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product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 1 mcots-c-28-50-hz single output half-brick mcots-c-28-50-hz-n-m dc/dc converter 28 in 50v out @ 10a the milqor series of mil-cots dc/dc converters brings synqors field proven high-efficiency synchronous rectification technology to the military/aerospace industry. synqors ruggedized encased packaging approach ensures survivability in demanding environments. compatible with the industry standard format, these converters operate at a fixed frequency, and follow conservative component derating guidelines. they are designed and manufactured to comply with a wide range of military standards. full power operation: -55c to +100c mil-cots m ilitary cots dc/dc c onverter designed and manufactured in the usa 16-40v 16-50v 50v 10a 95% @ 5a / 94% @ 10a continuous input transient input output output effciency protection features ? input under-voltage lockout ? output current limit and short circuit protection ? active back bias limit ? auto-recovery output over-voltage protection ? thermal shutdown screening/qualification ? as9100 and iso 9001:2008 certifed facility ? qualifcation consistent with mil-std-883 ? available with s-grade or m-grade screening ? temperature cycling per mil-std-883, method 1010, condition b, 10 cycles ? burn-in at 100c baseplate temperature ? final visual inspection per mil-std-2008 ? full component traceability operational features mechanical features control features safety features ? high effciency, 94% at full rated load current ? operating input voltage range: 16-40v ? fixed frequency switching provides predictable emi ? no minimum load requirement ? on/off control referenced to input return ? remote sense for the output voltage ? wide output voltage trim range of +10%, -50% ? optional: active current share for parallel applications ? 2250v, 30 m? input-to-output isolation ? certifed 60950-1 requirement for basic insulation (see standards and qualifcations page) ? industry standard half-brick pin-out confguration ? size: 2.49 x 2.39 x 0.51 (63.1 x 60.6 x 13.0 mm) ? total weight: 4.9 oz. (139 g) ? flanged baseplate version available
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 2 mcots-c-28-50-hz output: 50v current: 10a block diagram typical connection diagram v i n external input filter trim v in( + ) i l oa d c l oa d v out(+ ) r trim-up or r trim-down v sense( + ) on/off v in( _ ) v out( _ ) v sense( _ ) electrolytic capacitor ? sense isolation stage regulation stage 8 4 uvlo ovsd secondary control gate control primary control positive input input return on / off 6 7 5 1 3 2 positive output output return trim + sense gate drivers i s o l a t i o n b a r r i e r t 1 t 1 t 2 t 2 current limit current sense opto - isolation data coupling
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 3 mcots-c-28-50-hz output: 50v current: 10a mcots-c-28-50-hz electrical characteristics ta = 25 c, vin = 28dc unless otherwise noted; full operating temperature range is -55 c to +100 c baseplate temperature with appropriate power derating. specifcations subject to change without notice. parameter min. typ. max. units notes & conditions absolute maximum ratings input voltage non-operating 50 v continuous operating 40 v continuous operating transient protection 50 v 100 ms transient, square wave isolation voltage input to output 2250 vdc basic insulation, pollution degree 2 input to base-plate 2250 vdc output to base-plate 2250 vdc operating temperature -55 100 c baseplate temperature storage temperature -65 135 c voltage at on/off input pin -2 18 v input characteristics operating input voltage range 16 28 40 v 50v transient for 100 ms input under-voltage lockout turn-on voltage threshold 15.1 15.4 15.7 v turn-off voltage threshold 14.2 14.5 14.8 v lockout voltage hysteresis 0.5 0.9 1.5 v recommended external input capacitance 470 f typical esr 0.1-0.2 input filter component values (l\c) 0.34\23 h\f internal values; see figure e maximum input current 41.0 a at low line, full load and trimmed up 10% no-load input current 340 430 ma disabled input current 100 125 ma response to input transient 1.5 v 0.25 v/s input transient input terminal ripple current 500 ma rms recommended input fuse 40 a fast blow external fuse recommended output characteristics output voltage set point 49.18 50 50.70 v output voltage regulation see note 1 over line 0.25\125 %\mv over load 0.25\125 %\mv over temperature 0.380 1.250 v total output voltage range 48.50 51.50 v over sample, line, load, temperature & life output voltage ripple and noise 20 mhz bandwidth; see note 2 peak-to-peak 250 300 mv full load rms 60 75 mv full load operating output current range 0 10 a subject to thermal derating output dc current-limit inception 11 12 13 a output voltage 10% low output dc current-limit shutdown voltage 20 v see note 3 back-drive current limit while enabled 2 3 4 a negative current drawn from output back-drive current limit while disabled 0 3 7 ma negative current drawn from output maximum output capacitance 1 mf 10 a resistive load output voltage during load current transient step change in output current (0.1 a-5 a/s) 2 v 50% to 75% to 50% iout max, 200 f load cap settling time 8 ms to within 1% vout nom output voltage trim range -50 10 % across pins 8 & 4; figure c output over-voltage protection 56.5 59 61.5 v over full temp range efficiency #n/a! #n/a! #n/a! #n/a! #n/a! 100% load 94 % see figure 1 for effciency curve 50% load 95 % see figure 1 for effciency curve
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 4 mcots-c-28-50-hz output: 50v current: 10a mcots-c-28-50-hz electrical characteristics ta = 25 c, vin = 28dc unless otherwise noted; full operating temperature range is -55 c to +100 c baseplate temperature with appropriate power derating. specifcations subject to change without notice. parameter min. typ. max. units notes & conditions dynamic characteristics turn-on transient turn-on time 24 35 40 ms full load, vout=90% nom. output voltage overshoot 2 % no load, 1mf load cap isolation characteristics isolation voltage (dielectric strength) 2250 v isolation resistance 30 m isolation capacitance (input to output) 1000 pf see note 4 temperature limits for power derating curves semiconductor junction temperature 125 c package rated to 150 c board temperature 125 c ul rated max operating temp 130 c transformer temperature 125 c maximum baseplate temperature, tb 100 c feature characteristics switching frequency 230 240 250 khz isolation stage switching freq. is half this on/off control off-state voltage 4 18 v on-state voltage -2 1 v on/off control pull-up voltage 4.75 5 5.25 v pull-up resistance 10 k over-temperature shutdown otp trip point 120 c average pcb temperature over-temperature shutdown restart hysteresis 10 c reliability characteristics calculated mtbf (telcordia) tr-nwt-000332 1.49 10 6 hrs. tb = 70 c calculated mtbf (mil-217) mil-hdbk-217f 1.31 10 6 hrs. tb = 70 c field demonstrated mtbf tbd 10 6 hrs. note 1: line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference. note 2: for applications requiring reduced output voltage ripple and noise, consult synqor applications support (e-mail: support@synqor.com). note 3: if the output voltage falls below the output dc current limit shutdown voltage for more than 50ms, then the unit will enter into hiccup mode, with a 500ms off-time. note 4: higher values of isolation capacitance can be added external to the module. standards compliance parameter notes & conditions standards compliance ul 60950-1:2003 basic insulation can/csa-c22.2 no. 60950-1:2003 en60950-1:2001 note: an external input fuse must always be used to meet these safety requirements. contact synqor for offcial safety certifcates on new releases or download from the synqor website.
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 5 mcots-c-28-50-hz output: 50v current: 10a 60 65 70 75 80 85 90 95 100 0 2 4 6 8 10 load current (a) efficiency (%) 16vin 28vin 40vin figure 1: efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 c. figure 2: efficiency at nominal output voltage and 60% rated power vs. case temperature for minimum, nominal, and maximum input voltage. figure 3: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at t case =25 c. figure 4: power dissipation at nominal output voltage and 60% rated power vs. case temperature for minimum, nominal, and maximum input voltage. figure 6: output voltage vs. load current showing typical current limit curves. see current limit section in the application notes. 60 65 70 75 80 85 90 95 100 -55oc 25oc 100oc case temperature (oc) efficiency (%) 16 vin 28 vin 40 vin 0 5 10 15 20 25 30 35 - 55 oc 25 oc 100 oc case temperature ( oc ) power dissipation (w) 16 vin 28 vin 40 vin 0 5 10 15 20 25 30 35 40 45 50 55 60 0 2 4 6 8 10 load current (a) power dissipation (w) 16vin 28vin 40vin 0.0 10.0 20.0 30.0 40.0 50.0 60.0 0 2 4 6 8 10 12 14 load current (a) output voltage (v) 16 vin 28 vin 40 vin figure 5: maximum output current vs. base plate temperature (nominal input voltage). 0 2 4 6 8 10 12 50 60 70 80 90 100 110 base plate temperature ( c ) iout (a)
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 6 mcots-c-28-50-hz output: 50v current: 10a figure 9: input terminal current ripple, i c , at full rated output current and nominal input voltage with synqor mcots flter module (200 ma/div). bandwidth: 20mhz. see figure 17. figure 10: output voltage ripple, vout, at nominal input voltage and rated load current (50 mv/div). load capacitance: 1f ceramic capacitor and 10f tantalum capacitor. bandwidth: 10 mhz. see figure 17. figure 12: output voltage response to step-change in input voltage (250v/ms). load cap: 330 f electrolytic output capacitance. ch 1: vin (5v/div), ch 2: vout (1v/div). figure 11: output voltage response to step-change in load current (50%- 75%-50% of iout(max); di/dt = 5 a/s). load cap: 1 f ceramic and 100 f electrolytic capacitors. ch 1: vout (1v/div), ch 2: iout (5a/div). figure 8: turn-on transient at full resistive load and zero output capacitance initiated by vin. on/off pin previously low. ch 1: vin (10v/div). ch 2: vout (10v/div). figure 7: typical startup waveform. input voltage pre-applied, on/off pin on ch 2.
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 7 mcots-c-28-50-hz output: 50v current: 10a figure 13: magnitude of incremental output impedance (z out = v out / i out ) for minimum, nominal, and maximum input voltage at full rated power. figure 14: magnitude of incremental forward transmission (ft = v out / v in ) for minimum, nominal, and maximum input voltage at full rated power. figure 15: magnitude of incremental reverse transmission (rt = i in / i out ) for minimum, nominal, and maximum input voltage at full rated power. figure 16: magnitude of incremental input impedance (z in = v in /i in ) for minimum, nominal, and maximum input voltage at full rated power. figure 17: test set-up diagram showing measurement points for input terminal ripple current (figure 9) and output voltage ripple (figure 10). dc/dc converter v source i c v out 0.01 0.1 1 10 10 100 1,000 10,000 100,000 hz output impedance (ohms) 28vin 40vin 16vin 10 100 1000 10000 100000 1000000 10000000 100 1,000 10,000 100,000 hz input impedance (ohms) 28vin 40vin 16vin -25 -20 -15 -10 -5 0 5 10 15 20 10 100 1,000 10,000 100,000 hz forward transmission (db) 28vin 40vin 16vin -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1,000 10,000 100,000 hz reverse transmission (db) 28vin 40vin 16vin 3.3 h source impedance 470 f, 0.2 ? esr electrolytic capacitor 100 f, 180m? esr electrolytic capacitor 1 f ceramic capacitor figure 18: load current (5a/div) as a function of time (10ms/div) when the converter attempts to turn on into a 10 m? short circuit.
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 8 mcots-c-28-50-hz output: 50v current: 10a basic operation and features the converter series uses a two-stage power conversion topology. the first stage keeps the output voltage constant over variations in line, load, and temperature. the second stage uses a transformer to provide the functions of input/output isolation and voltage step- down to achieve the low output voltage required. both the first stage and the second stage switch at a fixed fre - quency for predictable emi performance. rectification of the trans - formers output is accomplished with synchronous rectifiers. these devices, which are mosfets with a very low on-state resistance, dissipate significantly less energy than schottky diodes, enabling the converter to achieve high efficiency. the series of half-brick, quarter-brick and eighth-brick converters uses the industry standard footprint and pin-out configuration. control features remote on/off (pin 2 ): the on/off input, pin 2, permits the user to control when the converter is on or off . this input is referenced to the return terminal of the input bus, vin(-). the on/off signal is active low (meaning that a low voltage turns the converter on ). figure a details four possible circuits for driving the on/off pin. remote sense( + ) (pins 8 and 6) : the sense( + ) inputs correct for voltage drops along the conductors that connect the converters output pins to the load. pin 8 should be connected to vout(+) and pin 6 should be connect - ed to vout(-) at the point on the board where regulation is desired. if these connections are not made, the converter will deliver an output voltage that is slightly higher than its specified value. note : the output over-voltage protection circuit senses the voltage across the sense leads (pins 8 and 6) to determine when it should trigger, not the voltage across the converters output pins (pins 9 and 5). output voltage trim (pin 7) : the trim input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. synqor uses industry standard trim equations. to decrease the output voltage, the user should connect a resistor between pin 7 (trim) and pin 6 (sense( C ) input). for a desired decrease of the nominal output voltage, the value of the resistor should be: r trim-down = ( 100% ) _ 2 k w d where d% = v nominal C v desired x 100% v nominal figure a: various circuits for driving the on/off pin. open collector enable circuit remote enable circuit direct logic drive negative logic (permanently enabled) on/off vin( _ ) on/off on/off vin( _ ) on/off 5v ttl/ cmos vin( _ ) vin( _ )
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 9 mcots-c-28-50-hz output: 50v current: 10a to increase the output voltage, the user should connect a resistor between pin 7 (trim) and pin 8 (sense(+) input). for a desired increase of the nominal output voltage, the value of the resistor should be figure b graphs the relationship between the trim resistor value, rtrim-up and rtrim-down, showing the total range the output volt - age can be trimmed up or down. note : the trim feature does not affect the voltage at which the output over-voltage protection circuit is triggered. trimming the output voltage too high may cause the over-voltage protection circuit to engage, particularly during transients. it is not necessary for the user to add capacitance at the trim pin. the node is internally filtered to eliminate noise. total dc variation of vout: for the converter to meet its full specifications, the maximum variation of the dc value of vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range. protection features input under-voltage lockout : the converter is designed to turn off when the input voltage is too low, helping to avoid an input system instability problem, which is described in more detail in the application note titled input system instability on the synqor website . the lockout circuitry is a comparator with dc hysteresis. when the input voltage is rising, it must exceed the typical turn-on voltage threshold value* before the converter will turn on. once the converter is on, the input voltage must fall below the typical turn-off voltage threshold value before the converter will turn off. output current limit : if the output current exceeds the output dc current limit inception point*, then a fast linear current limit controller will reduce the output voltage to maintain a constant output current. if as a result, the output voltage falls below the output dc current limit shutdown voltage * for more than 50 ms, then the unit will enter into hiccup mode, with a 500 ms off-time. the unit will then automatically attempt to restart. back-drive current limit : if there is negative output current of a magnitude larger than the back-drive current limit while enabled specification*, then a fast back-drive limit controller will increase the output voltage to maintain a constant output current. if this results in the output voltage exceeding the output over- voltage protection threshold*, then the unit will shut down. the full i-v output characteristics can be seen in figure 15. output over-voltage limit : if the voltage directly across the output pins exceeds the output over-voltage protection thresh - old*, the converter will immediately stop switching. the converter will automatically attempt to restart with a 500ms off-time. over-temperature shutdown : a temperature sensor on the converter senses the average temperature of the module. the ther - mal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the over-temperature shutdown value*. it will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the over-temperature shutdown restart hysteresis value*. * see electrical characteristics page. r trim-up k w = vnominal 1.225 v des C v nom x v des + v nom C 2 ) ( 0.0 0.1 1.0 10.0 100.0 1,000.0 10,000.0 100,000.0 0 5 10 15 20 25 30 35 40 45 50 trim resistance (kohms) % increase in vout % decrease in vout figure b: trim graph for 28 vout module
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 10 mcots-c-28-50-hz output: 50v current: 10a application considerations input system instability : this condition can occur because any dc-dc converter appears incrementally as a negative resistance load. a detailed application note titled input system instability is available on the synqor website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. application circuits : figure c below provides a typical circuit diagram which details the input filtering and voltage trimming. input filtering and external input capacitance : figure d below shows the internal input filter components. this filter dra - matically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. the recommended external input capacitance is specified in the input characteristics section on the electrical specifications page. more detailed information is available in the application note titled emi characteristics on the synqor website. output filtering and external output capacitance : figure d below shows the internal output filter components. this filter dramatically reduces output voltage ripple. however, some minimum external output capacitance is required, as specified in the output characteristics section on the electrical specifications page. no damage will occur without this capacitor connected, but peak output voltage ripple will be much higher. thermal considerations: the maximum operating base- plate temperature, t b , is 100 oc. as long as the users thermal system keeps t b < 100 oc, the converter can deliver its full rated power. a power derating curve can be calculated for any heatsink that is attached to the base-plate of the converter. it is only necessary to determine the thermal resistance, r th ba , of the chosen heatsink between the base-plate and the ambient air for a given airflow rate. this information is usually available from the heatsink vendor. the following formula can the be used to determine the maximum power the converter can dissipate for a given thermal condition if its base-plate is to be no higher than 100 oc. p max = 100 oc - t a diss r th ba this value of power dissipation can then be used in conjunction with the data shown in figure 2 to determine the maximum load current (and power) that the converter can deliver in the given thermal condition. figure c: typical application circuit (negative logic unit, permanently enabled). figure d: internal input and output filter diagram (component values listed on specifications page) . v i n external input filter trim v in( + ) i l oa d c l oa d v out(+ ) r trim-up or r trim-down v sense( + ) on/off v in( _ ) v out( _ ) v sense( _ ) electrolytic capacitor c 2 c 1 l in v in( + ) v in( _ ) v out(+) v out(-) regulation stage current sense isolation stage
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 11 mcots-c-28-50-hz output: 50v current: 10a full-featured application notes with the full-featured option, specified by an f in the last character in the part number, current sharing operation is supported connection of paralleled units: up to 100 units can be placed in parallel. in this current share architecture, one unit is dynamically chosen to act as a master, controlling all other units. it cannot be predicted which unit will become the master at any given time, so units should be wired symmetrically (see fig e). ? input power pins and output power pins should be tied together between units, preferably with wide overlapping copper planes. ? the share(+) and share(-) pins should be routed between all paralleled units as a differential pair. ? the on/off pins should be connected in parallel. ? the sense(+) and sense(-) pins should be connected either locally at each unit or separately to a common sense point. ? if the trim pin is used, then each unit should have its own trim resistor connected locally between trim and sense(+) or sense(-). v in (+) vin(- ) vou t (+ ) v o u t(- ) s ha r e ( + ) sh a r e (- ) on/of f s e n s e ( + ) s e nse ( - ) t r i m v i n ( + ) vin(- ) vo u t (+ ) v o u t(- ) s ha r e ( + ) s ha r e ( - ) on/of f s e nse ( + ) s ens e ( - ) t r i m v in (+) v i n ( - ) v out ( + ) vou t ( - ) s ha r e ( + ) sh a r e (- ) on/of f s ens e ( + ) s e nse ( - ) t r i m lo a d >470nh >470nh >470nh >10f up to 100 units electrolytic capacitor electrolytic capacitor electrolytic capacitor figure e: typical application circuit for parallelling of full-feautured units
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 12 mcots-c-28-50-hz output: 50v current: 10a automatic configuration: the micro-controller inside each power converter unit is programmed at the factory with a unique serial number. in every other respect, each shared unit is identical and has the same orderable part number. on initial startup (or after the master is disabled or shuts down), each unit determines the serial number of every other unit currently connected to the shared serial bus formed by the share(+) and share(-) pins. the unit with the highest serial number dynamically reconfigures itself from slave to master. the rest of the units (that do not have the highest serial number) become slaves. the master unit then broadcasts its control state over the shared serial bus on a cycle-by-cycle basis. the slave units interpret and implement the control commands sent by the master, mirroring every action of the master unit. if the master is disabled or encounters a fault condition, all units will immediately shut down, and if the master unit is unable to restart, then the unit with the next highest serial number will become master. if a slave unit is disabled or encounters a fault condition, all other units continue to run, and the slave unit can restart seamlessly. automatic interleaving: the slave units automatically lock frequency with the master, and interleave the phase of their switching transitions for improved emi performance. to obtain the phase angle relative to the master, each slave divides 360 degrees by the total number of connected units, and multiples the result by its rank among serial numbers of connected units. resonance between output capacitors is possible: when units are interleaved, it is possible to excite a series resonance between the output capacitors on two units and the air core inductance formed by the output pins. this is especially likely at higher output voltages where the on-board capacitance is relatively small. the problem is independent of external output capacitance. to ensure that this resonant frequency is below the switching frequency, for output voltages above 18v, it is recommended to add at least 470nh of inductance in series with each converter output. rs-485 physical layer: the internal rs-485 transceiver includes many advanced protection features for enhanced reliability: ? current limiting and thermal shutdown for driver overload protection ? iec61000 esd protection to +/- 16.5kv ? hot plug circuitry C share(+) and share(-) outputs remain tri-state during power-up/power-down internal schottky diode termination: despite signaling at high speed with fast edges, external termination resistors are not necessary. each receiver has four schottky diodes built in, two for each line in the differential pair. these diodes clamp any ringing caused by transmission line reflections, preventing the voltage from going above about 5.5 v or below about -0.5 v. any subsequent ringing then inherently takes place between 4.5 and 5.5 v or between -0.5 and 0.5 v. since each receiver on the bus contains a set of clamping diodes to clamp any possible transmission line reflection, the bus does not necessarily need to be routed as a daisy-chain. pins share(+) and share(-) are referenced to vin(-), and therefore should be routed as a differential pair near the vin(-) plane for optimal signal integrity. the maximum difference in voltage between vin(-) pins of all units on the share-bus should be kept within 0.3v to prevent steady-state conduction of the termination diodes, which would cause increased power dissipation and reduced noise margin. share accuracy: inside the converter micro-controller, the duty cycle is generated digitally with 1ns resolution. this allows for excellent duty cycle matching between connected units. some small duty cycle mismatch is caused by (well controlled) process variations in the mosfet gate drivers. however, the voltage difference induced by this duty cycle mismatch appears across the impedance of the entire power converter, from input to output, multiplied by two, since the differential current flows out of one converter and into another. so, a small duty cycle mismatch yields very small differential currents, which remain small even when 100 units are placed in parallel. in other current-sharing schemes, it is common to have a current- sharing control loop in each unit. however, due to the limited bandwidth of this loop, units do not necessarily share current on startup or during transients before this loop has a chance to respond. in contrast, the current-sharing scheme used in this product has no control dynamics: control signals are transmitted fast enough that the slave units can mirror the control state of the master unit on a cycle-by-cycle basis, and the current simply shares properly, from the first switching cycle to the last.
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 13 mcots-c-28-50-hz output: 50v current: 10a 1.90 [48,3 ] .400 [10,16 ] 1.400 [35,56 ] .400 [10,16 ] .700 [17,78 ] 1.000 [25,4 ] 1.400 [35,56 ] 2.386 .020 [60,6 0,5] .233 .020 [5,92 0,5] .543 .020 [13,79 0,5] 1.90 [48,3 ] 2.486 .020 [63,14 0,5] .243 .020 [6,17 0,5] .243 .020 [6,17 0,5] 2.00 [50,8 ] +.002 .512 -.005 +0,05 13 [ -0,12 ] overall height +.007 .027 -.010 +0,17 0,69 [ -0,25 ] bottomside clearance .163 [4,14 ] 1.00 [25,4 ] .800 [20,32 ] 1 2 4 5 6 7 8 9 side view top view 3 b thru hole m3 (see note 8) standoffs (4) mechanical drawing C normal heatsink option notes 1) applied torque per screw should not exceed 6in-lb (0.7 nm). 2) baseplate flatness tolerance is 0.004" (.10mm) tir for surface. 3) pins 1-4, 6-8, and b are 0.040 (1.02mm) diameter, with 0.080 diameter standoff shoulders. 4) pins 5 and 9 are 0.080 (2.03 mm) diameter with 0.125" (3.18 mm) diameter standoff shoulders. 5) all pins: material C copper alloy; finish C matte tin over nickel plate 6) undimensioned components are shown for visual reference only. 7) weight: 4.9 oz. (139 g) typical 8) threaded or non-threaded options available 9) all dimensions in inches (mm) tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 10) workmanship: meets or exceeds ipc-a610 class ii 11) recommended pin length is 0.03 (0.76mm) greater than the pcb thickness. pin designations pin name function 1 vin(+) positive input voltage 2 on/off ttl input to turn converter on and off, referenced to vin(C), with internal pull up. b share(+) active current share differential pair (see full-feature application notes) (note 4) 3 share(-) 4 in rtn input return 5 out rtn ouput return 6 sense(C) negative remote sense 1 7 trim output voltage trim 2 8 sense(+) positive remote sense 3 9 vout(+) positive output voltage notes: 1) sense(C) should be connected to vout(C) either remotely or at the converter. 2) leave trim pin open for nominal output voltage. 3) sense(+) should be connected to vout(+) either remotely or at the converter. 4) on standard product, pin b & pin 3 are absent
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 14 mcots-c-28-50-hz output: 50v current: 10a .18 [ 4,6 ] see notes 5 & 6 .500 .025 [12,7 0,63] overall height 1.87 [ 47,4 ] .875 .020 [ 22,23 0,5 ] 2.175 .020 [ 55,25 0,5 ] .775 .020 [ 19,69 0,5 ] .027 .020 [ 0,69 0,5 ] .31 [ 7,9 ] .96 [ 24,4 ] 1.61 [ 40,9 ] 3.15 [ 80 ] 2.486 .020 [ 63,14 0,5 ] 2.386 .020 [ 60,6 0,5 ] .125 [ 3,18 ] .400 [ 10,16 ] 1.400 [ 35,56 ] .400 [ 10,16 ] .700 [ 17,78 ] 1.000 [ 25,4 ] 1.400 [ 35,56 ] 1.900 [ 48,26 ] use w/ 4-40 or m3 screw (6x) recom. torque 3 in.lb .13[3,3] 1.000 [ 25,4 ] .543 .020 [ 13,79 0,5 ] .800 [ 20,32 ] top view 1 1 2 4 5 6 7 8 9 bottom view 3 b .01 [0,2] mechanical drawing C flanged heatsink option notes 1) applied torque per screw should not exceed 5in-lb (3in-lb recommended). 2) baseplate flatness tolerance is 0.01 (.25mm) tir for surface. 3) pins 1-4, 6-8, and b are 0.040 (1.02mm) diameter, with 0.080 diameter standoff shoulders. 4) pins 5 and 9 are 0.080 (2.03 mm) diameter with 0.125" (3.18 mm) diameter standoff shoulders. 5) all pins: material C copper alloy; finish C matte tin over nickel plate 6) weight: 4.8 oz. (137 g) typical 7) undimensioned components are shown for visual reference only. 8) all dimensions in inches (mm) tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 9) workmanship: meets or exceeds ipc-a610 class ii 10) recommended pin length is 0.03 (0.76mm) greater than the pcb thickness. 11) a thermal interface material is required to assure proper heat transfer from the flanged baseplate to the cooling surface. thermal grease, conductive pads, compounds, and other similar products are available from many heatsink manufacturers. pin designations pin name function 1 vin(+) positive input voltage 2 on/off ttl input to turn converter on and off, referenced to vin(C), with internal pull up. b share(+) active current share differential pair (see full-feature application notes) (note 4) 3 share(-) 4 in rtn input return 5 out rtn ouput return 6 sense(C) negative remote sense 1 7 trim output voltage trim 2 8 sense(+) positive remote sense 3 9 vout(+) positive output voltage notes: 1) sense(C) should be connected to vout(C) either remotely or at the converter. 2) leave trim pin open for nominal output voltage. 3) sense(+) should be connected to vout(+) either remotely or at the converter. 4) on standard product, pin b & pin 3 are absent
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 15 mcots-c-28-50-hz output: 50v current: 10a mil-cots screening screening process description s-grade m-grade baseplate operating temperature -55?c to +100?c -55?c to +100?c storage temperature -65?c to +135?c -65?c to +135?c pre-cap inspection ipc-610, class iii temperature cycling method 1010, condition b, 10 cycles burn-in 100?c baseplate 12 hours 96 hours final electrical test 100% 25?c -55?c, +25?c, +100?c final visual inspection mil-std-2008 mil-cots qualifcation test name details # tested (# failed) consistent with mil-std-883f method consistent with mil-std-883f method 5005 life testing visual, mechanical and electrical testing before, during and after 1000 hour burn-in @ full load 15 (0) method 1005.8 shock-vibration visual, mechanical and electrical testing before, during and after shock and vibration tests 5 (0) mil-std-202, methods 201a & 213a humidity +85?c, 85% rh, 1000 hours, 2 minutes on/6 hours off 8 (0) method 1004.7 temperature cycling 500 cycles of -55?c to +100?c (30 minute dwell at each temperature 10 (0) method 1010.8 condition a solderability 15 pins 15 (0) method 2003 dmt -65?c to +110?c across full line and load specifcations in 5?c steps 7 (0) altitude 70,000 feet (21 km), see note 2 (0) note: a conductive cooling design is generally needed for high altitude applications because of naturally poor convective cooling at rare atmospheres.
technical specification product # mcots-c-28-50-hz phone 1-888-567-9596 www.synqor.com doc.# 005-0005308 rev. b 05/27/10 page 16 mcots-c-28-50-hz output: 50v current: 10a warranty synqor offers a t wo ( 2 ) year limited warranty. complete warranty information is listed on our website or is available upon request from synqor. information furnished by synqor is believed to be accurate and reliable. however, no responsibility is assumed by synqor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of synqor. contact synqor for further information: phone : 978-849-0600 toll free : 888-567-9596 fax : 978-849-0602 e-mail : mqnbofae @synqor.com web : www.synqor.com address : 155 swanson road boxborough, ma 01719 usa example mcots-c-28-50-hz-n-s not all combinations make valid part numbers, please contact synqor for availability. see product summary page for details. application notes a variety of application notes and technical white papers can be downloaded in pdf format from our website . ordering information/ part numbering patents synqor holds the following u.s. patents, one or more of which apply to each product listed in this document. additional patent applications may be pending or fled in the future. 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702 family product input voltage output voltage package heatsink option screening level options mcots c: converter 28: 16-40v 28v: 9-40v 28ve: 9-70v 48: 34-75v 05: 12: 15: 24: 28: 40: 50: 5v 12v 15v 24v 28v 40v 50v hz: half brick zeta n: d: f: normal threaded normal non- threaded flanged s: s-grade m: m-grade f: full feature

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