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wide input voltage ranges up to 75 v dc single output up to 15 v dc 1500 v dc i/o electric strength test voltage ? industry standard pin-out ? rohs lead-solder-exempt compliant ? fixed frequency operation ? high efficiency up to 90% ?2" x 1.6" platform with 8.5 mm profile without and 10.5 mm profile with case ?softstart ? shut down input, output voltages adjustable ? programmable input undervoltage lockout ? outputs no-load, overload and short-circuit proof ? operating ambient temperature C40...105 o c ? thermal protection with auto-reset (non latching) ? basic insulation ? immunity to iec/en 61000-4-2,-3,-4,-5 and -6 table of contents page description......................................................................... 1 type survey and key data ............................................. 2 type key ......................................................................... 2 functional description .................................................... 2 electrical input data ........................................................ 3 electrical ouput data ...................................................... 4 page temperature derating ..................................................... 5 auxiliary functions .......................................................... 6 electromagnetic compatibility (emc) ............................. 7 immunity to environmental conditions ........................... 8 mechanical data ............................................................. 9 safety and installation instructions ............................... 10 description of option .................................................... 11 description the ims25 series of board-mountable 25 watt dc-dc con- verters has been designed according to the latest industry requirements and standards. the converters are particu- larly suitable for applications in industry and telecommuni- cation where variable input voltages or high transient volt- ages are prevalent. providing two wide input voltage ranges, 14 to 36 vdc and 32 to 75 vdc, the units are available with a single output voltage from 2.5 vdc up to 16.5 vdc externally adjust- able. a shut down input allows remote converter on/off. features include efficient input and output filtering with un- surpassed transient and surge protection, low output ripple and noise, consistently high efficiency over the entire input voltage range, high reliability as well as excellent dynamic response to load and line changes. the converters provide basic insulation with selv outputs as e.g., required in battery supported systems where the bus voltage may exceed the selv limit of 60 vdc. they are designed and built according to the in- ternational safety standards iec/en 60950, ul 1950, can/ csa c22.2 no.950-95. the circuit comprises integrated planar magnetics and all components are automatically assembled and soldered onto a single pcb without any wire connections. the pro- prietary magnetic feedback solution ensures maximum reli- ability and repeatability in the control loop over all operating conditions. careful considerations of possible thermal stresses ensure the absence of hot spots providing long life in environments where temperature cycles are a reality. the thermal design allows operation at full load up to an ambi- ent temperature of 71 c in free air without using any potting material. for extremely high vibration environments the ca- se has holes for screw mounting. safety according to iec/en 60950, ul 1950 approvals pending 54.9 2.16" 54.9 2.16" 10.5 0.41" 50.8 2." 41.2 1.62" 8.2 0.32" l g a ims25 25-watt dc-dc converter data sheet mar 04, 2002 revised to apr 17, 2006 page 1 of 11 www.power-one.com features
functional description the ims25 series of dc-dc converters are magnetic feed- back controlled forward converters using current mode pwm (pulse width modulation). the 2.5, 3.3, and 5.1 v out- put voltage versions feature a synchronous rectifier result- ing in very high efficiency. the output voltage of these ver- sions can be adjusted via the trim input. the trim input is referenced to the secondary side and allows for program- ming of the output voltage in the range of approximately 90 to 110% of v o nom using an external resistor. the voltage regulation is achieved with a magnetic feed- back circuit providing excellent line and load regulation. current limitation is provided by the primary circuit, thus limiting the total output current to approx. 150% ?i o nom (see: type survey) . the shut down input allows remote converter on/off. overtemperature protection will shut down the unit in ex- cessive overload conditions with automatic restart. fig. 1 block diagram pwm 17 1 2 4 13 15 vi+ sd i vi C vo+ voC trim 03096 3 w type key 24 ims 25 - 2.5 -9 g i z input voltage range v i 14 to 36 vdc .............................................. 24 32 to 75 vdc .............................................. 48 series ...................................................................... ims 25 output voltage type output .................... 2.5, 03, 05, 12, 15 operating ambient temperature range t a (100% load @0 lfm) C40 to 71 c ................................................-9 synchronous rectifier ...................................................... g option: inhibit ............................................................ i open frame .................................................. z examples: 48 ims 25-12-9z: dc-dc converter, input voltage range 32 to 75 v, output 12 v, 2 a, no case. 24 ims 25-2.5-9g: dc-dc converter, input voltage range 14 to 36 v, output 2.5 v, 6 a. type survey and key data table 1: type survey output 1 output power input voltage range and efficiency option u o1 nom i o1 nom p onom v i min to v imax typ v imin to v imax typ [v dc] [a] [w] 14 to 36 vdc [%] 32 to 75 vdc [%] 2.5 6 15 24ims25-2.5-9g 82 48ims25-2.5-9g 85 i 3.3 6 19.8 24ims25-03-9g 86 48ims25-03-9g 87 z 5.1 5 25.5 24ims25-05-9g 87 48ims25-05-9g 90 12 2 24 24ims25-12-9 88 48ims25-12-9 89 15 1.6 24 24ims25-15-9 88 48ims25-15-9 89 mar 04, 2002 revised to apr 17, 2006 page 2 of 11 www.power-one.com model numbers highlighted in yellow or shaded are not recommended for new designs. ims25 25-watt dc-dc converter data sheet
electrical input data general conditions: Ct a = 25c, unless t c is specified. C shut down pin left open circuit (not connected). C trim input not connected. table 2: input data s m i 8 4 s m i 4 2 t u p n i t i n u x a m p y t n i m x a m p y t n i m s n o i t i d n o c s c i t s i r e t c a r a h c u i input voltage range 1 t cmin ... t cmax 14 5 36 32 75 v dc u inom nominal input voltage i o = 0... i o nom 8 4 4 2 u isur 0 0 1 0 5 s 3 x a m e g r u s t u p n i e v i t i t e p e r voltage t start up converter switch on u i min , i o = i o nom 2 0.25 0.5 0.25 0.5 s start-up time 1 . 0 1 . 0 h g i h d s t rise s m 5 5 e m i t e s i r i inl no load input current i o =0, u imin ... u imax 75 150 40 80 ma sd high c i 0 . 2 0 . 2 n o i t a l u c l a c e g r u s r o f e c n a t i c a p a c t u p n i m f u sd shut down voltage unit disabled C10 0.7 C10 0.7 v dc unit operating 2.0 5.5 2.0 5.5 i sd a m 2 1 2 1 t u p n i d s f o t n e r r u c t u p n i i inr p inrush peak current 4 u i = u inom a 5 . 1 3 i irr reflected i o = 0... i o nom 100 3 60 ma pp ripple current 1 u imin will not be as stated if u o is increased above u onom by use of the trim input. if the output voltage is set to a higher value, u imin will be proportionally increased. 2 measured with a resistive and the max. admissible capacitive load. 3 24ims25-12/15 use a 470 uf 50vdc electrolytic capacitor to achieve less than 30 mapp (nichicon tvx1h100maa or equivalent) 4 source impedance according to prets 300132-2, version 4.3. 5 linear derating to 85% of i onom for u i <16.8 v. inrush current the inrush current has been kept as low as possible by choosing a very small input capacitance. fig. 2 typical inrush current at u i nom ,p o nom versus time (48 ims 25-05-9g). source impedance according to prets 300132-2, version 4.3 at u inom . C1 0 1 2 3 4 5 6 7 8 t [ms] C2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 i [a] 04058 mar 04, 2002 revised to apr 17, 2006 page 3 of 11 www.power-one.com ims 25 25-watt dc-dc converter data sheet
input transient voltage protection a built-in suppressor diode provides effective protection against input transients which may be caused for example by short-circuits accross the input lines where the network inductance may cause high energy pulses. table 3: built-in transient voltage suppressor type breakdown peak power peak pulse voltage at 1 ms current v br nom [v] p p [w] i pp [a] 24 ims 25 53 600 7.7 48 ims 25 100 600 4.1 for very high energy transients as for example to achieve iec/en 61000-4-5 or etr 283 (19 pfl1) compliance (as per table: electromagnetic immunity ) an external inductor and capacitor are required. vi+ viC c l v+ vC module + 04009 1 2 fig. 3 example for external circuitry to comply with iec/en 61000-4-5 or etr 283 (19 pfl1) (48 ims 25 types). table 4: components for external circuitry to comply with iec/en 61000-4-5, level 2 or etr 283 (19pfl1) (48 ims types). circuit ref. 24 ims 25 48 ims 25 0 5 1 l m h c 150 m f, 63 v, 85c 100 m f, 100 v, 85c reverse polarity protection at the input the built-in suppressor diode also provides for reverse po- larity protection at the input by conducting current in the re- verse direction. an external fuse is required to limit this cur- rent: 24 ims 25: 5 a (f5a) 48 ims 25: 3.15 a (f3.15a) electrical ouput data general conditions: t a = 25c, unless t c is specified. shut down pin left open (not connected). trim input not connected. table 5a: output data v 1 . 5 v 3 . 3 v 5 . 2 t u p t u o n i m x a m p y t n i m s n o i t i d n o c s c i t s i r e t c a r a h c typ max min typ max unit u o1 output voltage u i nom , i o = 0.5 i o nom 2.47 2.53 3.26 3.34 5.05 5.15 v i o nom output current u imin ... u imax 060605a i ol current limit 1 u imin 999 $ u o line/load regulation (combined) u imin ... u imax 1 1 1 % u o1 output voltage noise 2 (b/w 20mhz) i o = (0.01...1) i o nom 100 100 120 mv pp c oext admissible capacitive load 3 2200 2200 2200 m f u o d dynamic voltage deviation u inom 250 250 400 mv t d load recovery time i o nom s 1 / 2 i onom 552ms regulation a uo temperature coefficient u inom , i o nom 0.02 0.02 0.02 %/k $ u o / $ t c t cmin ... t cmax 1 the current limit is primary side controlled. 2 measured with 1 m f ceramic capacitor across the o/p terminals 3 measured with constant resistance load fs switching frequency u i nom , i o nom approx 330 approx 330 approx 330 khz ims 25 25-watt dc-dc converter data sheet mar 04, 2002 revised to apr 17, 2006 page 1 of 11 www.power-one.com
thermal considerations if a converter, mounted on a pcb, is located in free, quasi- stationary air (convection cooling) at the indicated maxi- mum ambient temperature t amax (see table: temperature specifications ) and is operated at its nominal input voltage and output power, the case temperature t c measured at the measuring point of case temperature t c (see: mechanical data ) will approach the indicated value t cmax after the warm-up phase. however, the relationship between t a and t c depends heavily on the conditions of operation and inte- gration into a system. the thermal conditions are influenced by input voltage, output current, airflow, temperature of sur- rounding components and surfaces and the properties of the printed circuit board. t amax is therefore only an indica- tive value and under practical operating conditions, the ad- missible ambient temperature t a may be higher or lower than this value. caution: the case temperature t c measured at the measuring point of case temperature t c (see: mechani- cal data ) must under no circumstances exceed the specified maximum value. the installer must ensure that under all operating conditions t c remains within the lim- its stated in the table: temperature specifications. table 5b: output data v 5 1 v 2 1 t u p t u o x a m p y t n i m s n o i t i d n o c s c i t s i r e t c a r a h c min typ max unit u o1 output voltage u i nom , i o = 0.5 i o nom 11.88 12.12 14.85 15.15 v i o nom output current u imin ... u imax 0201.6a i ol current limit 1 u imin 3 2.4 $ u o line/load regulation (combined) u imin ... u imax 1 1 % u o1 output voltage noise 2 (b/w 20mhz) i o = (0.01...1) i o nom 150 180 mv pp c oext admissible capacitive load 3 650 430 m f u o d dynamic voltage deviation u inom 600 750 mv t d load recovery time i o nom s 1 / 2 i o nom 11ms regulation a uo temperature coefficient u inom , i o nom 0.02 0.02 %/k $ u o / $ t c t cmin ... t cmax fs switching frequency u i nom ... i onom approx 200 approx 200 khz fig. 5 overload switch off (hiccup mode), typical values. 100 u o [%] t [ms] 05162 100 10 0 1 the current limit is primary side controlled. 2 measured with 1 m f ceramic capacitor across the o/p terminals 3 measured with constant resistance load overtemperature protection the converters are protected from possible overheating by means of an internal non latching temperature monitoring circuit. it shuts down the unit above the internal tempera- ture limit and attempts to automatically restart in short peri- ods. this feature prevents from excessive internal tempera- ture excursion which could occur in heavy overload condi- tions. fig. 4 power derating for uncased (-z) versions in airflow. output pow e r vs am bie nt te m p. a nd airflow 0 20 40 60 80 10 0 12 0 0 10 2030 40506070 8090100105 a mbient temp. (deg c) output power (%) 200lfm (1 m /s) 0lfm short circuit behaviour the current limit characteristic shuts down the converter whenever a short circuit or an overload is applied to its out- put. it acts self-protecting and automatically recovers after removal of the overload condition (hiccup mode). mar 04, 2002 revised to apr 17, 2006 page 5 of 11 www.power-one.com
table 6: typical values for undervoltage lockout (pul) settings. 24 ims 25 48 ims 25 r ext [k 7 ] u i min [v] r ext [k 7 ] u i min [v] 1 3 5 . 3 1 250 15 50 34 100 16 29 36 60 17 20 38 30 18 15 40 auxiliary functions shut down function the outputs of the converters may be enabled or disabled by means of a logic signal (ttl, cmos, etc.) applied to the shut down pin. if the shut down function is not required then pin should be left open-circuit. vo+ vi+ viC voC 06133 r ext sd synchronisation the ims 25 features a bi-directional synchronisation func- tion to synchronise several ims 25 units operated in parallel connection. consult factory if this option is required, for full application details. adjustable output voltage as a standard feature, the ims 25 units offer adjustable out- put voltage by using the secondary referenced trim input. if the trim input is left open-circuit the output voltage is set to u o nom . adjustment of the output voltage is possible by means of an external resistor r ext connected between the trim pin and the either vo+ or voC. u o nom u o t start up t rise t 04008 fig. 7 converter start-up and rise time (applying u inom ). converter operating: 2.0...5.5 v converter shut down: C10...0.7 v the shut down pin can also be used as a programmable undervoltage lockout. the undervoltage lockout values for the 24 ims and 48 ims series are 13 and 31 v respectively with a 0.5 v hysteresis window. these factory settings can be trimmed up by means of an external resistor connected between the sd pin and viC pin. fig. 8 shut down (sd) and undervoltage lockout (pul) function. vo+ vi+ viC voC 06134 trim r ext 1 r ext 2 fig. 9 output voltage trim. table 7: constant values to adjust u o from 90...110% u onom ; typical values (u inom ,i o = 0.5 i onom ) u onom abcd 2.5 2200 1000 2728 1.24 3.3 1800 1800 2229 1.24 5.1 1000 430 1240 1.24 12 5100 5100 12750 2.5 15 6200 10000 15500 2.5 to trim down u onom :- r ext 1 = [ a * (u o - d) / (u onom -u o )]-b to trim up u onom :- r ext 2 = (c / (u o - u onom )) - b ims 25 25-watt dc-dc converter data sheet mar 04, 2002 revised to apr 17, 2006 page 6 of 11 www.power-one.com
electromagnetic immunity table 8: immunity type tests phenomenon standard 1 class coupling value waveform source test in per- level mode 2 applied imped. procedure oper. form. 3 electrostatic iec/en 2 contact discharge 4000 v p 1/50 ns 330 7 10 positive and yes b discharge 61000-4-2 3 air discharge 8000 v p 10 negative to case discharges electromagnetic iec/en 2 antenna 3 v/m am 80% 261000 mhz yes a z h k 1 3 - 4 - 0 0 0 1 6 d l e i f z h m 0 0 9 y t u d % 0 5 , m p 4 0 2 0 5 v n e cycle, 200 hz resp. frequ. electrical fast iec/en 3 direct +i/Ci 2000 v p bursts of 5/50 ns 50 7 1 min positive yes a e v i t a g e n n i m 1 e t a r . p e r z h k 5 4 - 4 - 0 0 0 1 6 t s r u b / t n e i s n a r t transients with transients per 15 ms burst coupling mode duration and a 300 ms period surge iec/en 2 +i/Ci 1000 v p 1.2/50 s 2 7 5 pos. and 5 neg. yes b 61000-4-5 5 impulses per coupling mode conducted iec/en 2 +i/Ci 3 v rms am modulated 50 7 0.15...80 mhz yes a b d 0 3 1 ( 6 - 4 - 0 0 0 1 6 s e i c n a b r u t s i d m v) 80%, 1 khz 150 7 transient etr 283 +i/Ci 150 v p 0.1/0.3 ms limited to 3 positive yes b (19 pfl 1) 4 <100 a 1 related and previous standards are referenced in: technical information: standards . 2 i = input, o = output. 3 a = normal operation, no deviation from specification, b = temporary deviation from specs. possibe. 4 for 48 ims 25 types (additional external components required). not applicable for 24 ims 25 types. 5 external components required. which typically occur in many installations, but especially in battery driven mobile applications. electromagnetic compatibility (emc) a suppressor diode together with an input filter form an ef- fective protection against high input transient voltages fig. 10 circuit required to meet level b of cispr 22/en 55022, measured at u i nom and i onom . emc specifications e c n e r e f e r r o t a n g i s e d n o i t p i r c s er de b m u n t r ar po d n e v 1 0 r t 0 8 m n o m m o c h e k o h c e d o m 4 3 0 0 d p e s l u p g n i r e e n i g n e 1 0 c 1 m c i m a r e c f r o t i c a p a c a 4 t a k 5 0 1 c 4 2 1 8x 1v a 1 0 l7 4 m r o t c u d n i3 h7 4 - p 2 2 0 5 st df a r c l i o c 2 0 c 7 4 m c i t y l o r t c e l e f r o t i c a p a c t - 6 7 4 9 d - 8 8 5 1 4s bn e m e i s 3 0 c c i m a r e c f n 0 3 1 r o t i c a p a c t n 1 0 1 m 4 3 1 b 6 0 2p 1a c a v o n mar 04, 2002 revised to apr 17, 2006 page 7 of 11 www.power-one.com
immunity to environmental conditions table 9: environmental testing s u t a t s s n o i t i d n o c t s e t d r a d n a t s d o h t e m t s e t ca damp heat iec/din iec 60068-2-3 temperature: 40 2 t o n t i n u c steady state mil-std-810d section 507.2 relative humidity: 93 +2/-3 g n i t a r e p o % duration: 56 days ea shock iec/en/din en 60068-2-27 acceleration amplitude: 50 g n = 490 m/s 2 unit g n i t a r e p o s m 1 1 : n o i t a r u d p m u b 3 . 6 1 5 n o i t c e s d 0 1 8 - d t s - l i m ) l a d i o s u n i s - f l a h ( number of bumps: 18 (3 each direction) eb bump iec/en/din en 60068-2-29 acceleration amplitude: 25 g n = 245 m/s 2 unit g n i t a r e p o s m 1 1 : n o i t a r u d p m u b 3 . 6 1 5 n o i t c e s d 0 1 8 - d t s - l i m ) l a d i o s u n i s - f l a h ( number of bumps: 6000 (1000 each direction) fc vibration iec/en/din en 60068-2-6 acceleration amplitude: 0.35 mm (10...60 hz) unit g 5 ) l a d i o s u n i s ( n =49m/s 2 (60...2000 hz) operating frequency (1 oct/min): 10...2000 hz test duration: 7.5 h (2.5 h each axis) kb salt mist, cyclic iec/en/din iec 60068-2-52 concentration: 5% (30c) unit not g n i t a r e p o e l c y c r e p h 2 : n o i t a r u d e d i r o l h c m u i d o s ( s ) n o i t u l o s l c a n torage: 40c, 93% rel. humidity storage duration: 22 h per cycle number of cycles: 3 table 10: temperature specifications, valid for air pressure of 800...1200 hpa (800...1200 mbar) 9 - d r a d n a t s e r u t a r e p m e t characteristics conditions min max unit t a ambient temperature op erating, no airflow C40 71 c t c 5 0 1 0 4 C e r u t a r e p m e t e s a c t s storage temperature non operational C55 105 table 11: mtbf values at specified type ground benign ground fixed ground mobile case temperature 40c 40c 70c 50c mtbf 48 ims 25-05-9g 740'000 247'000 126'800 200'000 mil-hdbk 217f 48 ims 25-12-9 830'000 301'000 159'000 247'500 mar 04, 2002 revised to apr 17, 2006 page 8 of 11 www.power-one.com ims 25 25-watt dc-dc converter data sheet
mechanical data dimensions in mm. tolerances 0.3 mm unless otherwise indicated. fig. 11 case ims 25 weight: 42 g european projection 54.7 48.06 54.9 1 48.26 4 s m3 09115 45.72 10.16 5.08 2 4 3 13 17 15 t c 10.5 3.8 50.8 41.2 1 09124 45.72 10.16 5.08 2 4 3 13 17 15 5.8 8.2 fig. 12 case ims 25, open frame (option z) weight: 26 g ims 25 25-watt dc-dc converter data sheet mar 04, 2002 revised to apr 17, 2006 page 9 of 11 www.power-one.com
safety and installation instructions installation instruction installation of the dc-dc converters must strictly follow the national safety regulations in compliance with the enclo- sure, mounting, creepage, clearance, casualty, markings and segregation requirements of the end-use application. connection to the system shall be made via a printed circuit board with hole diameters of 1.4 mm 0.1 mm for the pins. the units should be connected to a secondary circuit. check for hazardous voltages before altering any connec- tions. do not open the module. ensure that a unit failure (e.g. by an internal short-circuit) does not result in a hazardous conditions. see also: safety of operator accessible output circuit. input fuse to prevent excessive current flowing through the input sup- ply line in case of a short-circuit across the converter input an external fuse should be installed in a non earthed input supply line. we recommend a fast acting fuse f5a for 24 ims 25 types and f3.15a for 48 ims 25 types. standards and approvals all dc-dc converters are pending to be ul recognized according to ul 1950, ul recognized for canada to can/ csa c22.2 no. 950-95 and lga approved to iec/en 60950 standards. the units have been evaluated for: ? building in ? basic insulation input to output, based on their maximum input voltage ? the use in a pollution degree 2 environment ? connecting the input to a secondary circuit which is sub- ject to a maximum transient rating of 1500 v after approvals the dc-dc converters are subject to manu- facturing surveillance in accordance with the above men- tioned ul, csa, en and iso 9001 standards. isolation the electric strength test is performed as factory test in ac- cordance with iec/en 60950 and ul 1950 and should not be repeated in the field. power-one will not honour any guarantee claims resulting from electric strength field tests. table 12: electric strength test voltages characteristic input to output unit v k 1 . 1 h t g n e r t s c i r t c e l e rms test voltage 1 s 1.5 kv dc coupling capacitance 2.2 nf insulation resistance >100 m 7 at 500 v dc partial discharge consult k v extinction voltag e factory fig. 13 pin allocation protection degree the protection degree of the dc-dc converters is ip 40. cleaning agents in order to avoid possible damage, any penetration of cleaning fluids should be prevented, since the power sup- plies are not hermetically sealed (use option z). safety of operator accessible output circuit if the output circuit of a dc-dc converter is operator acces- sible, it shall be an selv circuit according to iec/en 60950 related safety standards the following table shows some possible installation con- figurations, compliance with which causes the output circuit of the dc-dc converter to be an selv circuit according to iec/en 60950 up to a configured output voltage of 42 v. however, it is the sole responsibility of the installer to en- sure the compliance with the relevant and applicable safety regulations. more information is given in: technical infor- mation: safety . 1 2 4 3 13 17 15 09116 table 13: pin allocation pin no. single output single output option i 1vi+vi+ 2viCviC 3ww 4sdi 13 vo+ vo+ 15 voC voC 17 trim trim ims 25 25-watt dc-dc converter data sheet mar 04, 2002 revised to apr 17, 2006 page 10 of 11 www.power-one.com
ac-dc front end dc-dc con- verter mains fuse battery earth connection suppressor diode sel v earth connection + C ~ ~ 10004 fig. 14 schematic safety concept. use fuse, suppressor diode and earth connection as per table: safety concept leading to an selv output circuit . table 14: insulation concept leading to an selv output circuit conditions fr t l u s e r r e t r e v n o c c d - c d d n e t n o supply minimum required grade maximum minimum required safety measures to achieve the safety status of voltage of isolation, to be provided dc output status of the front end specified safety status of the the dc-dc by the ac-dc front end, voltage output circuit output circuit converter output t i u c r i c e h t m o r f d e i l p p u s s n i a m g n i d u l c n i battery charger front end 1 mains basic -60 v earthed selv circuit 2 operational insulation (pro- selv circuit ) r e t r e v n o c c d - c d e h t y b d e d i v c a v 0 5 2 - elv circuit input fuse 3 output suppressor earthed selv >60 v hazardous voltage diode(s) 4 , and earthed circuit secondary circuit output circuit(s) 2 double or reinforced -60 v selv circuit operational insulation (pro- selv circuit vided by the dc-dc converter) >60 v tnv-2 circuit supplementary insulation, double or reinforced insu- based on the maximum input lated unearthed hazardous voltage (provided by the voltage secondary circuit 5 dc-dc converter) 1 the front end output voltage should match the specified input voltage range of the dc-dc converter. 2 the earth connection has to be provided by the installer according to the relevant safety standard, e.g. iec/en 60950. 3 the installer shall provide an approved fuse (type with the lowest rating suitable for the application) in a non-earthed input line directly at the input of the dc-dc converter (see fig.: schematic safety concept ). for uls purpose, the fuse needs to be ul-listed. see also: input fuse . 4 each suppressor diode should be dimensioned in such a way, that in the case of an insulation fault the diode is able to limit the output voltage to selv (<60 v) until the input fuse blows (see fig.: schematic safety concept ). 5 has to be insulated from earth by basic insulation according to the relevant safety standard, based on the maximum output voltage from the front end. description of option option i inhibit excluces shut down the output(s) of the converter may be enabled or disabled by means of a logic signal (ttl, cmos, etc.) applied to the inhibit pin. no output voltage overshoot will occur when the unit is turned on. if the inhibit function is not required the inhibit pin should be connected to viC to enable the output (active low logic, fail safe). converter operating: C10 v...0.8 v converter inhibited or inhibit pin left open circuit 2.4...5 v fig. 15 if the inhibit is not used the inhibit pin should be con- nected to viC vi+ vi C i 06070 nuclear and medical applications - power-one products are not designed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of power-one, inc. technical revisions - the appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. specifications are subject to change without notice. mar 04, 2002 revised to apr 17, 2006 page 11 of 11 www.power-one.com

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