single output usn d5 models features non-isolated, 5v in , 1.5-3.3v out 8/10a dc/dc?s in sip packages figure 1. simpli ed schematic datel?s new usn d5 series sip?s (single-in-line packages) are non-isolated dc/dc converters that accept a 5v input (4.5v to 5.5v input range) and deliver 1.5v, 1.8v, 2.5v or 3.3v outputs at either 8 or 10 amps. usn d5 sip?s are designed to take on-board 5v power and convert it, with the highest ef? ciency in the smallest space, to any lower voltage required by today?s current-hungry dsp?s, asic?s and cpld?s. usn?s are ideal for true point-of-use power processing. they occupy a mere 0.8 square inches of board space (2" length, 0.4" width, 0.53" height). their fully synchronous, ? xed-frequency (200khz), buck topology delivers high ef? ciency (91% for 3.3v out models), tight regulation (0.1%/0.5% line/load), stable no-load opera- tion, and low output noise (25mvp-p for 1.5/1.8v out models). the fully functional usn?s feature input undervoltage shutdown, output overcur- rent detection, continuous short-circuit protection, a wide-range output-voltage trim function, a remote on/off control pin, and an optional sense pin. usn?s are pin compatible with similar devices from lucent/tyco, artesyn tech- nologies and power-one. usn?s, however, deliver more current (10a vs. 6a), from a smaller package (2.0" vs. 2.5" long), with better accuracy (1% max.), tighter regulation, less noise, and superior temperature performance. if a usn sip is operated at only 6 amps, for example, it can reliably operate up to +65c (with 100lfm air ? ow). if your low-voltage, high-current requirements have made the use of inef? cient linear regulators impractical, take a look at one of datel?s easy-to-use, low-cost usn sip?s. all devices are ul1950/en60950 certi? ed and emc compliant. ul, cb and emc reports are available upon request. innovation and ex c ell e n c e ? ? industry-standard sip pinout shorter (2.0" vs. 2.5") package length 4.5-5.5v input range 1.5/1.8/2.5/3.3v outputs @ 8 or 10 amps non-isolated, fully synchronous, 200khz, buck topology superior performance vs. competitors: ? 8/10 amps vs. 6 amps ? ?% setpoint accuracy ? ef ciencies to 91% ? noise as low as 25mvp-p ? stable no-load operation ? wide-range trimmable output voltage remote on/off control; optional sense pin power-good pin and "lucent-compatible" on/off control available en60950 and ul1950 certi ed emc compliant datel, inc., mans? eld, ma 02048 (usa) tel: (508)339-3000, (800)233-2765 fax: (508)339-6356 email: sales@datel.co m internet: www.datel.com +input common 10k ? pwm controller current sense reference & error amp on/off control trim +output +sense (optional) common ? ? for devices with the sense-pin option ("r" suf x), the feedback path is through the +sense pin and not the +output pin. .com .com .com 4 .com u datasheet
12345 7 6891011 2.00 (50.08) 0.53 (13.46) 0.40 (10.16) 0.24 (6.10) 0.160 (4.06) 0.05 (1.27) 0.05 (1.27) 0.400 (10.16) 4 eq. sp. @ 0.100 (2.54) 0.500 (12.70) 5 eq. sp. @ 0.100 (2.54) 1.000 (25.40) dimensions are in inches (mm) 0.180 (4.57) 0.025 (0.64) usn series non-isolated, 12-33w sip dc/dc converters 2 performance speci cations and ordering guide ? typical at t a = +25? under nominal line voltage and full-load conditions, unless otherwise noted. all models are tested and speci ed with an external 220? input capacitor with a 100m ? esr and a 1.28arms ripple-current rating, as well as a 220? output capacitor with a 100m ? esr. see i/o filtering and noise reduction for details. ? usn-1.5/8-d5 1.5 8 25 50 ?.1% ?.625% 5 4.5-5.5 50/2890 80% 83% b4, p50 usn-1.5/10-d5 1.5 10 25 50 ?.1% ?.625% 5 4.5-5.5 50/3570 80% 84% b4, p50 usn-1.8/8-d5 1.8 8 25 50 ?.1% ?.625% 5 4.5-5.5 50/3430 80% 84% b4, p50 usn-1.8/10-d5 1.8 10 25 50 ?.1% ?.625% 5 4.5-5.5 50/4190 80% 86% b4, p50 usn-2.5/8-d5 2.5 8 30 60 ?.1% ?.5% 5 4.5-5.5 50/4550 85% 88% b4, p50 usn-2.5/10-d5 2.5 10 30 60 ?.1% ?.5% 5 4.5-5.5 50/5620 85% 89% b4, p50 usn-3.3/8-d5 3.3 8 30 60 ?.1% ?.5% 5 4.5-5.5 50/5800 87% 91% b4, p50 usn-3.3/10-d5 3.3 10 30 60 ?.1% ?.5% 5 4.5-5.5 50/7250 87% 91% b4, p50 r/n (mvp-p) ? regulation (max.) ef ciency package v out i out v in nom. range i in ? (case, model (volts) (amps) typ. max. line load ? (volts) (volts) (ma) min. typ. pinout) output input mechanical specifications pin function p50* 1 +output 2 +output 3 no pin** 4 +output 5 common 6 common 7 +input 8 +input 9 no pin 10 trim 11 on/off control i/o connections case b4 output current (amps) ambient temperature ( ? c) ?40 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 9 8 7 6 5 4 3 2 1 0 still air 100lfm air flow 200lfm air flow 300lfm air flow temperature derating for 8 amp models v in = nominal output current (amps) ambient temperature ( ? c) 12 10 8 6 4 2 0 temperature derating for 10 amp models v in = nominal ?40 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 still air 100lfm air flow 200lfm air flow 300lfm air flow ? ripple/noise (r/n) is tested/speci ed over a 20mhz bandwidth. output noise may be further reduced by installing additional external output capacitors. see i/o filtering and noise reduction. ? these devices have no minimum load requirements and will regulate under no-load conditions. ? nominal line voltage, no-load/full-load conditions. part number structure non-isolated sip output con guration: u = unipolar nominal output voltage: 1.5, 1.8, 2.5 or 3.3 volts maximum rated output current in amps input voltage range: d5 = 4.5 to 5.5 volts (5v nominal) u sn 10 - / d5 r - 1.8 r suf x: remote sense (pin 3 installed) * see functional options in technical notes. ** pin 3 (sense) installed for r suf x models. preliminary temperature derating .com .com .com .com 4 .com u datasheet
usn models non-isolated, 12-33w sip dc/dc converters 3 input input voltage range 4.5 to 5.5 volts (5v nominal) input current: normal operating conditions see ordering guide standby/off mode 50? typical, 200? maximum input ripple current 50map-p input filter type capacitive (66?) overvoltage protection none reverse-polarity protection none undervoltage shutdown 3.2-3.9 volts on/off control ? ? on = open or 2.4v to +v in , i in max. <400? off = 0-0.8v, i in max. <600? output v out accuracy (50% load) ?% maximum minimum loading ? no load v out trim range: ? trim pin tied to +output: 1.5v models tbd 1.8v models v out = 1.50 volts (?7%) 2.5v models v out = 1.77 volts (?9%) 3.3v models v out = 1.80 volts (?5%) trim pin tied to common: 1.5v models tbd 1.8v models v out = 3.0 volts (+67%) 2.5v & 3.3v models v out = 3.6 volts (+44% and +9%) ripple/noise (20mhz bw) ? see ordering guide line/load regulation see ordering guide ef ciency ? see ordering guide overcurrent detection and short-circuit protection: ? ? current-limiting detection point: 8 amp models 10-12 amps 10 amp models 13-15 amps short-circuit detection point <80% of rated output voltage sc protection technique latched shutdown dynamic characteristics transient response (50% load step) 50?ec to ?.5% of nal value start-up time: ? v in to v out 900?ec on/off to v out 1msec switching frequency 200khz (?8khz) environmental mtbf: bellcore, ground xed, full power, 100lfm air ow 8a outputs (+50? air) 6 million hours 10a outputs (+45? air) 7 million hours operating temperature: ? (ambient, 100lfm air ow) without derating 8a/10a 40 to +45/50? with derating to +100? (see derating curves) storage temperature ?0 to +105? performance/functional speci cations typical @ t a = +25? under nominal line voltage and full-load conditions unless noted. ? ? all models are tested and speci ed with an external 220? input capacitor with a 100m ? esr and a 1.28arms ripple-current rating, as well as a 220? output capacitor with a 100m ? esr rating. ? see technical notes/graphs for details. ? the on/off control is designed to be driven with open-collector logic or the application of appropriate voltages (referenced to common, pins 5 and 6). applying a voltage to the on/off control pin (pin 11) when no input voltage is applied to the converter may cause permanent damage. ? all models are stable and regulate within spec under no-load conditions. ? output noise may be further reduced with the installation of additional external output capacitors. see technical notes. ? if an output short circuit results in a latched shutdown, the converter will have to be re- started by cycling either the input voltage or the on/off control pin. technical notes input voltage: continuous 7 volts transient (100msec) 8 volts on/off control pin (pin 11) 7 volts input reverse-polarity protection none output overvoltage protection none output current current limited. devices can withstand sustained output short circuits without damage. storage temperature ?0 to +105? lead temperature (soldering, 10 sec.) +300? these are stress ratings. exposure of devices to any of these conditions may adversely affect long-term reliability. proper operation under conditions other than those listed in the performance/functional speci cations table is not implied. absolute maximum ratings return current paths the usn 12-33w d5 sip s are non-isolated dc/dc converters. their two common pins (pins 5 and 6) are connected to each other internally (see figure 1). to the extent possible (with the intent of minimizing ground loops), input return current should be directed through pin 6 (also referred to ?nput or input return), and output return current should be directed through pin 5 (also referred to as ?utput or output return). any on/off control signals applied to pin 11 (on/off control) should be referenced to common (speci cally pin 6). i/o filtering and noise reduction all models in the usn 12-33w d5 series are tested and speci ed with external 220? input capacitors (100m ? esr, 1.28arms ripple-current rating) and external 220? (100m ? esr) output capacitors. in critical applications, input/output ripple/noise may be further reduced by installing additional, external i/o caps. physical dimensions 2" x 0.40" x 0.53" (50.8 x 10.2 x 13.5mm) package open-frame, single-in-line (sip) pin: material 0.025" (0 .635mm) square bronze with tin-lead plate over nickel underplate length 0.180" (4.57mm) weight 0.3 ounces (8.5gm) flamability rating ul94v-0 .com .com .com .com 4 .com u datasheet
usn series non-isolated, 12-33w sip dc/dc converters external input capacitors serve primarily as energy-storage devices. they should be selected for bulk capacitance (at appropriate frequencies), low esr, and high rms-ripple-current ratings. the switching nature of modern dc/dc converters requires that the dc input voltage source have low ac impedance, and highly inductive source impedances can affect system stability. your speci c system con guration may necessitate additional considerations. output ripple/noise (also referred to as periodic and random deviations or pard) can be reduced below speci ed limits using ltering techniques, the simplest of which is the installation of additional external output capacitors. output capacitors function as true lter elements and should be selected for bulk capacitance, low esr, and appropriate frequency response. any scope measurements of pard should be made directly at the dc/dc output pins with scope probe ground less than 0.5" in length. all external capacitors should have appropriate voltage ratings and be located as close to the converters as possible. temperature variations for all relevant parameters should be taken into consideration. the most effective combination of external i/o capacitors will be a function of your line voltage and source impedance, as well as your particular load and layout conditions. our applications engineers can recommend potential solutions and discuss the possibility of our modifying a given device s internal ltering to meet your speci c requirements. contact our applications engi- neering group for additional details. input fusing usn 12-33w d5 sip series dc/dc converters are not internally fused. certain applications and or safety agencies may require the installation of fuses at the inputs of power conversion components. for datel usn d5 sip series dc/dc's, you should use either slow-blow or normal-blow fuses with values no greater than the following. model fuse value usn-1.5/8-d5 6.5 amps usn-1.5/10-d5 7.5 amps usn-1.8/8-d5 7.5 amps usn-1.8/10-d5 9 amps usn-2.5/8-d5 10 amps usn-2.5/10-d5 12 amps usn-3.3/8-d5 12.5 amps usn-3.3/10-d5 15 amps start-up time the v in to v out start-up time is the interval between the time at which a ramping input voltage crosses the lower limit of the speci ed input voltage range (4.5 volts) and the fully loaded output voltage enters and remains within its speci ed accuracy band. actual measured times will vary with input source impedance, external input capacitance, and the slew rate and nal value of the input voltage as it appears to the converter. the on/off to v out start-up time assumes the converter is turned off via the remote on/off control with the nominal input voltage already applied to the converter. the speci cation de nes the interval between the time at which the converter is turned on and the fully loaded output voltage enters and remains within its speci ed accuracy band. see typical performance curves for details figure 2. driving the standard on/off control pin 4 input overvoltage and reverse-polarity protection usn d5 sip series dc/dc converters do not incorporate either input over- voltage or input reverse-polarity protection. input voltages in excess of the listed absolute maximum ratings and input polarity reversals of longer than "instantaneous" duration can cause permanent damage to these devices. dynamic control of the on/off function is best accomplished with a mechanical relay or open-collector/open-drain drive circuit . the drive circuit should be able to sink appropriate current when activated and withstand appropriate voltage when deactivated. applying an external voltage to the on/off control pin when no input power is applied to the converter can cause permanent damage to the converter. the on/off control function, however, is designed such that the converter can be disabled (control pin pulled low) while input power (system 5v power) is ramping up and then "released" once the input has stabilized. the time dura- tion between the point at which the converter is released and its fully loaded output settles to within speci ed accuracy can be found in the performance/ functional speci cations table. see start-up time for more details. the usn 12-33w d5 sip series converters are also available with a "lucent compatible" on/off control function. (contact datel for model numbers and availability.) on/off control the on/off control pin may be used for remote on/off operation. usn d5 sip series dc/dc converters are designed so that they are enabled when the control pin is pulled high (+2.4v to +v in applied) or left open (normal mode) and disabled when the control pin is pulled low (to less than +0.8v relative to common). as shown in figure 2, all models have internal 10k ? pull-up resistors to v in (+input). +input common on/off control 10k ? +input common on/off control 2k ? 665 ? figure 3. driving the "lucent compatible" on/off control pin .com .com .com .com 4 .com u datasheet
usn models non-isolated, 12-33w sip dc/dc converters output voltage trimming allowable trim ranges for each model in the usn d5 sip series are listed in the performance/functional speci cations table. trimming is accomplished with either a trimpot or a single xed resistor. the trimpot should be con- nected between +output and common with its wiper connected to the trim pin as shown in figure 4 below. a trimpot can be used to determine the value of a single xed resistor which should be connected, as shown in figure 5, between the trim pin and +output to trim down the output voltage, or between the trim pin and common to trim up the output voltage. fixed resistors should have absolute tcr s less than 100ppm/ c to ensure stability. the equations below can be used as starting points for selecting speci c trim-resistor values. recall that untrimmed devices are guaranteed to be 1% accurate. figure 5. trim connections using fixed resistors note: install either a xed trim-up resistor or a xed trim-down resistor depending upon desired output voltage. output overvoltage protection usn d5 sip series dc/dc converters do not incorporate output overvoltage protection. in the extremely rare situation in which the device s feedback loop is broken, the output voltage may run to excessively high levels (v out = v in ). if it is absolutely imperative that you protect your load against any and all possible overvoltage situations, voltage limiting circuitry must be provided external to the power converter. output overcurrent detection overloading the output of a power converter for an extended period of time will invariably cause internal component temperatures to exceed their maximum ratings and eventually lead to component failure. high-current- carrying components such as inductors, fet's and diodes are at the highest risk. usn d5 sip series dc/dc converters incorporate an output overcur- rent detection and shutdown function that serves to protect both the power converter and its load. when the output current exceeds the maximum rating by 20% (typical) to 35% (maximum), the internal overcurrent-detection circuit limits output cur- rent. if the overload condition forces v out to fall below 80% of rated output, the short-circuit detection circuit will latch the dc/dc into an off state. the latched condition can be reset by cycling the input voltage to the converter or by cycling the on/off control pin. figure 4. trim connections using a trimpot load 20k ? 5-10 tu r n s +input common +output trim common trim down trim up load +input common +output trim common up v o ? 1.8 r t (k ? ) = 3.14 down 1.8 ? v o r t (k ? ) = ? 2.21 ? 2.21 2.55(v o ? 1.23) up v o ? 3.3 r t (k ? ) = 5.512 down 3.3 ? v o r t (k ? ) = ? 1.74 ? 1.74 4.46(v o ? 1.24) up v o ? 2.5 r t (k ? ) = 6.983 down 2.5 ? v o r t (k ? ) = ? 4.42 ? 4.42 5.677(v o ? 1.23) usn-1.8/8-d5, usn-1.8/10-d5 trim equations usn-2.5/8-d5, usn-2.5/10-d5 trim equations usn-3.3/8-d5, usn-3.3/10-d5 trim equations note: resistor values are in k ? . accuracy of adjustment is subject to tolerances of resistors and factory-adjusted, initial output accuracy. v o = desired output voltage. 5 functional options usn series sip s have been designed so that a ?ower-good?function can be installed on pin 9 (contact datel). standard models do not have a pin in the pin 9 position. also, the standard polarity of the usn s on/off control function (pin 11 open or pulled high = on) complies with industry standards. nevertheless, it is not compatible with the on/off polarity of the lucent/tyco nh020 series sip s (pin 9 open = off). please contact datel if you would like us to modify devices to be lucent compatible. .com .com .com .com 4 .com u datasheet
typical performance curves 91.5 90.5 89.5 88.5 87.5 86.5 85.5 usn-1.8/10-d5 efficiency vs. line and load 12345678910 load current (amps) efficiency ( % ) v in = 4.5v v in = 5.0v v in = 5.5v 92.5 91.5 90.5 89.5 88.5 87.5 usn-2.5/10-d5 efficiency vs. line and load 12345678910 load current (amps) efficiency ( % ) v in = 4.5v v in = 5.0v v in = 5.5v 93 92 91 90 89 88 87 usn-2.5/8-d5 efficiency vs. line and load 1 1.8 2.6 3.3 4.1 4.9 5.7 6.4 7.2 8 load current (amps) efficiency ( % ) v in = 4.5v v in = 5.0v v in = 5.5v 90 89 88 87 86 85 84 83 usn-1.8/8-d5 efficiency vs. line and load 12 34 5 6 78 load current (amps) efficiency ( % ) v in = 4.5v v in = 5.0v v in = 5.5v usn series non-isolated, 12-33w sip dc/dc converters 6 remote sense (option) usn d5 sip series dc/dc converters offer a sense option (pin 3) to assist in point-of-use regulation, by overcoming moderate ir drops in conductors or cabling. since these are non-isolated devices, which generally utilize a ground plane, sense is only provided for the +output. the remote sense line, which is part of the feedback control-loop regulating the output, carries very little current and therefore requires a minimal cross sectional area conductor. as such, it is not a low impedance point and must be treated with care in layout and cabling. sense lines should be run adjacent to signals?referably ground. in cables and discrete wiring applications, twisted pair or other techniques should be implemented. note: for "r-suf x" models, the +output and +sense lines are not inter- nally connected to each other. therefore, if the sense function is not used for remote regulation, the user must connect the +sense to +output at the dc/dc converter pins. the sense function is capable of compensating for voltage drops between the +output and +sense pins that do not exceed 10% of v out . [v out (+) ?common] ?[sense(+) ?common] 10%v out power derating is based on maximum output current and voltage at the converter's output pins. use of trim and sense functions can cause output voltage to increase, thereby increasing output power beyond the usn's speci ed rating. therefore: (v out at pins) x (i out ) rated output power .com .com .com .com 4 .com u datasheet
95 94 93 92 91 90 89 88 usn-3.3/10-d5 efficiency vs. line and load 12345678910 load current (amps) efficiency ( % ) v in = 4.5v v in = 5.0v v in = 5.5v 93.5 92.5 91.5 90.5 89.5 88.5 87.5 86.5 usn-3.3/8-d5 efficiency vs. line and load 1 1.8 2.6 3.3 4.1 4.9 5.7 6.4 7.2 8 load current (amps) efficiency ( % ) v in = 4.5v v in = 5.0v v in = 5.5v usn series non-isolated, 12-33w sip dc/dc converters datel makes no representation that the use of its products in the circuits described herein, or the use of other technical info rmation contained herein, will not infringe upon existing or future patent rights. the descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci cations are subject to change without notice. the datel logo is a registered datel, inc. trademark. datel (uk) ltd. tadley, england tel: (01256)-880444 datel s.a.r.l. montigny le bretonneux, france tel: 01-34-60-01-01 datel gmbh mnchen, germany tel: 89-544334-0 datel kk tokyo, japan tel: 3-3779-1031, osaka tel: 6-6354-2025 datel, inc. 11 cabot boulevard, mans eld, ma 02048-1151 tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 internet: www.datel.com email: sales@datel.com iso 9001 registered innovation and ex c ell e n c e ? ? ds-0496a 4/01 7 typical performance curves typical start-up from enable (v in = nominal, full-load, 220f intput capacitor, 220f output capacitor.) typical start-up from v in (v in = nominal, full-load, 220f intput capacitor, 220f output capacitor.) enable v out 400sec/div v out v in 400sec/div .com .com .com 4 .com u datasheet
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