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psl-family switching regulators 19" rugged environment 5 - 2 edition 2/96 - ? melcher ag melcher the power partners. 5.1 psr: positive switching regulators psl-family no input to output isolation single output of 12, 15, 24, 36 or 48 v dc/72...288 w input voltage up to 144 v dc ? high efficiency up to 96% ? extremely wide input voltage range ? very good dynamic properties ? input undervoltage cut-out ? external output voltage adjustment and inhibit ? two temperature ranges ? continuous no-load and short-circuit proof ? no derating safety according to iec 950 c table of contents page type survey ................................................................ 5 - 2 description .................................................................. 5 - 2 safety and installation instructions ............................. 5 - 3 immunity to environmental conditions ........................ 5 - 4 electromagnetic compatibility emc ............................ 5 - 5 electrical input and output data ................................. 5 - 6 characteristics and definitions .................................... 5 - 8 standard features ...................................................... 5 - 9 description of options ................................................. 5 - 9 mechanical data ....................................................... 5 - 11 type key and product marking ................................. 5 - 12 type survey table 1: type survey nominal nominal input nominal efficiency type options output output voltage input designation voltage current range voltage u o nom i o nom u i 1 u i nom h 12 v 6 a 18...144 v 60 v 89 % psl 126-7r -9, l, i, p, c, d, a 15 v 22...144 v 90 % psl 156-7r 24 v 31...144 v 94 % psl 246-7r 36 v 44...144 v 80 v 95 % psl 366-7r 48 v 58...144 v 96 % psl 486-7r 1 surges up to 156 v for 2 sec. see data d u io min (min. differential voltage u i C u o ) description the psl family of positive swiching regulators is designed as power supply modules for electronic systems. their ma- jor advantages include a high level of efficiency that re- mains virtually constant over the entire input range, high reliability, low ripple and excellent dynamic response. modules with input up to 144 v are specially designed for battery driven mobile applications. case l04: aluminium, black finish and self cooling. external input circuitry an external capacitor (see "application notes") is required in rectifier mode and in dc operation mode only, if the sum of the lengths of the two input lines between source and in- put (without option l) is greater than approx. 5 m. for long connection lines the use of option l is recommended in or- der to reduce superimposed interference voltages or cur- rents and to prevent oscillation.
rugged environment switching regulators 19" psl-family edition 2/96 - ? melcher ag 5 - 3 melcher the power partners. 5.1 control circuit p (option) go vo+ gi vi+ input filter l (option) r/i i o u o i i u i c e c (option) d (option) + a (option) fig. 1 block diagram note: check for hazardous voltages before altering any connections. do not open the module. the input and the output circuitry are not separated, i.e. the nega- tive path is internally interconnected! safety and installation instructions safety if the output circuit of a switching regulator is operator-ac- cessible according to the iec 950 related safety standards, it shall be an selv circuit (safety extra low voltage circuit, i.e. a circuit, separated from mains by at least basic insula- tion, that is so designed and protected that under normal and single fault conditions, the voltage between any two conductors and between any conductor and earth does not exceed 60 v dc). in the following section an interpretation is provided of the iec 950 safety standard with respect to the safety status of the output circuit. however, it is the sole responsibility of the installer or user to assure the compliance with the relevant and applicable safety standards. if the following table is observed, the output of any switch- ing regulator is considered to be an selv circuit up to a nominal output voltage of 36 v, or up to 48 v if option c is fitted. table 2: insulation concept for selv circuits nominal minimum required grade maximum minimum required measures to achieve the resulting safety mains of isolation, to be output safety status of the specified safety status status of the supply provided by the ac-dc voltage front end output circuit of the output circuit switching voltage front end, including mains from the regulator output (ac) supplied battery charger front end circuit none battery supply completely 60 v selv battery circuit none selv circuit separated from mains 144 v hazardous voltage battery input fuse 1 and unearthed, selv circuit circuit 2 non operator-accessible case 2 hazardous voltage battery input fuse 1 and earthed output earthed selv circuit circuit 3 and earthed 3 or non circuit operator-accessible case 250 v basic 60 v earthed selv circuit earthed input circuit 3 selv circuit elv circuit input fuse 1 and earthed selv earthed output circuit 3 circuit 144 v hazardous voltage input fuse 1 and earthed output earthed selv secondary circuit circuit 3 and earthed 3 or non circuit operator-accessible case double or reinforced 60 v selv circuit none selv circuit 144 v double or reinforced insu- input fuse 1 and unearthed and selv circuit lated unearthed hazardous non operator-accessible case 2 voltage secondary circuit 2 1 the installer shall provide an approved fuse (slow blow type with lowest rating suitable for the application, max. 12.5 a) in the positive or negative input conductor directly at the input of the switching regulator. for ul's purpose, the fuse needs to be ul-listed. if option c is fitted, a suitable fuse is built-in. 2 has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maximum in- put voltage of the switching regulator (contrary to case marking: "this apparatus must be earthed."). 3 the earth connection has to be provided by the installer according to the relevant safety standards, e.g. iec 950.
psl-family switching regulators 19" rugged environment 5 - 4 edition 2/96 - ? melcher ag melcher the power partners. 5.1 standards and approvals all melcher power supplies are subject to manufacturing surveillance in accordance with iso 9001 standards. all units are ul recognized as per ul 1950, ul 1012 and can/csa c22.2 no. 234-m90. protection degree the protection degree is defined by ip 30 (equipped with any potentiometer adjustable option: ip 20). the protection degree applies only if the module is plugged-in or the fe- male connector is properly attached to the module. installation instructions the connector pin allocation table defines the electrical potentials and the physical pin position on the connector. pin no. 32 is the protective ground pin and is protruding, i.e. attaching the female connector, this pin provides electrical contact first. the modules should only be wired via the fe- male connector h11 (according to din 41612) to ensure re- quested safety! 2 5 8 11 14 17 20 23 26 29 32 fig. 2 view of male h11 connector table 3: h11 connector pin allocation and designation electrical determination type h11 pin no. design. r-input (or inhibit input) 1 2 r (i) undervoltage monitor (option d) 5 d output voltage (negative) 8 goC output voltage (negative) 11 goC output voltage(positive) 14 vo+ output voltage (positive) 17 vo+ input voltage (negative) 20 giC input voltage (negative) 23 giC input voltage (positive) 26 vi+ input voltage (positive) 29 vi+ protective ground (protruding pin) 32 1 r-input (output voltage programming) not available with option p (potentiometer) or option i (inhibit) table 5: temperature specifications temperature standard -7 option -9 characteristics conditions min max min max unit t a ambient temperature u i min ... u i max C25 71 C40 71 c t c case temperature i o = 0... i o nom C25 95 C40 95 t s storage temperature not operational C40 100 C55 100 immunity to environmental conditions table 4: mechanical stress test method standard test conditions status ca damp heat din 40046 part temperature: 40 2 c unit not steady state iec 68-2-3 relative humidity: 93 +2/-3 % operating mil-std-810d section 507.2 duration: 56 days ea shock din 40046 part 7 acceleration amplitude: 100 g n = 981 m/s 2 unit (half-sinusoidal) iec 68-2-27 bump duration: 6 ms operating mil-std-810d section 516.3 number of bumps: 18 (3 each direction) eb continuous shock din 40046 part 26 acceleration amplitude: 40 g n = 392 m/s 2 unit (half-sinusoidal) iec 68-2-29 bump duration: 6 ms operating mil-std-810d section 516.3 number of bumps: 6000 (1000 each direction) fc vibration din 40046 part 8 frequency (1 oct/min): 10...2000 hz unit (sinusoidal) iec 68-2-6 max. vibration amplitude: 0.35 mm (10...60 hz) operating mil-std-810d section 514.3 acceleration amplitude: 5 g n = 49 m/s 2 (60...2000 hz) test duration: 7.5 h (2.5 h each axis) fda random vibration din 40046 part 23 acceleration spectral density: 0.05 g 2 /hz unit not wide band iec 68-2-35 frequency band: 20...500 hz operating reproducibility high acceleration magnitude: 4.9 g rms test duration: 3 h (1 h each axis) kb salt mist din 40046 part 105 concentration: 5% (30 c) unit not cyclic iec 68-2-52 duration: 2 h per cycle operating (sodium chloride storage: 40 c, 93% rel. humidity nacl solution) storage duration: 22 h per cycle number of cycles: 3
rugged environment switching regulators 19" psl-family edition 2/96 - ? melcher ag 5 - 5 melcher the power partners. 5.1 table 6: mtbf and device hours mtbf ground fixed ground mobile device hours 1 mtbf acc. to mil-hdbk-217d t c = 40 c t c = 70 c t c = 40 c t c = 70 c 130'000 h 58'000 h 36'000 h 17'000 h 3'900'000 h 1 statistical values, based on an average of 4300 working hours per year and in general field use electromagnetic compatibility emc immunity general condition: case earthed. table 7: immunity type tests phenomenon standard class coupling value waveform source test in per- level mode 4 applied imped. procedure oper. form. impulse voltage iec 255-4 iii i/o, i/c, o/c 5000 v p 1.2/50 m s 500 w 3 pos. and 3 neg. no - app. e4 5 +i/Ci impulses per (1976) coupling mode high frequency iec 255-4 iii i/o, i/c, o/c 2500 v p 400 damped 200 w 2 s per yes 1 disturbance app. e5 5 +i/Ci 1000 v p 1 mhz waves/s coupling mode (1976) voltage surge iec 571-1 i/c, +i/Ci 800 v p 100 m s 100 w yes 2 (1990-07) 1500 v p 50 m s 1 pos. and 1 neg. voltage surge per coupling mode 3000 v p 5 m s 4000 v p 1 m s 7000 v p 100 ns electrostatic iec 801-2 4 contact discharge 8000 v p 1/50 ns 330 w 10 positive and yes 1 3 6 discharge (1991-04) to case 10 negative discharges electric field iec 801-3 3 antenna in 10 v/m sine wave mod- 261000 mhz yes 1 (1984) 1m distance ulated w. 1 khz fast transient/ iec 801-4 4 i/c, +i/Ci 4000 v p bursts of 5/50 ns 50 w 1 min positive yes 1 3 6 burst (1988) 5 khz rep. rate 1 min negative transients with bursts per 15 ms burst coupling mode duration and a 300 ms period transient iec 801-5 iii i/c 2000 v p 1.2/50 m s 12 w 5 pos. and 5 neg. yes 1 6 (draft 1993-01) +i/Ci 1000 v p 2 w impulses per coupling mode immunity to iec 801-6 3 i, o, signal wires 10 v rms 7 80% amplitude 50 w am 0.15...80 mhz yes 1 conducted modulated disturbancies with 1 khz 1 normal operation, no deviation from specifications 2 normal operation, temporary deviation from specs possible 3 with option c: manual reset 4 i = input, o = output, c = case 5 in correspondance with din 57435 part 303 and vde 0435 part 303 (1984-09) 6 option l neccessary 7 open circuit emission for emission levels refer to "electrical input and output data".
psl-family switching regulators 19" rugged environment 5 - 6 edition 2/96 - ? melcher ag melcher the power partners. 5.1 electrical input and output data general conditions C t a = 25 c, unless t c is specified. C with r or option p, output voltage u o = u o nom at i o nom table 8a: input and output data characteristics conditions psl 126 psl 156 psl 246 unit min typ max min typ max min typ max output u o nom output voltage u i nom , i o nom 11.92 12.07 14.91 15.09 23.85 24.14 v i o nom output current u i min ... u i max 6.0 6.0 6.0 a i ol output current t c min ... t c max 6.0 7.8 6.0 7.8 6.0 7.8 limitation response u o ripple at output u i nom 55 75 80 100 80 120 mv pp (bw = 20 mhz) i o nom d u o u static control deviation u i min ... u i max 25 40 25 40 80 100 mv versus input voltage u i i o nom d u o i static control deviation u i nom 30 50 30 50 60 100 versus output current i o i o = 0 i o nom u o d dynamic control u i nom 100 100 120 deviation 1 i o n om ? 1 / 3 i o nom t r dynamic load transient 60 60 80 m s time recovery 1 a uo temperature coefficient u i min ... u i max 2 3 5 mv/k d u o / d t c t c min ... t c max i o = 0... i o nom 0.02 0.02 0.02 %/k input u i input voltage 5 i o = 0... i o nom 18 144 22 144 31 144 v dc t c min ... t c max d u io min minimum differential 6 7 7 v voltage u i - u o 2 u i o undervoltage cut-out 12 15 19 i i 0 no load i o = 0 35 35 35 ma input current u i min ... u i max i i m peak value of u i nom 250 250 250 a inrush current 3 t i s rise time 3 555 m s t i r tail half value time 3 40 40 40 i i m peak value of u i nom 350 350 350 a inrush current 3 with option l t i s rise time 3 25 25 25 m s t i r tail half value time 3 125 125 125 u i rfi rfi level at input, 4 vde 0871 (6.78) b b b db 0.01...30 mhz u i min...max , i o nom ( m v) efficiency h efficiency u i nom , i o nom 89 90 94 % isolation u is isolation test voltage inputs/outputs 1500 1500 1500 v dc electronics to case interconnected 1 see "dynamic characteristics" 2 the minimum differential voltage d u io min between input and output increases linearly from 0 to 1 v at t a = 46 c and 71 c ( t c = 70 c and 95 c) 3 definitions according to vde 0433, part 3 4 with option l and additional external input capacitor c e = 470 m f/200 v, e.g. chemicon, kme-series or equivalent 5 surges up to 156 v for 2 sec. (complying to les-db standard for u n = 110 v)
rugged environment switching regulators 19" psl-family edition 2/96 - ? melcher ag 5 - 7 melcher the power partners. 5.1 table 8b: input and output data characteristics conditions psl 366 psl 486 unit min typ max min typ max output u o nom output voltage u i nom , i o nom 35.78 36.22 47.70 48.29 v i o nom output current u i min ... u i max 6.0 6.0 a i ol output current t c min ... t c max 6.0 7.8 6.0 7.8 limitation response u o ripple at output u i nom 80 150 100 200 mv pp (bw = 20 mhz) i o nom d u o u static control deviation u i min ... u i max 200 300 100 200 mv versus input voltage u i i o nom d u o i static control deviation u i nom 120 200 180 250 versus output current i o i o = 0 i o nom u o d dynamic control u i nom 140 150 deviation 1 i o n o m ? 1 / 3 i o nom t r dynamic load transient 100 100 m s time recovery 1 a uo temperature coefficient u i min ... u i max 8 10 mv/k d u o / d t c t c min ... t c max i o = 0... i o nom 0.02 0.02 %/k input u i input voltage 5 i o = 0... i o nom 44 144 58 144 v dc t c min ... t c max d u io min minimum differential 8 10 v voltage u i - u o 2 u i o undervoltage cut-out 29 40 i i 0 no load i o = 0 40 45 ma input current u i min ... u i max i i m peak value of u i nom 250 250 a inrush current 3 t i s rise time 3 55 m s t i r tail half value time 3 40 40 i i m peak value of u i nom 350 350 a inrush current 3 with option l t i s rise time 3 25 25 m s t i r tail half value time 3 125 125 u i rfi rfi level at input, 4 vde 0871 (6.78) b b db 0.01...30 mhz u i nom , i o nom ( m v) efficiency h efficiency u i min...max , i o nom 95 96 % isolation u is isolation test voltage inputs/outputs 1500 1500 v dc electronics to case interconnected 1 see "dynamic characteristics" 2 the minimum differential voltage d u io min between input and output increases linearly from 0 to 1 v at t a = 46 c and 71 c ( t c = 70 c and 95 c) 3 definitions according to vde 0433, part 3 4 with option l and additional external input capacitor c e = 470 m f/200 v, e.g. chemicon, kme-series or equivalent 5 surges up to 156 v for 2 sec. (complying to les-db standard for u n = 110 v)
psl-family switching regulators 19" rugged environment 5 - 8 edition 2/96 - ? melcher ag melcher the power partners. 5.1 characteristics and definitions output protection a voltage suppressor diode protects the output against an internally generated overvoltage, which could occur due to a failure of the control circuit, which in worst case condi- tions fails into a short circuit. the suppressor diode is not designed to withstand externally applied overvoltages. the user should ensure that systems with melcher power sup- plies, in the event of a failure, do not result in an unsafe condition (fail-safe). dynamic characteristics fig. 3 behaviour and characteristics under varying load condi- tions. temperature when a converter is located in free, quasi-stationary air at a temperature t a = 71 c and is operated at its nominal output power, the case temperature t c will be about 95 c after the warm-up phase measured at the measuring point of case temperature t c (see "mechanical data"). under practical operating conditions, the ambient tempera- ture t a may exceed 71 c, provided additional measures are taken to ensure that the case temperature t c does not exceed its maximum value of 95 c ( heat sink, fan, etc.). example: sufficient forced cooling allows t a max = 85 c. a simple check of the case temperature t c ( t c 95 c) at full load ensures correct operation of the system 0 10 20 30 40 50 60 70 80 ?0 50 60 70 80 90 100 p o [%] t a [ c] 90 100 110 t c max p o max (convection cooling) p o max (forced cooling) fig. 4 output power derating versus ambient temperature parallel and series connection outputs of equal nominal voltages can be parallel-con- nected. however, the use of a single unit with higher output power, because of its power dissipation, is always a better solution. in parallel-connected operation, one or several outputs may operate continuously at their current limit knee-point which will cause an increase of the case temperature. conse- quently, the max. ambient temperature value should be re- duced by 10 k. outputs can be series-connected with any other module. in series-connection the maximum output current is limited by the lowest current limitation. galvanically separated 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. 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 u o / u o nom i o / i o nom i o nom i o l fig. 5 overload, short-circuit behaviour u o versus i o i o / i o nom 3/3 2/3 1/3 0 t 3 10 s 3 10 s u od u od t r t r u o i u o i t u o
rugged environment switching regulators 19" psl-family edition 2/96 - ? melcher ag 5 - 9 melcher the power partners. 5.1 standard features r external output voltage adjustment note: with open r input, u o = u o nom . r-input together with option i or option p cannot be supported simultaneously. the output voltage u o can either be adjusted with an exter- nal resistor ( r 1 or r 2 ) or with an external voltage ( u ex ). the adjustment range is 01.08 of u o nom . the minimal differ- ential voltage d u io min between input and output should be maintained (see data). min. input = undervoltage cut-out. fig. 7 voltage adjustment with external resistor r 1 or r 2 [ w ] b) u o = 0...100 % u o nom , using r 1 between r and g (go-): r 1 4000 ? u o u o ? u o nom ? CCCCCCCC r 1 ? CCC-CCCC r 1 + 4000 u o nom C u o c) u o = u o nom ... u o max , using r 2 between r and vo+: u o max = u o nom + 8% r 2 u ref u o ? u ref ? CCCCCCCCCCCCCCCCCC k = CCCCCC k ? ( r 2 + 4000) C 4000 u o nom u o ? (1-k) r 2 ? 4000 ? CCCCCCCCC ( u ref = 2.5 v 4%) k ? u o C u ref vo + r + g 4000 w u ref r 1 r 2 go vo + r + 4000 w g u ref u ex + go fig. 6 voltage adjustment with u ex [v] between r and g (go-): u o nom a) u o ? u ex ? CCCCCC ( u ref = 2.5 v 4%) u ref caution: to prevent damage u ex should not exceed 2.7 v, nor be negative. all formulae give approximate values only. data table 9: inhibit characteristics characteristics conditions min typ max unit u inh inhibit input voltage to keep u o = on u i min ... u i max C50 +0.8 v dc regulator output voltage... u o = off t c min ... t c max +2.4 +50 t r switch-on time after inhibit command u i = u i nom 5ms t f switch-off time after inhibit command r l = u o nom / i o nom 10 i i off input current when inhibited i o = 0, u i = u i nom 10 ma vi+ gi go i vo+ i inh u inh fig. 8 definition of i inh and u inh fig. 10 inhibit current i inh versus inhibit voltage u inh 4 2 0 -50 -40 20 40 -30 0 -20 -10 10 30 50 5 3 1 i inh [ma] u inh [v] u o on u o off u inh = 0.8 v u inh = 2.4 v fig. 9 output response as a function of inhibit signal description of options option i inhibit note: with open i-input, output is enabled ( u o = on) inhibit excludes r function. the inhibit input allows the switching regulators to be disa- bled via a control signal. in systems with several units, this feature can be used, for example, to control the activation sequence of the regulators by a logic signal (ttl, c-mos, etc.). an output voltage overshoot will not occur when the units are switched on or off. 1 0.1 0 0 u o / u o nom u inh t r t f t t 1
psl-family switching regulators 19" rugged environment 5 - 10 edition 2/96 - ? melcher ag melcher the power partners. 5.1 option -9 extended temperature range the operational ambient temperature range is extended to t a = C40...71 c. option p potentiometer option p and the r-function cannot be supported simulta- neously. the output voltage u o can be adjusted with a screwdriver in the range from 0.92...1.08 of the nominal output voltage u o nom . however, the minimum differential voltage d u i o min between input and output voltages as specified in "electrical input and output data" should be maintained. option u ambient temp. range acc. ul recognition underwriters laboratories (ul) have approved the psl family as recognized components up to an ambient tem- perature of t a max C 10 k given by the upper temperature limit of the standard pcb material. if the full maximum am- bient temperature t a max is required with ul approval, op- tion u should be requested. it consists of an alternative pcb material with a higher maximum temperature specifi- cation. the european approval boards have in contrast to ul ac- cepted the standard pcb material to be operated up to t a max = 71 c without any further precautions. option l input filter option l is recommended to reduce superimposed inter- ference voltages, and to prevent oscillations, if input lines exceed approx. 5 m in total length. the fundamental wave (approx. 120 khz) of the reduced interference voltage be- tween vi+ and giC has, with an input line inductance of 5 m h a maximum magnitude of 4 mv rms . the input impedance of the switching regulator at 120 khz is about 50 m w . the harmonics are small in comparison with the fundamental wave. see also data: rfi. with option l, the maximum permissible additionally super- imposed ripple u i of the input voltage (rectifier mode) at a specified input frequency f i has the following values: u i max = 10 v pp at 100 hz or v pp = 1000 hz/ f i ? 1 v option c thyristor crowbar this option is recommended to protect the load against power supply malfunction, but it is not designed to sink ex- ternal currents. a fixed-value monitoring circuit checks the output voltage u o . when the trigger voltage u oc is reached, the thyristor crowbar triggers and disables the output. it may be deacti- vated by removal of the input voltage. in case of a switching transistor defect, an internal fuse prevents excessive cur- rent. note: as a central overvoltage protection device, the crow- bar is usually connected to the external load via distributed inductance of the lines. for this reason, the overvoltage at the load can temporarily exceed the trigger voltage u oc . de- pending on the application, further decentralized over- voltage protection elements may have to be used addition- ally. table 10: crowbar trigger levels characteristics conditions 12 v 15 v 24 v 36 v 48 v unit min max min max min max min max min max u o c trigger voltage u i min ... u i max 13.5 16 16.5 19 27 31 40 45.5 55 60 v i o = 0... i o nom t s delay time t c min ... t c max 1.5 1.5 1.5 1.5 1.5 m s option d save data, input undervoltage monitor note: output instead of input undervoltage monitor is available on request (option d1). if the input voltage u i is below the adjustable threshold volt- age u t , the control circuit for terminal d has low impedance. terminal d and goC are connected to a self-conducting field effect transistor (fet). a 0.5 w zener diode provides protection against overvoltages. the voltage u t can be externally adjusted with a trim poten- tiometer by means of a screwdriver. the hysteresis u h of u t is <2 %. terminal d stays low for a minimum time t low min , in order to prevent any oscillation. u t can be set to a value between u i min and u i max according to fig. 10. it is im- portant to note that the fet can become conductive again when u d > u i C 3v. fig. 11 test circuit with definition of voltage u d and current i d on terminal d. fig. 12 definition of u t and u h vi + gi go 8.2 v d u d +5 v 100 pf i d 10 k w fet u t u d u d high u d low u t u i u h
rugged environment switching regulators 19" psl-family edition 2/96 - ? melcher ag 5 - 11 melcher the power partners. 5.1 application examples a) the signal u d can be utilized in battery powered systems to provide a warning in case of low batteries . b) in case of power failure, the signal can serve to initiate data save routines. option a test sockets test sockets (pin ? = 2 mm) for measuring the output volt- age are located at the front panel of the module. the output voltage is measured internally directly at the connector pins. data table 11: option d data characteristics conditions psl unit min typ max u d low voltage - terminal d at low impedance u i < u t , i d 2.5 ma 0.8 v u d high voltage - terminal d at high impedance u i > u t + u h , i d > 25 m a 4.75 t low min minimum duration u d low 30 ms t d f response time to u d low 1 m s i d max maximum current - terminal d 20 ma mechanical data dimensions in mm. tolerances 0.3 mm unless otherwise indicated. 127 159.4 168.5 0.5 173.7 0.5 100 (19.1) 6.4 11 measuring point of case temperature t c 2 32 4.9 ?.2 test sockets (option a) led output voltage indicator potentiometer (option p) mounting plane of connector h11 ? 0.9 17.4 10.9 1.5 20.32 min. 5 potentiometer (option d) m3; 4 mm deep (for mounting screws) 107 1 88 99 9.5 36.5 0.8 100 0.5 9.1 x 4.1 35 26.6 34.3 40.6 m2.5 20 0.5 4 te 6 te 2 te 4 te fig. 13 case l04 (weight 550 g) european projection
psl-family switching regulators 19" rugged environment 5 - 12 edition 2/96 - ? melcher ag melcher the power partners. 5.1 type key and product marking type key psl 12 6 -7 l i r p c d a positive switching regulator in case l04 ..................... psl blank .................................................................................. nominal output voltage in volt ................................. 12...48 nominal output current in ampere .................................... 6 ambient temperature range t a = C25...71 c ................................................... -7 t a = C40...71 c ................................................... -9 input filter ......................................................................... l inhibit input ........................................................................ i external output voltage adjustment ................................. r potentiometer ................................................................... p thyristor-crowbar ........................................................... c "save data" undervoltage monitor .................................. d test sockets ..................................................................... a example:psl 126-7lipc = a positive switching regulator with a 12 v, 6 a output, ambient temperature range of C2571 c, input filter, inhibit input, potentiometer and thyristor-crowbar. produkt marking main face: family designation, applicable safety approval and recognition marks, warnings, pin allocation, melcher pat- ent nos. and company logo. front plate: identification of led, optional test sockets and potentiometers. back plate: specific type designation, input voltage range, nominal output voltage and current, pin allocation of options and auxiliary functions and degree of protection. rear side: label with batch no., serial no. and data code comprising production site, modification status of the main pcb and production date.

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