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bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 1 of 11 product grade temperatures (c) grade operating storage t = ?40 to +100 ?40 to +125 m = ?55 to +100 ?65 to +125 baseplate f = slotted flange t = transverse heat sink [a] [a] contact factory bcm tm bus converter product overview vi brick bcm modules use advanced sine amplitude converter tm (sac tm ) technology, thermally enhanced packaging technologies, and advanced cim processes to provide high power density and efficiency, superior transient response, and improved thermal management. these modules can be used to provide an isolated intermediate bus to power non-isolated pol converters and due to the fast response time and low noise of the bcm, capacitance can be reduced or eliminated near the load. applications ? isolated intermediate bus for non-isolated pol ? telecommunication systems ? networking ? servers ? ate ? 100c baseplate operation ? 48 v to 4 v bus converter ? 200 watt (300 watt for 1 ms) ? high density ? up to 65 a/in 3 ? small footprint ? 1.64 and 2.08 in 2 ? height above board ? 0.37 in (9.5 mm) ? low weight ? 1.10 oz (31.3 g) ? zvs / zcs isolated sine amplitude converter ? t ypical efficiency 94% ? <1 s transient response ? >3.5 million hours mtbf ? isolated output ? no output filtering required ? lead free wave solder compatible ? agency approvals features bc 048 a 040 t 020 f p output voltage designator (=v out x10) output power designator (=p out /10) part numbering bus converter module input voltage designator package size pin style p = through hole size: 1.91 x 1.09 x 0.37 in 48,6 x 27,7 x 9,5 mm
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 2 of 11 parameter values unit notes +in to -in -1.0 to 60 vdc +in to -in 100 vdc for 100 ms pc to -in -0.3 to 7.0 vdc +out to -out -0.5 to 12 vdc isolation voltage 2,250 vdc input to output output current 58 a continuous peak output current 75 a for 1 ms output power 200 w continuous peak output power 300 w for 1 ms operating temperature -40 to +100 c t-grade; baseplate -55 to +100 c m-grade ; baseplate storage temperature -40 to +125 c t-grade -65 to +125 c m-grade electrical characteristics apply over the full operating range of input voltage, output load (resistive) and baseplate temperat ure, unless otherwise specified. all temperatures refer to the operating temperature at the center of the baseplate. absolute maximum ratings specifications parameter min typ max unit notes input voltage range 38 48 55 vdc input dv/dt 1 v/s input undervoltage turn-on 37.4 vdc input undervoltage turn-off 32.6 vdc input overvoltage turn-on 55.0 vdc input overvoltage turn-off 59.0 vdc input quiescent current 2.9 ma pc low inrush current overshoot 3.7 a using test circuit in figure 15; see figure 1 input current 4.6 adc input reflected ripple current 114 ma p-p using test circuit in figure 15; see figure 4 no load power dissipation 3.9 4.8 w internal input capacitance 1.9 f internal input inductance 5 nh recommended external input capacitance 47 f 200 nh maximum source inductance; see figure 15 input specifications (conditions are at 48 vin, full load, and 25c ambient unless otherwise specified) note: stresses in excess of the maximum ratings can cause permanent damage to the device. operation of the device is not implied at t hese or any other conditions in excess of those given in the specification. exposure to absolute maximum ratings can adversely affect device reliability.
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 3 of 11 specifications (cont.) figure 3 ? output voltage turn-on waveform with input turn-on at full load and 48 vin figure 4 ? input reflected ripple current at full load and 48 vin input waveforms figure 1 ? inrush transient current at full load and 48 vin with pc enabled figure 2 ? output voltage turn-on waveform with pc enabled at full load and 48 vin
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 4 of 11 parameter min typ max unit note output voltage 3.17 4.58 vdc no load 2.99 4.42 vdc full load output power 0 200 w 44 - 55 v in 0 172 w 38 - 55 v in rated dc current 0 58 adc p out 200 w peak repetitive power 300 w max pulse width 1ms, max duty cycle 10%, baseline power 50% current share accuracy 5 10 % see parallel operation on page 8 efficiency half load 93.8 94.8 % see figure 5 full load 93.5 94.5 % see figure 5 internal output inductance 1.1 nh internal output capacitance 255 f effective value load capacitance 9,100 f output overvoltage setpoint 4.6 vdc output ripple voltage no external bypass 216 305 mvp-p see figures 7 and 9 47 f bypass capacitor 8 mvp-p see figure 8 short circuit protection set point 59.8 adc module will shut down average short circuit current 0.77 a effective switching frequency 2.40 2.55 2.70 mhz fixed, 1.3 mhz per phase line regulation k 0.0825 1/12 0.0842 v out = k?v in at no load load regulation r out 2.8 3.6 m transient response voltage overshoot 110 mv 100% load step; see figures 10 and 11 response time 200 ns see figures 10 and 11 recovery time 1 s see figures 10 and 11 output overshoot input turn-on 0 mv no output filter; see figure 3 pc enable 0 mv no output filter; see figure 2 output turn-on delay from application of power 215 ms no output filter; see figure 3 from release of pc pin 75 ms no output filter output specifications (conditions are at 48 vin, full load, and 25c ambient unless otherwise specified) specifications (cont.) efficiency vs. output power 82 84 86 88 90 92 94 96 0 20 40 60 80 100 120 140 160 180 200 output power (w) efficiency (%) figure 5 ? efficiency vs. output power power dissipation 2 4 6 8 10 12 14 0 20 40 60 80 100 120 140 160 180 200 output power (w) power dissipation (w) figure 6 ? power dissipation as a function of output power output waveforms
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 5 of 11 specifications (cont.) output waveforms figure 8 ? output voltage ripple at full load and 48 vin with 47 f ceramic external bypass capacitor and 20 nh of distribution inductance. figure 7 ? output voltage ripple at full load and 48 vin without any external bypass capacitor. ripple vs. output power 80 100 120 140 160 180 200 220 0 20 40 60 80 100 120 140 160 180 200 output power (w) output ripple (mvpk-pk) figure 9 ? output voltage ripple vs. output power at 48 vin without any external bypass capacitor. figure 10 ? 0 -50 a load step with 100 f input capacitor and no output capacitor. figure 11 ? 50- 0 a load step with 100 f input capacitor and no output capacitor.
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 6 of 11 specifications (cont.) parameter min typ max unit notes mtbf mil-hdbk-217f 3.5 mhrs 25c, gb isolation specifications voltage 2,250 vdc input to output capacitance 3,000 pf input to output resistance 10 m input to output agency approvals ctvus ul /csa 60950-1, en 60950-1 ce mark low voltage directive rohs mechanical see mechanical drawings, figure 18, 19 weight 1.10/31,3 oz /g dimensions length 1.91/ 48,6 in / mm baseplate model width 1.09/ 27,7 in / mm baseplate model height 0.37/ 9,5 in / mm baseplate model thermal over temperature shutdown 125 130 135 c junction temperature thermal capacity 23.8 ws /c baseplate to ambient 7.7 c / w baseplate to ambient; 1000 lfm 2.9 c / w baseplate to sink; flat greased surface 0.40 c / w baseplate to sink; thermal pad 0.36 c / w general specifications parameter min typ max unit notes primary control (pc) dc voltage 4.8 5.0 5.2 vdc module disable voltage 2.4 2.5 vdc module enable voltage 2.5 2.6 vdc current limit 2.4 2.5 2.9 ma source only enable delay time 75 ms disable delay time 30 s see figure 12, time from pc low to output low auxiliary pins figure 12 ? v out at full load vs. pc disable figure 13 ? pc signal during fault
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 7 of 11 +in / -in ? dc voltage input ports the vi brick (bcm) input voltage range should not be exceeded. an internal under / over voltage lockout function prevents operation outside of the normal operating input range. the bcm turns on within an input voltage window bounded by the ?input undervoltage turn-on? and ?input overvoltage turn-off? levels, as specified. the bcm may be protected against accidental application of a reverse input voltage by the addition of a rectifier in series with the positive input, or a reverse rectifier in shunt with the positive input located on the load side of the input fuse. the connection of the bcm to its power source should be implemented with minimal distribution inductance. if the interconnect inductance exceeds 100 nh, the input should be bypassed with a rc damper to retain low source impedance and stable operation. with an interconnect inductance of 200 nh, the rc damper may be 47 f in series with 0.3 . a single electrolytic or equivalent low-q capacitor may be used in place of the series rc bypass. pc ? primary control the primary control port is a multifunction node that provides the following functions: enable / disable ? if the pc port is left floating, the bcm output is enabled. once this port is pulled lower than 2.4 vdc with respect to ?in, the output is disabled. this action can be realized by employing a relay, opto-coupler, or open collector transistor. refer to figures 1-3, 12 and 13 for the typical enable / disable characteristics. this port should not be toggled at a rate higher than 1 hz. the pc port should also not be driven by or pulled up to an external voltage source. primary auxiliary supply ? the pc port can source up to 2.4 ma at 5.0 vdc. the pc port should never be used to sink current. alarm ? the bcm contains circuitry that monitors output overload, input overvoltage or undervoltage, and internal junction temperatures. in re sponse to an abnormal condition in any of the monitored parameters, the pc port will toggle. refer to figure 13 for pc alarm characteristics. tm and rsv ? reserved for factory use. +out / -out ? dc voltage output ports two sets of contacts are provided for the +out port. they must be connected in parallel with low interconnect resistance. similarly, two sets of contacts are provided for the ?out port. they must be connected in parallel with low interconnect resistance. within the specified operating range, the average output voltage is defined by the level 1 dc behavioral model of figure 16. the current source capability of the bcm is rated in the specifications section of this document. the low output impedance of the bcm reduces or eliminates the need for limited life aluminum electrolytic or tantalum capacitors at the input of pol converters. total load capacitance at the output of the bcm should not exceed the specified maximum. owing to the wide bandwidth and low output impedance of the bcm, low frequency bypass capacitance and significant energy storage may be more densely and efficiently provided by adding capacitance at the input of the bcm. pin / control functions figure 14 ? vi brick bcm pin configuration (viewed from pin side)
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 8 of 11 load + + r2 2 k d1 sw1 enable/disable switch input reflected ripple measurement point bcm tm rsv pc +in +out -out +out -out -in figure 15 ? vi brick bcm test circuit 6a [a] fuse c1 47 f electrolytic c3 47 f r3 10 m notes: 1. source inductance should be no more than 200 nh. if source inductance is greater than 200 nh, additional bypass capacitance may be required. 2. c3 should be placed close to the load. 3. r3 may be esr of c3 or a separate damping resistor. 4. d1 power good indicator will dim when a module fault is detected. [a] see input fuse recommendations section f1 application notes and test circuit parallel operation the bcm will inherently current share when operated in an array. arrays may be used for higher power or redundancy in an application. current sharing accuracy is maximized when the source and load impedance presented to each bcm within an array are equal. the recommended method to achieve matched impedances is to dedicate common copper planes within the pcb to deliver and return the current to the array, rather than rely upon traces of varying lengths. in typical applications the current being delivered to the load is larger than that sourced from the input, allowing traces to be utilized on the input side if necessary. the use of dedicated power planes is, however, preferable. the bcm power train and control architecture allow bi-directional power transfer, including reverse power processing from the bcm output to its input. reverse power transfer is enabled if the bcm input is within its operating range and the bcm is ot herwise enabled. the bcm?s ability to process power in reverse improves the bcm transient response to an output load dump. input impedance recommendation s to take full advantage of the bcm capabilities, the impedance presented to its input terminals must be low from dc to approximately 5 mhz. the source should exhibit low inductance (less than 100 nh) and should have a critically damped response. if the interconnect inductance exceeds 100 nh, the bcm input pins should be bypassed with an rc damper (e.g., 47 f in series with 0.3 ) to retain low source impedance and stable operations. given the wide bandwidth of the bcm, 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 bcm multiplied by its k factor. the dc resistance of the source should be kept as low as possible to minimize voltage deviations. this is especially important if the bcm is operated near low or high line as the over/under voltage detection circuitry could be activated. input fuse recommendations vi bricks are not internally fused in order to provide flexibility in configuring power systems. however, input line fusing of vi bricks must always be incorporated within the power system. a fast acting fuse should be placed in series with the +in port. for agency approvals and fusing conditions, click on the link below: http://www.vicorpower.com/technical_library/technical_documentation/quality_and _certification/safety_approvals/ application notes for bcm and vi brick application notes on soldering, board layout, and system design please click on the link below: http://www.vicorpower.com/technical_library/application_information/ applications assistance please contact vicor applications engineering for assistance, 1-800-927-9474, or email at apps@vicorpower.com.
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 9 of 11 behavioral models l in = 5 nh + C + C v out c out v in v ? i k + C + C c in i out r c out i q r out r c in 1.9 f 1.3 m 81 ma 1/12 ? iout 1/12 ? vin 0.96 m 2.8 m 0.7 m 255 f lout = 1.11 nh i q + ? + v out v in v ? i k + C + C i out r out C vi brick bus converter level 1 dc behavioral model for 48 v to 4 v, 200 w vi brick bus converter level 2 transient behavioral model for 48 v to 4 v, 200 w figure 16 ? this model characterizes the dc operation of the vi brick bus converter, including the converter transfer function and its lo sses. the model enables estimates or simulations of output voltage as a function of input voltage and output load, as well as total converter p ower dissipation or heat gen- eration. figure 17 ? this model characterizes the ac operation of the vi brick bus converter including response to output load or input voltage tr ansients or steady state modulations. the model enables estimates or simulations of input and output voltages under transient conditions, i ncluding response to a stepped load with or without external filtering elements. ? ? 81 ma 1/12 ? iout 1/12 ? vin 2.8 m 0.23 nh i q + ? + v out v in v ? i k + C + C i out r out C
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 page 10 of 11 figure 18 ? module outline figure 19 ? pcb mounting specifications mechanical drawings recommended pcb pattern (component side shown) baseplate - slotted flange heat sink (transverse)
bus converter module BC048A040T020FP vicorpower.com rev. 1.0 3/08 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 warranty vicor products are guaranteed for two years from date of shipment against defects in material or workmanship when in normal use and service. this warranty does not extend to products subjected to misuse, accident, or improper application or maintenance. vicor shall not be liable for collateral or consequential da mage. this warranty is extended to the original purchaser only. except for the foregoing express warranty, vicor makes no warranty, express or implied, including, but not limited to, the warranty of merchantability or fitness for a particular purpose. vicor will repair or replace defective products in accordance with its own best judgement. for service under this warranty, the buyer must contact vicor to obtain a return material authorization (rma) number and shipping instructions. pr oducts 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. information published by vicor has been carefully checked and is believed to be accurate; however, no responsibility is assumed for inaccuracies. vicor reserves the right to make changes to any products without further notice to improve reliability, function, or design. vicor does not assume any liability arising out of the application or use of any product or circuit; neither does it convey any license under its patent rights nor the rights of others. vicor general policy does not recommend the use of its components in life support applications wherein a failure or malfunction may directly threaten life or injury. per vicor terms and conditions of sale, the user of vicor components in life support applications assumes all risks of such use and indemnifies vicor against all damages. vicor?s comprehensive line of power solutions includes high density ac-dc and dc-dc modules and accessory components, fully configurable 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 components are not designed to be used in applications, such as life support systems, wherein a failure or malfunction could result in injury or death. all sales are subject to vicor?s terms and conditions of sale, which are available upon request. specifications are subject to change without notice. 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. interested parties should contact vicor's intel- lectual 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; 7,166,898; 7,187,263; 7,361,844; d496,906; d505,114; d506,438; d509,472; and for use under 6,975,098 and 6,984,965

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