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preliminary datasheet ds_dnm24sip10_08142008 features ? high efficiency: 97% @ 24vin, 12v/6a out ? small size and low profile: (sip) 50.8 x 12.7 x 9.5mm (2.00? x 0.50? x 0.37?) ? standard footprint ? voltage and resistor-based trim ? pre-bias startup ? no minimum load required ? output voltage programmable from 5vdc to 15vdc via external resistor ? fixed frequency operation (300khz) ? input uvlo, output otp, ocp ? remote on/off ? remote sense ? iso 9001, tl 9000, iso 14001, qs9000, ohsas18001 certified manufacturing facility ? ul/cul 60950-1 (us & canada), and tuv (en60950-1) - pending applications ? telecom/datacom ? distributed power architectures ? servers and workstations ? lan/wan applications ? data processing applications options ? negative on/off logic delphi dnm24 series non-isolated point of load dc/dc power modules: 20-30vin, 5-15v/10a out the delphi series dnm24s, 20~30v input, single output, non-isolated point of load dc/dc converters are the latest offering from a world leader in power systems technology and manufacturing D delta electronics, inc. the dnm24s series provides a programmable output voltage from 5v to 15v through an external trimming resistor. this product family is available in sip package and provid es 10a of output current in an industry standard footprint and pinout. with creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performance and extremely high reliability under highly stressf ul operating conditions.
ds_dnm24sip10_08142008 2 technical specifications t a = 25c, airflow rate = 300 lfm, v in = 20vdc and 30vdc, nominal vout unless otherwise noted. parameter notes and conditions DNM24S0B0R10NFB min. typ. max. units absolute maximum ratings input voltage (continuous) 0 36 vdc operating temperature refer to figure 27 for the measuring point -40 125 c storage temperature -55 125 c input characteristics operating input voltage 20 24 30 v input under-voltage lockout turn-on voltage threshold 19 v turn-off voltage threshold 17 v maximum input current vin=vin,min to vin,max, io=6a,vo=12v 4.5 a no-load input current vin=24v, io=min load, vo=12v 70 ma off converter input current vin=24v, off converter 3 ma inrush transient vin= vin,min to vin,max, io=io,min to io,max 1 a 2 s recommended input fuse 15 a output characteristics output voltage set point vin=24v, io=io,max -2.0 vo,set +2.0 % vo,set output voltage adjustable range 5 15 v output voltage regulation over line vin=vin,min to vin,max 0.4 % vo,set over load io=io,min to io,max 0.4 % vo,set over temperature ta= -40 to 85 0.5 1 % vo,set total output voltage range over sample load, line and temperature -3 +3 % vo,set output voltage ripple and noise 5hz to 20mhz bandwidth peak-to-peak vin=min to max, io=min to max1f ceramic, 10f tan 80 160 mv rms vin=min to max, io=min to max1f ceramic, 10f tan 30 60 mv output current range vin=24v, vo=5v 0 10 a vin=24v, vo=12v 0 6 a vin=24v, vo=15v 0 4.5 a output voltage over-shoot at start-up vin=min to max, io=io,max 3 % vo,set output short-circuit current (hiccup mode) io,s/c 20 adc dynamic characteristics dynamic load response 10f tan & 1f ceramic load cap, 5a/s,vin=24v ,vo=12v, io, max=6a, no external out capacitor positive step change in output current 50% io, max to 100% io, max 280 mvpk negative step change in output current 100% io, max to 50% io, max 280 mvpk settling time to 10% of peak devitation 50 s dynamic load response 10f tan & 1f ceramic load cap, 5a/s, vin=24v vo=12v, io, max=6a, 2 150uf os-con capacitor positive step change in output current 50% io, max to 100% io, max 130 mvpk negative step change in output current 100% io, max to 50% io, max 130 mvpk settling time to 10% of peak devitation 50 s turn-on transient io=io.max start-up time, from on/off control von/off, vo=10% of vo,set 2 4 8 ms start-up time, from input vin=vin,min, vo=10% of vo,set 2 4 8 ms output voltage rise time time for vo to rise from 10% to 90% of vo,set 2 5 9 ms maximum output startup capacitive load full load; esr R 1m ? 1000 f full load; esr R 10m ? 2000 f efficiency vo=5v vin=24v, io=io,max 93.0 % vo=12v vin=24v, io=io,max 97.0 % vo=15v vin=24v, io=io,max 97.0 % feature characteristics switching frequency 300 khz on/off control, (negative logic) logic low voltage module on, von/off -0.3 1.2 v logic high voltage module off, von/off 2.5 vin,max v logic low current module on, ion/off 10 30 ua logic high current module off, ion/off 1 ma on/off control, (positive logic) logic high voltage module on, von/off vin-2.5 vin,max v logic low voltage module off, von/off -0.3 1.2 v logic high current module on, ion/off 10 30 ua logic low current module off, ion/off 1 ma remote sense range 0.5 v general specifications mtbf io=io,max, ta=25 tbd m hours weight 12 grams over-temperature shutdown refer to figure 27 for the measuring point 125 c
ds_dnm24sip10_08142008 3 electrical characteristics curves figure 1: converter efficiency vs. output current (5.0v output voltage) figure 2: converter efficiency vs. output current (12v output voltage) figure 3: converter efficiency vs. output current (15v output voltage) 70 75 80 85 90 95 123 4567 8910 output current (a) efficiency(%) 20v 24v 30v 80 85 90 95 100 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 output current (a) efficiency(%) 20v 24v 30v 80 85 90 95 100 11.522.533.544.5 output current (a) efficiency(%) 20v 24v 30v
ds_dnm24sip10_08142008 4 electrical characteristics curves figure 4: output ripple & noise at 24vin, 5.0v/10a out figure 5: output ripple & noise at 24vin, 12v/6a out figure 6: output ripple & noise at 24vin, 15v/4.5a out figure 7: turn on delay time at 24vin, 12v/6a out figure 8: turn on delay time at remote on/off,12v/6a out figure 9: turn on using remote on/off with external capacitors (co= 2000 f), 12v/6a out vin vo vo vo remote on/off remote on/off
ds_dnm24sip10_08142008 5 electrical characteristics curves figure 10: typical transient response to step load change at 5a/ s from 100% to 50% of io, max at 24vin, 12.0v out (cout = 1uf ceramic, 10 f tantalum) figure 11: typical transient response to step load change at 5a/ s from 50% to 100% of io, max at 24vin, 12.0v out (cout = 1uf ceramic, 10 f tantalum) figure 12: typical transient response to step load change at 5a/ s from 100% to 50% of io, max at 24vin, 12.0vout (cout = 1uf ceramic, 10 f tantalum) with external 2*150uf os-con capacitors figure 13: typical transient response to step load change at 5a/ s from 50% to 100% of io, max at 24vin, 12.0vout (cout = 1uf ceramic, 10 f tantalum) with external 2*150uf os-con capacitors figure 14: output short circuit current 24vin, 5.0vout (20a/div) figure 15: turn on with prebias 24vin, 12v/0a out, vbias =10.2vdc
ds_dnm24sip10_08142008 6 test configurations v i (+) v i (-) battery 2 47uf os_con l to oscilloscope note: input reflected-ripple current is measured with a simulated source inductance. current is measured at the input of the module. figure 16: input reflected-ripple test setup vo gnd copper strip 10uf tantalum 1uf ceramic scope resistive load note: use a 10 f tantalum and 1 f capacitor. scope measurement should be made using a bnc connector. figure 17: peak-peak output noise and startup transient measurement test setup supply i vi vo gnd io load contact and distribution losses contact resistance figure 18: output voltage and efficiency measurement test setup note: all measurements are taken at the module terminals. when the module is not soldered (via socket), place kelvin connections at module terminals to avoid measurement errors due to contact resistance. % 100 ) ( = ii vi io vo design considerations input source impedance to maintain low-noise and ripple at the input voltage, it is critical to use low esr capacitors at the input to the module. figure 19 shows the input ripple voltage (mvp-p) for various output models using 2x47 uf low esr os-con capacitors (sanyo p/n:35svpd47m, 47uf/35v or equivalent). the input capacitance should be able to handle an ac ripple current of at least: arms vin vout vin vout iout irms ? ? ? ? ? ? ? = 1 0 100 200 300 400 500 03691215 output voltage (vdc) input ripple voltage (mvp-p) figure 19: input ripple voltage for various output models, vo=5v io = 10a vo=12v io = 6a and vo=15v io = 4.5a (cin = 2x47uf os-con capacitors at the input)
ds_dnm24sip10_08142008 7 design considerations (con.) the power module should be connected to a low ac-impedance input source. highly inductive source impedances can affect the stability of the module. an input capacitance must be placed close to the modules input pins to filter ripple current and ensure module stability in the presence of inductive traces that supply the input voltage to the module. safety considerations for safety-agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards. for the converter output to be considered meeting the requirements of safety extra-low voltage (selv), the input must meet selv requirements. the power module has extra-low voltage (elv) outputs when all inputs are elv. the input to these units is to be provided with a maximum 15a of glass type fast-acting fuse in the ungrounded lead. features descriptions remote on/off the dnm series power modules have an on/off pin for remote on/off operation. both positive and negative on/off logic options are available in the dnm series power modules. for positive logic module, connect an open collector (npn) transistor or open drain (n channel) mosfet between the on/off pin and the gnd pin (see figure 20). positive logic on/off signal turns the module on during the logic high and turns the module off during the logic low. when the positive on/off function is not used, leave the pin floating or tie to vin (module will be on). for negative logic module, the on/off pin is pulled high with an external pull-up resi stor (see figure 21) negative logic on/off signal turns the module off during logic high and turns the module on during logic low. if the negative on/off function is not used, leave the pin floating or tie to gnd. (module will be on) rl vo vin on/off gnd i on/off figure 20: positive remote on /off implementation vo vin on/off gnd rpull-up rl i on/off figure 21: negative remote on/off implementation over-current protection to provide protection in an output over load fault condition, the unit is equipped with internal over-current protection. when the over-current protection is triggered, the unit enters hiccup mode. the units operate normally once the fault condition is removed.
ds_dnm24sip10_08142008 8 features descriptions (con.) over-temperature protection the over-temperature protection consists of circuitry that provides protection from thermal damage. if the temperature exceeds the ove r-temperature threshold the module will shut down. the module will try to restart after shutdown. if the over-temper ature condition still exists during restart, the module will shut down again. this restart trial will continue unt il the temperature is within specification remote sense the dnm provide vo remote sensing to achieve proper regulation at the load points and reduce effects of distribution losses on output li ne. in the event of an open remote sense line, the module shall maintain local sense regulation through an internal resistor. the module shall correct for a total of 0.1v of loss. the remote sense line impedance shall be < 10 . rl distribution losses distribution losses distribution losses distribution losses vo vin gnd sense figure 22: effective circuit configuration for remote sense operation output voltage programming the output voltage of the dnm can be programmed to any voltage between 5.021vdc and 15.0vdc by connecting one resistor (shown as rtrim in figure 23) between the trim and gnd pins of the module. without this external resistor, the output voltage of the module is 5.021 vdc. to calculate the value of the resistor rtrim for a particular output voltage vo, please use the following equation: ? ? ? ? ? ? ? ? ? = 1000 021 . 5 vo 10500 rtrim rtrim is the external resistor in ? vo is the desired output voltage for example, to program the output voltage of the dnm module to12vdc, rtrim is calculated as follows: ? ? ? ? ? ? ? ? = 1000 979 . 6 10500 rtrim rtrim = 504.514 ? dnm can also be programmed by applying a voltage between the trim and gnd pins (figure 24). the following equation can be used to determine the value of vtrim needed for a desired output voltage vo: ( ) [ ] 0667 . 0 021 . 5 vo 7 . 0 vtrim ? ? ? = vtrim is the external voltage in v vo is the desired output voltage for example, to program the output voltage of a dnm module to 12 vdc, vtrim is calculated as follows ( ) 0667 . 0 979 . 6 7 . 0 vtrim ? ? = vtrim = 0.2345v figure 23: circuit configuration for programming output voltage using an external resistor figure 24: circuit configuration for programming output voltage using external voltage source
ds_dnm24sip10_08142008 9 the amount of power delivered by the module is the voltage at the output terminals multiplied by the output current. when using the trim feature, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. care should be taken to ensure that the maximum output power of the module must not exceed the maximum rated power ( vo.set x io.max p max ) . voltage margining output voltage margining can be implemented in the dnm modules by connecting a resistor, r margin-up , from the trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, r margin-down , from the trim pin to the output pin for margining-down. figure 25 shows the circuit configuration for output voltage margining. if unused, leave the trim pin unconnected. a calculation tool is available from the evaluation procedure which computes the values of r margin-up and r margin-down for a specific output voltage and margin percentage. vo on/off vin gnd trim q2 q1 rmargin-up rmargin-down rtrim figure 25: circuit configuration for output voltage margining feature descriptions (con. ) table 1 provides rtrim values required for some common output voltages, while table 2 provides value of external voltage source, vtrim, for the same common output voltages. by using a 0.5% tolerance trim resistor, set point tolerance of 2% can be achieved as specified in the electrical specification. table 1 vo (v) rtrim ( ? ) 5.021 open 12 504.514 15 52.21 table 2 vo (v) vtrim (v) 5.021 open 12 0.2345 15 0.0344
ds_dnm24sip10_08142008 10 thermal de-rating heat can be removed by in creasing airflow over the module. to enhance system reliability, the power module should always be operated below the maximum operating temperature. if the temperature exceeds the maximum module temperature, reliability of the unit may be affected. note: wind tunnel test setup figure dimensions are in millimeters and (inches) 12.7 (0.5?) module a ir flow 50.8 ( 2.0? ) facing pwb pwb air velocit y and ambient temperature measured below the module figure 26: wind tunnel test setup thermal considerations thermal management is an important part of the system design. to ensure proper, re liable operation, sufficient cooling of the power module is needed over the entire temperature range of the m odule. convection cooling is usually the dominant mode of heat transfer. hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. thermal testing setup delta?s dc/dc power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encountered in most electronics equipment. this type of equipment commonly uses vertically mounted circuit cards in cabinet racks in which the power modules are mounted. the following figure shows the wind tunnel characterization setup. the power module is mounted on a test pwb and is vertically positioned within the wind tunnel. the height of this fan duct is constantly kept at 25.4mm (1??).
ds_dnm24sip10_08142008 11 thermal curves figure 27: temperature measurement location the allowed maximum hot spot temperature is defined at 125 dnm24s0b0r10nf b output current vs. ambient temperature and air velocity @ vin =24v, vout =5v (worse condition) 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm natural convection figure 28: output current vs. ambient temperature and air velocity@ vin=24v, vo=5.0v(either orientation) dnm24s0b0r10nf b output current vs. ambient temperature and air velocity @ vin =24v, vout =12v (worse condition) 0 1 2 3 4 5 6 7 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) natural convection figure 29: output current vs. ambient temperature and air velocity@ vin=24v, vo=12v(either orientation) dnm24s0b0r10nf b output current vs. ambient temperature and air velocity @ vin =24v, vout =15v (worse condition) 0 1 1 2 2 3 3 4 4 5 5 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) natural convection figure 30: output current vs. ambient temperature and air velocity@ vin=24v, vo=15v(either orientation)
ds_dnm24sip10_08142008 12 mechanical drawing sip package
ds_dnm24sip10_08142008 13 part numbering system dnm 24 s 0b0 r 10 n f b product series input voltage numbers of outputs output voltage package type output current on/off logic option code dnm ~ 10a 24 - 20~30v s - single 0b0 - programmable r - sip 10 -10a n- negative p- positive f- rohs 6/6 (lead free) b - no tracking pin model list model name packaging input voltage output voltage output current on/off logic efficiency 24vin @ 100% load DNM24S0B0R10NFB sip 20v ~ 30v 5.0v ~ 15.0v 4.5a~10a negative 97% (12v/6a) contact: www.delta.com.tw/dcdc usa: telephone: east coast: (888) 335 8201 west coast: (888) 335 8208 fax: (978) 656 3964 email: dcdc@delta-corp.com europe: phone: +41 31 998 53 11 fax: +41 31 998 53 53 email: dcdc@delta-es.com asia & the rest of world: telephone: +886 3 4526107 ext 6220 fax: +886 3 4513485 email: dcdc@delta.com.tw warranty delta offers a two (2) year limited warranty. complete warranty information is listed on our web site or is available upon request from delta. information furnished by delta is believed to be accurate and reliable. however, no responsibility is assumed by delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of delta. de lta reserves the right to revise these specifications at any time, without notice .

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