datel, inc., mans eld, ma 02048 (usa) ? tel: (508)339-3000, (800)233-2765 fax: (508)339-6356 ? email: sales@datel.com ? internet: www.datel.com single output unr series features figure 1. simpli ed schematic innovation and ex c ell e n c e ? ? as supply voltages trend lower and load currents increase, centralized power becomes more impractical. the tight accuracy, low noise and quick transient response demanded by today's low voltage cpu's, asic's and dsp's make power processing at the point of use the only viable solution. the unr 12-33w series provides a complete line of non-isolated dc/dc converters to satisfy this require- ment. with input voltages of 5v (-d5 models) and 12v (-d12 models) these convert- ers offer standard output voltages of 1.2, 1.5, 1.8, 2.5 and 3.3 volts and up to 10 amps of output current in both through-hole and surface-mount 1" x 2" metal cases. with on/off control and output voltage trim capability as standard features, these non-isolated converters exploit full synchronous recti cation, planar magnetics, and 100% automated assembly to deliver high ef ciencies (to 91%) and low noise at low cost. these versatile dc/dc s are fully line and load regulated. they feature quick transient response (50?ec), user-optional on/off control (for power sequencing), and output overcurrent detection and shutdown ("hiccup" technique with auto- recovery). their impressive guaranteed ef ciencies enable them to deliver fully rated output power from ?0 to +50/55? (ambient) without supplemental cooling. if your high current requirements have made the use of inef cient linear regula- tors impractical, take a look at one of datel s new switching buck regulators. their high ef ciency, ease-of-use, long-term reliability, and overall cost effectiveness will impress you. safety agency approvals and emc characterizations are currently in progress. +v in +v out input return logic ground on/off control pwm controller voltage boost reference & error amp overcurrent detection output return v out trim +v cc non-isolated, 1.2/1.5/1.8/2.5/3.3v out 8 and 10 amp dc/dc converters input ranges of 4.75-5.5v or 10.8-13.6v output voltages of 1.2/1.5/1.8/2.5/3.3v 8 and 10 amp output current models v out user-trimmable from 1.28v to 3.6v non-isolated, full synchronous topology 1" x 2" through-hole or smt package gull-wing leads/standard re ow for smt high ef ciency to 91%; low noise 340khz switching; planar magnetics 40 to +40/50/60? ambient operation with no derating remote on/off control; output overcurrent detection iec950/en60950/ul1950 approval ? ? ? ? ? ? ? ? ? ? ? ? ? ? -d5 models only.
unr series non-isolated, 12-33w, 5 & 12v-input dc/dc converters mechanical specifications 2.00 (50.80) 4 3 2 1 8 7 6 5 9 0.10 (2.54) 0.110 (2.79) 0.100 (2.54) 0.300 (7.62) 0.500 (12.70) top view 1.00 (25.40) 0.800 (20.32) 4 eq. sp. @ 0.200 (5.08) 0.060 (1.52) 0.055 (1.40) 0.015 (0.38) 0.110 (2.79) 0.015 (0.38) 0.43 (10.92) dimensions are in inches (mm) insulated base metal case case c18 performance speci cations and ordering guide ? output input non-isolated output con guration: u = unipolar nominal output voltage: 1.2, 1.5,1.8, 2.5 or 3.3 volts maximum rated output current in amps input voltage range: d5 = 4.75 to 5.5 volts (5v nominal) d12 = 10.8 to 13.6 volts (12v nominal) u nr 10 - / d5 sm - 1.8 packaging: t = through-hole package sm = surface-mount package 2 package v out i out r/n (mvp-p) ? regulation (max.) v in nom. range i in ? ef ciency (case, model (volts) (amps) typ. max. line load ? (volts) (volts) (ma/a) min. typ. pinout) unr-1.2/10-d5t 1.2 10 tbd tbd 0.1% 0.5% 5 4.75-5.5 tbd tbd tbd c16a2, p23 unr-1.2/10-d5sm 1.2 10 tbd tbd 0.1% 0.5% 5 4.75-5.5 tbd tbd tbd c18, p25 unr-1.5/10-d5t 1.5 10 tbd tbd 0.1% 0.5% 5 4.75-5.5 tbd tbd tbd c16a2, p23 unr-1.5/10-d5sm 1.5 10 tbd tbd 0.1% 0.5% 5 4.75-5.5 tbd tbd tbd c18, p25 unr-1.8/10-d5t 1.8 10 70 100 0.1% 0.5% 5 4.75-5.5 150/4190 82% 86% c16a2, p23 unr-1.8/10-d5sm 1.8 10 40 80 0.1% 0.5% 5 4.75-5.5 150/4190 82% 86% c18, p25 unr-2.5/10-d5t 2.5 10 75 100 0.1% 0.5% 5 4.75-5.5 150/5620 85% 89% c16a2, p23 unr-2.5/10-d5sm 2.5 10 75 100 0.1% 0.5% 5 4.75-5.5 150/5620 85% 89% c18, p25 unr-3.3/8-d5t 3.3 8 40 80 0.1% 0.5% 5 4.75-5.5 100/5470 88% 92% c16a1, p23 unr-3.3/8-d5sm 3.3 8 40 80 0.1% 0.5% 5 4.75-5.5 100/5470 88% 92% c18, p25 unr-3.3/8-d12t 3.3 8 40 100 0.25% 0.875% 12 10.8-13.6 50/2420 86% 91% c16a1, p23 unr-3.3/8-d12sm 3.3 8 40 100 0.25% 0.875% 1 2 10.8-13.6 50/2420 86% 91% c18, p25 unr-3.3/10-d5t 3.3 10 40 80 0.1% 0.5% 5 4.75-5.5 150/7250 86% 91% c16a2, p23 unr-3.3/10-d5sm 3.3 10 50 100 0.1% 0.5% 5 4.75-5.5 150/7250 86% 91% c18, p25 unr-3.3/10-d12t 3.3 10 70 120 0.25% 0.875% 1 2 10.8-13.6 90/3090 86% 89% c16c2, p23 unr-3.3/10-d12sm 3.3 10 70 120 0.25% 0.875% 12 10.8-13.6 90/3090 86% 89% tbd, p25 i/o connections pin function p23 function p25 1 logic ground logic ground 2 on/off control on/off control 3 +output n.c. 4 trim n.c. 5 output return +output 6 input return trim 7 +input output return 8 no pin input return 9 no pin +input ? typical at t a = +25c under nominal line voltage and full-load conditions, unless otherwise noted. all models are tested and speci? ed with an external 22f output capacitor with a 200m ? esr and a 470f input capacitor with 6arms ripple-current rating and 20m ? esr. see i/o filtering and noise reduction for more details. ? ripple/noise (r/n) is tested/speci? ed over a 20mhz bandwidth. output noise may be further reduced by installing additional external output caps. 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. 0.10 (2.54) metal case 2.00 (50.80) 0.20 min (5.08) see notes insulated base 1 2 3 4 6 7 5 1.800 (45.72) 0.10 (2.54) 0.300 (7.62) bottom view dimensions in inches (mm) 1.00 (25.40) 0.800 (20.32) 4 eq. sp. @ 0.200 (5.08) 0.10 (2.54) case c16a1 case height: 0.39 (9.91) pin diameters: pins 1-7: 0.040 0.002 (1.016 0.051) case c16a2 case height: 0.39 (9.91) pin diameters: pins 1-2, 4: 0.040 0.002 (1.016 0.051) pins 3, 5-7: 0.062 0.002 (1.575 0.051) case c16c2 case height: 0.48 (12.19) pin diameters: pins 1-2, 4: 0.040 0.002 (1.016 0.051) pins 3, 5-7: 0.062 0.002 (1.575 0.051) case c16a1, a2,c2 preliminary part num er structure
unr models non-isolated, 12-33w, 5 & 12v-input dc/dc converters input input voltage range 3.0 to 3.6 volts (3.3v nominal) d5 models 4.75-5.5 volts (5v nominal) d12 models 10.8-13.6 volts (12v nominal) input current: normal operating conditions see ordering guide standby/off mode 3.6ma typical input ripple current: 1.8/2.5v models 150map-p 3.3/8 -d5 models 100map-p 3.3/10v -d5 models 150map-p 3.3/8 -d12 models 110map-p 3/3/10 -d12 models 250map-p input filter type capacitive overvoltage protection none reverse-polarity protection none on/off control: ? functionality ttl high (or open) = on, low = off logic threshold +0.8-2.0 volts (1.5v typical) output v out accuracy (50% load): 1.8v out models 2% of v out maximum 2.5/3.3v out models 1% of v out maximum v out trim range ? trim pin tied to +output: v out = 1.52 volts or less trim pin tied to output return v out = 3.6 volts or greater temperature coef cient 0.02% per c ripple/noise (20mhz bw) ? see ordering guide line/load regulation see ordering guide ef ciency see ordering guide overcurrent protection: ? technique "hiccup" with auto-recovery overcurrent detection point 110-180% of rated current average short circuit current: d5 models 1 amp typical, 3 amps maximum d12 models 4 amp typical, 6 amps maximum dynamic characteristics transient response (50-100% load): 1.8/2.5v out models 60sec to 2.5% of ? nal value 3.3v out -d5 models 50sec to 2.5% of ? nal value 3.3/8 -d12 models 50sec to 1% of ? nal value 3.3/10 -d12 models 50sec to 2.5% of ? nal value start-up time: ? v in to v out 25/30msec (1.8/2.5v out models) on/off to v out 25/30msec (1.8/2.5v out models) switching frequency 300khz (30khz) environmental operating temperature (ambient): ? without derating see derating curves with derating to +100c (see derating curves) storage temperature ?40 to +105c physical dimensions: d5 through-hole models 2" x 1" x 0.39" (51 x 25 x 9.9mm) d5 surface-mount models 2" x 1" x 0.43" (51 x 25 x 10.9mm) d12 through-hole models 2" x 1" x 0.48" (51 x 25 x 12.2mm) d12 surface-mount models 2" x 1" x tbd" (51 x 25 x 12.7mm) performance/functional speci cations typical @ t a = +25c under nominal line voltage and full-load conditions unless noted. ? ? all models are tested and speci? ed with an external 470f input capacitor with a 20m ? esr and a 6arms ripple-current rating, as well as a 22f output capacitor with a 200m ? esr. see i/o filtering and noise reduction for more details. these devices have no minimum-load requirements and will regulate under no-load conditions. listed speci? cations apply for both "t" and "sm" models as appropriate. ? see output overcurrent detection for details. ? see on/off control for details. ? see output voltage trimming for details. ? for all models, output noise can be further reduced with the installation of additional external output capacitors. see i/o filtering and noise reduction for details. ? see start-up time for details. ? see temperature derating for details. input voltage: continuous: d5 models 7 volts d12 models 15 volts transient (100msec) 15 volts input reverse-polarity protection none input/output overvoltage protection none output current current limited. devices can withstand a sustained output short circuit without damage. storage temperature ?40 to +105c lead temperature (soldering, 10 sec.) +300c 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 3 technical notes return current paths these are non-isolated dc/dc converters. the input return, output return and logic ground pins are all connected together internally. to the extent possible, all input and load currents should be returned through the input return and output return, respectively (via low-impedance runs). any con- trol signals applied to the on/off control pin should be referenced to logic ground. the internal trace leading to logic ground is not designed to carry high current. consequently, devices should never be installed in a manner that results in high current ? ow through logic ground (i.e., the input/output return pins should never be left open or connected via high-impedance paths). i/o filtering and noise reduction all models in the unr 12-33w series converters are tested and speci? ed with external 470f input capacitors (20m ? esr, 6arms ripple-current rating) and external 22f output capacitors (200m ? esr). in critical applica- tions, input/output ripple/noise may be further reduced by installing additional i/o caps. physical shielding 5 sided case connection input/output return case material corrosion-resistant steel with non-conductive, epoxy-based, black enamel ? nish and plastic baseplate pin material copper, tin plated
unr series non-isolated, 12-33w, 5 & 12v-input dc/dc converters external input capacitors serve primarily as energy-storage elements. they should be selected for bulk capacitance (at appropriate frequencies), low esr, and high rms-ripple-current ratings. input capacitors compensate for ir drops on input lines and power sources. providing a solid input voltage will greatly reduce the need for capacitors. the switching nature of modern dc/dc converters requires that dc input voltage sources have low ac imped- ance, as 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 published speci? cations by 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 unr 12-33w series converters are not internally fused. certain applications and or safety agencies may require the installation of fuses at the inputs of power conversion components. fuses should also be used if the possibility of sustained, non-current-limited, input-voltage polarity reversals exists. for datel unr 12-33w series dc/dc converters, you should use either slow- blow or normal-blow fuses with values no greater than the following. output voltage fuse value 1.8v models 9 amps 2.5v models 12 amps 3.3/8-d5 models 12.5 amps 3.3/10-d5 models 16 amps 3.3/8-d12 models 6 amps 3.3/10-d12 models 7 amps figure 2. driving the on/off control pin 4 input overvoltage and reverse-polarity protection unr 12-33w 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. +input logic ground on/off control r pull up d5 models 4.99k ? d12 models 12.4k ? dynamic control of the on/off function is best accomplished with a mechanical relay or open-collector/open-drain drive circuit (optically isolated if appropri- ate). 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 voltage is ramping up and then "released" once the input has stabilized. the time duration 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. 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 (4.75v for d5 models, 10.8v for d12 models) and the fully loaded output voltage enters and remains within it speci? ed accuracy band. actual measured times will vary with heavy capacitive loading. 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 output overvoltage protection unr 12-33w series dc/dc converters do not incorporate output overvolt- age protection. in the extremely rare situation in which the device?s feedback loop is broken, the output voltage may run to excessively high levels. 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 transformers, fet's and diodes are at the highest risk. unr 12-33w series dc/dc converters incorporate an output overcurrent detection and shutdown function that serves to protect both the power converter and its load. on/off control the on/off control pin may be used for remote on/off operation. unr 12-33w series dc/dc converters are designed so that they are enabled when the control pin is pulled high or left open (normal mode) and disabled when the control pin is pulled low (to less than +0.8v relative to logic ground). as shown in figure 2, d5 models have internal 4.99k ? pull-up resistors to v in (+input), while d12 models have 12.4k ? .
unr models non-isolated, 12-33w, 5 & 12v-input dc/dc converters output voltage trimming unr 12-33w devices can be trimmed to any voltage between 1.52v and 3.6v. trimming is accomplished with either a trimpot or a single ? xed resistor. the trimpot should be connected between +output and output return with its wiper connected to the trim pin as shown in figure 3 below. a trimpot can be used to determine the value of a single ? xed resistor which should be connected, as shown in figure 4, between the trim pin and +output to trim down the output voltage, or between the trim pin and output return to trim up the output voltage. fixed resistors should be metal-? lm types with 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 between 1% and 2% accurate, depending on model. see performance and functional speci? cations. 5 load 20k ? 5-10 tu r n s +input input return +output trim output return trim down trim up load +input input return +output trim output return figure 4. trim connections using fixed resistors note: install either a ? xed trim-up resistor or a ? xed trim-down resistor depending upon desired output voltage. when the output current of a thermally stabilized converter exceeds the maximum rating by 40% (typical) to 80% (maximum), the internal overcurrent detection circuit shuts down the converter by discharging the soft-start circuit of the pulse width modulator (pwm). in this off state, which is similar to that achieved by pulling the on/off control low, the output voltage quickly drops as the output capacitors discharge into the load. since there is no longer any output current, the overcurrent detection circuit is released, allowing the soft- start circuit to recharge and the converter to turn on again. if the faulty load condition persists, the overcurrent detection circuit will again discharge the soft-start circuit and shut down the converter. this continuous on/off cycling of the converter is referred to as ?hiccup mode.? once the overload condition is removed, the converter remains on, and the output voltage is quickly restored to its regulated value. the components used to sense the output current have large temperature coef? cients. consequently, in a "cold-start" situation, the overcurrent detec- tion point may temporarily move to 80% to 120% above the rated current speci? cation. the device quickly heats up, particularly if an overload situation exists, and restores the normal (40%) overcurrent detection point. the device will not be damaged by starting up into an output-short-circuit condition. the overcurrent detection circuitry helps keep internal current levels and operating temperatures within safe operating limits. nevertheless, sustained operation at current levels above the rated output current but below the over- current detection point may result in permanent damage to the converter. figure 3. trim connections using a trimpot unr-1.8/10-d5t unr-1.8/10-d5sm unr-2.5/10-d5t unr-2.5/10-d5sm ?1.74 up r t (k ? ) = v o ? 1.8 3.14 ?1.74 down r t (k ? ) = 2.5 ? v o 7.5(v o ? 1.26) ?1.74 up r t (k ? ) = v o ? 2.5 9.47 ?1.0 down r t (k ? ) = 3.3 ? v o 7.5(v o ? 1.27) unr-3.3/8-d5t unr-3.3/8-d5sm unr-3.3/10-d5t unr-3.3/10-d5sm unr-3.3/8-d12t unr-3.3/8-d12sm unr-3.3/10-d12t unr-3.3/10-d12sm ?1.0 up r t (k ? ) = v o ? 3.3 9.5 ?1.0 down r t (k ? ) = 3.3 ? v o 7.5(v o ? 1.26) ?1.0 up r t (k ? ) = v o ? 3.3 9.41 ?1.74 down r t (k ? ) = 1.8 ? v o 2.49(v o ? 1.26) note: resistor values are in k ? . accuracy of adjustment is subject to tolerances of resistors and factory-adjusted output accuracy. v o = desired output voltage.
unr series non-isolated, 12-33w, 5 & 12v-input dc/dc converters 6 recommended pc board layout if necessary, a single pc board layout can accommodate both through-hole and smt models of the unr 12-33w series. note that on page 2 of this data sheet, the through-hole package is drawn with a bottom view of its pin locations, and the surface-mount package is drawn with of top view of its pin locations. as shown below, the through-hole pin locations, when viewed from above, fall just inside (on 1.8 inch centers) the smt pin locations (which essentially begin on 2.1 inch centers). the table below shows how the pin functions align. 260 240 220 200 180 160 140 120 100 80 60 40 20 0 0 30 60 90 120 150 180 210 240 270 300 pre-heat and temperature soak solder reflow peak temp. 235 c time (seconds) temperature ( c) solder re ow for the surface-mount models ("sm" suf? x) of the unr 12-33w series, the packages' gull-wing leads are made of tin-plated (150 microinches) copper. the gull-wing con? guration, as opposed to "j" leads, was selected to keep the solder joints out from under the package to minimize both heat conduction away from the leads (into the encapsulated package) and ir shadowing effects. through a series of experiments, using 8 mil-thick, 63/37/2 (lead/tin/silver) solder paste and single-layer test boards, we have determined an optimal solder-re? ow temperature pro? le as shown in figure 6. optimal pro? le will be a function of many factors including paste thickness, board thickness, number of conductive layers, copper weight, the density of sur- rounding components, etc. the pro? le in figure 6 should be used as a starting point for your own experi- ments. if you'd like, datel can provide you with complimentary "dummy" units to be used in such tests. under no circumstances should the peak temperature exceed +235c for an extended period of time. as shown in figure 7, our tests have determined the optimal landing-pad size to be 160 mils by 130 mils. figure 6. optimal solder re ow pro le figure 7. pc board land pattern 0.130* (3.30) 0.015 (0.38) 0.100** (2.54) * pad dimension ** lead dimension 0.160* (4.06) 0.110** (2.79) 4 3 2 1 8 7 6 5 9 0.10 (2.54) 0.110 (2.79) 0.100 (2.54) 0.300 (7.62) 0.500 (12.70) top view 1.00 (25.40) 0.800 (20.32) 4 eq. sp. @ 0.200 (5.08) 0.10 (2.54) 1 2 3 4 6 7 5 1.800 (45.72) 0.10 (2.54) 0.300 (7.62) top view 1.00 (25.40) 0.800 (20.32) 4 eq. sp. @ 0.200 (5.08) pins 1-2, 4: 0.040 0.002 (1.016 0.051) pins 3, 5-7: 0.062 0.002 (1.575 0.051) case c16a2 case c18 +input +output on/off control trim power ground 4 no pin n.c. 3 no pin n.c. 2 2 on/off control 1 1 logic ground 9 7 +input 8 6 input return 7 5 output return 6 4 trim 5 3 +output smt through-hole pin number pin number pin function figure 5. recommended board layout currently a vailable for hand soldering only. contact datel. currently a vailable for hand soldering only. contact datel.
unr models non-isolated, 12-33w, 5 & 12v-input dc/dc converters typical performance curves 7 v in to v out start-up time on/off control to v out start-up time d5 models, start-up from v in (full load, using specified output capacitor.) v out 1v/div v in 2v/div 10msec/div d5 models, start-up from enable (full load, using specified output capacitor.) v out 1v/div enable 2v/div 10msec/div d12 models, start-up from v in (full load, using specified output capacitor.) v out 1v/div v in 5v/div 10msec/div d12 models, start-up from enable (full load, using specified output capacitor.) v out 1v/div enable 5v/div 10msec/div
unr series non-isolated, 12-33w, 5 & 12v-input dc/dc converters 8 temperature derating output power (watts) ambient temperature ( ? c) unr-1.8/10-d5t/d5sm output power vs. ambient temperature 20 18 16 14 12 10 8 6 4 2 0 ?40 0 40 45 50 55 60 65 70 75 80 85 90 95 100 output power (watts) ambient temperature ( ? c) unr-2.5/10-d5t/d5sm output power vs. ambient temperature, no air flow 27.5 25 22.5 20 17.5 15 12.5 10 7.5 5 2.5 0 ?40 0 40 45 50 55 60 65 70 75 80 85 90 95 100 output power (watts) ambient temperature ( ? c) unr-3.3/10-d12t/d12sm output power vs. ambient temperature, no air flow 35 30 25 20 15 10 5 0 ?40 0 40 45 50 55 60 65 70 75 80 85 90 95 100 output power (watts) ambient temperature ( ? c) unr-3.3/10-d5t/d5sm output power vs. ambient temperature, no air flow 35 30 25 20 15 10 5 0 ?40 0 40 45 50 55 60 65 70 75 80 85 90 95 100 output power (watts) ambient temperature ( ? c) unr-3.3/8-d12t/d12sm output power vs. ambient temperature, no air flow 30 25 20 15 10 5 0 ?40 0 40 45 50 55 60 65 70 75 80 85 90 95 100 output power (watts) ambient temperature ( ? c) unr-3.3/8-d5t/d5sm output power vs. ambient temperature, no air flow 30 27.5 25 22.5 20 17.5 15 12.5 10 7.5 5 2.5 0 ?40 0 40 45 50 55 60 65 70 75 80 85 90 95 100
unr models non-isolated, 12-33w, 5 & 12v-input dc/dc converters 9 94 90 86 82 78 74 70 66 62 unr-1.8/10-d5t/d5sm efficiency vs. line/load 12345678910 load current (amps) efficiency ( % ) v in = 4.75v v in = 5.5v v in = 5v 94 90 86 82 78 74 70 66 62 unr-2.5/10-d5t/d5sm efficiency vs. line/load 12345678910 load current (amps) efficiency ( % ) v in = 4.75v v in = 5v v in = 5.5v 94 92 90 88 86 84 82 80 78 unr-3.3/10-d5t/d5sm efficiency vs. line/load 12345678910 load current (amps) efficiency ( % ) v in = 4.75v v in = 5v v in = 5.5v 94 92 90 88 86 84 82 80 78 unr-3.3/8-d12t/d12sm efficiency vs. line/load 123 4 567 8 load current (amps) efficiency ( % ) v in = 10.4v v in = 12v v in = 13.6v 94 92 90 88 86 84 82 80 78 unr-3.3/8-d5t/d5sm efficiency vs. line/load 123 4 567 8 load current (amps) efficiency ( % ) v in = 4.75v v in = 5v v in = 5.5v efficiency vs. line/load
unr series non-isolated, 12-33w, 5 & 12v-input 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 imp ly the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to change without notice. the date l 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 ds-0504 9/01 innovation and excellence ? ? iso 9001 registered 8
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