volts) e iin, no load (ma) iin, full load (amps) line load min. typ. okx-t/3-d12-c .7525-5.5 3 15 20 0.15% 0.3% 12 8.3-13.8 40 1.344 91.5% 93.0% 0.40x0.90x0.282 (10.16x 22.86x 7.163) maximum rated output current in amps trimmable output voltage range d12 models = 0.7525-5.5v input voltage range d12 = 8.3-13.8v on/off logic p = positive logic n = negative logic -/ d12 - t 3 okami non-isolated pol sip mount x ok c - rohs hazardous substance compliance c = rohs-6 ( does not claim eu rohs exemption 7bClead in solder ) n note: some model number combinations may not be available. see ordering guide above. contact murata power solutions for availability. ? all specifications are at nominal line voltage, vout=nominal (5v for d12 models) and full load, +25c unless otherwise noted. d ripple and noise (r/n) is shown at vout=1v. see specs for details. e the input voltage range must be 0.5v greater than the output voltage. okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 2 of 15 www.murata-ps.com/support
functional specifications, okx-t/3-d12-c 15 absolute maximum ratings conditions ? minimum typical/nominal maximum units input voltage, continuous full power operation 0 15 vdc input reverse polarity none, install external fuse none vdc on/off remote control power on or off, referred to -vin 0 13.8 vdc output power 0 15 15.3 w output current current-limited, no damage, short-circuit protected 03a 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-ter m reliability. proper operation under conditions other than those listed in the performance/functional speci? cations table is not implied or recommended. input conditions ? ? operating voltage range vin vout +2 8.3 12 13.8 vdc recommended external fuse fast blow 4 a turn on/start-up threshold rising input voltage 7.5 8.0 8.3 vdc turn off/undervoltage lockout falling input voltage 7.3 7.8 8.05 vdc reverse polarity protection none, install external fuse none vdc internal filter type c-type input current full load conditions vin = nominal (5vo set) 1.344 1.393 a low line vin @ min, 5 vout 1.934 2.005 a inrush transient 0.4 a2-sec. short circuit input current 60 ma no load input current 5vout, iout @ 0 40 70 ma no load input current 0.75v, iout @ 0 20 35 shut-down mode input current 5ma re? ected (back) ripple current ? measured at input with speci? ed ? lter 60 ma, pk-pk general and safety ef? ciency @ vin nom, 5vout 91.5 93 % @ vin min, 5vout 93.5 95 % @ vin nom, 3.3vout 89.5 91 % @ vin nom, 2.5vout 88 89.5 % @vin nom, 1.8vout 85 87 % @vin nom, 1.5vout 83 85 % @vin nom, 1.2vout 80.5 82.5 % @vin nom, 1vout 78 80 % safety certi? ed to ul-60950-1, csa-c22.2 no.60950-1, iec/en60950-1, 2nd edition (pending) yes calculated mtbf ? per telcordia sr332, issue 1 class 3, ground ? xed, tambient=+25?c tbd hours x 10 6 dynamic characteristics fixed switching frequency 290 320 350 khz startup time power on, to vout regulation band, 100% resistive load 810ms startup time remote on to 10% vout (50% resistive load) 6 ms dynamic load response 50-100-50% load step, settling time to within 2% of vout di/dt = 2.5 a/sec 80 sec dynamic load peak deviation same as above 150 mv features and options remote on/off control ? n suf? x: negative logic, on state pin open=on 0 0.4 v negative logic, off state 1.5 +vin v control current open collector/drain 1 ma p suf? x: positive logic, on state pin open=on 7.8 +vin v positive logic, off state 0 0.4 v control current open collector/drain 1 ma okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 3 of 15 www.murata-ps.com/support
output conditions ? minimum typical/nominal maximum units total output power 0 15 15.3 w voltage nominal output voltage range see trim formula 0.7525 5.5 vdc setting accuracy at 50% load -2 2 % of vnom. output voltage overshoot - startup: 1 %vo nom current output current range 033a minimum load no minimum load current limit inception ? 98% of vnom., after warmup @2.5vout 3.5 7.5 9 a short circuit short circuit current ? hiccup technique, autorecovery within 1% of vout 2a short circuit duration (remove short for recovery) output shorted to ground, no damage continuous short circuit protection method current limiting regulation ? total regulation band over all line, load and temp conditions 2 % vo set line regulation vin=min. to max. vout=nom. 0.15 % load regulation iout=min. to max. vin=48v. 0.3 % ripple and noise ? 5vo, 12vin 100 mv pk-pk ripple and noise 3.3vo, 12vin 75 mv pk-pk ripple and noise 1.8vo, 12vin 35 mv pk-pk ripple and noise 1vo, 12vin 20 mv pk-pk temperature coef? cient at all outputs 0.02 % of vnom./c maximum capacitive loading 14 low esr; >0.001, <0.01 ohm 1000 uf maximum capacitive loading 0.01 ohm 3000 f mechanical (through hole models) outline dimensions 0.40x0.90x0.282 inches 10.2x22.9x8.85 mm weight 0.1 ounces 2.8 grams environmental operating ambient temperature range ? full power, all output voltages, see derating curves -40 85 c operating pcb temperature 12 no derating -40 100 c storage temperature vin = zero (no power) -55 125 c thermal protection/shutdown measured in center 130 130 135 c electromagnetic interference conducted, en55022/cispr22 external ? lter is required b class radiated, en55022/cispr22 b class functional specifications, okx-t/3-d12-c (cont.) 13 notes ? specifications are typical at +25 deg.c, vin=nominal (+12v.), vout=nominal (+5v), 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 recom- mends installation of these capacitors. all models are stable and regulate within spec under no-load conditions. ? input back ripple current is tested and specified over a 5 hz to 20 mhz bandwidth. input filtering is cin=2 x 100 f tantalum, cbus=1000 f electrolytic, lbus=1 h. ? note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower airflow, the dc/dc converter will tolerate brief full current outputs if the total rms current over time does not exceed the derating curve. ? 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. ? the on/off control input should use either a switch or an open collector/open drain transistor referenced to -input common. a logic gate may also be used by applying appropriate external voltages which not exceed +vin. ? short circuit shutdown begins when the output voltage degrades approximately 1% from the selected setting. ? hiccup overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. if the overcurrent condition still exists, the restart current will be removed and then tried again. this short current pulse prevents overheating and damaging the converter. once the fault is removed, the converter immediately recovers normal operation. ? output noise may be further reduced by adding an external filter. at zero output current, the output may contain low frequency components which exceed the ripple specification. the output may be operated indefinitely with no load. ? all models are fully operational and meet published specifications, including cold start at C40c. ? regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. other input or output voltage ranges will be reviewed under scheduled quantity special order. maximum pc board temperature is measured with the sensor in the center of the converter. do not exceed maximum power specifications when adjusting the output trim. 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. 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. the outputs are not intended to sink appreciable reverse current. 14 15 16 13 12 11 okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 4 of 15 www.murata-ps.com/support
performance data, okx-t/3-d12-c ef? ciency vs. line voltage and load current @ +25c (v out = 5v) ef? ciency vs. line voltage and load current @ +25c (v out = 2.5v) ef? ciency vs. line voltage and load current @ +25c (v out = 1.5v) ef? ciency vs. line voltage and load current @ +25c (v out = 1.2v) ef? ciency vs. line voltage and load current @ +25c (v out = 3.3v) ef? ciency vs. line voltage and load current @ +25c (v out = 1.8v) 70 72 74 76 78 80 82 84 86 88 90 92 94 96 0 0.5 1 1.5 2 2.5 3 3.5 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 13.8v 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 0 0.5 1 1.5 2 2.5 3 3.5 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 13.8v 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 0 0.5 1 1.5 2 2.5 3 3.5 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 13.8v 0 0.5 1 1.5 2 2.5 3 3.5 68 70 72 74 76 78 80 82 84 86 88 90 92 94 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 13.8v 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 0 0.5 1 1.5 2 2.5 3 3.5 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 13.8v 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 0 0.5 1 1.5 2 2.5 3 3.5 load curre nt ( am p s ) ef?ciency (%) v in = 8.3v v in = 12v v in = 13.8v okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 5 of 15 www.murata-ps.com/support
performance data, okx-t/3-d12-c ef? ciency vs. line voltage and load current @ +25c (v out = 1v) maximum current temperature derating at sea level (for vin = 12.0v, vout = 0.75 to 5v. air? ow is from pin 3 to pin 2.) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 0 0.5 1 1.5 2 2.5 3 3.5 load curre nt (amps) ef?ciency (%) v in = 8.3v v in = 12v v in = 13.8v okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 6 of 15 www.murata-ps.com/support
performance data, okx-t/3-d12-c step load transient response (vin=12v, vout=5v, cload=1uf || 10uf) top trace=vout, bottom trace=iout 1.5a 3.0a (di/dt=2.5a/usec) 3.0a 1.5a (di/dt=2.5a/usec) 12vin step load transient response (vin=12v, vout=0.75v, cload=1uf || 10uf) top trace=vout, bottom trace=iout 1.5a 3.0a (di/dt=2.5a/usec) 3.0a 1.5a (di/dt=2.5a/usec) 12vin okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 7 of 15 www.murata-ps.com/support
performance data, okx-t/3-d12-c start-up delay (vin=12v, cin=100uf, cload= 1uf || 10uf, ta=+25c) vout=5v vout=0.75v 0a 0a okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 8 of 15 www.murata-ps.com/support
performance data, okx-t/3-d12-c output ripple and noise (vin=12v, cout= 1 uf || 10 uf, ta=+25c) 0a 3.0a 5.0vout 3.3vout okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 9 of 15 www.murata-ps.com/support
performance data, okx-t/3-d12-c output ripple and noise (vin=12v, cout= 1 uf || 10 uf, ta=+25c) 0a 3.0a 1.8vout 1.0vout okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 10 of 15 www.murata-ps.com/support
mechanical specifications [ 2.54 ] 0.1 0 0 [ 5.08 ] 0.2 0 0 [ 17.78 ] 0 .7 0 0 [ 20.32 ] 0 . 80 0 (5 o r 6 p l s ) [ 0.94 ] 0.0 3 7 [ 7.62 ] 0 . 3 0 [ 23.37 ] 0 . 9 2 [ 1.52 ] 0 . 0 6 [ 1.5 2] 0 . 0 6 0. 0 5 1 . 3 0. 2 3 5 . 8 5 4 3 2 1 re co mmended f oo tprin t ( vie w ed f r om to p ) i so m e t r i c vi ew (ref o n ly ) to p v i e w 0 . 2 8 7 . 1 4 3 2 4 3 2 5 fr o n t vie w 0 0 .4 0 1 10 . 2 0 . 3 4 r e f 22 . 9 0 . 9 0 1 . 3 0 . 0 5 2 0 . 3 2 0 . 80 0 ty p 0 0 . 02 5 0 .1 0 0 ty p 2. 5 4 e n d vi ew 0 . 05 7 re f 1 . 4 5 0 . 5 5 r e f 3. 8 0 .1 5 0 . 6 4 0 . 02 5 i/o connections pin function 1 +vout 2 trim 3 gnd (common) 4 +vin 5 remote on/off *the remote on/off can be provided with either positive (p) or negative (n) logic. okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 11 of 15 www.murata-ps.com/support third angle projection dimensions are in mm [inches] 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?
standard packaging 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? carton accommodates four (4) trays of 75 yielding 300 converters per carton. each static dissipative polyethylene foam tray accommodates 75 converters 10.50.25 (266.7) 11.00 .25 (279.4) 2.75.25 (69.85) closed height okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 12 of 15 www.murata-ps.com/support
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 technical 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. 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. 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/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 13 of 15 www.murata-ps.com/support
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 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 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 par- ticularly 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 on/off control the remote on/off control can be ordered with either logic type. please refer to the connection diagram on page 1 for on/off connections. positive logic 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-logic devices are disabled when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to Cvin. negative logic 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. 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. 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. c1 c1 = 1f c2 = 10f load 2-3 inches (51-76mm) from module c2 r load scope +output +sense -output figure 3. measuring output ripple and noise (pard) okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 14 of 15 www.murata-ps.com/support
soldering guidelines murata power solutions recommends the speci? cations below when install- ing 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 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: 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/3-d12n-c x00103 okx-t/3-d12p-c x01103 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 is recommended to have a 0.5% 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 below, 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 capacitors to trim. okx-t/3-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: r trim ( : ) = _____________ C1000 v out C 0.7525v 10500 okx-t/3-d12 series adjustable 3-amp sip non-isolated dc/dc converters mdc_okx-t/3-d12 series.a01 page 15 of 15 www.murata-ps.com/support 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. ? 2012 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans? eld, 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/ 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 4. label artwork layout x00016 product code mfg. date code revision level ymdx rev.

▲Up To Search▲

Price & Availability of OKX-T3-D12

	To Download OKX-T3-D12 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .