ug:104 vicorpower.com applications engineering: 800 927.9474 page 1 features n oscilloscope probe jack for output voltage and ripple measurements n simple to use n ring lug or solder connections n parallelable introduction the customer evaluation board ofers a convenient means to evaluate the performance of vicors intermediate bus converter (ibc) and has been optimized for user convenience. refer to the appropriate ibc data sheet for performance and operating limits. the data sheets are available for downloading at vicorpower.com . it is important to remember the fast response of the ibc can readily show the limitations of the source, load, and associated wiring connected to the evaluation board. care should be exercised to minimize stray source and load impedances in order to fully exercise the ibc. please refer to figure 1 for locations of the input and output connections as viewed from the component side. wires may be soldered directly to the pads instead of ring lugs if desired to minimize circuit impedances. vi brick ? ibc customer evaluation board user guide | ug:104 written by: michael degaetano associate product line engineer april 2012 contents page features 1 introduction 1 set up 3 recommended 5 hardware thermals 5 ordering info 5
ug:104 vicorpower.com applications engineering: 800 927.9474 page 2 figure 1. ibc customer evaluation board layout drawing, component side c1 8 j1 0 s0 2 s0 1 jp 02 jp 01 j1 1 tp14 c1 7 c1 6 c1 2 c1 3 c1 0 c1 5 fi d0 1 fi d0 2 l10 vi brick ibc r1 0 r1 2 r1 1 r1 3 s10 tp12 tp19 tp13 tp21 tp31 tp27 tp33 q1 0 tp29 c14 c1 1 tp23 tp25 1 2 3 4 +out +i n -i n -out figure 2. ibc customer evaluation board schematic c15 10 f 25 v c14 0.1 f 50 v +out Cout +inm en c1 6 c1 7 2.2 f 100 v +i n 2 1 4 3 en en_ext_in Cinm Cin en l10 190 h 20 a Cinm +out Cout Ci n j10 gn d j1 1 r1 0 47.5 k r1 1 r1 2 47.5 k vi brick ibc s10 0 c11 4.7 nf 1k v c10 4.7 nf 1k v c13 4.7 nf 1k v c12 4.7 nf 1k v s01 s02 r13 q10 c1 8 33 f 80 v
ug:104 vicorpower.com applications engineering: 800 927.9474 page 3 set up the customer evaluation board should be set up as follows: note: care should be taken to avoid reversing polarities if connecting to the opposite (solder) side of the board. +in, Cin connect a high-quality, low-noise power supply to the +in and Cin terminals of the customer evaluation board. the start up slew rate of the input source should be no greater than 1 v/s. the interconnect leads should be heavy gauge and as short as possible. additional capacitance may have to be added on the evaluation board to make up for impedances in the interconnect leads as well as defciencies in the source. it is important to remember that noise from the source, as well as any input source voltage drops, will appear at the output of the ibc multiplied by its k factor. +out, Cout an electronic or passive load should be connected to +out and Cout terminals of the customer evaluation board with short heavy-gauge leads. most commercially available electronic loads do not have current slew rates capable of fully exercising the ibc. the customer evaluation board can be connected directly to the application for which the ibc is intended. however, the interconnect impedances between the customer evaluation board and the application can greatly afect the transient response. for applications where transient response is critical, the user should consider mounting the ibc directly to the target application pcb. en control the ibc customer evaluation board provides two methods to enable and disable the ibc. for the frst method, the ibc is enabled and disabled solely with the s10 switch. no connection to the j11 header should be made. flipping s10 toward the outside perimeter enables the ibc. flipping s10 toward the inside area disables the ibc. for the second method, the ibc is enabled and disabled solely with the j11 header. the s10 switch should be fxed in the inside position. application of 5 v or more between en_ext_in and Cinm, pins numbered 1 and 3 respectively, is sufcient to enable the ibc. application of less than 1 v between said pins is sufcient to disable the ibc. gnd the gnd terminal of the customer evaluation board is provided for basic emi testing of the ibc, during which it should be connected to earth ground. locations s01 & s02 are provided to shunt the common-mode choke if desired. zero ohm resistors are placed in these locations for this purpose. output voltage measurement jack (j10) this connector is provided to make accurate measurements of the output voltage of the ibc. many types of scope probes may be directly connected to this point if the probe is equipped with a removable plastic sheath. to avoid creating ground loops when making measurements of the output or input voltage, these measurements should be made separately.
ug:104 vicorpower.com applications engineering: 800 927.9474 page 4 paralleling the paralleling and current sharing capability of the devices can be demonstrated by stacking multiple customer evaluation boards and interconnecting the inputs and outputs with standofs of sufcient current handling capability to create a 3-dimensional array. see figure 3 below. when paralleling ibcs the en control header (j11) should not be used. the modules should be enabled with the s10 switch. pre-enabling all modules before input power is applied does not guarantee a synchronous startup. therefore, the load at startup must be sized so that any one module is able to successfully startup into that load alone. input current measurement a current probe can be passed around the +in lead connected to the ibc. input capacitors on the customer evaluation board are downstream of this measurement point. effciency measurement as the ibc can deliver and consume large currents, the efect of the pcb must be considered when making an efciency measurement. be certain to accurately measure the voltage directly at the ibc using the appropriate pair of contact points located at the corners of the ibc. figure 3. paralleling connections of two ibc customer evaluation boards +in +out Cin Cout
vicorpower.com applications engineering: 800 735.6200 rev 1.4 page 5 recommended hardware: qty description manufacturer p/n vicor p/n 4 ring lug panduit lcas6-10-l 4 #10-32 screw 4 #10 fat washer 4 #10 lock washer kit # 37324 4 #10 hex nut 4 self-adhesive rubber feet rubber feet can be placed on bottom side of pcb at pad locations 1 through 4. all hardware is stainless steel except the ring lug. kit # 37324 is included with the customer evaluation board. thermals for most lab environments a fan blowing across the evaluation board with at least 200 lfm is recommended. for additional thermal information regarding the ibc refer to the data sheet or contact vicor applications engineering for assistance (800) 927-9474. caution the ibc and customer evaluation board can comfortably operate at surface temperatures which may pose a thermal hazard to the operator. be careful not to touch any exposed surface. ibcs may operate at potentially dangerous voltages and pose an energy hazard. the customer evaluation board is not intended for use in end item equipment. ordering information the customer evaluation board is specifed by replacing the C00 sufx with Ccb to the appropriate ibc model number. see: http://www.vicorpower.com/dc-dc-converters-board-mount/vi-brick-intermediate- bus-conver for model number listings. the power behind performance 6/2013
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