View OKR-T15-W12-C_5426343.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

features ? ? 600 khz operation ? ? 4.5-14 vdc input voltage range ? ? programmable output voltage from 0.591-6.0 vdc ? ? high power conversion ef? ciency at 93% ? ? outstanding thermal derating performance ? ? over temperature and over current protection ? ? on/off control ? ? sip, 0.41 x 0.40 x 0.24 inches (10.4 x 10.16 x 6.1 mm) ? ? certi? ed to ul/en/iec 60950-1 safety standards, 2nd edition ? ? rohs-6 hazardous substance compliance the okr-t/1.5-w12-c is a miniature sip non-isolated point-of-load (pol) dc/dc power converter measuring only 0.41 x 0.40 x 0.24 inches (10.4 x 10.16 x 6.1 mm). the wide input range is 4.5 to 14 volts dc. based on 600 khz synchronous buck topology, the high power conversion ef? cient point of load (pol) module features programmable output voltage and on/off control, under voltage lock out (uvlo), overcur- rent and over temperature protections. these units are certi? ed to ul/en/ iec 60950-1 safety standards (2nd edition) and rohs-6 hazardous substance compliance. product overview figure 1. connection diagram typical unit external dc power source f1 on/off control common common +vin +vout trim controller reference and error ampli?er t4xjudijoh t'jmufst t$vssfou4fotf rp q1 okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 1 of 16 www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $
part number structure ? the input voltage range must be +2v greater for the 3.3v and 5v outputs. ? all speci? cations are at nominal line voltage, vout=nominal (5v for w12 models) and full load, +25c unless otherwise noted. ? ripple and noise (r/n) is shown at vout=1v. see specs for details. performance specifications summary and ordering guide root model output input ef? ciency dimensions (inches) v out (volts) i out (amps max) power (watts) r/n (mvp-p) regulation (max.) v in nom. (volts) range (volts) i in , no load (ma) i in , full load (amps) max. line load min. typ. okr-t/1.5-w12-c 0.591-6 1.5 7.5 25 0.3% 0.5% 12 4.5-14 80 0.672 91% 93% 0.41x0.40x0.24 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 dif- fers 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 = jan-sep; o, n, d = oct, nov, dec) third character C day code (1 through 9 = 1 to 9, 10 = 0 and 11 through 31 = a through z) fourth character C manufacturing information figure 2. label artwork layout xxxxxx product code mfg. date code revision level ymdx rev. model number product code okr-t/1.5-w12-c 54733 output voltage range t = trimmable, 0.591-6 volts wide input voltage range w12 = 4.5 C 14 volts w12 okami non-isolated pol maximum rated output current in amps sip-mount ok r -/ - t 1.5 c - rohs hazardous substance compliance c = rohs-6 (does not claim eu rohs exemption 7bClead in solder) note: some model number combinations may not be available. contact murata power solutions for availability. okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 2 of 16 www.murata-ps.com/support
functional specifications 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 14 vdc output power 0 7.5 7.65 w output current current-limited, no damage, short-circuit protected 0 1.5 a 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 operating voltage range vinvout+2v for 3.3v and 5v 4.5 12 14 vdc recommended external fuse fast blow 3 a turn on/start-up threshold rising input voltage 3.9 4.2 4.4 vdc turn off/undervoltage lockout falling input voltage 3 3.4 3.7 vdc reverse polarity protection none, install external fuse none vdc internal filter type c-type input current full load conditions vin = nominal (5vo set) 0.672 0.701 a low line vin @ min, 5 vout 1.122 1.163 a inrush transient 0.4 a 2 -sec. short circuit input current 60 ma no load input current 5vout, iout @ 0 80 100 ma no load input current 0.59v, iout @ 0 40 55 shut-down mode input current 5ma re? ected (back) ripple current ? measured at input with speci? ed ? lter 20 ma, pk-pk general and safety ef? ciency @ vin nom, 5vout 91 93 % @ vin min, 5vout 94 95.5 % @ vin nom, 3.3vout 88.5 90 % @ vin nom, 2.5vout 86 88 % @vin nom, 1.8vout 82.5 84.5 % @vin nom, 1.5vout 80 82.5 % @vin nom, 1.2vout 77 79 % @vin nom, 1vout 74 76 % safety certi? ed to ul-60950-1, iec/en60950-1, 2nd edition yes calculated mtbf ? per telcordia sr332, issue 1, class 3, ground ? xed, tambient=+25c 10.7 hours x 10 6 dynamic characteristics fixed switching frequency 600 khz startup time power on to vout regulated (100% resistive load) 6ms startup time remote on to 10% vout (50% resistive load) 6 8 ms dynamic load response 50-100-50% load step, settling time to within 2% of vout di/dt = 2.5 a/sec 50 100 sec dynamic load peak deviation same as above 100 200 mv features and options remote on/off control ? p suf? x: a 49.2k pulldown to ground needed. positive logic, on state pin open=on 2 +vin v positive logic, off state 0 0.2 v control current open collector/drain 1 ma 15 okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 3 of 16 www.murata-ps.com/support
output conditions ? minimum typical/nominal maximum units total output power 0 7.5 7.65 w voltage nominal output voltage range see trim formula 0.591 6 vdc setting accuracy at 50% load -2 2 % of vnom. output voltage overshoot - startup: 1 %vo nom current output current range 0 1.5 1.5 a minimum load no minimum load current limit inception ? 98% of vnom., after warmup @5vout 2.65 4.15 5.15 a short circuit short circuit current ? hiccup technique, autorecovery within 1% of vout 0.6 a 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 -3 vo set 3 % vo set line regulation vin=min. to max. vout=nom. 0.3 % load regulation iout=min. to max. vin=48v. 0.5 % ripple and noise ? 5vo, 12vin 75 mv pk-pk 3.3vo, 12vin 60 mv pk-pk 1.8vo, 12vin 40 mv pk-pk 1vo, 12vin 25 mv pk-pk temperature coef? cient at all outputs 0.02 % of vnom./c maximum capacitive loading low esr; >0.001, <0.01 ohm 200 f maximum capacitive loading 0.01 ohm 1000 f mechanical outline dimensions 0.41x0.40x0.24 inches 10.4x10.2x6.1 mm weight 0.07 ounces 2 grams pin material copper alloy pin finish pure matte tin 200-280 " nickel 40-80 '' environmental operating ambient temperature range ? full power, all output voltages, see derating curves -40 85 c operating pcb temperature 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 external ? lter required b conducted, en55022/cispr22 class radiated, en55022/cispr22 b class functional specifications (cont.) 13 12 notes: ? speci? cations 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 air? ow. all models are tested and speci? ed 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 speci? ed performance in your applica- tions. however, murata power solutions recommends installation of these capacitors. all models are stable and regulate within spec under no-load conditions. ? input back ripple current is tested and speci? ed over a 5 hz to 20 mhz bandwidth. input ? ltering 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 air? ow, 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 ? xed 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 ? lter. at zero output current, the output may contain low frequency components which exceed the ripple speci? cation. the output may be operated inde? nitely with no load. ? all models are fully operational and meet published speci? cations, including cold start at C40c. ? regulation speci? cations 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 speci? cations 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. 11 12 13 14 15 16 14 okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 4 of 16 www.murata-ps.com/support
okr-t/1.5-w12-c performance data okr-t/1.5-w12-c oscillograms ef? ciency vs. line voltage and load current @ 25 c (vin = 1v) ef? ciency vs. line voltage and load current @ 25 c (vin = 3.3v) ef? ciency vs. line voltage and load current @ 25 c (vin = 2.5v) ef? ciency vs. line voltage and load current @ 25 c (vin = 5v) maximum current temperature derating @ sea level (v in = 7v and 12v, v out = 5v and 6 v) 0 10 20 30 40 50 60 70 80 90 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 v in = 14v v in = 12v v in = 4.5v load current (amps) ef?ciency (%) 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 v in = 14v v in = 12v v in = 5.5v load current (amps) ef?ciency (%) 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 v in = 14v v in = 12v v in = 4.5v load current ( amps ) ef?ciency (%) 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 v in = 14v v in = 12v v in = 7v load current (amps) ef?ciency (%) 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 natural convection ambient temperature (oc) output current (amps) there is no derating for vout = 0.591v. to 5.5v. at full load. on/off enable startup (vin=12v, vout=1.5v, iout=1.5a, cload=0) channel 2=enable, channel 1=vout okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 5 of 16 www.murata-ps.com/support
okr-t/1.5-w12-c oscillograms C vout = 1.8v step load transient response (vin=12v, vout=1.8v, cload=5x10f x5r 0805 ceramic, total 50f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=4.5v, vout=1.8v, cload=5x10f x5r 0805 ceramic, total 50f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=1.8v, cload=12x10f x5r 0805 ceramic, total 120f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=1.8v, cload=5x10f x5r 0805 ceramic, total 50f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=4.5v, vout=1.8v, cload=5x10f x5r 0805 ceramic, total 50f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=1.8v, cload=12x10f x5r 0805 ceramic, total 120f, iout=1.5a to 0a) top trace=vout, bottom trace=iout okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 6 of 16 www.murata-ps.com/support
okr-t/1.5-w12-c oscillograms C vout = 1.8v step load transient response (vin=4.5v, vout=1.8v, cload=12x10f x5r 0805 ceramic, total 120f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=4.5v, vout=1.8v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=1.8v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=4.5v, vout=1.8v, cload=12x10f x5r 0805 ceramic, total 120f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=4.5v, vout=1.8v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=1.8v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=0a to 1.5a) top trace=vout, bottom trace=iout okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 7 of 16 www.murata-ps.com/support
okr-t/1.5-w12-c oscillograms C vout = 3.3v step load transient response (vin=12v, vout=3.3v, cload=5x10f x5r 0805 ceramic, total 50f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=5.5v, vout=3.3v, cload=5x10f x5r 0805 ceramic, total 50f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=3.3v, cload=12x10f x5r 0805 ceramic, total 120f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=3.3v, cload=5x10f x5r 0805 ceramic, total 50f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=5.5v, vout=3.3v, cload=5x10f x5r 0805 ceramic, total 50f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=3.3v, cload=12x10f x5r 0805 ceramic, total 120f, iout=1.5a to 0a) top trace=vout, bottom trace=iout okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 8 of 16 www.murata-ps.com/support
okr-t/1.5-w12-c oscillograms C vout = 3.3v step load transient response (vin=5.5v, vout=3.3v, cload=12x10f x5r 0805 ceramic, total 120f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=5.5v, vout=3.3v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=3.3v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=5.5v, vout=3.3v, cload=12x10f x5r 0805 ceramic, total 120f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=5.5v, vout=3.3v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=3.3v, cload=10x10f 5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=1.5a to 0a) top trace=vout, bottom trace=iout okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 9 of 16 www.murata-ps.com/support
okr-t/1.5-w12-c oscillograms C vout = 5v step load transient response (vin=12v, vout=5v, cload=5x10f x5r 0805 ceramic, total 50f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=7.5v, vout=5v, cload=5x10f x5r 0805 ceramic, total 50f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=5v, cload=12x10f x5r 0805 ceramic, total 120f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=5v, cload=5x10f x5r 0805 ceramic, total 50f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=7.5v, vout=5v, cload=5x10f x5r 0805 ceramic, total 50f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=5v, cload=12x10f x5r 0805 ceramic, total 120f, iout=1.5a to 0a) top trace=vout, bottom trace=iout okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 10 of 16 www.murata-ps.com/support
okr-t/1.5-w12-c oscillograms C vout = 5v step load transient response (vin=7.5v, vout=5v, cload=12x10f x5r 0805 ceramic, total 120f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=7.5v, vout=5v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=5v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=7.5v, vout=5v, cload=12x10f x5r 0805 ceramic, total 120f, iout=1.5a to 0a) top trace=vout, bottom trace=iout step load transient response (vin=7.5v, vout=5v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=0a to 1.5a) top trace=vout, bottom trace=iout step load transient response (vin=12v, vout=5v, cload=10x10f x5r 0805 ceramic, plus 1x470f, 7m poscap, total 570f, iout=1.5a to 0a) top trace=vout, bottom trace=iout okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 11 of 16 www.murata-ps.com/support
0.15 (3.8) 0.05 (1.3) ref thk 0.067 (1.7) 0.134 (3.4) 0.067 (1.7) 0.134 (3.4) 0.205 (5.2) 0.41 (10.4) 5x 0.047.005 0.21 (5.33) (1.19) 0.42 (10.67) .26 min 0.150 (3.81) 0.14 (3.56) (0.813) 0.11 (2.79) ref pin #1 (viewed from top) recommended footprint 1 2 3 4 5 0.032 typ .002 ref 0.24 (6.1) c l pin #1 pin #5 0.40 (10.16) figure 3. okr-t/1.5-w12-c component locations are typical. 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 2? input/output connections okr-t/1.5-w12-c pin function 1 remote on/off control* 2+v in 3 ground (common) 4+v out 5 trim * the remote on/off can be provided with either positive (p suf? x) or negative (n suf? x) logic. mechanical specifications okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 12 of 16 www.murata-ps.com/support
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 2? carton accommodates four (3) trays of 120 yielding 360 converters per carton. each static dissipative polyethylene foam tray accommodates 120 converters 10.00.25 (254.0) 10.00 .25 (254.0) 2.5.25 (63.5) closed height 0.39 (10.0) 0.63 (16.0) notes: 1. material: dow 220 antistat ethafoam (density: 34-35 kg/m3) 2. dimensions: 252 x 252 x 16 mm 8 x 15 array (120 per tray) 9.92 (252.0) 9.92 (252.0) 0.94 (24.0) 0.33 (8.5) 0.43 (11.0) 0.2 (5.0) 0.2 (5.0) 45 x x4 0.49 (12.5) 6.5 okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 13 of 16 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 safely, 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 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. 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 minimum external output capacitance required for proper operation is 50uf ceramic type. the maximum external output capacitance is 100uf ceramic and 470uf poscap. operating outside of these minimum and maxi- mum limits may affect the performance of the unit. 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. in the ? gure below, the cbus and lbus components simulate a typical dc voltage bus. please note that the values of cin, lbus and cbus will vary according to the speci? c converter model. 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 +vin -vin current probe to oscilloscope + C + C figure 4. measuring input ripple current c1 c1 = 1f c2 = 10f load 2-3 inches (51-76mm) from module c2 r load scope +vout -vout figure 5. measuring output ripple and noise (pard) okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 14 of 16 www.murata-ps.com/support
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 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 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 magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following a time-out period, the pwm will restart, causing the output voltage to begin ramping up to its appropriate value. if the short-circuit condition persists, another shutdown cycle will initiate. this rapid on/off cycling is called hiccup mode. the hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component damage. a short circuit can be tolerated inde? nitely. the hiccup system differs from older latching short circuit systems because you do not have to power down the converter to make it restart. the system will automatically restore operation as soon as the short circuit condi- tion is removed. okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 15 of 16 www.murata-ps.com/support
trim connections r trim r load trim +v out ground r trim (k) = 1.182 v out ? 0.591 output voltage adustment the output voltage may be adjusted over a limited range by connecting an external trim resistor (rtrim) between the trim pin and ground. the rtrim resistor must be a 1/10 watt precision metal ? lm type, 0.5% accuracy or better with low temperature coef? cient, 100 ppm/oc. 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 capaci- tors to trim. okr-t/1.5-w12-c output voltage calculated rtrim () 6 v. 218.5 5 v. 268 3.3 v. 436 2.5 v. 619 1.8 v. 978 1.5 v. 1300 1.2 v. 1940 1.0 v. 2890 0.591 v. (open) r trim (k ? ) = _____________ (v out C 0.591) 1.182 resistor trim equation, okr-t/1.5-w12-c models: 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. your production environment may differ; therefore please thoroughly review these guideli nes 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 okr-t/1.5-w12-c adjustable output 1.5-amp sip-mount dc/dc converters mdc_okr-t/1.5-w12-c.a01.d5 page 16 of 16 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/

▲Up To Search▲

Price & Availability of OKR-T15-W12-C

	To Download OKR-T15-W12-C Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .