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datasheet ds_dnt04smd03_12182008 features ? high efficiency: 93.0%@ 5vin, 3.3v/3a out ? small size and low profile: 0.80? x 0.45? x 0.27? (smd) 0.90? x 0.40? x 0.25? (sip) ? standard footprint and pinout ? resistor-based trim ? output voltage programmable from 0.75v to 3.63v via external resistors ? pre-bias startup ? no minimum load required ? fixed frequency operation ? input uvlo, ocp ? remote on/off ? iso 9001, tl 9000, iso 14001, qs 9000, ohsas 18001 certified manufacturing facility ? ul/cul 60950-1 (us & canada) recognized, and tuv (en60950-1) certified ? ce mark meets 73/23/eec and 93/68/eec directives applications ? telecom/datacom ? distributed power architectures ? servers and workstations ? lan/wan applications ? data processing applications options ? positive on/off logic ? sip package delphi dnt04, non-isolated point of load dc/dc power modules: 2.4~5. 5vin, 0.75~3.63vo, 3a out the delphi series dnt04, 2.4-5.5v input, single output, non-isolated point of load dc/dc converters are t he latest offering from a world leader in power systems technology and manufacturing delta electronics, inc. the dnt04 series provides a programmable output voltage from 0.75v to 3.63v using exter nal resistors. this product family is available in surface mount or sip package and provides up to 3a of output current in an industry standard footprint. with creative design technology and optimization of com ponent placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions. the dnt04, 3a modules have excelle nt thermal performance and can provide full output current at up to 85 ambient temperature with no airflow.
ds_dnt04smd3a_12182008 2 technical specifications (t a = 25c, airflow rate = 300 lfm, v in = 5 vdc, nom inal vout unless otherwise noted.) parameter notes and conditions dnt04s0a0s03nfa min. typ. max. units absolute maximum ratings input voltage (continuous) 0 5.8 vdc operating temperature refer to figure 32 for measuring point -40 125 c storage temperature -55 125 c input characteristics operating input voltage vo Q vin ?0.5v 2.4 5.5 v input under-voltage lockout turn-on voltage threshold 2.05 v turn-off voltage threshold 1.9 v maximum input current vin=4.5v, vo=3.3v, io=3a 2.5 a no-load input current 20 30 ma off converter input current 1 ma inrush transient vin=2.4v to 5.5v, io=io, min to io, max 0.1 a 2 s recommended inout fuse tbd a output characteristics output voltage set point vin=5v, io=io, max -2.5 vo,set +2.5 % vo,set output voltage adjustable range 0.7525 3.63 v output voltage regulation over line vin=2.4v to 5.5v 0.2 % vo,set over load io=io,min to io,max 0.2 % vo,set over temperature ta=-40 to 85 0.4 % vo,set total output voltage range over sample load, line and temperature -3.0 +3.0 % vo,set output voltage ripple and noise 5hz to 20mhz bandwidth peak-to-peak full load, 1f ceramic, 10f tantalum 30 50 mv rms full load, 1f ceramic, 10f tantalum 10 15 mv output current range 0 3 a output voltage over-shoot at start-up 1 % vo,set output dc current-limit inception 200 % io output short-circuit current (hiccup mode) io,s/c 1.6 adc (rms) dynamic characteristics dynamic load response 10f tan & 1f ceramic load cap, 2.5a/s positive step change in output current 50% io, max to 100% io, max 220 mv negative step change in output current 100% io, max to 50% io, max 220 mv setting 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 7 ms start-up time, from input vin=vin,min, vo=10% of vo,set 7 ms maximum output startup capacitive load full load; esr R 1m ? 1000 f full load; esr R 10m ? 3000 f efficiency vo=3.3v vin=5v, 100% load 93.0 % vo=2.5v vin=5v, 100% load 90.0 % vo=1.8v vin=5v, 100% load 87.0 % vo=1.5v vin=5v, 100% load 85.0 % vo=1.2v vin=5v, 100% load 83.0 % vo=0.75v vin=5v, 100% load 77.0 % feature characteristics switching frequency 300 khz on/off control, (for negative logic) logic low voltage module on, von/off -0.2 0.3 v logic high voltage module off, von/off 2.5 vin.max v logic low current module on, ion/off 10 a logic high current module off, ion/off 0.2 1 ma on/off control, (for positive logic) logic highvoltage module on, von/off vin.max v logic low voltage module off, von/off -0.2 0.3 v logic high current module on, ion/off 10 a logic low current module off, ion/off 0.2 1 ma general specifications mtbf io=100% of io, max; ta=25c 21.44 m hours weight 2.3 grams
ds_dnt04smd3a_12182008 3 electrical characteristics curves 90 91 92 93 94 95 96 0.511.522.53 out put cur r ent ( a) efficiency (%) 84 86 88 90 92 94 96 0. 5 1 1. 5 2 2. 5 3 out put cur r ent ( a) efficiency (%) figure 1: converter efficiency vs. out put current (5vin/3.3vout) figure 2: converter efficiency vs. out put current (5vin/2.5vout) 82 84 86 88 90 92 0. 5 1 1. 5 2 2. 5 3 out put cur r ent ( a) efficiency (%) 80 82 84 86 88 90 92 0. 5 1 1. 5 2 2. 5 3 out put cur r ent ( a) efficiency (%) figure 3: converter efficiency vs. output current (5vin/1.8vout) figure 4: converter efficiency vs. output current (5vin/1.5vout) 78 80 82 84 86 88 90 0.511.522.53 out put cur r ent ( a) efficiency (%) 74 76 78 80 82 84 86 0. 5 1 1. 5 2 2. 5 3 out put cur r ent ( a) efficiency (%) figure 5: converter efficiency vs. output current (5vin/1.2vout) figure 6: converter efficiency vs. out put current (5vin/0.75vout)
ds_dnt04smd3a_12182008 4 electrical characteristics curves (con.) figure 7: output ripple & noise at 5vin, 3.3v/3a out figure 8: output ripple & noise at 5vin, 2.5v/3a out figure 9: output ripple & noise at 5vin, 1.8v/3a out figure 10: output ripple & noise at 5vin, 1.5v/3a out figure 11: output ripple and noise at 5vin, 1.2v/3a out figure 12: output ripple and noise at 5vin, 0.75v/3a out
ds_dnt04smd3a_12182008 5 electrical characteristics curves (con.) figure 13: turn on delay time at 5vin, 3.3v/3a out top: vout, 2v/div ; bottom: vin , 5v/div. 2ms/div figure 14: turn on delay time at 5vin, 2.5v/3a out top: vout, 2v/div; bottom: vin, 5v/div,.2ms/div figure 15: turn on delay time at 5vin, 1.8v/3a out top: vout, 2v/div; bottom: vin, 5v/div. 2ms/div figure 16: turn on delay time at 5vin, 1.5v/3a out top: vout, 2v/div; bottom: vin , 5v/div. 2ms/div figure 17: turn on delay time at 5vin, 1.2v/3a out top: vout, 2v/div; bottom: vin, 5v/div. 2ms/div figure 18: turn on delay time at 5vin, 0.75v/3a out top: vout, 2v/div; bottom: vin, 5v/div. 2ms/div
ds_dnt04smd3a_12182008 6 electrical characteristics curves figure 19: typical transient response to step load change at 2.5a/ s from 100% to 50% of io, max at 5vin, 3.3vout (cout = 1uf ceramic, 10 f tantalum) figure 20: typical transient response to step load change at 2.5a/ s from 50% to 100% of io, max at 5vin, 3.3vout (cout =1uf ceramic, 10 f tantalum) figure 21: output short circuit current 5vin, 0.75vout 5a/div, 20ms/div figure 22: turn on with prebias: 5vin, 3.3v/0a out, vbias =1.0vdc top: vout , 2.5v/div, bottom :vin, 5v/div, vbias=1v
ds_dnt04smd3a_12182008 7 test configurations v i (+) v i (-) battery 2 100uf tantalum l to oscilloscope note: input reflected-ripple cu rrent is measured with a simulated source inductance. cu rrent is measured at the input of the module. figure 23: 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 24: peak-peak output noise and startup transient measurement test setup. supply i i v i vo gnd io load contact and distribution losses contact resistance figure 25: output voltage and efficiency measurement test setup note: all measurements are tak en 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 capa citors at the input to the module. 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 an adequate time-delay fuse in the ungrounded lead.
ds_dnt04smd3a_12182008 8 features descriptions (con.) output voltage programming the output voltage of the dnt can be programmed to any voltage between 0.75vdc and 3.63vdc by connecting one resistor (shown as rtrim in figure 30) between the trim and gnd pins of the module. without this external resistor, the output voltage of the module is 0.7525 vdc. to calculate the value of the re sistor rtrim for a particular output voltage vo, please use the following equation: ? ? ? ? ? ? ? ? = 5110 7525 . 0 21070 vo rtrim for example, to program the output voltage of the dnt module to 1.8vdc, rtrim is calculated as follows: = ? ? ? ? ? ? ? ? = k rtrim 15 5110 7525 . 0 8 . 1 21070 dnt can also be programmed by apply a voltage between the trim and gnd pins (figure 31). the following equation can be used to determine the value of vtrim needed for a desired output voltage vo: () 7525 . 0 1698 . 0 7 . 0 ? ? = vo vtrim for example, to program the output voltage of a dnt module to 3.3 vdc, vtrim is calculated as follows () v vtrim 267 . 0 7525 . 0 3 . 3 1698 . 0 7 . 0 = ? ? = vo trim gnd rload rtrim figure 28: circuit configuration for programming output voltage using an external resistor features descriptions remote on/off the dnt 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 dnt 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 28). 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 resistor (see figure 29). 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) vo on/off vin gnd q1 rl i on/off figure 26: positive remote on/off implementation vo on/off vin gnd q1 rl rpull- up i on/off figure 27: 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_dnt04smd3a_12182008 9 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 1% tolerance trim resistor, set point tolerance of 2% can be achieved as specified in the electrical specification. table 1 vo (v) rtrim (k ? ) 0.7525 open 1.2 41.973 1.5 23.077 1.8 15.004 2.5 6.947 3.3 3.160 3.63 2.212 table 2 vo (v) vtrim (v) 0.7525 open 1.2 0.6240 1.5 0.5731 1.8 0.5221 2.5 0.4033 3.3 0.2674 3.63 0.2114 vo trim gnd rload vtrim + _ figure 29: circuit configuration for programming output voltage using external voltage source 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 dnt 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 32 shows the circuit configuration for output voltage margining. if unused, leave the trim pin unconnected. a calculation tool is available from the evaluati on 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 30: circuit configuration for output voltage margining
ds_dnt04smd3a_12182008 10 thermal considerations thermal management is an important part of the system design. to ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the modul e. 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 t hat simulate the thermal environments encountered in most electronics equipment. this type of equipment commonly uses vertically mounted circuit card s 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??). thermal derating heat can be removed by increasing 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 (inche s module a ir flow 12.7 (0.5?) 50.8 ( 2.0? ) facing pwb pwb air velocity and ambient temperature measured below the module 25.4 (1.0?) figure 31: wind tunnel test setup thermal curves figure 32: temperature measurement location the allowed maximum hot spot temperature is defined at 125 dnt04s0a0s03(standard) output current vs. ambient temperature and air velocity @vin = 5v,vo=0.75v~3.3v (either orientation) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection ambient temperature ( ) output current (a) figure 33: derating curves, output current vs. ambient temperature and air velocity @ vin=5v, vout=0.75v~3.3v(either orientation)
ds_dnt04smd3a_12182008 11 pick and place location surface- mount tape & reel lead (sn/pb) process re commend temp. profile time ( sec. ) pre-heat temp. 140~180 c 60~120 sec. peak temp. 210~230 c 5sec. ramp-up temp. 0.5~3.0 c /sec. temperature ( c ) 50 100 150 200 250 300 60 0 120 180 240 2nd ramp-up temp. 1.0~3.0 c /sec. over 200 c 40~50sec. cooling down rate <3 c /sec. lead free (sac) process re commend temp. profile temp . time 150 200 90~120 sec. time limited 75 sec. above 220 220 preheat time ramp up max. 3 /sec. ramp down max. 4 /sec. peak temp. 240 ~ 245 25
ds_dnt04smd3a_12182008 12 mechanical drawing smd package sip package (optional)
ds_dnt04smd3a_12182008 13 part numbering system dnt 04 s 0a0 s 03 n f a product series input voltage numbers of outputs output voltage package type output current on/off logic option code dnt- 3a/5a 04 - 2.4v~5.5v s - single 0a0 - programmable r - sip s - smd 03 - 3a 05 - 5a n- negative p- positive f- rohs 6/6 (lead free) a - standard function model list model name package input voltage output voltage output current efficiency 5vin, 3.3vdc full load dnt04s0a0s03nfa smd 2.4v ~ 5.5vdc 0.75v ~ 3.63vdc 3a 93.0% DNT04S0A0R03NFA sip 2.4v ~ 5.5vdc 0.75v ~ 3.63vdc 3a 94.0% dnt04s0a0s05nfa smd 2.4v ~ 5.5vdc 0.75v ~ 3.63vdc 5a 93.5% dnt04s0a0r05nfa sip 2.4v ~ 5.5vdc 0.75v ~ 3.63vdc 5a 93.0% 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: telephone: +41 31 998 53 11 fax: +41 31 998 53 53 email: dcdc@delta-es.tw asia & the rest of world: telephone: +886 3 4526107 x6220 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 pat ent rights of delta. delta reserves the right to revise these specifications at any time, without notice .
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