email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 1 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com for full details go to www.murata-ps.com/rohs $ www.murata-ps.com features high output 15a 3.3v 5%, 5/12v 10% input regulation 0.4% line and load industry standard pin con? guration high ef? ciency to 91% remote sense, trim and enable short circuit protection mtbf 2.9 million hours output voltage trimmable down to 0.6v using the optional voltage reference can source and sink output current this product is not fuse protected. user is responsible for providing system pro- tection. consult factory for application information. specifications * s151-03 s151-05 s151-12 input specifications input voltage range 3.3v 10% 5.0v 10% 12v 10% measured at +vin pin external input capacitor minimum 680f see also note on pg 9 and charts on pg 7 output specifications standard output voltages 0.8v outputs 0.8v and 1.0v trimmable down to 0.6v using the on-board voltage refer- ence (option 7 or f, see pg 2 and trimming equations on pg 8). standard setpoint accuracy varies from 1.5% at the low end of the output voltage range, to 3% at the high end. (see chart on pg 2) contact factory for tighter tolerances. see note on pg 8 for trimming to different voltages. 0.9v 1.0v 1.2v 1.2v 1.5v 1.5v 1.5v 1.8v 1.8v 1.8v output current 15a 15a 15a** 200 lfm at 70c (see also derating curves page 5-6) load regulation 0.5% 0 to 15a load line regulation 0.5% over speci? ed input voltage range external output capacitor >150f with maxesr = 100m see also note on pg 9 short circuit protection 18a (at 70c) to 32a (at -40c) general specifications enable *** on-open or low / off-high (max 15v) efficiency 90% typical see ef? ciency curves on pg 4 isolation non-isolated switching frequency 300khz fixed approvals and standards ul 94v-0 protection fusing unit is not fused. operating temperature **** -40c to 70c 200 lfm at 70c (see also derating curves) storage temperature -40c to 85c non-condensing weight 0.4 oz (11.3 gm) mtbf 2.7 million hours per rac prism at 50c ambient and 200 lfm * all speci? cations are typical at nominal input, full load at 25c unless otherwise stated. ** max 10a for 5.0v output. *** pull below 0.4v and sink greater than 50 a or leave open to enable the sip; pull above 2v (do not exceed 15v) and source g reater than 150 a to disable the sip. **** the output capacitors must meet the max esr = 100 m requirement over the operating temperature range.
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 2 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com initial setpoint tolerance initial setpoint tolerance for 3.3v and 12v input sips initial setpoint tolerance for 5v input sips part number coding pin assignment * pin is present only when feature is selected. input voltage 03 = 3.3v 05 = 5v 12 = 12v 05 s151 2 0 set point tolerance 0 = factory standard (see initial setpoint tolerances) mechanical options 2 = vertical top side pins (standard) consult factory for other options model number xyz feature options b = remote sense, trim and enable (standard) consult factory for other options pin length b = .145 inch (standard) consult factory for other options output voltage xyz = x.yz volts b b - - connector pin function connector pin function j1 1 vout j2 1 ground 2 vout 2 vin 3* remote sense (empty optional) 3 vin 4 vout 4* empty (reference voltage optional) 5 ground 5 trim 6 enable
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 3 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com mechanical options 2 .03 .03 mech option #2 (standard) .435 max .255 max .110 max 2.77 (70.4) max .540 (13.72) max 12345 123 56 .155 min 1.800 (45.72) .40 (10.2) .025 x .025 (0.64 x 0.64) j1 j2 .62 (15.7) max 12345 123 pin length option .02 ( .5) 1.400 (35.56) .100 (2.54) typ j1 j2 to p s i d e 4 note 3 2.650 (67.35) .050 (1.27) * recommended customer hole size 0.046 .003 1. dimensions are in inches and (millimeters). 2. tolerances: (unless otherwise noted) 3. pin is present only if feature is selected. inches .xx .020 .xxx .010 millimeters .x 0.5 .xx 0.25 pin: .002 0.05 mechanical dimensions
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 4 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com efficiency curves at 25c
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 5 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com derating curves no derating needed at 70c with 200 lfm airflow or higher. * * extended operation at greater than rated current may degrade reliability.
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 6 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com derating curves
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 7 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com input ripple current approximate ripple current ratings required for input bulk capacitor
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 8 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com resistor trim equations
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 9 of 10 s151-084-s151-00 dc/dc converter www.murata-ps.com external capacitance for sip products a ll sip products require external capacitance to be placed on the system board that the sip will be designed into. this application note is an attempt to explain how to translate datasheet information and apply it to a system level board design. i nput capacitance a lthough input capacitance value is not critical, the input capacitors must be capable of storing fairly large amounts of energy. this means, for example, small ceramic capacitors would be inappropriate. the primary criteria, though, for choosing the input capacitors is ac ripple current rating. the sip datasheet contains a chart showing ripple current vs. output current (or output power). the system designer determines the maximum sip output current required from the sip. based on that number, the chart will show a corresponding ripple current rating the designer needs to plan for when choosing input capacitors. example using sip s151-05 for 1.5 v output: the designer knows the s151 output current will be maximum 12.5a in his application. the ripple current chart (5v input) shows a 7a rating required for the input capacitor. also known is that the capacitor the designer hopes to use has a ripple current rating o f 3a. therefore, the designer must use three of the chosen capacitors in parallel for a total ripple current capab ility of 9a. this will adequately cover the 7a need. o utput capacitance the only requirement for capacitance value is for basic circuit stability of the sip. that value is s pecified on the sip datasheetusually 150f. the other consideration for the output capacitor is the total esr (equivalent series resistance). as with ripple current, every capacitor has a specified esr. when using multiple capacitors in parallel, this esr is added exactly like parallel resistors. therefore, more capacitors mean less esr. the sip datasheet s pecifies a maximum total esr necessary for optimum sip performance. the designer may also choose to add more capacitance to reduce output ripple and noise. example : the datasheet specifies a maximum esr of 100m 7 for output capacitance. the system designer wants to use a capacitor with a specified esr of 130m 7 . since 130m 7 is more than the needed 100m 7 , two capacitors must be used in parallel for a total effective esr of 65m 7 . generally, good, low esr bulk capacitors are recommended for both input and output capacitance so that fewer capacitors are needed since board real estate is usually an important factor in today's designs.
email: sales@murata-ps.com 30 apr 2010 mdc_s151-084-s151-00.b01 page 10 of 10 s151-084-s151-00 dc/dc converter 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. ? 2010 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/locations impact on output voltage ripple and transient response if the customers application requires a very low output voltage ripple and / or very low o utput voltage overshoot / undershoot during transients, then the guidelines previously shown need to be exceeded and good layout practices become mandatory. by using four 330f oscon capacitors, each having esr = 17m 7 , the output voltage ripple can be decreased to 50mvpk-pk on a 1.2v output sip. also during a transient load condition (load current steps from 20% to 100% and back, at 2 a / sec) the output voltage d oes not overshoot / undershoot more than 100mv. w hen fast and deep transient loads are expected, the input capacitor becomes important as well, especially if the sip is far from its input voltage source. capacitors having as m uch as 2000f and combined esr lower than 20m 7 might be needed. p ractical results heavily depend on physical layout and specific load conditions. for critical a pplications the customer is encouraged to consult with the manufacturer.
|
