single output uvq models features low-pro?le, isolated quarter-brick 2.5-40 amp dc/dc converters standard quarter-brick package/pinout outputs from 1.2 to 48v up to 125w low pro?le 0.42" height 24 and 48vdc nominal inputs fully isolated, 2250vdc (basic) insulation designed for rohs compliance output overvoltage and short-circuit protected on/off control, trim and sense functions interleaved synchronous recti?cation yields high ef?ciency to 94% fully protected against temperature and voltage limits ul/iec/en60950 safety approvals qual/halt/emi tested 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 for ef?cient, fully isolated dc power in the smallest space, datels uvq series quarter bricks offer output voltages from 1.2 to 48 volts with currents up to 40 amps. uvqs operate over a wide temperature range (up to +70c at 200 lfm air?ow) at full-rated power. the optional mounting baseplate extends this to all practical tem - perature ranges at full power. uvqs achieve these impressive speci?cations while delivering excellent electri - cal performance. overall noise is 35mvp-p (3.3v models) with fast step response (200 sec). these converters offer high stability even with no load and tight output regulation of 0.125%. the unit is fully protected against input over and undervolt - age, output overcurrent and short circuit. an on-board temperature sensor shuts down the converter if thermal limits are reached. protection may use either the hiccup (auto restart) method or latching (manual restart) termination. a convenient remote on/off control input operates by external digital logic, relay or transistor input. to compensate for longer wiring and to retain output voltage accuracy at the load, uvqs include a sense input to dynamically correct for ohmic losses. a trim input may be connected to a users adjustment potentiometer or trim resistors for output voltage calibration closer than the standard 1% accuracy. uvqs include industry-standard safety certi?cations and basic i/o insulation provides 2250 volt input/output isolation. radiation emission testing is performed to widely-accepted emc standards. contact datel for details on halt quali?ca - tion testing. the uvqs may be considered as higher performance replacements for some datel usq models. Cv in (1 ) +v in (3 ) opt o isola tion pwm contr oller reference & err or amp input under volta ge, input o ver volta ge, and output o ver volta ge comp ara t ors * can be ordered with positiv e (standard) or negativ e (optional) polar ity . remo te on/off contr ol* (2 ) +sense (7 ) Csense (5 ) +v ou t (8 ) v ou t tri m (6 ) Cv ou t (4 ) switch contr ol figure 1. simpli?ed schematic ? ? a subsidiar y of c&d technologies preliminary typical unit
2 performance speci?cations and ordering guide ? model number v out (volts) i out (amps) r/n ( mvp-p) typ. max. regulation (max.) line load v in n om. (volts ) range (volts) i in , no load (ma) i in , full load (amps) ef ?ciency min. typ . case/ pinout uvq-1.2/40-d48 1.2 40 tbd tbd 0.125% 0.25% 48 36-75 tbd tbd tbd tbd c 59 ,p32 uvq-1.5/40-d48 1.5 40 tbd tbd 0.125% 0.25% 48 36-75 tbd tbd tbd tbd c 59 ,p32 uvq-1.8/40-d48 1.8 40 tbd tbd 0.125% 0.25% 48 36-75 tbd tbd tbd tbd c 59 ,p32 uvq- 2.5/35-d24 2.5 35 tbd tbd 0.125% 0.25% 24 18-36 tbd tbd tbd tbd c 59 ,p32 uvq-2.5/40-d48 2.5 40 35 55 0.125% 0.25% 48 36-75 30 1.72 89.5 % 91 % c59,p32 uvq-3.3/35-d24 3.3 35 tbd tbd 0.125% 0.25% 24 18-36 tbd tbd tbd tbd c 59 ,p32 uvq-3.3/35-d48 3.3 35 35 55 0.125% 0.25% 48 36-75 30 2.24 90.5 % 92 % c 59 ,p32 uvq-5/25-d24 5 25 tbd tbd 0.125% 0.25% 24 18-36 tbd tbd tbd tbd c 59 ,p32 uvq-5/25-d48 5 25 35 55 0.125% 0.25% 48 36-75 30 3.36 91.5 % 93 % c 59 ,p32 uvq-12/8-d24 12 8 tbd 100 0.25% 0.25% 24 18-36 120 4.44 89 % 90 % c 59 ,p32 uvq-12/10-d48 12 10 120 tbd 0.125% 0.25% 48 36-75 45 2.69 91 % 93 % c 59 ,p32 uvq-15/7-d24 15 7 125 tbd 0.125% 0.25% 24 18-36 45 4.7 91 % 93 % c 59 ,p32 uvq-15/7-d48 15 7 120 tbd 0.125% 0.25% 48 36-75 45 2.33 92 % 94 % c 59 ,p32 uvq-18/5.6-d24 18 5.6 33 tbd 0.125% 0.25% 24 18-36 45 4.84 92 % 93 % c 59 ,p32 uvq-18/6-d48 18 6 125 185 0.125% 0.25% 48 36-75 45 2.42 92 % 93 % c 59 ,p32 uvq-24/4.5-d24 24 4.5 125 tbd 0.125% 0.25% 24 18-36 45 4.79 93 % 94 % c 59 ,p32 uvq-24/4.5-d48 24 4.5 120 tbd 0.125% 0.25% 48 36-75 45 2.39 93 % 94 % c 59 ,p32 uvq-48/2.5-d48 48 2.5 100 125 0.125% 0.2% 48 36-75 30 2.66 91.5 % 94 % c 59 ,p32 output input (1) all models less than 12v output are tested and speci?ed with 200 lfm air?ow, external 1 and 10 f parallel ceramic/tantalum output capacitors and no external input capacitors. these capacitors are necessary to accommodate our test equipment and may not be required to achieve speci?ed performance in your applications. all models are stable and regulate within spec under no-load conditions. speci?cations are +25c, v in = nominal, v out = nominal, full load. for units with 12v or greater output, an external 33 f low esr input capaci - tor is added. (2) input ripple current is tested and speci?ed over a 5-20 mhz bandwidth. input ?ltering is c in = 33 f tantalum, c bus = 220 f electrolytic, l bus = 12 h. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower air?ow, the dc/dc converter will tolerate shorter full current outputs if the total rms current over time does not exceed the derating curve. (4) mean time before failure is calculated using the telcordia (belcore) sr-332 method 1, case 3, ground ?xed conditions, t pcboard = +25c, full output load, natural air convection. (5) the on/off control may be driven with external logic or by applying appropriate external voltages which are referenced to input common. the on/off control input should use either an open collector/open dr ain transistor or logic gate which does not exceed +v in . the on/off control may also be supplied with negative logic (lo = on, hi = off) under special quantity order. (6) short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) the outputs are not intended to sink appreciable reverse current. if the outputs are forced to sink excessive current, damage may result. (8) output noise may be further reduced by adding an external ?lter. see i/o filtering and noise reduction. (9) all models are fully operational and meet published speci?cations, including cold start at C40c. (10) contact datel for availability of all models. (11) alternate pin length and/or other output voltages are available under special quantity order. restriction of hazardous substance (rohs) compliance the uvq series are designed to comply with rohs requirements in a phased program while retaining high performance, reasonable costs and product availability. for more background, please refer to our website at www.datel.com/rohs_dir.html. or contact datel for full details. uvq series 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s
3 m e c h a n i c a l s p e c i f i c a t i o n s u vq 3.3 20 d48 n - / - remote on/off control polarity: add "p" for positive polarity add "n" for negative polarity quarter-brick package output con?guration: u = unipolar/single nominal output voltage: 2.5/3.3/5/12/1 5 /18/24/48 volts maximum rated output current in amps input voltage range: d48 = 36-75 volts (48v nominal) d24 = 18-36 volts (24v nominal) p a r t n u m b e r s t r u c t u r e b = baseplate installed blank = no baseplate b note: not all model number combinations are available. contact datel. 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s uvq series i/o connections pin function p32 1 Cinput 2 on/off control 3 +input 4 Coutput 5 Csense 6 output trim 7 +sense 8 +output * the remote on/off can be provided with either positive (p suf?x) or negative (n suf?x) polarity. ???????????? ???????????? ? ? ?????????????????????????????????????????? ?????????????????????????????????????? ?????? ??????? ????? ?????? ???? ??????? ? ?????? ??????? ???????????? ???????? ?????? ? ????????????????????????????? ??????????? ? ? ? ? ? ? ? ? ???????????? ???????????? ??????????? ? ????????????? ? ? ?????????????????????????????????????????? ?????????????????????????????????????? ???????????????????? ?????????????????? ????????? ???? ??????? ????? ?????? ???? ??????? ????? ??????? ? ????????????? ???????????? ?????????????? ? ? ????????????????????????????? ??????????? ????????????????????? ?????????????????????????? ???????????????????????? ? ? ? ? ? ? ? ? case c59 with baseplate case c59 alternate pin lengths are available. contact datel. optional baseplate pin is special order. contact datel.
4 uvq series 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s input input voltage range see ordering guide start-up threshold 24v models 16.5-17.5 volts (17v typical) 48v models 34-35.9 volts (35v typical) undervoltage shutdown 24v models 16-17.5 volts (16.75v typical) 48v models 32-35 volts (33.5v typical) overvoltage shutdown 24v models 37-41 volts (39v typical) 48v models not applicable (11) re?ected (back) ripple current (2) 8-15map-p input current: full load conditions see ordering guide inrush transient 0.05-0.1a 2 sec. output short circuit 10-50ma, model dependent no load 24v models 120ma 48v models 30ma low line (v in = v min ) uvq-2.5/35-d48 2.66 amps uvq-3.3/35-d48 3.47 amps uvq-5/25-d48 4.46 amps uvq-12/8-d24 5.93 amps uvq-12/10-d48 3.58 amps uvq-15/7-d24 6.27 amps uvq-15/7-d48 3.10 amps uvq-18/6-d24 6.45 amps uvq-18/6-d48 3.33 amps uvq-24/4.5-d24 6.38 amps uvq-24/4.5-d48 3.19 amps standby mode (off, uv, ot shutdown) 1ma internal input filter type lc reverse polarity protection see fuse information remote on/off control (5) positive logic (p model suf?x) off = ground pin to +0.8 v max. on = open pin or +3.5v min. to +13.5v max. negative logic (n model suf?x) on = ground pin to +0.8 v max. off = open pin or +3.5v min. to +13.5v max. current 2 ma maximum output voltage output range see ordering guide voltage output accuracy 1 % of v nom voltage adjustment range (12) C20% to +10% of nominal temperature coef?cient 0.02% of v ou t range per c minimum loading no minimum load remote sense compensation +10% maximum capacitive loading (low esr <0.02 ? max.) uvq-2.5/35-d48 10,000 f typ., 20,000 f max. uvq-3.3/35-d48 10,000 f typ., 20,000 f max. uvq-5/25-d48 10,000 f typ., 20,000 f max. uvq-12/8-d24 4700 f max. uvq-12/10-d48 4700 f typ., 10,000 f max. uvq-15/7-d24 4700 f typ., 10,000 f max. uvq-15/7-d48 4700 f typ., 10,000 f max. uvq-18/6-d24 4700 f max. uvq-18/6-d48 2200 f typ., 4700 f max. uvq-24/4.5-d24 4700 f typ., 10,000 f max. uvq-24/4.5-d48 4700 f typ., 10,000 f max. uvq-48/2.5-d48 10,000 f max. ripple/noise (20mhz bandwidth) see ordering guide (8) line/load regulation see ordering guide (10) (see tech. notes) ef?ciency see ordering guide isolation voltage input to output 2250vdc min. input to baseplate 1500vdc min. baseplate to output 1000vdc min. isolation resistance 100m ? isolation capacitance 1500pf isolation safety rating basic insulation current limit inception (98% of v out ) uvq-2.5/40-d48 45 amps uvq-3.3 42 amps uvq-5/25-d48 40 amps uvq-12/8-d24 10 amps uvq-12/10-d48 12.5 amps uvq-15/7 10 amps uvq-18 7 amps uvq-24 6 amps uvq-48/2.5-d48 4 amps short circuit protection method (6) current limiting with hiccup autorestart. remove overload for recovery. short circuit current uvq-2.5/40-d48 4 amps uvq-3.3/35 3.5 amps uvq-5/25-d48 2.5 amps uvq-12/8-d24 0.8 amps uvq-12/10-d48 1 amps uvq-15/7 0.7 amps uvq-18/5.6-d24 0.5 amps uvq-18/6-d48 0.6 amps uvq-24/4.5 0.5 amps uvq-48/2.5-d48 0.25 amps short circuit duration continuous, output shorted to ground (no damage) overvoltage protection 2.5 or 3.3v output tbd 5v output 6vdc 12v outputs 14.4vdc 15v outputs 18vdc 18v outputs 22vdc 48v outputs 55vdc method magnetic feedback dynamic characteristics dynamic load response (50% to 100% load step) 2.5 or 5v outputs 200 sec to 1% of ?nal value 3.3 or 5v outputs 150 sec to 1% of ?nal value 12v d24 outputs 50 sec to 1% of ?nal value 12v d48 outputs 75 sec to 1% of ?nal value 15v outputs 75 sec to 2% of ?nal value 18v d24 outputs 50 sec to 1% of ?nal value 18v d48 outputs 75 sec to 1% of ?nal value 24v outputs 75 sec to 2% of ?nal value 48v outputs 150 sec to 2% of ?nal value start-up time 50msec for v out = nominal (v in on to v out regulated or on/off to v out ) switching frequency 2.5, 3.3, 5v, 48 models 600 50khz 12v models 290 30khz 15, 24v models 200khz 18v models 240 25khz performance/functional speci?cations typical @ t a = +25c under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
removal of soldered uvq's from printed circuit boards should removal of the uvq from its soldered connection be needed, thor - oughly de-solder the pins using solder wicks or de-soldering tools. at no time should any prying or leverage be used to remove boards that have not been properly de-soldered ?rst. input source impedance uvq converters must be driven from a low ac-impedance input source. the dc/dcs 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. i/o filtering, input ripple current, and output noise all models in the uvq series are tested/speci?ed for input ripple current (also called input re?ected ripple current) and output noise using the circuits and layout shown in figures 2 and 3. 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 3 1 +input Cinput current pr obe to oscilloscope + C t e c h n i c a l n o t e s external input capacitors (c in in figure 2) serve primarily as energy-stor - age elements. they 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. 5 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s uvq series environmental calculated mtbf (4) tbd hours operating temperature range (ambient) no baseplate no derating, 200 lfm air?ow C40 to +70c (9) (all models except 18v-d24) no derating, 200 lfm air?ow C40 to +45c (18v-d24 models) with derating see derating curves operating temperature with baseplate C40 to +110c maximum (no derating required) (3) (13) storage temperature range C55 to +125c thermal protection/shutdown +110c density altitude 0 to 10,000 feet relative humidity 10% to 90%, non-condensing physical outline dimensions see mechanical speci?cations baseplate material aluminum pin material solder-coated brass weight tbd ounces (tbd grams) electromagnetic interference fcc part 15, class b, en55022 (conducted and radiated) (may need external ?lter) safety ul/cul 60950 csa-c22.2 no.234 iec/en 60950 (1) all models are tested and speci?ed with 200 lfm air?ow, external 1||10 f ceramic/tantalum output capacitors and a 33 f external input capacitor. all capacitors are low esr types. these capacitors are necessary to accommodate our test equipment and may not be required to achieve speci?ed performance in your applications. all models are stable and regulate within spec under no-load conditions. general conditions for speci?cations are +25c, v in =nominal, v out = nominal, full load. (2) input ripple current is tested and speci?ed over a 5-20mhz bandwidth. input ?ltering is c in = 33 f tantalum, c bus = 220 f electrolytic, l bus = 12 h. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower air?ow, the dc/dc converter will tolerate brief full current outputs if the total rms current over time does not exceed the derating curve. (4) mean time before failure is calculated using the telcordia (belcore) sr-332 method 1, case 3, ground ?xed conditions, tpcboard = +25c, full output load, natural air convection. (5) the on/off control may be driven with external logic or by applying appropriate external voltages which are referenced to input common. the on/off control input should use either an open collector/open drain transistor or logic gate which does not exceed +13.5v. (6) short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) the outputs are not intended to sink appreciable reverse current. sinking excessive reverse current may damage the outputs. ( 8) output noise may be further reduced by adding an external ?lter. see i/o filtering and noise reduction. (9) all models are fully operational and meet published speci?cations, including cold start at C40c. (10) regulation speci?cations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) overvoltage shutdown on 48v input models is not supplied in order to comply with telecom reliability requirements. these requirements attempt continued operation despite signi?cant input overvoltage. (12) do not exceed maximum power speci?cations when adjusting the output trim. (13) note that the converter may operate up to +110c with the baseplate installed. however, thermal self-protection occurs near +110c. therefore, +100c is recommended to avoid thermal shutdown. absolute maximum ratings input voltage 24v models 48v models continuous 0 to +36v 0 to +75v transient (100 ms) +50v +100v on/off control C0.3 v min to +13.5v max. input reverse polarity protection see fuse section output overvoltage v out +20% max. output current (note 7) current-limited. devices can withstand sustained short circuit without damage. storage temperature C55 to +125c lead temperature (soldering 10 sec.) +300c absolute maximums 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 nor recommended.
figure 3. measuring output ripple/noise (pard) start-up threshold and undervoltage shutdown under normal start-up conditions, the uvq series will not begin to regulate properly until the ramping input voltage exceeds the start-up threshold. once operating, devices will turn off when the applied voltage drops below the undervoltage shutdown point. devices will remain off as long as the undervoltage condition continues. units will automatically re-start when the applied voltage is brought back above the start-up threshold. the hyster - esis built into this function avoids an indeterminate on/off condition at a single input voltage. see performance/functional speci?cations table for actual limits. start-up time the v in to v out start-up time is the interval between the point at which a ramping input voltage crosses the start-up threshold voltage and the point at which the fully loaded output voltage enters and remains within its speci - ?ed 1% 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 that the converter is turned off via the remote on/off control with the nominal input voltage already applied. c1 c1 = 1f cerami c c2 = 10f t ant alum lo ad 2-3 inches (51-76mm) fr om module c2 r lo ad 7 8 copper stri p 4 5 copper stri p scope +output Coutput +sense Csense in critical applications, 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. in figure 3, the two copper strips simulate real-world pcb impedances between the power supply and its load. scope measurements should be made using bnc connectors or the probe ground should be less than ? inch and soldered directly to the ?xture. 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 be taken into consideration. os-con tm organic semiconductor capacitors (www.sanyo.com) can be especially effective for further reduction of ripple/noise. 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 devices internal ?ltering to meet your speci?c requirements. contact our applications engineering group for additional details. on/off control the primary-side, remote on/off control function (pin 2) can be speci?ed to operate with either positive or negative polarity. positive-polarity devices ("p" suf?x) are enabled when pin 2 is left open or is pulled high. positive-polarity devices are disabled when pin 2 is pulled low (0-0.8v with respect to Cinput). negative-polarity devices are off when pin 2 is high/open and on when pin 2 is pulled low. see figure 4. dynamic control of the remote on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appropriate). the drive circuit should be able to sink appropriate current (see performance speci?cations) when activated and withstand appropriate voltage when deactivated. current limiting when power demands from the output falls within the current limit inception range for the rated output current, the dc/dc converter will go into a current limiting mode. in this condition the output voltage will decrease proportion - ately with increases in output current, thereby maintaining a somewhat constant power dissipation. this is commonly referred to as power limiting. current limit inception is de?ned as the point where the full-power output voltage falls below the speci?ed tolerance. if the load current being drawn from the converter is signi?cant enough, the unit will go into a short circuit condition. see short circuit condition. short circuit condition when a converter is in current limit mode the output voltages 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 of about 50 milliseconds, the pwm will restart, causing the output voltages to begin ramping to their appropriate values. if the short-circuit condition per - sists, 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 uvq is capable of enduring an inde?nite short circuit output condition. thermal shutdown uvq converters are equipped with thermal-shutdown circuitry. if the internal temperature of the dc/dc converter rises above the designed operating tem - perature (see performance speci?cations), 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. figure 4. driving the remote on/off control pin ? ? ? ??? ??? ? ?? ? ? ? ?????????????????????? ?????????????????????? ???????????? ??????? ?? ? ? ? ? ? ? ?? ? ? ? ? ? ?? ? ? ?????? 6 uvq series 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s
output overvoltage protection the output voltage is monitored for an overvoltage condition via magnetic coupling to the primary side. if the output voltage rises to a fault condition, which could be damaging to the load circuitry (see performance speci?ca - tions), the sensing circuitry will power down the pwm controller causing the output voltage to decrease. following a time-out period the pwm will restart, causing the output voltage to ramp to its appropriate value. if the fault condi - tion 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. input reverse-polarity protection if the input-voltage polarity is accidentally reversed, an internal diode will become forward biased and likely draw excessive current from the power source. if the source is not current limited or the circuit appropriately fused, it could cause permanent damage to the converter. 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 a sustained, non-current-limited, input-v oltage polar - ity reversal exists. for datel uvq series dc/dc converters, slow-blow fuses are recommended with values no greater than twice the maximum input current. trimming output voltage uvq converters have a trim capability (pin 6) that enables users to adjust the output voltage from +10% to C20% (refer to the trim equations). adjustments to the output voltage can be accomplished with a single ?xed resistor as shown in figures 5 and 6. a single ?xed resistor can increase or decrease the output voltage depending on its connection. resistors should be located close to the converter and have tcr's less than 100ppm/c to minimize sensitivity to changes in temperature. if the trim function is not used, leave the trim pin open. standard uvq's have a "positive trim" where a single resistor connected from the trim pin (pin 6) to the +sense (pin 7) will increase the output volt - age. a resistor connected from the trim pin (pin 6) to the Csense (pin 5) will decrease the output voltage. trim adjustments greater than the speci?ed +10%/C20% can have an adverse affect on the converters 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). temperature/power derating is based on maximum output current and volt - age at the converter's output pins. use of the trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the uvq'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 the trim pin (pin 6) is a relatively high impedance node that can be suscep - tible to noise pickup when connected to long conductors in noisy environ - ments. in such cases, a 0.22 f capacitor to Coutput can be added to reduce this long lead effect. lo ad r trim do wn +output Cinput +input on/off contr ol trim +sense Coutput Csense 4 5 1 3 6 8 7 2 ???? ? ??????? ??????? ?????? ?????? ?????? ??????? ???? ?????? ??????? ?????? ? ? ? ? ? ? ? ? figure 5. trim connections to increase output voltages using fixed resistors figure 6. trim connections to decrease output voltages using fixed resistors 7 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s uvq series
note: higher output 24v and 48v converters require larger, low-tempco, precision trim resistors. an alternative is a low-tc multi-turn potentiometer (20k ? typical) connected between +v out and C v out with the wiper to the trim pin. uvq series 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s 8 typical performance curves ?? ?? ?? ?? ?? ?? ?? ?? ?? ??????????????? ???????????????????????????????????????????????? ? ?? ??? ?? ?? ??? ??? ??? ??? ??? ??? ?? ??????????????????? ???????????? ? ? ? ??? ????? ? ??? ????? ? ??? ????? ?? ?? ?? ?? ?? ?? ?? ?? ????????????? ???????????????????????????????????????????????? ? ?? ??? ???? ???? ???? ???? ?? ???? ???? ???? ???? ? ??????????????????? ???????????? ? ? ? ??? ????? ? ??? ????? ? ??? ????? ??? ? ?? ? ?? ? ?? ? ???? ? ??????? ?? ??? ? ? ???? ?????? ? ? ? ??????? ???? ? ?? ?? ? ???????????? ?? ??? ? ? ???? ????? ???? ?? ? ?? ? ?? ? ??????? ?? ??? ? ? ???? ?????? ? ? ? ??????? ?? ? ?? ?? ? ???????????? ?? ??? ? ? ???? ????? ???? ?? ? ?? ? ??? ? ??????? ?? ??? ? ? ???? ?????? ? ? ? ??????? ??? ? ?? ?? ? ???????????? ?? ??? ? ? ???? ????? ???? ?? ? ?? ? ??? ? ??????? ?? ??? ? ? ???? ?????? ? ? ? ??????? ??? ? ?? ?? ? ???????????? ?? ??? ? ? ???? ????? ???? ?? ? ?? ? ??? ? ??????? ?? ??? ? ? ???? ?????? ? ? ? ??????? ??? ? ?? ?? ? ???????????? ?? ??? ? ? ???? ???? ???? ??????????????? ????????????? ????????????????????????? ??????????????????? ?????????????????????????? ?? ? ?? ? ???? ? ??????? ?? ??? ? ? ???? ???? ? ? ? ??????? ???? ? ?? ?? ? ???????????? ?? ??? ? ? ???? ????? ???? ??????????????? ??????????????? ??????????????? ??????????????? ?? ? ?? ????? ? ??????? ?? ???? ? ????? ??????? ? ????????? ??????? ?? ? ???????????? ?? ???? ? ????? ????? ???? ?? ? ?? ????? ? ??????? ?? ???? ? ???? ?????? ? ????????? ??????? ?? ? ???????????? ?? ???? ? ???? ???? ???? ?? ? ?? ????? ? ??????? ?? ???? ? ???? ?????? ? ????????? ??????? ?? ? ???????????? ?? ???? ? ???? ???? ???? ????? ? ????????? ?? ? ?? ???? ? ??????? ?? ???? ? ???? ?????? ?? ? ???????????? ?? ???? ? ???? ????? ???? ?????????????????????? ? ???? ? ?? ? ????????? ?? ? ?? ???? ? ??????? ?? ???? ? ???? ?????? ?? ? ???????????? ?? ???? ? ???? ??? ???? ????????????????
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 subsidiar y of c&d technologies 9 ?? ?? ?? ?? ? ? ? ? ? ?????????????? ?????????????????????????????????????? ? ?? ??? ?? ?? ??? ??? ??? ??? ??? ??? ?? ??????????????????? ?????????????????????????? ? ??? ????? ds-0549 02/05 2 . 5 - 4 0 a m p i s o l a t e d d c / d c c o n v e r t e r s uvq series ?????????????????????????????????????????????????? ???????????????? ?? ??????????????????????????? ? ????????????????????? ????????????????????? ??? ??? ? ??? ? ??? ? ??? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?? ??????? ??????? ??????? ??????? ?????????????????????????????????????????????????? ?????????????????? ?? ??????????????????????????? ? ????????????????????? ????????????????????? ??? ??? ? ??? ? ??? ? ??? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?? ??????? ??????? ??????? ??????? ?? ?? ?? ?? ? ? ? ? ? ???????????? ?????????????????????????????????????? ? ?? ??????????????????? ?????????????????????????? ? ??? ????? ? ??? ????? ? ??? ????? ??? ???? ???? ???? ???? ?? ???? ???? ???? ???? ? typical performance curves
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