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bcm ? bus converter rev 1.2 vicorpower.com page 1 of 21 08/2016 800 927.9474 sw1 enable / disabl e switch f1 v c1 1f in pc tm -out +out -in +in bcm ? v out l o a d features & benefts ? 352v dc C 11v dc 300w bus converter ? high effciency (>95%) reduces system power consumption ? high power density (>1022w/in 3 ) reduces power system footprint by >40% ? contains built-in protection features: n undervoltage n overvoltage lockout n overcurrent protection n short circuit protection n overtemperature protection ? provides enable/disable control, internal temperature monitoring ? can be paralleled to create multi-kw arrays typical applications ? high end computing systems ? automated test equipment ? high density power supplies ? communications systems description the vi chip ? bus converter is a high effciency (>95%) sine amplitude converter? (sac?) operating from a 352 to 365v dc primary bus to deliver an isolated, ratiometric output voltage from 10.3 to 11.4v dc . the sine amplitude converter offers a low ac impedance beyond the bandwidth of most downstream regulators; therefore capacitance normally at the load can be located at the input to the sine amplitude converter. since the transformation ratio of the BCM352X110Y300B00 is 1/32, the capacitance value can be reduced by a factor of 1024x, resulting in savings of board area, materials and total system cost. the bcm352f110y300b00 is provided in a vi chip package compatible with standard pick-and-place and surface mount assembly processes. the co-molded vi chip package provides enhanced thermal management due to a large thermal interface area and superior thermal conductivity. the high conversion effciency of the BCM352X110Y300B00 increases overall system effciency and lowers operating costs compared to conventional approaches. typical application product ratings v in = 352v (330 C 365v) p out = up to 300w v out = 11v (10.3 C 11.4v) ( no load BCM352X110Y300B00 bcm ? bus converter isolated fixed ratio dc-dc converter s nr tl cu s c us ?
bcm ? bus converter rev 1.2 vicorpower.com page 2 of 21 08/2016 800 927.9474 -in pc rsv tm +in -out +out -out +out bottom vie w a b c d e f g h j k l m n p r t 43 21 a b c d e h j k l m n p r t pin confguration pin descriptions pin number signal name type function a1-e1, a2-e2 +in input power positive input power terminal l1-t1, l2-t2 Cin input power return negative input power terminal h1, h2 tm output temperature monitor, input side referenced signal j1, j2 rsv nc no connect k1, k2 pc output/input enable and disable control, input side referenced signal a3-d3, a4-d4, j3-m3, j4-m4 +out output power positive output power terminal e3-h3, e4-h4, n3-t3, n4-t4 Cout output power return negative output power terminal BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 3 of 21 08/2016 800 927.9474 standard models part ordering information device input voltage range package type output voltage x 10 temperature grade output power revision version bcm 352 x 110 y 300 b zz bcm = bcm 352 = 330 C 365v f = full vic smd 110 = 11v t = -40 C 125oc 300 = 300w b 00 = standard t = full vic th m = -55 C 125oc >00 = customer specifc version part number v in package type v out temperature power version bcm352f110t300b00 330 C 365v full vic smd 11v (10.3 C 11.4v) -40 C 125oc 300w 00 = standard bcm352f110m300b00 -55 C 125oc bcm352t110t300b00 330 C 365v full vic th 11v (10.3 C 11.4v) -40 C 125oc 300w 00 = standard bcm352t110m300b00 -55 C 125oc absolute maximum ratings the absolute maximum ratings below are stress ratings only. operation at or beyond these maximum ratings can cause permanent damage to the device. parameter comments min max unit +in to Cin -1 400 v v in slew rate operational -1 1 v/s isolation voltage, input to ouput 4242 v +out to Cout -1 16 v output current transient 10ms, 10% dc -3 41.0 a output current average -2 28.5 a pc to Cin -0.3 20 v tm to Cin -0.3 7 v operating ic junction temperature -40 125 oc storage temperature -40 125 oc BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 4 of 21 08/2016 800 927.9474 electrical specifcations specifcations apply over all line and load conditions, unless otherwise noted; boldface specifcations apply over the temperature range of -40c t case 100c (t-grade); all other specifcations are at t case = 25oc unless otherwise noted. attribute symbol conditions / notes min typ max unit powertrain input voltage range, continuous v in_dc 330 365 v input voltage range, transient v in_trans full current or power supported, 50ms max, 10% duty cycle max 330 365 v quiescent power p q disabled, pc low 360 432 mw v in to v out time t on1 v in = 352v, pc foating 380 440 500 ms no load power dissipation p nl v in = 352v, t case = 25oc 6.4 7.7 w v in = 352v 3 15 v in = 330v to 365v, t case = 25oc 11 v in = 330v to 365v 15 inrush current peak i inr_p worse case of: v in = 365v, c out = 1200 f, r load = 1.6 1.7 3.5 a dc input current i in_dc at p out = 300w 0.9 a transformation ratio k k = v out / v in , at no load 1/32 v/v output power (average) p out_avg i out_avg 28.5a 300 w output power (peak) p out_pk 10ms max, p out_avg 300w 450 w output current (average) i out_avg p out_avg 300w 28.5 a output current (peak) i out_pk 10ms max, i out_avg 28.5a 41.0 a effciency (ambient) h amb v in = 352 v, i out = 28.5a; t case = 25c 94.5 95.5 % v in = 330v to 365v, i out = 28.5a; t case = 25c 94.0 v in = 352 v, i out = 14.25a; t case = 25c 94.0 94.4 effciency (hot) h hot v in = 352 v, i out = 28.5a; t case = 100c 94.0 95.2 % effciency (over load range) h 20% 5.70a < i out < 28.5a 90.0 % output resistance r out_cold i out = 28.5a, t case = -40c 2.5 5.0 7.0 m r out_amb i out = 28.5a, t case = 25c 5.4 7.7 10.7 r out_hot i out = 28.5a, t case = 100c 7.0 10.0 13.0 switching frequency f sw 1.85 1.95 2.05 mhz output voltage ripple v out_pp c out = 0f, i out = 28.5a, v in = 352 v, 20mhz bw 200 400 mv output inductance (parasitic) l out_par frequency up to 30mhz, simulated j-lead model 500 ph output capacitance (internal) c out_int effective value at 11v out 31.0 f output capacitance (external) c out_ext see chart for output capacitance vs. startup load limits 0 1200 f BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 5 of 21 08/2016 800 927.9474 electrical specifcations (cont.) specifcations apply over all line and load conditions, unless otherwise noted; boldface specifcations apply over the temperature range of -40c t case 100c (t-grade); all other specifcations are at t case = 25oc unless otherwise noted. attribute symbol conditions / notes min typ max unit protection input overvoltage lockout threshold v in_ovlo+ 390 v input overvoltage recovery threshold v in_ovlo- 366 v input overvoltage lockout hysteresis v in_ovlo_hyst 4 v overvoltage lockout response time t ovlo 47 s fault recovery time t auto_restart 380 440 500 ms input undervoltage lockout threshold v in_uvlo- 275 293 315 v input undervoltage recovery threshold v in_uvlo+ 285 307 325 v input undervoltage lockout hysteresis v in_uvlo_hyst 14 v undervoltage lockout response time t uvlo 47 s output overcurrent trip threshold i ocp 30 40 50 a output overcurrent response time constant t ocp effective internal rc flter 4.4 ms short circuit protection trip threshold i scp 45 a short circuit protection response time t scp 1 s thermal shutdown threshold t j_otp 125 c BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 6 of 21 08/2016 800 927.9474 output voltage (v) p (ave) p (pk), < 10ms i (ave) i (pk), < 10ms output power (w) output current (a) 0 5 9 14 18 23 27 32 36 41 45 0 50 100 150 200 250 300 350 400 450 500 9.9 10.0 10.2 10.4 10.5 10.7 10.9 11.1 11.2 11.4 11.6 figure 1 safe operating area load current (%) 0 10 20 30 40 50 60 70 80 90 100 11 0 20 30 40 50 60 70 80 90 100 11 0 10 0 figure 2 start up load current vs. output capacitance electrical specifcations cont. BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 7 of 21 08/2016 800 927.9474 signal characteristics specifcations apply over all line and load conditions, unless otherwise noted; boldface specifcations apply over the temperature range of -40c t case 100c (t-grade); all other specifcations are at t case = 25oc unless otherwise noted. primary control: pc ? the pc pin enables and disables the bcm. when held low, the bcm is disabled. ? in an array of bcm modules, pc pins should be interconnected to synchronize start up and permit start up into full load conditions. ? pc pin outputs 5v during normal operation. pc pin internal bias level drops to 2.5v during fault mode, provided v in remains in the valid range. signal type state attribute symbol conditions / notes min typ max unit analog output regular operation pc voltage v pc 4.7 5.0 5.3 v pc available current i pc_op 2.0 3.5 5.0 ma standby pc source (current) i pc_en 50 100 a pc resistance (internal) r pc_int internal pull down resistor 50 150 400 k transition pc capacitance (internal) c pc_int 4700 pf start up pc load resistance r pc_s to permit regular operation 60 k digital input / output start up pc time to start t on1 380 440 500 ms regular operation pc enable threshold v pc_en 2.0 2.5 3.0 v pc disable threshold v pc_dis 1.95 v standby pc disable duration t pc_dis_t minimum time before attempting re-enable 1 s transition pc threshold hysteresis v pc_hyster 50 mv pc enable to v out time t on2 v in = 352v for at least t on1 ms 50 100 150 s pc disable to standby time t pc_dis 4 10 s pc fault response time t fr_pc from fault to pc = 2v 100 s temperature monitor: tm ? the tm pin monitors the internal temperature of the controller ic within an accuracy of 5c. ? can be used as a power good fag to verify that the bcm module is operating. ? is used to drive the internal comparator for overtemperature shutdown. signal type state attribute symbol conditions / notes min typ max unit analog output regular operation tm voltage range v tm 2.12 4.04 v tm voltage reference v tm_amb t j controller = 27c 2.95 3.00 3.05 v tm available current i tm 100 a tm gain a tm 10 mv/c tm voltage ripple v tm_pp c tm = 0pf, v in = 352v, i out = 28.5a 120 200 mv digital input / output transition tm capacitance (external) c tm_ext 50 pf tm fault response time t fr_tm from fault to tm = 1.5v 10 s standby tm voltage v tm_dis 0 v tm pull down (internal) r tm_int internal pull down resistor 25 40 50 k reserved: rsv reserved for factory use. no connection should be made to this pin. BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 8 of 21 08/2016 800 927.9474 timing diagram 12 34 5 6 v uvl o + pc 5 v 3 v ll ? k a: t on1 b: t ovl o* c: t au t o_rest ar t d:t uvl o e: t on2 f: t ocp g: t pc?dis h: t scp** 1: co ntroller star t 2: co ntroller turn o 3: pc release 4: pc pulled lo w 5: pc released on output sc 6: sc remove d v out tm 3 v @ 27c 0.4 v v in 3 v 5 v 2.5 v 500ms befo re retr ial v uvl o ? a b e h i ssp i out i ocp g f d c v ovlo + v ovlo ? v ovlo + nl notes: ? t iming and signal amplitudes are not to scale ? error pulse width is load dependen t *m in value switching o **f rom detec tion of error to power train shut down c BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 9 of 21 08/2016 800 927.9474 application characteristics the following values, typical of an application environment, are collected at t case = 25oc unless otherwise noted. see associated fgures for general trend data. 4 5 6 7 8 9 10 11 12 13 14 330 334 338 342 346 349 353 357 361 365 input voltage (v) -40oc 25oc 100oc power dissipation (w) 94.0 94.5 95.0 95.5 96.0 96.5 97.0 -40 -20 0 20 40 60 80 100 case temperature (oc) 330 v 352 v 365 v v in : full load efficiency (%) 74 78 82 86 90 94 98 load current (a) efficiency (%) 70 0.0 2.8 5.6 8.4 11.2 14.0 16.8 19.6 22.4 25.2 28.0 v in : 330v 352v 365v figure 3 ? no load power dissipation vs. v in in e t e 74 78 82 86 90 94 98 load current (a) efficiency (%) 70 0.0 2.8 5.6 8.4 11.2 14.0 16.8 19.6 22.4 25.2 28.0 v in : 330v 352v 365v figure 7 ? efciency at t case = 25c load current (a) power dissipation (w) 0 5 10 15 20 25 30 35 0.0 2.8 5.6 8.4 11.2 14.0 16.8 19.6 22.4 25.2 28.0 v in : 330v 352v 365v figure 6 ? power dissipation at t case = -40c load current (a) power dissipation (w) 0 5 10 15 20 25 30 35 0.0 2.8 5.6 8.4 11.2 14.0 16.8 19.6 22.4 25.2 28.0 v in : 330v 352v 365v figure 8 ? power dissipation at t case = 25c BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 10 of 21 08/2016 800 927.9474 application characteristics (cont.) 40 60 80 100 120 140 160 180 200 220 240 0.0 5.0 10.0 15.0 20.0 25.0 30.0 ripple (mv pk-pk ) load current (a) v in : 330v 365v 352v figure 12 v ripple i out : no external c out , , : 74 78 82 86 90 94 98 load current (a) efficiency (%) 70 0.0 2.8 5.6 8.4 11.2 14.0 16.8 19.6 22.4 25.2 28.0 v in : 330v 352v 365v figure 9 effciency at t case = 100c case temperature (c) 6 7 8 9 10 11 12 13 14 -40 -20 0 20 40 60 80 100 r out (m) i out : 28.5a figure 11 r out vs. temperature; nominal input load current (a) power dissipation (w) 0 5 10 15 20 25 30 35 0.0 2.8 5.6 8.4 11.2 14.0 16.8 19.6 22.4 25.2 28.0 v in : 330v 352v 365v figure 10 power dissipation at t case = 100c BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 11 of 21 08/2016 800 927.9474 figure 14 start up from application of pc; v in out figure 13 full load ripple, 2.2f c in : n out , , : figure 16 28.5a C 0a transient response: c in , i in in , out figure 15 0a C 28.5 a transient response: c in , i in i n , out application characteristics (cont.) BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 12 of 21 08/2016 800 927.9474 general characteristics specifcations apply over all line and load conditions, unless otherwise noted; boldface specifcations apply over the temperature range of -40c t case 100c (t-grade); all other specifcations are at t case = 25oc unless otherwise noted. attribute symbol conditions / notes min typ max unit mechanical length l 32.25 / [1.270] 32.50 / [1.280] 32.75 / [1.289] mm / [in] width w 21.75 / [0.856] 22.00 / [0.866] 22.25 / [0.876] mm / [in] height h 6.48 / [0.255] 6.73 / [0.265] 6.98 / [0.275] mm / [in] volume vol no heat sink 4.81 / [0.294] cm 3 / [in 3 ] weight w 14.5 / [0.512] g / [oz] lead finish nickel 0.51 2.03 m palladium 0.02 0.15 gold 0.003 0.051 thermal operating temperature t j bcm352f110t300b00 (t-grade) -40 125 c bcm352f110m300b00 (m-grade) - 55 125 thermal resistance f jc isothermal heatsink and isothermal internal pcb 1 c/w thermal capacity 9 ws/c assembly peak compressive force applied to case (z-axis) supported by j-lead only 6 lbs 5.41 lbs/ in 2 storage temperature t st bcm352f110t300b00 (t-grade) -40 125 c bcm352f110m300b00 (m-grade) - 5 5 125 c esd withstand esd hbm human body model, jedec jesd 22-a114c.01class 1c 20 00 v esd cdm charge device model, jedec jesd 22-c101-d 500 soldering peak temperature during refow msl 4 (datecode 1528 and later) 245 c peak time above 217c 60 90 s peak heating rate during refow 1.5 3 c /s peak cooling rate post refow 1.5 6 c /s safety working voltage (in C out) v in_out 500 v dc isolation voltage (hipot) v hipot 4242 v dc isolation capacitance c in_out unpowered unit 500 660 800 pf isolation resistance r in_out at 500v dc 10 m mtbf mil-hdbk-217plus parts count - 25c ground benign, stationary, indoors / computer profle 3.15 mhrs telcordia issue 2 - method i case iii; 25c ground benign, controlled 6.64 mhrs agency approvals / standards ctuvus curus ce marked for low voltage directive and rohs recast directive, as applicable. BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 13 of 21 08/2016 800 927.9474 using the control signals pc, tm primary control (pc) pin can be used to accomplish the following functions: n logic enable and disable for module: once t on1 time has been satisfed, a pc voltage greater than v pc_en will cause the module to start. bringing pc lower than v pc_dis will cause the module to enter standby. n auxiliary voltage source: once enabled in regular operational conditions (no fault), each bcm module pc provides a regulated 5v, 3.5ma voltage source. n synchronized start up: in an array of parallel modules, pc pins should be connected to synchronize start up across units. this permits the maximum load and capacitance to scale by the number of paralleled modules. n output disable: pc pin can be actively pulled down in order to disable the module. pull down impedance shall be lower than 60 1 . n fault detection fag: the pc 5v voltage source is internally turned off as soon as a fault is detected. n note that pc can not sink signifcant current during a fault condition. the pc pin of a faulted module will not cause interconnected pc pins of other modules to be disabled. temperature monitor (tm) pin provides a voltage proportional to the absolute temperature of the converter control ic. it can be used to accomplish the following functions: n monitor the control ic temperature: the temperature in kelvin is equal to the voltage on the tm pin scaled by 100. (i.e. 3.0v = 300k = 27oc). if a heat sink is applied, tm can be used to protect the system thermally. n fault detection fag: the tm voltage source is internally turned off as soon as a fault is detected. for system monitoring purposes microcontroller interface faults are detected on falling edges of tm signal. BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 14 of 21 08/2016 800 927.9474 sine amplitude converter? point of load conversion the sine amplitude converter (sac?) uses a high frequency resonant tank to move energy from input to output. the resonant lc tank, operated at high frequency, is amplitude modulated as a function of input voltage and output current. a small amount of capacitance embedded in the input and output stages of the module is suffcient for full functionality and is key to achieving power density. the BCM352X110Y300B00 sac can be simplifed into the preceeding model. at no load: v out = v in ? k (1) k represents the turns ratio of the sac. rearranging eq (1): k = v out (2) v in in the presence of load, v out is represented by: v out = v in ? k C i out ? r out (3) and i out is represented by: i out = i in C i q (4) k r out represents the impedance of the sac, and is a function of the r dson of the input and output mosfets and the winding resistance of the power transformer. i q represents the quiescent current of the sac control, gate drive circuitry, and core losses. the use of dc voltage transformation provides additional interesting attributes. assuming that r out = 0 and i q = 0a, eq. (3) now becomes eq. (1) and is essentially load independent, resistor r is now placed in series with v in . the relationship between v in and v out becomes: v out = (v in C i in ? r) ? k (5) substituting the simplifed version of eq. (4) (i q is assumed = 0a) into eq. (5) yields: v out = v in ? k C i out ? r ? k 2 (6) r sac k = 1/32 vi n v out + ? v in out ac figure 18 k = 1/32 sine amplitude converter with series input resistor figure 17 vi chip ? module ac model + ? + ? v out c ou t v in v? i k + ? + ? c in i out r c out i q r out r c in 20.0ma 1/32 ? i out in c in 108nh 480m r c out l out i q l in i out out in out c out c in 31.0f BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 15 of 21 08/2016 800 927.9474 this is similar in form to eq. (3), where r out is used to represent the characteristic impedance of the sac?. however, in this case a real r on the input side of the sac is effectively scaled by k 2 with respect to the output. assuming that r = 1 , the effective r as seen from the secondary side is 1.0m , with k = 1/32. a similar exercise should be performed with the additon of a capacitor or shunt impedance at the input to the sac. a switch in series with v in is added to the circuit. this is depicted in figure 19. a change in v in with the switch closed would result in a change in capacitor current according to the following equation: i c (t) = c dv in (7) dt assume that with the capacitor charged to v in , the switch is opened and the capacitor is discharged through the idealized sac. in this case, i c = i out ? k (8) substituting eq. (1) and (8) into eq. (7) reveals: i out = c ? dv out (9) k 2 dt the equation in terms of the output has yielded a k 2 scaling factor for c, specifed in the denominator of the equation. a k factor less than unity results in an effectively larger capacitance on the output when expressed in terms of the input. with a k = 1/32 as shown in figure 19, c = 1f would appear as c = 1024f when viewed from the output. low impedance is a key requirement for powering a high- current, low-voltage load effciently. a switching regulation stage should have minimal impedance while simultaneously providing appropriate fltering for any switched current. the use of a sac between the regulation stage and the point of load provides a dual beneft of scaling down series impedance leading back to the source and scaling up shunt capacitance or energy storage as a function of its k factor squared. however, the benefts are not useful if the series impedance of the sac is too high. the impedance of the sac must be low, i.e. well beyond the crossover frequency of the system. a solution for keeping the impedance of the sac low involves switching at a high frequency. this enables small magnetic components because magnetizing currents remain low. small magnetics mean small path lengths for turns. use of low loss core material at high frequencies also reduces core losses. the two main terms of power loss in the bcm module are: n no load power dissipation (p nl ): defned as the power used to power up the module with an enabled powertrain at no load. n resistive loss (p r out ): refers to the power loss across the bcm module modeled as pure resistive impedance. p dissipated = p nl + p r out (10) therefore, p out = p in C p dissipated = p in C p nl C p r out (11) the above relations can be combined to calculate the overall module effciency: h = p out = p in C p nl C p r out (12) p in p in = v in ? i in C p nl C (i out ) 2 ? r out v in ? i in = 1 C (p nl + (i out ) 2 ? r out ) v in ? i in c s sac k = 1/32 vi n v out + ? figure 19 sine amplitude converter? with input capacitor c sac? k = 1/32 s v in out BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 16 of 21 08/2016 800 927.9474 input and output filter design a major advantage of sac? systems versus conventional pwm converters is that the transformers do not require large functional flters. the resonant lc tank, operated at extreme high frequency, is amplitude modulated as a function of input voltage and output current and effciently transfers charge through the isolation transformer. a small amount of capacitance embedded in the input and output stages of the module is suffcient for full functionality and is key to achieve power density. this paradigm shift requires system design to carefully evaluate external flters in order to: 1. guarantee low source impedance: to take full advantage of the bcm modules dynamic response, the impedance presented to its input terminals must be low from dc to approximately 5mhz. the connection of the bus converter module to its power source should be implemented with minimal distribution inductance. if the interconnect inductance exceeds 100nh, the input should be bypassed with a rc damper to retain low source impedance and stable operation. with an interconnect inductance of 200nh, the rc damper may be as high as 1f in series with 0.3 . a single electrolytic or equivalent low-q capacitor may be used in place of the series rc bypass. 2. further reduce input and/or output voltage ripple without sacrifcing dynamic response: given the wide bandwidth of the module, the source response is generally the limiting factor in the overall system response. anomalies in the response of the source will appear at the output of the module multiplied by its k factor. this is illustrated in figures 15 and 16. 3. protect the module from overvoltage transients imposed by the system that would exceed maximum ratings and cause failures: the module input/output voltage ranges shall not be exceeded. an internal overvoltage lockout function prevents operation outside of the normal operating input range. even during this condition, the powertrain is exposed to the applied voltage and power mosfets must withstand it. a criterion for protection is the maximum amount of energy that the input or output switches can tolerate if avalanched. total load capacitance at the output of the bcm module shall not exceed the specifed maximum. owing to the wide bandwidth and low output impedance of the module, low-frequency bypass capacitance and signifcant energy storage may be more densely and effciently provided by adding capacitance at the input of the module. at frequencies <500khz the module appears as an impedance of r out between the source and load. within this frequency range, capacitance at the input appears as effective capacitance on the output per the relationship defned in eq. 13. c out = c in (13) k 2 this enables a reduction in the size and number of capacitors used in a typical system. thermal considerations vi chip ? products are multi-chip modules whose temperature distribution varies greatly for each part number as well as with the input / output conditions, thermal management and environmental conditions. maintaining the top of the BCM352X110Y300B00 case to less than 100oc will keep all junctions within the vi chip module below 125oc for most applications. the percent of total heat dissipated through the top surface versus through the j-lead is entirely dependent on the particular mechanical and thermal environment. the heat dissipated through the top surface is typically 60%. the heat dissipated through the j-lead onto the pcb surface is typically 40%. use 100% top surface dissipation when designing for a conservative cooling solution. it is not recommended to use a vi chip module for an extended period of time at full load without proper heat sinking. BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 17 of 21 08/2016 800 927.9474 bcm ? 1 r 0_1 z in_eq1 z out_eq1 z out_eq2 v out z out_eqn z in_eq2 z in_eqn r 0_2 r 0_n bcm ? 2 bcm ? n load dc v in + figure 20 bcm module array current sharing the performance of the sac? topology is based on effcient transfer of energy through a transformer without the need of closed loop control. for this reason, the transfer characteristic can be approximated by an ideal transformer with a positive temperature coeffcient series resistance. this type of characteristic is close to the impedance characteristic of a dc power distribution system both in dynamic (ac) behavior and for steady state (dc) operation. when multiple bcm modules of a given part number are connected in an array they will inherently share the load current according to the equivalent impedance divider that the system implements from the power source to the point of load. some general recommendations to achieve matched array impedances include: n dedicate common copper planes within the pcb to deliver and return the current to the modules. n provide as symmetric a pcb layout as possible among modules n apply same input / output flters (if present) to each unit. for further details see an:016 using bcm bus converters in high power arrays. fuse selection in order to provide fexibility in confguring power systems vi chip ? modules are not internally fused. input line fusing of vi chip products is recommended at system level to provide thermal protection in case of catastrophic failure. the fuse shall be selected by closely matching system requirements with the following characteristics: n current rating (usually greater than maximum current of bcm module) n maximum voltage rating (usually greater than the maximum possible input voltage) n ambient temperature n nominal melting i 2 t n recommend fuse: 2.5a bussmann pcCtron fuse or 3.15a soc type 36cfa fuse. reverse operation bcm modules are capable of reverse power operation. once the unit is started, energy will be transferred from secondary back to the primary whenever the secondary voltage exceeds v in ? k. the module will continue operation in this fashion for as long as no faults occur. the BCM352X110Y300B00 has not been qualifed for continuous operation in a reverse power condition. furthermore fault protections which help protect the module in forward operation will not fully protect the module in reverse operation. transient operation in reverse is expected in cases where there is signifcant energy storage on the output and transient voltages appear on the input. transient reverse power operation of less than 10ms, 10% duty cycle is permitted and has been qualifed to cover these cases. BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 18 of 21 08/2016 800 927.9474 inch mm no tes: 1. dimensions are . 2. unless ot her wise specified, to lerances are: .x / [.xx] = +/-0.25 / [.01] ; .xx / [.xxx] = +/-0.13 / [.005 ] 3. pr oduct marking on to p surf ac e dxf and pdf files are av ailab le on vicorp ow er .com inch mm no tes: 1. dimensions are . 2. unless ot her wise specified, to lerances are: .x / [.xx] = +/-0.25 / [.01] ; .xx / [.xxx] = +/-0.13 / [.005] 3. pr oduct marking on to p surf ac e dxf and pdf files are av ailab le on vico rp ow er .com inch mm no tes: 1. dimensions are . 2. unless ot her wise specified, to lerances are: .x / [.xx] = +/-0.25 / [.01] ; .xx / [.xxx] = +/-0.13 / [.005 ] 3. pr oduct marking on to p surf ac e dxf and pdf files are av ailab le on vicorp ow er .com inch mm no tes: 1. dimensions are . 2. unless ot her wise specified, to lerances are: .x / [.xx] = +/-0.25 / [.01] ; .xx / [.xxx] = +/-0.13 / [.005] 3. pr oduct marking on to p surf ac e dxf and pdf files are av ailab le on vico rp ow er .com j-lead package recommended land pattern mm (inch) j-lead package mechanical drawing BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 19 of 21 08/2016 800 927.9474 to p view ( component side ) bott om view notes: 1. dimensions are 2. unless other wise specified to lerances are: x.x [x.xx] = 0.25 [0.01]; x.xx [x.xxx] = 0.13 [0.005] 3. rohs compliant per cst- 0001 la test revision dxf and pdf files are available on vicorpower .com inch (mm) . notes: 1. dimensions are 2. unless other wise specified to lerances are: x.x [x.xx] = 0.25 [0.01]; x.xx [x.xxx] = 0.13 [0.005] 3. rohs compliant per cst- 0001 la test revision dxf and pdf files are available on vicorpower .com inch (mm) . recommended hole pattern ( component side shown ) to p view ( component side ) bott om view notes: 1. dimensions are 2. unless other wise specified to lerances are: x.x [x.xx] = 0.25 [0.01]; x.xx [x.xxx] = 0.13 [0.005] 3. rohs compliant per cst- 0001 la test revision dxf and pdf files are available on vicorpower .com inch (mm) . notes: 1. dimensions are 2. unless other wise specified to lerances are: x.x [x.xx] = 0.25 [0.01]; x.xx [x.xxx] = 0.13 [0.005] 3. rohs compliant per cst- 0001 la test revision dxf and pdf files are available on vicorpower .com inch (mm) . recommended hole pattern ( component side shown ) through hole package recommended land pattern mm (inch) through hole package mechanical drawing BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 20 of 21 08/2016 800 927.9474 notes: 1. maintain 3.50 (0.138) dia. keep-out zone free of copper , all pcb layers. 2. (a) minimum recommended pitch is 39.50 (1.555) . this provides 7.00 (0.275) component edge-to-edge spacing, and 0.50 (0.020) clearance between vi cor heat sinks. (b) minimum recommended pitch is 41.00 (1.614) . this provides 8.50 (0.334) component edge-to-edge spacing, and 2.00 (0.079) clearance between vi cor heat sinks. 3. vi chip ? module land pattern shown for referenc e only; actual land pattern may di ff er . dimensions from edges of land pattern to push?pin holes will be the same fo r all full-size vi chip ? products. 4. rohs compliant per cst?0001 latest revision. (no grounding clips) (with grounding clips) 5. unless otherwise specified: dimensions are mm (inches ) tolerances are: x.x (x.xx) = 0.3 (0.01) x.xx (x.xxx) = 0.13 (0.005) 6. plated through holes for grounding clips (33855) shown for reference, heat sink orientation and device pitch will dictate final grounding solution. recommended heat sink push pin location BCM352X110Y300B00
bcm ? bus converter rev 1.2 vicorpower.com page 21 of 21 08/2016 800 927.9474 vicors comprehensive line of power solutions includes high density ac-dc and dc-dc modules and ac - cessory components, fully confgurable ac-dc and dc-dc power supplies, and complete custom power systems. information furnished by vicor is believed to be accurate and reliable. however, no responsibility is assumed by vicor for its use. vicor makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. vicor reserves the right to make changes to any products, specifcations, and product descriptions at any time without notice. information published by vicor has been checked and is believed to be accurate at the time it was printed; however, vicor assumes no responsibility for inaccuracies. testing and other quality controls are used to the extent vicor deems necessary to support vicors product warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. specifcations are subject to change without notice. vicors standard terms and conditions all sales are subject to vicors standard terms and conditions of sale, which are available on vicors webpage or upon request. product warranty in vicors standard terms and conditions of sale, vicor warrants that its products are free from non-conformity to its standard specifcations (the express limited warranty). this warranty is extended only to the original buyer for the period expiring two (2) years after the date of shipment and is not transferable. unless otherwise expressly stated in a written sales agreement signed by a duly authorized vicor signatory, vicor dis - claims all representations, liabilities, and warranties of any kind (whether arising by implication or by operation of law) with respect to the products, including, without limitation, any warranties or representations as to merchantability, fitness for particular purpose, infringement of any patent, copyright, or other intellectual property right, or any other matter. this warranty does not extend to products subjected to misuse, accident, or improper application, maintenance, or storage. vicor shall not be liable for collateral or consequential damage. vicor disclaims any and all liability arising out of the application or use of any product or circuit and assumes no liability for applications assistance or buyer product design. buyers are responsible for their products and applications using vicor products and components. prior to using or distributing any products that include vicor components, buyers should provide adequate design, testing and operat - ing safeguards. vicor will repair or replace defective products in accordance with its own best judgment. for service under this warranty, the buyer must contact vicor to obtain a return material authorization (rma) number and shipping instructions. products returned without prior authorization will be returned to the buyer. the buyer will pay all charges incurred in returning the product to the factory. vicor will pay all reshipment charges if the product was defective within the terms of this warranty. life support policy vicors products are not authorized for use as critical components in life support devices or systems without the express prior written approval of the chief executive officer and general counsel of vicor corporation. as used herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a signifcant injury to the user. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. per vicor terms and conditions of sale, the user of vicor products and components in life support applications assumes all risks of such use and indemnifes vicor against all liability and damages. intellectual property notice vicor and its subsidiaries own intellectual property (including issued u.s. and foreign patents and pending patent applications) relating to the products described in this data sheet. no license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property rights is granted by this document. interested parties should contact vicors intellectual property department. the products described on this data sheet are protected by the following u.s. patents numbers: 5,945,130; 6,403,009; 6,710,257; 6,911,848; 6,930,893; 6,934,166; 6,940,013; 6,969,909; 7,038,917; 7,145,186; 7,166,898; 7,187,263; 7,202,646; 7,361,844; d496,906; d505,114; d506,438; d509,472; and for use under 6,975,098 and 6,984,965. vicor corporation 25 frontage road andover, ma, usa 01810 tel: 800-735-6200 fax: 978-475-6715 email customer service: custserv@vicorpower.com technical support: apps@vicorpower.com BCM352X110Y300B00

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