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single output uhe models features isolated, high ef?ciency, 1.6" x 2" 2-10 amp, 12-30 watt dc/dc's figure 1. simpli?ed schematic 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 C o u t p u t C s e n s e + i n p u t ( 4 ) ( 6 ) ( 1 ) ( 2 ) ( 5 ) ( 7 ) ( 8 ) ( 9 ) C i n p u t p w m c o n t r o l l e r r e f e r e n c e & e r r o r a m p t h e r m a l s h u t d o w n o p t o i s o l a t i o n o p t o i s o l a t i o n u v l o & o v l o c o m p a r a t o r s o v e r v o l t a g e c o m p a r a t o r o n / o f f c o n t r o l v o u t t r i m + o u t p u t + s e n s e s w i t c h c o n t r o l ? optional comparator feedback. contact datel. ? sense pins are optional on 1.2-5v out models ("r" suf?x). ? ?? ? ? housed in smaller, 1.6" x 2" x 0.40" (41 x 51 x 10.2mm) packages carrying the standard 2" x 2" pinout, datel's new uhe series dc/dc converters deliver more current/power (up to 10a/30w) than currently available from either package size. the uhe 12-30w series of high-ef?ciency, isolated dc/dc's provide output power ranging from 10 amps @ 1.2v to 2 amps @ 15v. offering both 2:1 and 4:1 input voltage ranges, uhe's meet v in requirements from 9 to 75 volts. taking full advantage of the synchronous-recti?er, forward topology, uhe's boast outstanding ef?ciency (some models exceed 91%) enabling full-power operation to ambient temperatures as high as +60c, without air ?ow. assembled using fully automated, smt-on-pcb techniques, uhe's provide stable no-load operation, excel - lent line (0.1%) and load (0.15%) regulation, quick step response (200sec), and low output ripple/noise (50-100mvp-p). additionally, the uhe's unique output design eliminates one of the topology's few shortcomingsCoutput reverse conduction. all devices feature full i/o fault protection including: input overvoltage and under - voltage shutdown, precise output overvoltage protection (a rarity on low-voltage outputs), output current limiting, short-circuit protection, and thermal shutdown. all uhe models incorporate a v out trim function and an on/off control pin (positive or negative polarity). low-voltage models (1.2v to 5v) offer optional sense pins facilitating either remote load regulation or current sharing for true n+1 redun - dancy. all models are certi?ed to the basic insulation requirements of ul/en60950, and 48v in (75v max.) models carry the ce mark. ? the most i out /p out in this format ? lower priced than bricks ? small 1.6" x 2" x 0.4" plastic package with standard 2" x 2" pinout ? output con?gurations: 1.2/1.5/1.8/2.5v out @ 10 amps 3.3/5v out @ 25 watts 5/12/15v out @ 30 watts ? five input ranges from 9-75 volts ? ef?ciencies as high as 91.5% ? stable no-load operation ? optional sense pins for low v out ? thermal shutdown, i/o protected ? 1500 vdc i/o basic insulation ? ul/en60950 certi?ed; ce marked for q48 models new wide-input-range "q" models ? ? a subsidia ry of c&d technologie s
xhe series 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 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/a) min. typ. pinout) 2 performance speci?cations and ordering guide ? typical at t a = +25c under nominal line voltage and full-load conditions, unless noted. ? ripple/noise (r/n) is tested/speci?ed over a 20mhz bandwidth. all models are speci?ed with an external 0.47f multi-layer ceramic capacitor installed across their output pins. ? devices have no minimum-load requirements and will regulate under no-load conditions. regulation speci?cations describe the output voltage deviation as the line voltage or load (with/without sense option) is varied from its nominal/midpoint value to either extreme. ? nominal line voltage, no-load/full-load conditions. ? output input m e c h a n i c a l s p e c i f i c a t i o n s 6 plastic case 0.040 0.001 dia. (1.016 0.025) 0.20 min (5.08) 2.00 (50.80) 0.40 (10.16) st andoff 0.020 (0.51) 1.800 (45.72) 0.10 (2.54) 0.200 (5.08) 0.200 (5.08) 0.20 (5.08) 0.400 (10.16) 0.100 (2.54) 1.60 (40.64) bo tt om view dimensions are in inches (mm) 9 5 8 7 1 2 4 3 0.400 (10.16) 2 eq. sp . @ 0.200 (5.08) case c32 0.400 (10.16) * pins 5 and 8 are installed for optional r-suf?x versions of 1.2-5 v out models. pin function p51 function p52 1 +input +input 2 Cinput Cinput 3 no pin no pin 4 on/off control on/off control 5 no pin +sense* 6 +output + output 7 Coutput Coutput 8 no pin Csense* 9 trim trim i/o connections see page 13 for complete part number structure & ordering details. high ef?ciency unipolar nominal output voltage maximum rated output in ma input voltage range u he 7500 - / d48 - 3.3 n optional functions r lx uhe-1.2/10000-d12 1.2 10 80 120 0.1% 0.15/0.625% 12 9-18 35/1.27 80% 82% c32, p51/52 uhe-1.2/10000-d24 1.2 10 80 120 0.1% 0.15/0.625% 24 18-36 35/0.63 81% 83% c32, p51/52 uhe-1.2/10000-d48 1.2 10 80 120 0.1% 0.15/0.625% 48 36-75 35/0.31 81% 83% c32, p51/52 uhe-1.5/10000-d12 1.5 10 55 80 0.1% 0.15/0.625% 12 9-18 35/1.56 81% 83% c32, p51/52 uhe-1.5/10000-d24 1.5 10 55 80 0.1% 0.15/0.625% 24 18-36 35/0.76 84% 86% c32, p51/52 uhe-1.5/10000-d48 1.5 10 55 80 0.1% 0.15/0.625% 48 36-75 35/0.38 82% 84% c32, p51/52 uhe-1.8/10000-d12 1.8 10 55 80 0.1% 0.15/0.625% 12 9-18 35/1.81 84% 85.5% c32, p51/52 uhe-1.8/10000-d24 1.8 10 55 80 0.1% 0.15/0.625% 24 18-36 35/0.89 85.5% 87% c32, p51/52 uhe-1.8/10000-d48 1.8 10 50 75 0.1% 0.15/0.625% 48 36-75 35/0.46 83.5% 85% c32, p51/52 uhe-2.5/10000-d12 2.5 10 50 75 0.1% 0.15/0.5% 12 9-18 35/2.48 85% 87% c32, p51/52 uhe-2.5/10000-d24 2.5 10 50 75 0.1% 0.15/0.5% 24 18-36 35/1.23 86% 88% c32, p51/52 uhe-2.5/10000-d48 2.5 10 50 75 0.1% 0.15/0.5% 48 36-75 35/0.61 86% 88% c32, p51/52 uhe-3.3/7500-q12 3.3 7.5 50 70 0.1% 0.15/0.3% 24 9-36 50/1.2 86.5% 88% c32, p51/52 uhe-3.3/7500-q48 3.3 7.5 60 90 0.1% 0.15/0.3% 48 18-75 38/0.6 87.5% 89.5% c32, p51/52 uhe-3.3/7500-d48 3.3 7.5 60 90 0.1% 0.15/0.3% 48 36-75 35/0.6 88.5% 91% c32, p51/52 uhe-3.3/7500-d48t 3.3 7.5 80 100 0.1% 0.25% 48 36-75 35/0.58 87% 88.5% c32, p51 uhe-5/5000-q12 5 5 50 70 0.1% 0.15/0.3% 24 9-36 50/1.22 86% 87.5% c32, p51/52 uhe-5/5000-q48 5 5 60 90 0.05% 0.15/0.3% 48 18-75 35/0.6 87.5% 90% c32, p51/52 uhe-5/6000-d48 5 6 80 100 0.1% 0.25/0.5% 48 36-75 45/0.73 87.5% 89% c32, p51/52 uhe-5/6000-d48t 5 6 80 100 0.1% 0.25% 48 36-75 45/0.7 87.5% 89% c32, p51 uhe-5/6000- q48t 5 6 90 125 0.1% 0.45% 48 18-75 38/0.71 86% 87.5% c32, p51 uhe-12/2500-q12 12 2.5 100 120 0.1% 0.3% 24 9-36 145/1.5 85% 87.5% c32, p51 uhe-12/2500-d12 12 2.5 65 100 0.1% 0.3% 12 9-18 90/2.92 87% 89% c32, p51 uhe-12/2500-d24 12 2.5 65 100 0.1% 0.3% 24 18-36 55/1.44 88% 90% c32, p51 uhe-12/2500-q48 12 2.5 100 120 0.1% 0.3% 48 18-75 45/0.72 88% 90.5% c32, p51 uhe-12/2500-d48 12 2.5 60 100 0.1% 0.3% 48 36-75 30/0.7 90% 92% c32, p51 uhe-15/2000-d12 15 2 70 100 0.1% 0.3% 12 9-18 110/2.92 87% 89% c32, p51 uhe-15/2000-q12 15 2 70 100 0.1% 0.5% 24 9-36 50/1.42 86% 88% c32, p51 uhe-15/2000-d24 15 2 70 100 0.1% 0.3% 24 18-36 70/1.44 88% 90% c32, p51 uhe-15/2000-q48 15 2 100 150 0.1% 0.3% 48 18-75 45/0.72 88% 90.5% c32, p51 uhe-15/2000-d48 15 2 70 100 0.1% 0.3% 48 36-75 35/0.7 90% 92% c32, p51 t alternate trim con?guration
uhe models 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 3 performance/functional speci?cations typical @ t a = +25c under nominal line voltage and full-load conditions, unless noted. (1) (2) input input voltage range: d12 models (start up at 10v max.) 9-18 volts (12v nominal) q12 models (start up at 10v max.) 9-36 volts (24v nominal) d24 models 18-36 volts (24v nominal) q48 models 18-75 volts (48v nominal) d48 models 36-75 volts (48v nominal) overvoltage shutdown: d12 models 18.5-23 volts (20v typical) q12/d24 models 37-42 volts (39.5v typical) d48/q48 models na start-up threshold: (2) d12/q12 models 9.4-10 volts (9.6v typical) d24/q48 models 15.5-18 volts (17v typical) d48 models 33.5-36 volts (35v typical) undervoltage shutdown: (2) d12/q12 models 7.0-8.8 volts (8v typical) d24/q48 models 15-17 volts (16.5v typical) d48 models 32-35.5 volts (34.5v typical) input current: normal operating conditions see ordering guide standby mode (off, ov, uv) 5ma input re?ected ripple current (3) 10map-p input filter type lc reverse-polarity protection brief duration, 5a maximum remote on/off control (pin 4): (4) positive logic (standard) on = open, open collector, or +3.5v-v in applied. i in = 2.6ma max. off = pulled low to 0-0.8v. i in = 2ma max. negative logic ("n" suf?x models) on = pulled low to 0-0.8v. i in = 6ma max. off = open, open collector or +3.5v to v in applied. i in = 1ma max. output v out accuracy (50% load): initial 1.5% maximum temperatue coef?cient 0.02% per c extreme (5) 3% minimum loading for speci?cation: (2) no load ripple/noise (20mhz bw) (1) see ordering guide line/load regulation see ordering guide ef?ciency see ordering guide v out trim range (6) 5% minimum (10% for t models) remote sense compensation (2) 5% isolation voltage: input-to-output 1500vdc minimum (basic) isolation capacitance 650pf isolation resistance 100m ? current limit inception (@98%v out ) : (7) 10 amp models 12-15 amps 7.5 amp models 8.2-11.5 amps 5/6 amp models 6.5-8.5 amps 2.5 amp models 2.6-3.75 amps 2.0 amp models 2.1-3 amps short circuit current (hiccup) 1.5-2.3 amps output overvoltage protection: magnetic feedback 1.2v outputs 1.5-2.1 volts 1.5v outputs 1.8-2.4 volts 1.8v outputs 2.2-2.8 volts 2.5v outputs 2.8 to 3.2 volts 3.3v outputs 4 to 4.8 volts 5v outputs 6.1-7.5 volts 12v outputs 12.7-13.5 volts 15v outputs 15.8-16.2 volts maximum capacitive loading: 10,000 f (1.2-5 v out ) (low esr capacitor) 2,000f (12-15 v out ) dynamic characteristics dynamic load response: (50-100% load step to 3% v out ) 200sec maximum (8) start-up time: (8) 4-8msec typical v in to v out and on/off to v out 15msec maximum switching frequency 150-350khz (model dependent) environmental mtbf (9) 2.15 million hours operating temperature (ambient) : (10) without derating +55 to +65c (model dependent) with derating to +100c (see derating curves) thermal shutdown 105 to +125c storage temperature C50 to +125c physical dimensions 1.6" x 2" x 0.40" (40.64 x 50.8 x 10.16mm) case material diallyl phthalate pin material brass, solder coated weight: 1.51 ounces (46.9 grams) primary to secondary insulation level basic (1) all models are tested and speci?ed with a single, external, 0.47 f, multi-layer ceramic output capacitor and no external input capacitors, unless otherwise noted. all models will effectively regulate under no-load conditions (with perhaps a slight increase in output ripple/noise). (2) see technical notes/performance curves for additional explanations and details. (3) input ripple current is tested/speci?ed over a 5-20mhz bandwidth with an external 33f input capacitor and a simulated source impedance of 220f and 12h. see i/o filtering, input ripple current and output noise for details. (4) the on/off control is designed to be driven with open-collector (or equivalent) logic or the application of appropriate voltages (referenced to Cinput (pin 2)). applying a voltage to the on/off control pin when no input voltage is applied to the converter can cause permanent damage. see remote on/off control for more details. (5) extreme accuracy refers to the accuracy of either trimmed or untrimmed output voltages over all normal operating ranges and combinations of input voltage, output load and temperature. (6) tie the output trim pin (pin 9) to +output (pin 6) for maximum trim down or to Coutput (output return/common, pin 7) for maximum trim up. see output trimming for detailed trim equations. (7) the current-limit-inception point is the output current level at which the converter's power- limiting circuitry drops the output voltage 2% from its initial value. see output current limiting and short-circuit protection for more details. (8) for start-up-time speci?cations, output settling time is de?ned as the output voltage having reached 1% of its ?nal value at maximum load current. (9) mtbfs are calculated using telcordia sr-332 method 1 case, ground ?xed, +25c ambient air and full-load conditions. contact datel for demonstrated life-test data. (10) all models are fully operational and meet all published speci?cations, including "cold start," at C40c.
xhe series 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s t e c h n i c a l n o t e s i nput voltage: continuous: d12 models 23 volts d24/q12 models 42 volts d48/q48 models 81 volts transient (100msec): d12 models 25? volts d24/q12 models 50 volts d48/q48 models 100 volts on/off control (pin 4) max. voltages referenced to Cinput (pin 2) no suf?x +v in "n" suf?x +7 volts input reverse-polarity protection current must be <5 amps. brief duration only. fusing recommended. output current current limited. devices can withstand sustained output short circuits without damage. case temperature +100c storage temperature C50 to +125c 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 4 input fusing 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-v oltage polarity reversals exists. for datel uhe 12-30 watt dc/dc converters, you should use slow-blow type fuses, installed in the ungrounded input supply line, with values no greater than the following. model fuse values in amps output/input d12 q12 d24 q48 d48 1.2 v out 3 -- 2 -- 1 1.5 v out 4 -- 2 -- 1 1.8 v out 5 -- 2.5 -- 1 2.5 v out 5 -- 2.5 -- 1 3.3 v out -- 7.5 - 3 1.5 5 v out -- 6 - 3 2 12 v out 6 -- 3 5 2 15 v out 6 -- 3 5 2 all relevant national and international safety standards and regulations must be observed by the installer. for system safety agency approvals, the converters must be installed in compliance with the requirements of the end- use safety standard, e.g. iec/en/ul60950. input undervoltage shutdown and start-up threshold under normal start-up conditions, devices will not begin to regulate until the ramping-up input voltage exceeds the start-up threshold voltage (35v for "d48" models). once operating, devices will not turn off until the input voltage drops below the undervoltage shutdown limit (34v for "d48" models). subsequent re-start will not occur until the input is brought back up to the start-up threshold. this built in hysteresis prevents any unstable on/off situations from occurring at a single input voltage. all d12/q12 models will start-up at 9.6v typically and will then work within speci?cations from 9-18v or 9-36v respectively. start-up time the v in to v out start-up time is the interval of time between the point at which the ramping input voltage crosses the start-up threshold 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/output capacitance, and load. the uhe series implements a soft start circuit that limits the duty cycle of its pwm controller at power up, thereby limiting the input inrush current. the on/off control to v out start-up time assumes the converter has its nominal input voltage applied but is turned off via the on/off control pin. the speci?cation de?nes the interval between the point at which the converter is turned on and the fully loaded output voltage enters and remains within its speci?ed accuracy band. similar to the v in to v out start-up, the on/off control to v out start-up time is also governed by the internal soft start circuitry and external load capacitance. the difference in start up time from v in to v out and from on/off control to v out is therefore insigni?cant. input overvoltage shutdown all d12/q12 and d24 models of the uhe dc/dc converters are equipped with input overvoltage protection. input voltages exceeding the input over - voltage shutdown speci?cation listed in the performance/functional speci? - cations will cause the device to shutdown. a built-in hysteresis for all models will not allow the converter to restart until the input voltage is suf?ciently reduced. all 48v in models have this overvoltage shutdown function disabled because of requirements for withstanding brief input surges to 100v for up to 100msec without output voltage interruption. please contact datel to have input overvoltage shutdown for d48/q48 models enabled. input source impedance uhe converters must be driven from a low ac-impedance input source. the dc/dc's performance and stability can be compromised by the use of highly inductive source impedances. the input circuit shown in figure 2 is a practical solution that can be used to minimize the effects of inductance in the input traces. for optimum performance, components should be mounted close to the dc/dc converter. if the application has a high source imped - ance, low v in models can bene?t of increased external input capacitance.
uhe models 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 5 figure 3. measuring output ripple/noise (pard) figure 2. measuring input ripple current c in v in c bu s l bu s c in = 33f , esr < 700m ? @ 100khz c bu s = 220f , esr < 100m ? @ 100khz l bu s = 12h +input Cinput current pr obe to oscilloscope + C c1 c1 = 0.47f cerami c c2 = na lo ad 2-3 inches (51-76mm) fr om module c2 r lo ad copper stri p copper stri p scope +output Coutput +sense Csense in critical applications, output ripple/noise (also referred to as periodic and random deviations or pard) may be reduced below speci?ed limits using ?ltering techniques, the simplest of which is the installation of additional external output capacitors. these output caps function as true ?lter elements and should be selected for bulk capacitance, low esr and appropriate frequency response. all external capacitors should have appropriate voltage ratings and be located as close to the converter as possible. temperature variations for all relevant parameters should also be taken carefully into consideration. the most effective combination of external i/o capacitors will be a function of line voltage and source impedance, as well as 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 engineering group for additional details. in figure 3, the two copper strips simulate real-world pcb impedances between the power supply and its load. in order to minimize measurement errors, scope measurements should be made using bnc connectors, or the probe ground should be less than ? inch and soldered directly to the ?xture. floating outputs since these are isolated dc/dc converters, their outputs are "?oating" with respect to their input. designers will normally use the Coutput (pin 7) as the ground/return of the load circuit. you can, however, use the +output (pin 6) as ground/return to effectively reverse the output polarity. minimum output loading requirements uhe converters employ a synchronous-recti?er design topology and all models regulate within spec and are stable under no-load to full load condi - tions. operation under no-load conditions however might slightly increase the output ripple and noise. thermal shutdown these uhe converters are equipped with thermal-shutdown circuitry. if envi - ronmental conditions cause the internal temperature of the dc/dc converter to rise above the designed operating temperature, a precision temperature sensor will power down the unit. when the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. see performance/functional speci?cations. output overvoltage protection uhe output voltages are monitored for an overvoltage condition via magnetic feedback. the signal is coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry will power down the pwm controller causing the output voltages to decrease. following a time-out period the pwm will restart, causing the output voltages to ramp to their appropriate values. if the fault condition persists, and the output voltages again climb to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. this on/off cycling is referred to as "hiccup" mode. contact datel for an optional output overvoltage monitor circuit using a comparator which is optically coupled to the primary side thus allowing tighter and more precise control. current limiting as soon as the output current increases to 10% to 50% above its rated value, the dc/dc converter will go into a current-limiting mode. in this condition, the output voltage will decrease proportionately with increases in output current, thereby maintaining somewhat constant power dissipation. this is commonly referred to as power limiting. current limit inception is de?ned as the point at which the full-power output voltage falls below the speci?ed tolerance. see performance/functional speci?cations. if the load current, being drawn from the converter, is signi?cant enough, the unit will go into a short circuit condition as speci?ed under "performance." i/o filtering, input ripple current, and output noise all models in the uhe 12-30 watt dc/dc converters are tested/speci?ed for input re?ected ripple current and output noise using the speci?ed external input/output components/circuits and layout as shown in the following two ?gures. external input capacitors (c in in figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient ir drops in conductors from backplane to the dc/dc. input caps should be selected for bulk capacitance (at appropriate frequencies), low esr, and high rms- ripple-current ratings. the switching nature of dc/dc converters requires that dc voltage sources have low ac impedance as highly inductive source impedance can affect system stability. in figure 2, c bus and l bus simulate a typical dc voltage bus. your speci?c system con?guration may necessitate additional considerations.
xhe series 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s lo ad +output Cinput +input on/off contr ol trim +sense Coutput Csense 7 8 2 1 9 6 5 4 20k ? 5-22 turns lo ad r1 +output Cinput +input on/off contr ol trim +sense Coutput Csense 7 8 2 1 9 6 5 4 figure 6. trim connections using a trimpot figure 7. trim connections to decrease output voltages using a fixed resistor (for all models except 1.2v models which will increase v out ) 6 short circuit condition when a converter is in current-limit mode, the output voltage will drop as the output current demand increases. if the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following a time-out period, the pwm will restart causing the output voltages to begin ramping to their appropriate values. if the short-circuit condition persists, another shutdown cycle will be initiated. this on/off cycling is referred to as "hiccup" mode. the hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. the uhe is capable of enduring an inde?nite short circuit output condition. features and options on/off control the input-side, remote on/off control function (pin 4) can be ordered to operate with either polarity: standard models are equipped with positive-polarity (no part-number suf?x) and these devices are enabled when pin 4 is left open (or is pulled high, applying +13v to +v in with respect to Cinput, pin 2) as per figure 4. positive- polarity devices are disabled when pin 4 is pulled low (0 to 0.8v with respect to Cinput). optional negative-polarity devices ("n" suf?x) are off when pin 4 is left open (or pulled high, applying +3.5v to +v in ), and on when pin 4 is pulled low (0 to 0.8v) with respect to Cv in as shown in figure 5. 4 2 1 +i np ut 13v circuit 5v circuit Ci nput on /o ff cont ro l 4 2 1 +i np ut +v cc Ci nput on /o ff cont ro l figure 4. driving the positive polarity on/off control pin figure 5. driving the negative polarity on/off control pin dynamic control of the remote on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically iso - lated if appropriate). the drive circuit should be able to sink appropriate current (see performance specs) when activated and withstand appropriate voltage when deactivated. applying an external voltage to pin 4 when no input power is applied to the converter can cause permanent damage to the converter. trimming output voltage uhe converters have a trim capability (pin 9) that allows users to adjust the output voltages 5% of v out (10% for t models). adjustments to the output voltages can be accomplished via a trim pot (figure 6) or a single ?xed resistor as shown in figures 7 and 8. a single ?xed resistor can increase or decrease the output voltage depending on its connection. the resistor should be located close to the converter and have a tcr less than 100ppm/c to minimize sensitivity to changes in temperature. if the trim function is not used, leave the trim pin ?oating. a single resistor connected from the trim (pin 9) to the +output (pin 6), or +sense where applicable, will decrease the output voltage for all models with the exception of the 1.2v models, which will increase the output voltage in this con?guration. a resistor connected from the trim (pin 9) to the Coutput (pin 7), or Csense where applicable, will increase the output voltage for all models with the exception of the 1.2v models, which will decrease the output voltage in this con?guration. trim adjustments greater than the speci?ed 5% can have an adverse affect on the converter's performance and are not recommended. excessive voltage differences between v out and sense, in conjunction with trim adjustment of the output voltage, can cause the overvoltage protection circuitry to activate (see performance speci?cations for overvoltage limits). 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 voltages to increase, thereby increasing output power beyond the converter's speci?ed rating or cause output voltages to climb into the output overvoltage region. therefore: (v out at pins) x (i out ) <= rated output power
uhe models 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s remote sense (optional on 1.2-5v out models) note: the sense and v out lines are internally connected through 10 ? resistors. nevertheless, if the sense function is not used for remote regulation the user should connect the +sense to +v out and Csense to Cv out at the dc/dc converter pins. uhe series converters have a sense feature to provide point of use regula - tion, thereby overcoming moderate ir drops in pcb conductors or cabling. the remote sense lines carry very little current and therefore require minimal cross- sectional-area conductors. the sense lines are used by the feedback control- loop to regulate the output. as such, they are not low impedance points and must be treated with care in layouts and cabling. sense lines on a pcb should be run adjacent to dc signals, preferably ground. in cables and discrete wiring applications, twisted pair or other techniques should be implemented. uhe series converters will compensate for drops between the output voltage at the dc/dc and the sense voltage at the dc/dc provided that: [v out (+) Cv out (C)] C[sense(+) Csense (C)] 5% v out output overvoltage protection is monitored at the output voltage pin, not the sense pin. therefore, excessive voltage differences between v out and sense in conjunction with trim adjustment of the output voltage can cause lo ad r2 +output Cinput +input on/off contr ol trim +sense Coutput Csense 7 8 2 1 9 6 5 4 lo ad +output Cinput sense current contact and pcb resistance losses due to ir drops contact and pcb resistance losses due to ir drops sense retur n +input on/off contr ol trim +sense Coutput Csense 7 8 2 1 9 5 i out retur n i out 6 4 figure 9. remote sense circuit con?guration figure 8. trim connections to increase output voltages (for all models except 1.2v models which will decrease v out ) 7 the overvoltage protection circuitry to activate (see performance speci?ca - tions for overvoltage limits). power derating is based on maximum output current and voltage at the converters output pins. use of trim and sense functions can cause output voltages to increase thereby increasing output power beyond the uhes speci?ed rating or cause output voltages to climb into the output overvoltage region. therefore, the designer must ensure: (v out at pins) x (i out ) rated output power C 3.169 0.3232 uhe-1.5/10000-d12, -d24, -d48 uhe-1.8/10000-d12, -d24, -d48 uhe-2.5/10000-d12, -d24, -d48 uhe-3.3/7500-q12, -q24, -d48 v o C 1.5 r2 (k ? ) = r1 (k ? ) = C 3.169 0.459(v o C 0.7096) 1.5 C v o 1.2 C v o C 7.596 0.9647 v o C 1.8 r2 (k ? ) = r1 (k ? ) = C 7.596 1.027(v o C 0.9352) 1.8 C v o C 7.503 2.142 v o C 2.5 r2 (k ? ) = r1 (k ? ) = C 7.503 2.226(v o C 0.9625) 2.5 C v o uhe-12/2500-d12, -d24, -d48 C 34.8 29.5 v o C 12 r2 (k ? ) = r1 (k ? ) = C 34.8 10(v o C 2.5) 12 C v o uhe-15/2000-d12, -d24, -d48 C 43.3 37.875 v o C 15 r2 (k ? ) = r1 (k ? ) = C 43.3 13.3(v o C 2.5) 15 C v o C 22.42 5.65 v o C 3.3 r2 (k ? ) = r1 (k ? ) = C 22.42 3.21(v o C 1.759) 3.3 C v o uhe-5/5000-q12, -q48, uhe-5/6000-d48 C 15.52 5.58 v o C 5 r2 (k ? ) = r1 (k ? ) = C 15.52 2.15(v o C 2.592) 5 C v o v o C 1.2 r1 (k ? ) = r2 (k ? ) = C 1.413 1.308(v o C 0.793) C 1.413 1.037 uhe-1.2/10000-d12, -d24, -d48 t rim up t rim up t rim do wn t rim do wn trim equations ?????????????????? ??????????????????????? ?? ? ?? ????????? ? ? ???? ???? ? ? ???????????????????? ? ? ? ? ??? ?? ? ?? ???????? ? ? ??????????????? ? ? ? ? ???? ? ? ??? ?? ? ?? ????????? ? ????????????????????????? ? ? ? ? ? ?? ? ?? ????????? ? ?????????????? ? ? ? ? ?? ? ? ? note : resistor values are in k ? . adjustment accuracy is subject to resistor tolerances and factory-adjusted output accuracy. v o = desired output voltage.
xhe series 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 8 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 . 8 / 1 0 0 0 0 - d 2 4 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 1 2 3 4 5 6 7 8 9 1 0 v i n = 3 6 v v i n = 1 8 v v i n = 2 4 v 9 0 8 5 8 0 7 5 7 0 6 5 6 0 5 5 u h e - 1 . 8 / 1 0 0 0 0 - d 4 8 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 1 2 3 4 5 6 7 8 9 1 0 v i n = 7 5 v v i n = 3 6 v v i n = 4 8 v 8 5 8 0 7 5 7 0 6 5 6 0 5 5 u h e - 1 . 5 / 1 0 0 0 0 - d 4 8 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 1 2 3 4 5 6 7 8 9 1 0 v i n = 7 5 v v i n = 3 6 v v i n = 4 8 v 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 . 5 / 1 0 0 0 0 - d 2 4 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 1 2 3 4 5 6 7 8 9 1 0 v i n = 3 6 v v i n = 1 8 v v i n = 2 4 v
uhe models 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 100 90 80 70 60 50 40 uhe-3.3/7500-d48 efficiency vs. load @ +25 ? c ambient output current (amps) efficiency ( % ) 0.75 1.5 2.25 3 3.75 4.5 5.25 6 6.75 7.5 v in = 75v v in = 36v v in = 48v ??? ?? ?? ?? ?? ?? ?? ?????????????????????????????????????????? ? ????????? ???????? ???? ????? ?? ????? ???? ????? ?? ????? ??? ????????????????????? ???????????? ? ? ? ??? ????? ? ??? ????? ? ??? ????? ? ??? ????? 100 90 80 70 60 50 40 uhe-5/6000-d48 efficiency vs. load @ +2 5 ? c ambient 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6 output current (amps) efficiency ( % ) v in = 75v v in = 36v v in = 48v 100 90 80 70 60 50 40 uhe-5/5000-q48 efficiency vs. load @ +2 5 ? c ambient 0. 5 1 1.5 2 2. 5 3 3.5 4 4.5 5 output current (amps) efficiency ( % ) v in = 75v v in = 36v v in = 48v v in = 18v 9 t y p i c a l p e r f o r m a n c e c u r v e s 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 5 / 5 0 0 0 - q 1 2 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 5 1 . 0 1 . 5 2 2 . 5 3 3 . 5 4 4 . 5 5 v i n = 3 6 v v i n = 9 v v i n = 2 4 v 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 3 . 3 / 7 5 0 0 - q 1 2 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 7 5 1 . 5 2 . 2 5 3 3 . 7 5 4 . 5 5 . 2 5 6 6 . 7 5 7 . 5 v i n = 3 6 v v i n = 9 v v i n = 2 4 v
xhe series 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 10 t y p i c a l p e r f o r m a n c e c u r v e s 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 2 / 2 5 0 0 - d 4 8 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 5 0 . 5 0 . 7 5 1 1 . 2 5 1 . 5 1 . 7 5 2 2 . 2 5 2 . 5 v i n = 7 5 v v i n = 3 6 v v i n = 4 8 v 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 5 / 2 0 0 0 - d 2 4 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 0 . 4 0 . 6 0 . 8 1 1 . 2 1 . 4 1 . 6 1 . 8 2 v i n = 3 6 v v i n = 1 8 v v i n = 2 4 v 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 5 / 2 0 0 0 - d 1 2 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 0 . 4 0 . 6 0 . 8 1 1 . 2 1 . 4 1 . 6 1 . 8 2 v i n = 1 8 v v i n = 9 v v i n = 1 2 v 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 5 / 2 0 0 0 - d 4 8 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 0 . 4 0 . 6 0 . 8 1 1 . 2 1 . 4 1 . 6 1 . 8 2 v i n = 7 5 v v i n = 3 6 v v i n = 4 8 v 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 2 / 2 5 0 0 - d 2 4 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 5 0 . 5 0 . 7 5 1 1 . 2 5 1 . 5 1 . 7 5 2 2 . 2 5 2 . 5 v i n = 3 6 v v i n = 1 8 v v i n = 2 4 v 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 2 / 2 5 0 0 - d 1 2 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 5 0 . 5 0 . 7 5 1 1 . 2 5 1 . 5 1 . 7 5 2 2 . 2 5 2 . 5 v i n = 1 8 v v i n = 9 v v i n = 1 2 v
uhe models 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 11 t y p i c a l p e r f o r m a n c e c u r v e s o u t p u t c i u r r e n t ( a m p s ) a m b i e n t t e m p e r a t u r e ( c ) 1 0 9 8 7 6 5 4 3 2 1 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 2 4 v i n , 1 5 0 l f m 2 4 v i n , 3 0 0 l f m 2 4 v i n , s t i l l a i r u h e - 1 . 8 / 1 0 0 0 0 - d 2 4 t e m p e r a t u r e d e r a t i n g o u t p u t c i u r r e n t ( a m p s ) a m b i e n t t e m p e r a t u r e ( c ) 1 0 9 8 7 6 5 4 3 2 1 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 4 8 v i n , s t i l l a i r 7 5 v i n , 1 5 0 l f m 7 5 v i n , s t i l l a i r 4 8 v i n , 1 5 0 l f m u h e - 1 . 8 / 1 0 0 0 0 - d 4 8 t e m p e r a t u r e d e r a t i n g 4 8 v i n , 3 0 0 l f m o u t p u t c i u r r e n t ( a m p s ) a m b i e n t t e m p e r a t u r e ( c ) 1 0 9 8 7 6 5 4 3 2 1 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 4 8 v i n , 1 5 0 l f m 4 8 v i n , 3 0 0 l f m 4 8 v i n , s t i l l a i r u h e - 1 . 2 / 1 0 0 0 0 - d 4 8 a n d u h e - 1 . 5 / 1 0 0 0 0 - d 4 8 t e m p e r a t u r e d e r a t i n g o u t p u t c i u r r e n t ( a m p s ) a m b i e n t t e m p e r a t u r e ( c ) 1 0 9 8 7 6 5 4 3 2 1 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 2 4 v i n , 1 5 0 l f m 2 4 v i n , 3 0 0 l f m 2 4 v i n , s t i l l a i r u h e - 1 . 2 / 1 0 0 0 0 - d 2 4 a n d u h e - 1 . 5 / 1 0 0 0 0 - d 2 4 t e m p e r a t u r e d e r a t i n g 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 2 - 2 5 0 0 - q 4 8 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 5 0 . 5 0 . 7 5 1 1 . 2 5 1 . 5 1 . 7 5 2 2 . 2 5 2 . 5 v i n = 7 5 v v i n = 1 8 v v i n = 4 8 v 9 5 9 0 8 5 8 0 7 5 7 0 6 5 u h e - 1 5 - 2 0 0 0 - q 4 8 e f f i c i e n c y v s . l o a d @ + 2 5 c a m b i e n t o u t p u t c u r r e n t ( a m p s ) e f f i c i e n c y ( % ) 0 . 2 0 . 4 0 . 6 0 . 8 1 1 . 2 1 . 4 1 . 6 1 . 8 2 v i n = 7 5 v v i n = 1 8 v v i n = 4 8 v
xhe series 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s 12 o u t p u t p o w e r ( w a t t s ) a m b i e n t t e m p e r a t u r e ( c ) 3 0 2 5 2 0 1 5 1 0 5 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 u h e - 5 / 6 0 0 0 - d 4 8 t e m p e r a t u r e d e r a t i n g 4 8 v i n , s t i l l a i r 3 6 v i n , s t i l l a i r 7 5 v i n , s t i l l a i r 7 5 v i n , 1 5 0 l f m 7 5 v i n , 3 0 0 l f m o u t p u t p o w e r ( w a t t s ) a m b i e n t t e m p e r a t u r e ( c ) 3 0 2 5 2 0 1 5 1 0 5 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 u h e - 3 . 3 / 7 5 0 0 - d 4 8 t e m p e r a t u r e d e r a t i n g 4 8 v i n , s t i l l a i r 3 6 v i n , s t i l l a i r 7 5 v i n , s t i l l a i r 7 5 v i n , 1 5 0 l f m 7 5 v i n , 3 0 0 l f m o u t p u t p o w e r ( w a t t s ) a m b i e n t t e m p e r a t u r e ( c ) 3 0 2 5 2 0 1 5 1 0 5 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 u h e - 1 2 / 2 5 0 0 a n d u h e - 1 5 / 2 0 0 0 ( a l l m o d e l s ) t e m p e r a t u r e d e r a t i n g 4 8 v i n , s t i l l a i r ( d 4 8 m o d e l s o n l y ) 1 2 v i n , s t i l l a i r 2 4 v i n , s t i l l a i r ( 4 8 v i n , s t i l l a i r f o r q 4 8 m o d e l s o n l y ) o u t p u t p o w e r ( w a t t s ) a m b i e n t t e m p e r a t u r e ( c ) 2 5 2 0 1 5 1 0 5 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 u h e - 5 / 5 0 0 0 - q 1 2 t e m p e r a t u r e d e r a t i n g 2 4 v i n , s t i l l a i r 3 6 v i n , 1 5 0 l f m 3 6 v i n , s t i l l a i r 2 4 v i n , 1 5 0 l f m 2 4 v i n , 3 0 0 l f m 3 6 v i n , 3 0 0 l f m o u t p u t p o w e r ( w a t t s ) a m b i e n t t e m p e r a t u r e ( c ) 2 5 2 0 1 5 1 0 5 0 C 4 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 u h e - 3 . 3 / 7 5 0 0 - q 1 2 t e m p e r a t u r e d e r a t i n g 2 4 v i n , s t i l l a i r 3 6 v i n , 1 5 0 l f m 3 6 v i n , s t i l l a i r 2 4 v i n , 1 5 0 l f m 2 4 v i n , 3 0 0 l f m 3 6 v i n , 3 0 0 l f m t y p i c a l p e r f o r m a n c e c u r v e s
xhe series 1 2 - 3 0 w , s i n g l e o u t p u t d c / d c c o n v e r t e r s ds-0501b 06/04 13 datel makes no representation that the use of its products in the circuits described herein, or the use of other technical information 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 internet: www.datel-europe.com e-mail: datel.ltd@datel.com datel s.a.r.l . montigny le bretonneux, france tel: 01-34-60-01-01 internet: www.datel-europe.com e-mail: datel.sarl@datel.com datel gmbh mnchen, germany tel: 89-544334-0 internet: www.datel-europe.com e-mail: datel.gmbh@datel.com datel kk tokyo, japan tel: 3-3779-1031, osaka tel: 6-6354-2025 internet: www.datel.co.jp email: salestko@datel.co.jp, salesosa@datel.co.jp datel china shanghai, china tel: 011-86-51317131 e -mail: davidx@datel.com datel, inc. 11 cabot boulevard, mans?eld, ma 0204 8 -1151 tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 www.datel.com email: sales@datel.com www.cdpowerelectronics.com iso 9001 registered ? ? a subsidia ry of c&d technologie s high ef?ciency output con?guration: u = unipolar nominal output voltage: 1.2,1.5, 1.8, 2.5, 3.3, 5, 12 or 15 volts maximum rated output current in ma input voltage range: d12 = 9-18 volts (12v nominal) d24 = 18-36 volts (24v nominal) d48 = 36-75 volts (48v nominal) q12 = 9-36 volts (24v nominal) q48 = 18-75 volts (48v nominal) u he 7500 - / d48 - 3.3 n optional functions p a r t n u m b e r s t r u c t u r e r options and adaptations optional functions and part number suf?xes the versatile uhe, 12-30w dc/dc converters offer numerous electrical and mechanical options. per the ordering guide on page 2, the trailing dxx or qxx (where xx stands for 12, 24 or 48v in ) in each part number pertains to the base part number. part-number suf?xes are added after this input identi?cation, indicating the selection of standard options. the resulting part number is a "standard product" and is available to any customer desiring that particular combination of options. the on/off control function on pin 4 employs a positive polarity (on = open or "high," no suf?x). to request a negative polarity on this pin/function, add an "n" suf?x to the part number. standard models have no pins in the pins 5 and 8 positions. for 5-10a models (1.2-5v out ), sense pin/functions can be added to these positions (see pinout p52) by adding an "r" suf?x. an "nr" suf?x can be added for both negative-polarity and sense-pin options. see below. suf?x description blank positive polarity on/off control function (pin 4), v out trim (pin 9), no sense pins, pin length 0.2 inches (5.08 mm). n add negative polarity on the on/off control function, v out trim (pin 9), no sense pins. r positive polarity on the on/off control function, v out trim (pin 9), sense pins in the pin 5 and pin 8 positions (available for low v out models only). nr negative polarity on the on/off control function, v out trim (pin 9), +/Csense pins in the pin 5 and pin 8 positions (available for low v out models only). l1 trim the pin length to 0.110 0.010 inches (2.79 0.25mm). this option requires a 100-piece minimum order quantity. l2 trim the pin length to 0.145 0.010 inches (3.68 0.25mm). this option requires a 100-piece minimum order quantity. t alternate trim con?guration. adaptations there are various additional con?gurations available on uhe, 12-30w dc/ dc's. because designating each of them with a standard part-number suf?x is not always feasible, such are designated by datel in assigning a 5-digit "adaptation code" after the part-number suf?xes. once a con?guration has been requested by a customer and created by datel, the resulting product is available to any customer as a standard off-the-shelf product. contact datel directly if you are interested in your own set of options/adaptations. our policy for minimum order quantities may apply. consequently, the follow - ing product is offered for sale: uhe-5/6000-d48n--30749 standard product, 48v in , 5v/6a output with negative polarity on the on/off control function, modi?ed trim function (5% trim up = 9.09k ? , 5% trim down = 3.83k ? , compatible with uep-30750), integrated soft start and with input ovp and thermal shutdown removed. contact datel directly if you are interested in your own set of options/ adaptations. further examples of such include, but are not limited to the following: ? competitor-compatible pin shape and/or length, instead of datel's standard 40-mil round pins. ? shielded metal case connected to the i/o pin of your choice. ? electrical modi?cation of the v out trim functionality/equations and/or the on/off control function to be competitor-compatible. ? raising the input overvoltage lockout/shutdown trip point to a level that enables the device to experience brief input transients (of known peak value and duration) without shutting down. for example, we can move the threshold to +110v for applications that anticipate 100v, 100msec input transients. lx t note: not all model number combinations are available. contact datel.

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