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 18-33w 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 1.8, 2.5 and 3.3 volts and up to 10 amps of output current in through-hole 1" x 2" metal cases. with on/off control as a standard feature, these non-isolated converters exploit full synchronous recti cation, 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 +40/50/60? (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 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 cc non-isolated, 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 1.8/2.5/3.3v 8 and 10 amp output current models non-isolated, full synchronous topology 1" x 2" through-hole package high ef ciency to 91%; low noise 200khz switching frequency 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, 18-33w, 5 & 12v-input dc/dc converters performance speci cations and ordering guide ? output input part number structure non-isolated output con guration: u = unipolar nominal output voltage: 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 - 1.8 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-1.8/10-d5 1.8 10 70 100 0.1% 0.5% 5 4.75-5.5 150/4190 82% 86% c5a2, p9 unr-2.5/8-d5 2.5 8 40 80 0.1% 0.5% 5 4.75-5.5 100/4440 86% 90% c5a1, p9 unr-2.5/10-d5 2.5 10 40 80 0.1% 0.5% 5 4.75-5.5 150/5620 85% 89% c5a2, p9 unr-3.3/8-d5 3.3 8 40 80 0.1% 0.5% 5 4.75-5.5 100/5740 88% 92% c5a1, p9 unr-3.3/10-d5 3.3 10 40 80 0.1% 0.5% 5 4.75-5.5 100/7250 86% 91% c5a2, p9 unr-2.5/8-d12 2.5 8 40 80 0.1% 0.625% 12 10.8-13.6 100/1890 85% 88% c5a1, p9 unr-2.5/10-d12 2.5 10 40 80 0.1% 0.625% 12 10.8-13.6 100/2410 83% 86% c5c2, p9 unr-3.3/8-d12 3.3 8 60 120 0.1% 0.625% 12 10.8-13.6 50/2440 86% 91% c5a1, p9 unr-3.3/10-d12 3.3 10 60 120 0.1% 0.625% 12 10.8-13.6 50/3090 86% 89% c5c2, p9 ? 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. mechanical specifications i/o connections pin function p23 1 logic ground 2 on/off control 3 +output 4 output return 5 input return 6 +input 1 2 3 4 6 5 1.800 (45.72) 0.10 (2.54) 0.10 (2.54) 0.300 (7.62) 0.800 (20.32) bottom view 0.200 (5.08) 0.400 (10.16) 1.00 (25.40) metal case insulated base 2.00 (50.80) 0.20 min (5.08) * dimensions are in inches (mm) case c5a1 *case height: 0.39 (9.91) pin diameters: pins 1-7: 0.040 0.002 (1.016 0.051) case c5a2 *case height: 0.39 (9.91) pin diameters: pins 1-2: 0.040 0.002 (1.016 0.051) pins 3-6: 0.062 0.002 (1.575 0.051) case c5c2 *case height: 0.48 (12.19) pin diameters: pins 1-2: 0.040 0.002 (1.016 0.051) pins 3-6: 0.062 0.002 (1.575 0.051) case c5a1, a2, c2 output current (amps) ambient temperature (?c) 12 10 8 6 4 2 0 ?400 102030405060708090100 unr-2.5/10-d12 unr-3.3/10-d12 unr-3.3/10-d5 unr-2.5/10-d5 unr-2.5/8-d5 unr-1.8/8-d5 unr-2.5/8-d12 unr-3.3/8-d12 temperature derating
unr models non-isolated, 18-33w, 5 & 12v-input dc/dc converters input input voltage range d5 models 4.75-5.5 volts (5v nominal) d12 models 10.8-13.6 volts (12v nominal) input current ? see ordering guide input filter type capacitive overvoltage protection none reverse-polarity protection none on/off control: ? ? ttl high (or open) = on, low = off 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 ripple/noise (20mhz bw) ? see ordering guide line/load regulation see ordering guide ef ciency see ordering guide overcurrent protection: ? 8 amp -d5 models 9-15 amps (12 amps typical) 10 amp -d5 models 11-18 amps (15 amps typical) 8 amp -d12 models 9-15 amps (12 amps typical) 10 amp -d12 models 11-19 amps (14 amps typical) dynamic characteristics transient response (50-100% load): 1.8v out -d5 models 60sec to 2.5% v out 2.5-3.3v out -d5 models 50sec to 2.5% v out 2.5-3.3v out -d12 models 50sec to 1% v out switching frequency 200khz (20khz) environmental operating temperature (ambient): without derating see derating curves with derating to +100c (see derating curves) storage temperature ?40 to +105c physical dimensions: d5 models 2" x 1" x 0.39" (51 x 25 x 9.9mm) 2.5v -d12 models 2" x 1" x 0.48" (51 x 25 x 12.2mm) 3.3/8 -d12 models 2" x 1" x 0.39" (51 x 25 x 9.9mm) 3.3/10 -d12 models 2" x 1" x 0.48" (51 x 25 x 12.2mm) shielding 5 sided case connection pin 5 (input return) case material corrosion-resistant steel with non-conductive, epoxy-based, black enamel ? nish and plastic baseplate pin material brass, solder coated weight c5a1, c5a2 cases 1.4 ounces (39.7 grams) c5c2 case 1.76 ounces (49.4 grams) 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 rated for 6arms ripple current and an external 22f output capacitor with an esr lower than 200m ? . these devices have no minimum-load requirements and will regulate under no-load conditions. ? no-load/full-load conditions. when the unit is off, the input "standby" current is typically 10ma. ? applying an external voltage to the on/off control pin when no input voltage is applied can cause permanent damage to the converter. ? see on/off control functionality. ? output noise may be further reduced with additional external capacitors across the output terminals. caps should have low esr (typically 60m ? ) and be located as close to the unit as possible. ? current limiting initiates at approximately 30% above rated load. under short-circuit conditions, output current folds back to approximately 1a and remains there until the short is removed. input voltage: continuous: d5 models 7 volts d12 models 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 18-33w 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. 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.
unr series non-isolated, 18-33w, 5 & 12v-input dc/dc converters 4 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 inter- nal ? ltering to meet your speci? c requirements. contact our applications engineering group for additional details. input overvoltage and reverse-polarity protection unr 18-33w 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. on/off control functionality the on/off control pin has an internal 5k ? pull-up resistor to +v in . it can be driven with any logic circuit capable of meeting the following requirements: logic "0" = 0 to +0.8v; logic "1" = +2.0v to +v in ; i h (@v in = +2.0v) = ?0.7ma; i il (@v in = 0v) = ?1.1ma. open collector logic or a single npn drive transistor can be used. the drive circuit should be rated for more than 5.5v. applying a voltage to pin 2 when no input power is applied to the converter can cause permanent damage to the converter. 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 ex c ell e n c e ? ? iso 9001 registered
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