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industrial environment switching regulators, pcb & chassis psc-family edition 2/96 - ? melcher ag 4 - 53 melcher the power partners. 4.2 psr: positive switching regulators psc-family no input to output isolation single output of 5.1, 12, 15, 24 or 36 v dc/51...288 w input voltage up to 80 v dc ? high efficiency up to 96 % ? wide input voltage range ? low input-to-output differential voltage ? very good dynamic properties ? input undervoltage cut-out ? external output voltage adjustment and inhibit ? continuous no-load and short-circuit proof ? no derating safety according to iec 950 c table of contents page type survey .............................................................. 4 - 53 description ................................................................ 4 - 53 safety and installation instructions ........................... 4 - 54 standard features .................................................... 4 - 55 immunity to environmental conditions ...................... 4 - 56 electromagnetic compatibility emc .......................... 4 - 57 electrical input and output data ............................... 4 - 58 characteristics and definitions .................................. 4 - 60 description of options ............................................... 4 - 61 mechanical data ....................................................... 4 - 63 type key and product marking ................................. 4 - 63 type survey table 1: type survey nominal nominal input nominal efficiency type options superseded output output voltage input designation old type voltage current range voltage (phase-out) u o nom i o nom u i 1 u i nom h 5.1 v 12 a 7...40 v 20 v 83 % psc 5a12-7ir -9, l, p, c, d psr 512-7 5.1 v 10 a 8...80 v 40 v 79 % psc 5a10-7ir psr 510-7 12 v 8 a 15...80 v 90 % psc 128-7ir psr 128-7 15 v 19...80 v 91 % psc 158-7ir psr 158-7 24 v 29...80 v 50 v 94 % psc 248-7ir psr 248-7 36 v 42...80 v 60 v 96 % psc 368-7ir psr 368-7 1 see data d u io min (min. differential voltage u i C u o ) description the psc 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 80 v are specially designed for secondary switched and battery driven applications. case c03: 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. www.datasheet.co.kr datasheet pdf - http://www..net/
psc-family switching regulators, pcb & chassis industrial environment 4 - 54 edition 2/96 - ? melcher ag melcher the power partners. 4.2 fig. 1 block diagram control circuit p (option) go vo+ gi vi+ input filter l (option) g r i g i o u o i i u i c e c (option) d (option) 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 80 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 80 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 80 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. 3 the earth connection has to be provided by the installer according to the relevant safety standards, e.g. iec 950. 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. 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! www.datasheet.co.kr datasheet pdf - http://www..net/
industrial environment switching regulators, pcb & chassis psc-family edition 2/96 - ? melcher ag 4 - 55 melcher the power partners. 4.2 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. cleaning agents in order to avoid possible damage, any penetration of cleaning fluids is to be prevented, since the power supplies are not hermetically sealed. protection degree the protection degree is defined by ip 20. standard features i inhibit note: with open i-input, output is enabled ( u o = on) 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. fig. 3 output response as a function of inhibit signal data table 3: 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 fig. 2 definition of i inh and u inh fig. 4 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 vi+ gi go i vo+ i inh u inh 1 0.1 0 0 u o / u o nom u inh t r t f t t 1 www.datasheet.co.kr datasheet pdf - http://www..net/
psc-family switching regulators, pcb & chassis industrial environment 4 - 56 edition 2/96 - ? melcher ag melcher the power partners. 4.2 r external output voltage adjustment note: with open r input, u o = u o nom . (for superseded psr types, u o = 1.08 ? u o nom ) r-input and 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 0...1.08 of u o nom . the minimal differen- tial voltage d u io min between input and output should be maintained (see data). min. input = undervoltage lock-out. caution: to prevent damage u ex should not exceed 20 v, nor be negative. fig. 5 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 2%) u ref fig. 6 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 - 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 2%) k ? u o - u ref all formulae give approximate values only. vo + r + 4000 w g u ref u ex + go vo + r + g 4000 w u ref r 1 r 2 go 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 table 5: temperature specifications, valid for air pressure of 800...1200 hpa (800...1200 mbar) temperature standard -7 option -9 characteristics conditions min max min max unit t a ambient temperature 1 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 1 not operational C40 100 C55 100 1 mil-std-810d section 501.2 and 502.2 www.datasheet.co.kr datasheet pdf - http://www..net/
industrial environment switching regulators, pcb & chassis psc-family edition 2/96 - ? melcher ag 4 - 57 melcher the power partners. 4.2 table 6: mtbf and device hours mtbf ground benign ground fixed ground mobile device hours 1 mtbf acc. to mil-hdbk-217f t c = 40 c t c = 40 c t c = 70 c t c = 50 c 660'000 h 143'000 h 81'000 h 68'000 h 2'800'000 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 not 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 3 contact discharge 6000 v p 1/50 ns 330 w 10 positive and yes 1 6 discharge (1991-04) to case 10 negative discharges electric field iec 801-3 2 antenna in 3 v/m sine wave mod- 261000 mhz yes 1 (1984) 1m distance ulated w. 1 khz fast transient/ iec 801-4 3 i/c, +i/Ci 2000 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 2 , 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". www.datasheet.co.kr datasheet pdf - http://www..net/
psc-family switching regulators, pcb & chassis industrial environment 4 - 58 edition 2/96 - ? melcher ag melcher the power partners. 4.2 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 psc 5a12 psc 5a10 psc 128 unit min typ max min typ max min typ max output u o nom output voltage u i nom , i o nom 5.07 5.13 5.07 5.13 11.92 12.07 v i o nom output current u i min ... u i max 12.0 10.0 8.0 a i ol output current t c min ... t c max 12.0 15.6 10.0 13.0 8.0 10.4 limitation response u o ripple at output u i nom 35 50 35 50 80 150 mv pp (bw = 20 mhz) i o nom d u o u static control deviation u i min ... u i max 30 45 30 45 50 75 mv versus input voltage u i i o nom d u o i static control deviation u i nom 20 25 20 25 30 35 versus output current i o i o = 0 i o nom u o d dynamic control u i nom 130 130 130 deviation 1 i o n om ? 1 / 3 i o nom t r dynamic load transient 40 50 60 m s time recovery 1 a uo temperature coefficient u i min ... u i max 1 1 2 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 i o = 0... i o nom 7 40 8 80 15 80 v dc t c min ... t c max d u io min minimum differential 2 3 3 v voltage u i - u o 2 u i o undervoltage cut-out 6.3 7.3 7.3 i i 0 no load i o = 0 45 40 35 ma input current u i min ... u i max i i m peak value of u i nom 150 250 250 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 250 350 350 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 83 79 90 % isolation u is isolation test voltage inputs/outputs 750 750 750 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 = 120 m f/100 v, e.g. nichicon, pf(m) series, or equivalent www.datasheet.co.kr datasheet pdf - http://www..net/
industrial environment switching regulators, pcb & chassis psc-family edition 2/96 - ? melcher ag 4 - 59 melcher the power partners. 4.2 table 8b: input and output data characteristics conditions psc 158 psc 248 psc 368 unit min typ max min typ max min typ max output u o nom output voltage u i nom , i o nom 14.91 15.09 23.85 24.14 35.78 36.22 v i o nom output current u i min ... u i max 8.0 8.0 8.0 a i ol output current t c min ... t c max 8.0 10.4 8.0 10.4 8.0 10.4 limitation response u o ripple at output u i nom 80 150 100 250 150 300 mv pp (bw = 20 mhz) i o nom d u o u static control deviation u i min ... u i max 70 100 150 220 200 270 mv versus input voltage u i i o nom d u o i static control deviation u i nom 35 45 120 160 125 160 versus output current i o i o = 0 i o nom u o d dynamic control u i nom 130 150 220 deviation 1 i o n o m ? 1 / 3 i o nom t r dynamic load transient 60 80 100 m s time recovery 1 a uo temperature coefficient u i min ... u i max 3 5 8 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 i o = 0... i o nom 19 80 29 80 42 80 v dc t c min ... t c max d u io min minimum differential 4 5 6 v voltage u i - u o 2 u i o undervoltage cut-out 7.3 12 19 i i 0 no load i o = 0 35 35 40 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 91 94 96 % isolation u is isolation test voltage inputs/outputs 750 750 750 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 = 120 m f/100 v, e.g. nichicon, pf(m) series, or equivalent www.datasheet.co.kr datasheet pdf - http://www..net/
psc-family switching regulators, pcb & chassis industrial environment 4 - 60 edition 2/96 - ? melcher ag melcher the power partners. 4.2 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 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. 9 overload, short-circuit behaviour u o versus i o fig. 7 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. 8 output power derating versus ambient temperature 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 www.datasheet.co.kr datasheet pdf - http://www..net/
industrial environment switching regulators, pcb & chassis psc-family edition 2/96 - ? melcher ag 4 - 61 melcher the power partners. 4.2 description of options option -9 extended temperature range the operational ambient temperature range is extended to t a = C40...71 c. 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: input voltage up to 80 v: u i max = 22 v pp at 100 hz or v pp = 2200 hz/ f i ? 1 v input voltage up to 40 v: u i max = 12 v pp at 100 hz or v pp = 1200 hz/ f i ? 1 v 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 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 0.921.08 of the nominal output voltage u o nom . 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 excess current. 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 . depending on the application, further decentralized over- voltage protection elements may have to be used addition- ally. table 9: crowbar trigger levels characteristics conditions 5.1 12 v 15 v 24 v 36 v unit min max min max min max min max min max u o c trigger voltage u i min ... u i max 5.8 6.8 13.5 16 16.5 19 27 31 40 45.5 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 u ambient temp. range acc. ul recognition underwriters laboratories (ul) have approved the psc family as recognized components up to an ambient tem- perature of t a max C 25 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. www.datasheet.co.kr datasheet pdf - http://www..net/
psc-family switching regulators, pcb & chassis industrial environment 4 - 62 edition 2/96 - ? melcher ag melcher the power partners. 4.2 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 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. fig. 10 test circuit with definition of voltage u d and current i d on terminal d. fig. 11 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 data table 10: option d data characteristics conditions psc 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 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 . it is important to note that the fet can become conductive again when u d > u i C 3v. www.datasheet.co.kr datasheet pdf - http://www..net/
industrial environment switching regulators, pcb & chassis psc-family edition 2/96 - ? melcher ag 4 - 63 melcher the power partners. 4.2 mechanical data dimensions in mm. tolerances 0.3 mm unless otherwise specified. type key and product marking type key psc 12 8 -7 l i r p c d positive switching regulator in case c03 .................... psc blank .................................................................................. nominal output voltage in volt (5a C> 5.1) ............. 5.1...36 nominal output current in ampere ............................. 8...12 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 example:psc 128-7lipc = a positive switching regulator with a 12 v, 8 a output, ambient temperature range of C 2571 c, input filter, inhibit input, potentiometer and thyristor-crowbar. produkt marking main face: family designation, applicable safety approval and recognition marks, warnings, melcher patent nos. and com- pany logo. cover: specific type designation, input voltage range, nominal output voltage and current, pin allocation, identification of led, potentiometers 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 date of production. gi go vo+ i vi+ d u o u o u t gr 7.5 27.5 18.5 11.3 40 7.5 10 7.5 10 (14) 7.5 10 2 4.3 min. 8 5 0.5 144 12.5 1 43 1 (45) 88 1 7 2 151 1 32.2 0.5 2.8 x 0.8 8.1 1 6.35 1 6.3 x 0.8 distance between m4 mounting screws measuring point of case temperature t c led-output voltage indicator potentiometer (option p) potentiometer (option d) fig. 12 case c03 (weight 440 g) european projection www.datasheet.co.kr datasheet pdf - http://www..net/

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