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pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 1 of 15 input voltage up to 60 vdc single output of 5.1 to 24 vdc no input to output isolation ? high efficiency up to 94% wide input voltage range ? low input-to-output differential voltage very good dynamic properties input undervoltage lock-out active current sharing for parallel operation output voltage adjustment, inhibit and sense lines fast dynamic response continuous no-load and short-circuit proof no derating table of contents page summary .......................................................................... 1 type survey and key data .............................................. 2 type key and product marking ........................................ 2 functional description ..................................................... 3 electrical input data ......................................................... 3 electrical output data ...................................................... 4 auxiliary functions ........................................................... 6 page electromagnetic compatibility (emc) .............................. 8 immunity to environmental conditions ............................ 8 mechanical data .............................................................. 9 safety and installation instructions ................................ 11 description of options ................................................... 13 accessorie s ................................................................... 14 ec-declaration of conformity ......................................... 15 summary the pss/psk series of positive switching regulators is de- signed as power supply modules for electronic systems. their major advantages include a high level of efficiency that remains virtually constant over the entire input range, high reliability, low ripple and excellent dynamic response. modules with input voltages up to 60 v are specially desig- ned for secondary switched and battery-driven applica- tions. the standard case design with heat sink allows op- eration at nominal load up to 50c without additional cool- ing, suitable for 19" rack or chassis mounting. replacing the heat sink by an optional cooling plate b or b1, allows chassis or wall mounting on top of a metal surface, acting as heat sink. connector type: h15 (according to din 41612). safety according to iec/en 60950, ul 1950 168 6.6" 80 3.2" 16 te 111 4.4" 3 u 168 6.6" 60 2.4" 12 te 111 4.4" 3 u
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 2 of 15 model selection and key data table 1: type survey output output input input e fficiency type o ptions voltage current voltage range voltage at v i nom , i o nom designation v o nom [v] i o nom [a] v i [v] 1 v i nom [v] h h h h h min [%] 5.1 14 8...40 20 83 pss 5a14-2 b 5.1 18 8...40 20 82 psk 5a18-2 b1 12 14 15...40 30 90 pss 1214-2 12 18 15...40 30 90 psk 1218-2 15 14 19...40 30 90 pss 1214-2 15 18 19...40 30 90 psk 1218-2 24 14 29...60 40 94 pss 2414-2 24 18 29...60 40 94 psk 2418-2 1 see also: electrical input data: d v io min . part number description and product marking type key psk 12 18 -2 b positive switching regulator in case s01, k01 - pss, psk nominal output voltage in volt (5a for 5.1 v) ......... 5a,...24 nominal output current in ampere .......................... 14, 18 operational ambient temperature range ?10 to 50c ... -2 options: cooling plate large / small .................. b / b1 example: psk 1218-2b = a positive switching regulator with a 12 v, 18 a output, ambient temperature range of ?10 to 50c and large cooling plate option b. note: all units features the following auxiliary functions which are not shown in the type designation: input filter, inhibit, r control, sense lines and current sharing. produkt marking basic type designation, applicable safety approvals and recognition marks, warnings, pin allocation, power-one patents and company logo. specific type designation, input voltage range, nominal output voltage and current, protection degree, batch no., serial no. and data code including production site, modification status and date of production.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 3 of 15 electrical input data general conditions: t a = 25c, unless t c is specified table 2: input data input pss 5a14 pss 1214 pss 1214 1 pss 2414 psk 5a18 psk 1218 psk 1218 1 psk 2418 characteristics conditions min typ max min typ max min typ max min typ max unit v i operating input voltage i o = 0 ? i o nom 8 40154019402960vdc d v io min min. diff. voltage v i ? v o t c min ? t c max 2.9345 v i o undervoltage lock-out 7.3 7.3 7.3 12 i i 0 no load input current i o = 0, v i min ? v i max 50 50 50 50 ma u i rfi input rfi level, en 55011/22 v i nom , i o nom aaaadb ( v) 0.15...30 mhz 1 output set to 15 v at r control input, see: auxiliary functions . control circuit go? vo+ gi? vi+ r i i o v o i i v i 03020 input filter s+ cs s? 30 32 26 28 24 4 6 20 22 14 16 18 8 10 fig. 1 block diagram functional description the switching regulators are designed using the buck con- verter topology. the input is not electrically isolated from the output. during the on period of the switching transistor, current is transferred to the output and energy is stored in the output choke. during the off period, this energy forces the current to continue flowing through the output chocke to the load and back through the freewheeling diode. regulation is accomplished by varying on/off duty cycle. these regulators are ideal for a wide range of applications, where input to output isolation is not necessary, or where already provided by an external front end (e.g. a transformer with rectifier). to optimise customer?s needs, additional options and accessories are available. input filter and fuse an input filter and a fuse are incorporated in all modules as standard. the filter reduces emitted electrical noise and prevents oscillations caused by the negative input imped- ance characteristic of a switched mode regulator. the input fuse protects against severe defects. the maximum permissible additionally superimposed rip- ple v i of the input voltage (rectifier mode) at a specified in- put frequency f i has the following values: v i max = 10 v pp at 100 hz, or v pp = 1000 hz/ f i 1 v inrush current the inrush current can reach very high values depending on the source and input line conditions. the inrush current into a switching regulator is limited by parasitic components of the voltage source and power supply input only. this in- put presents a very low impedance to such currents and when driven from a low impedance source, e.g. a battery, the inrush current can peak at several orders of magnitude above the continuous dc input current. to protect series el- ements such as switches or circuit brakers and rectifiers the use of additional external current limitation device is recom- mended.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 4 of 15 electrical output data general conditions: ? t a = 25c, unless t c is specified ? with r control output voltage v o = v o nom at i o nom ? sense lines connected at female connector table 3a: output data pss output pss 5a14 pss 1214 pss 1214 1 pss 2414 characteristics conditions min typ max min typ max min typ max min typ max unit v o output voltage v i nom , i o nom 5.05 5.15 11.60 12.40 14.50 15.50 23.30 24.70 v i o output current 2 v i min ? v i max 0 14.0 0 14.0 0 14.0 0 14.0 a i ol output current limitation t c min ? t c max 14.0 17.5 14.0 17.5 14.0 17.5 14.0 17.5 response v o output switching freq. v i nom , i o nom 55 150 200 300 mv pp voltage total iec/en 61204 3 60 160 210 310 noise bw = 20 mhz d v o u static line regulation v i min ? v i max , i o nom 100 240 300 480 mv d v o l static load regulation v i nom , i o = 0 ? i o nom 100 120 150 240 v o d dynamic volt age deviat. v i nom 150 360 450 700 t d load recovery time i o nom ? 1 / 3 i o nom 40 60 60 60 s regulation iec/en 61204 a uo temperature coefficient v i min ? v i max 1 2 3 5 mv/k d v o / d t c ( t c min ? t c max ) i o = 0 ? i o nom 0.02 0.02 0.02 0.02 %/k table 3b: output data psk output psk 5a18 psk 1218 psk 1218 1 psk 2418 characteristics conditions min typ max min typ max min typ max min typ max unit v o output voltage v i nom , i o nom 5.05 5.15 11.60 12.40 14.50 15.50 23.30 24.70 v i o output current 2 v i min ? v i max 0 18.0 0 18.0 0 18.0 0 18.0 a i ol output current limitation t c min ? t c max 18.0 22.5 18.0 22.5 18.0 22.5 18.0 22.5 response v o output switching freq. v i nom , i o nom 55 150 200 300 mv pp voltage total iec/en 61204 3 60 160 210 310 noise bw = 20 mhz d v o u static line regulation v i min ? v i max , i o nom 100 240 300 480 mv d v o l static load regulation v i nom , i o = 0 ? i o nom 100 120 150 240 v o d dynamic volt age deviat. v i nom 150 360 450 700 t d load recovery time i o nom ? 1 / 3 i o nom 40 60 60 60 s regulation iec/en 61204 a uo temperature coefficient v i min ? v i max 1 2 3 5 mv/k d v o / d t c ( t c min ? t c max ) i o = 0 ? i o nom 0.02 0.02 0.02 0.02 %/k 1 output set to 15 v at r control input, see: auxiliary functions. 2 see also: thermal considerations.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 5 of 15 thermal considerations when a switching regulator is located in free, quasi-station- ary air (convection cooling) at a temperature t a = 50c and is operated at its nominal output current i o nom , the case temperature t c will be about 80c after the warm-up phase, measured at the measuring point of case tempera- ture t c (see: mechanical data ). under practical operating conditions, the ambient tem- perature t a may exceed 50c, provided additional meas- ures (heat sink, fan, etc.) are taken to ensure that the case temperature t c does not exceed its maximum value of 80c. example: sufficient forced cooling allows t a max = 65c. a simple check of the case temperature t c ( t c 80c) at full load ensures correct operation of the system. 1.2 1.0 0.8 0.6 0.4 0 0.2 0.4 1.0 1.2 0.2 0.6 0.8 1.4 v o / v o nom i o / i o nom i o no m i o l 05038 fig. 4 overload, short-circuit behaviour v o versus i o . 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 40 60 70 80 i o / i o nom t a [ c ] 0.9 1.0 forced cooling 05032 t c max 50 convection cooling t a min overtemperature protection the unit is self-protecting by an internal temperature moni- tor, which inhibits the output above t c max . the output is au- tomatically enabled again after temperature has dropped below t c max . output protection a voltage suppressor diode which in worst case conditions fails into a short circuit, protects the output against an inter- nally generated overvoltage. such an overvoltage could oc- cur due to a failure of either the control circuit or the switch- ing transistor. the output protection is not designed to with- stand externally applied overvoltages. the user should en- sure that systems with power-one power supplies, in the event of a failure, do not result in an unsafe condition (fail- safe). parallel and series connection outputs of equal nominal voltage can be parallel-con- nected. use the current sharing feature (cs) for even distri- bution of the output current. see also: auxiliary functions. outputs can be series-connected with any other module. in series-connection the maximum output current is limited by the lowest current limitation. electrically isolated source voltages are needed for each module! short circuit behaviour a constant current limitation circuit holds the output current almost constant whenever an overload or a short circuit is applied to the regulator's output. it acts self-protecting and recovers ? in contrary to the fold back method ? automati- cally after removal of the overload or short circuit condition. fig. 3 output current derating versus temperature. fig. 2 dynamic load regulation. i o / i o nom 1 v od v od t d t d d v o i d v o i t v o 0 t 10 s 10 s 05010
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 6 of 15 table 5: inhibit characteristics characteristics conditions min typ max unit v inh inhibit input voltage to keep v o = on v i min ? v i max ?50 +0.8 vdc regulator output voltage... v o = off t c min ? t c max +2.4 +50 t r switch-on time after inhibit command v i = v i nom 100 ms t f switch-off time after inhibit command r l = v o nom / i o nom 5 i i inh input current when inhibited v i = v i nom 25 ma 0 t t 0 inhibit 1 0.1 1 v o / v o nom t r t f 06001 fig. 8 output response as a function of inhibit signal i inhibit (remote on / off) note: with open i input, output is enabled ( v o = on) the inhibit input allows the switching regulator output to be disabled via a control signal. in systems with several units, this feature can be used, for example, to control the activa- tion sequence of the regulators by a logic signal (ttl, c- mos, etc.). an output voltage overshoot will not occur when switching on or off. the inhibit characteristics are refer- enced to the s? remote sense terminal. vi+ gi? s? i s+ i inh v inh 06047 fig. 7 definition of i inh and v inh fig. 6 typical inhibit current i inh versus inhibit voltage v inh 4 2 0 ?50 ?40 20 40 ?30 0 ?20 ?10 10 30 50 5 3 1 i inh [ma] v inh [v] v o on v o off v inh = 0.8 v v inh = 2.4 v 06034 auxiliary functions s sense lines note: sense lines should always be connected! it is rec- ommended to connect the sense lines directly at the female connector. see also: technical information. this feature enables compensation of voltage drop across the connector contacts and the load lines. in case the sense lines are connected at the load rather than directly at the connector, the user must ensure that v o max (between vo+ and go? set at r control input) is not exceeded. applying generously dimensioned cross-section load leads avoids troublesome voltage drop. to minimize noise pick-up wire sense lines in parallel or twisted. to ensure correct operation, both sense lines must be con- nected to their respective power output potential. the volt- age difference between any sense line and its respective power output pin (as measured on the connector) should not exceed the values given in the following table. table 4: maximum allowed voltage compensation nominal output total voltage difference voltage difference voltage between both sense lines between and their respective output go? and s? 5.1 v <0.5 v <0.25 v 12, 15, 24 v <1.0 v <0.25 v fig. 5 sense lines connection vi+ i r cs gi? vo+ s+ s? go? load 06046
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 7 of 15 r control for output voltage adjustment note: with open r input, v o v o nom . the output voltage v o can either be adjusted with an exter- nal reference voltage ( v ext ) or with an external resistor ( r 1 or r 2 ). the adjustment range is 0 - v o max . the minimum dif- ferential voltage d v io min between input and output (see: electrical input data ) should be maintained. undervoltage lock-out = minimum input voltage. s+ r + 4000 ? v ref v ext ? + s? 06048 s+ r ? + 4000 ? u ref r 1 r 2 s? 06049 fig. 9 voltage adjustment with v ext between r and s? a) v o = 0 - v o max , using v ext between r and s?: v o v ext v ext 2.5 v ????? v o v o nom ????? v o nom 2.5 v fig. 10 voltage adjustment with external resistor r 1 or r 2 b) v o = 0 - 100% v o nom , using r 1 between r and s?: 4000 ? v o v o nom r 1 r 1 ??????????? v o ??????????? v o nom ? v o r 1 + 4000 ? c) v o = v o nom - v o max , using r 2 between r and s+: 4000 ? v o ( v o nom ? 2.5 v) r 2 ???????????????????????? 2.5 v ( v o ? v o nom ) v o nom 2.5 v r 2 v o ???????????????????????????????? 2.5 v ( r 2 + 4000 ? ) ? v o nom 4000 ? caution: to prevent damage v ext should not exceed 20 v, nor be negative, and r 2 should never be less than 47 k ? . table 6: maximum adjustable output voltage pss 5a14 pss 1214 pss 2414 psk 5a18 psk 1218 psk 2418 characteristics conditions min typ max min typ max min typ max unit v o max maximum adjustable v i nom , i o nom 5.6 16.0 26.0 v output at r control input cs current sharing for parallel operation of several modules, interconnecting all cs pins ensures that the output currents are evenly dis- tributed. this feature improves transient load performance and increases system reliability. all paralleled units should be supplied by equal input voltage ( v i ) and interconnecting leads should have equal length and cross section to ensure equal voltage drop.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 8 of 15 immunity to environmental conditions table 8: mechanical stress test method standard t est conditions status ca damp heat iec/din iec 60068-2-3 temper ature: 40 2 c unit not steady state mil-std-810d section 507.2 relative humidity: 93 +2/-3 % operating duration: 21 days ea shock iec/en/din en 60068-2-27 acceleration amplitude: 15 g n = 147 m/s 2 unit (half-sinusoidal) mil-std-810d section 516.3 bump duration: 11 ms operating number of bumps: 18 (3 each direction) eb bump iec/en/din en 60068-2-29 acceleration amplitude: 10 g n = 392 m/s 2 unit (half-sinusoidal) mil-std-810d section 516.3 bump duration: 16 ms operating number of bumps: 6000 (1000 each direction) f c vibration iec/en/din en 60068-2-6 acceleration amplitude: 0.15 mm (10 - 60 hz) unit (sinusoidal) mi l-std-810d section 514.3 2 g n = 20 m/s 2 (60 - 150 hz) operating frequency (1 oct/min): 10 - 150 hz test duration: 3.75 h (1.25 h each axis) electromagnetic compatibility (emc) electromagnetic immunity general condition: case not earthed. table 7: immunity type tests phenomenon s tandard 1 class coupling value waveform source test in per- level mode 2 applied im ped. procedure oper. form. 3 electrostatic iec/en 3 contact discharge 6000 v p 1/50 ns 330 ? 10 positive and yes a discharge 61000-4-2 to case 10 negative discharges electromagnetic iec/en 2 antenna 3 v/m am 80% 80 - 1000 mhz yes a field 61000-4-3 1 khz electrical fast iec/en 2 i/c, +i/?i 1000 v p bursts of 5/50 ns 50 ? 60 s positive yes a transient/burst 61000-4-4 3 2000 v p 5 khz rep. rate 60 s negative b transients with bursts per 15 ms burst coupling mode duration and a 300 ms period surge iec/en 2 i/c 1000 v p 1.2/50 s 12 ? 5 pos. and 5 neg. yes a 61000-4-5 +i/?i 500 v p 2 ? surges per coupling mode conducted iec/en 2 i, o, si gnal wires 3 vac am 80% 150 ? 0.15 - 80 mhz yes a disturbances 61000-4-6 ( 130 db v) 1 khz 1 for related and previous standards see: technical information: safety & emc . 2 i = input, o = output, c = case. 3 a = normal operation, no deviation from specifications, b = normal operation, temporary deviation from specs possible. for emission levels refer to electrical input data.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 9 of 15 table 9: temperature specifications, valid for an air pressure of 800...1200 hpa (800...1200 mbar) temperature standard characteristics conditions min max unit t a ambient temperature operational 1 ?10 50 c t c case temperature ?10 80 t s storage temperature non operational ?25 85 1 see: thermal considerations and: overtemperature protection. table 10: mtbf mtbf ground benign mtbf acc. to mil-hdbk-217f t c = 40c 335'000 h mechanical data the converters are designed to be inserted into a rack according to iec 60297-3. 111 0.5 168.5 0.5 60 3.27 7 te 5 te 25.9 front plate main face back plate 171.9 (din 41494) 50 11.8 76 50.5 measuring point of case temperature t c 4 x m4 09025 8 5 103 30.3 27.38 fig. 11 case s01, weight 1.3 kg aluminium, fully enclosed, black finish and self cooling. european projection
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 10 of 15 european projection 159 4.5 89 168.5 d 80 6.5 3.27 7 te 9 te 25.9 front plate main face back plate measuring point of case temperature t c 171.93 (din 41494) 50 11.8 0902 6 30.3 111 0.5 103 27.38 fig. 12 case k01, weight 1.6 kg aluminium, fully enclosed,black finish and self cooling. note: ?d 15 mm, recommended minimum dis- tance to next part to ensure proper air cir- culation at full output power. ? free air locations: the module should be mounted with fins in vertical position to achieve a maximum air flow through heat sink. mechanical data the converters are designed to be inserted into a rack according to iec 60297-3.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 11 of 15 standards and approvals all switching regulators are ul recognized according to ul 60950, can/csa c22.2 no. 234-m90 and iec/en 60950. the units have been evaluated for: building in operational insulation from input to output and input/out- put to case 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 500 v the switching regulators are subject to manufacturing sur- veillance in accordance with the above mentioned ul, csa and iso 9001 standards. installation instruction installation of the switching regulators 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. check for hazardous voltages before altering any connections. the input and the output circuit are not separated. i.e. the negative path is internally interconnected! the units should be connected to a secondary circuit. do not open any module. ensure that a unit failure (e.g. by an internal short-circuit) does not result in a hazardous condition. see also: safety of operator accessible output circuit. note: additional information on input circuitry, grounding and parallel operation of units is given in: technical infor- mation: application notes. protection degree the protection degree is ip 30. it applies only if the module is plugged-in or the female connector is properly attached to the module. isolation electric strength test voltage between input interconnected with output and case: 500 vdc, 1 s. this test is performed in the factory as routine test in accordance with iec/en 60950 and ul 60950 and should not be repeated in the field. power-one will not honour any guarantee claims resulting from electric strength field tests. table 11: h15 connector pin allocation electrical determination type h15 pin no. ident. output voltage (positive) 4 vo+ output voltage (positive) 6 vo+ output voltage (negative) 8 go? output voltage (negative) 10 go? not connected 12 n.c. inhibit input 14 i r-input (output voltage programming) 16 r sense line (negative) 18 s? sense line (positive) 20 s+ current sharing control input 22 cs protective ground (leading pin) 24 input voltage (negative) 26 gi? input voltage (negative) 28 gi? input voltage (positive) 30 vi+ input voltage (positive) 32 vi+ 4 32 10008 fixtures for connector retension clips v (see accessories ) safety and installation instructions connector pin allocation the connector pin allocation table defines the electrical potentials and the physical pin position on the connector. pin 24 (protective earth) is the leading pin, which provides electrical contact first. the modules should only be wired via the female connector h15 (according to din 41612) to ensure requested safety! fig. 13 view of male h15 connector
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 12 of 15 table 12: insulation concept leading to an selv output circuit conditions front end switching r egulator result 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 switching by the ac-dc front end, voltage output circuit output circuit regulator output including mains supplied from the circuit battery charger front end 1 battery double or reinforced 60 v selv circuit none selv circuit supply, considered as secon- dary circuit mains basic 60 v earthed selv circuit 2 none eart hed selv 250 v ac elv circuit input fuse 3 and earthed output circuit circuit 2 and earthed 2 or non user accessible case double or reinforced 60 v selv circuit none selv circuit 1 the front end output voltage should match the specified input voltage range of the switching regulator. 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 (slow blow type with the lowest current rating suitable for the application, max. 12.5 a) in a non-earthed input conductor directly at the input of the switching regulator. if vo+ is earthed, insert the fuse in the gi- l ine. for ul?s purpose, the fuse needs to be ul-listed. safety of operator accessible output circuit if the output circuit of a switching regulator is operator ac- cessible, 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 switching regulator to be an selv circuit according to iec/en 60950 up to a configured nominal output voltage of 30 v. however, it is the sole responsibility of the installer or user to assure the compliance with the relevant and applicable safety regulations. more information is given in: technical information: safety.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 13 of 15 description of options b, b1 cooling plate where a cooling surface is available, a cooling plate (option b, or option b1) can be used instead of the standard heatsink. the mounting system must ensure suf- ficient cooling capacity to guarantee that the maximum case temperature t c max is not exceeded. the required cooling capacity can be calculated by the following formula: 100% ? p loss = ???????- ( v o i o ) 6.5 11.2 13 140 17.3 133.4 0.2 30 168 5 47.2 38.5 127 6.5 11.8 11027 fig. 14 option b, large cooling plate weight: 1.2 kg fig. 15 option b1, small cooling plate weight: 1.2 kg 111 168 0.5 101 158 5 m 4 5 171.9 5 47.2 38.5 11.8 11028
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 14 of 15 accessories a variety of electrical and mechanical accessories are available including: ? front panels for 19" rack mounting, schroff and intermas systems, 12 and 16 te. ? mating h15 connectors with screw, solder fast-on or press-fit terminals. ? connector retention facilities (v-clips). ? din-rail mounting adaptor. for more detailed information please refer to: accessory products.
pss, psk extended data sheet positive switching regulators (benign) rev. feb 15, 2004 page 15 of 15 ec declaration of conformity we power-one ag ackerstrasse 56 ch-8610 uster declare under our sole responsibility that all psx series switching regulators carrying the ce-mark are in conformity with the provisions of the low voltage directive (lvd) 73/23/ eec of the european communities. conformity with the directive is presumed by conformity wih the following harmonized standards: ? en 61204: 1995 (= iec 61204: 1993, modified) low-voltage power supply devices, d.c. output - perfomance characteristics and safety requirements ? en 60950: 1992 + a1: 1993 + a2 (= iec 950 second edition 1991 + a1: 1992 + a2: 1993) safety of information technology equipment the installation instructions given in the corresponding data sheet describe correct installation leading to the presumption of conformity of the end product with the lvd. all psx series switching regulators are components, intended exclusively for inclusion within other equipment by an industrial assembly operation or by professional installers. they must not be operated as stand alone products. hence conformity with the electromagnetic compatibility directive 89/336/eec (emc directive) needs not to be declared. nevertheless, guidance is provided in most product application notes on how conformity of the end product with the indicated emc standards under the responsibility of the installer can be achieved, from which conformity with the emc directive can be presumed. uster, 1 sep. 2003 power-one ag rolf baldauf johann milavec director engineering director projects and ip

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