picor corporation ? www.picorpower.com QPI-12-CB1 data sheet rev. 1.0 page 1 of 6 introduction the QPI-12-CB1 carrier board is an evaluation board platform designed to demonstrate the emi capabilities of a qpi-12lz filter, with any combination of 48 v input prm / vtm or bcm evaluation boards. the QPI-12-CB1 board includes a pre-mounted filter along with some additional components necessary to demonstrate the full functionality of the filter, along with mounting areas for v ? i chip evaluation boards. this user?s guide provides basic instructions for assembly and use of the board. further information on the functionality of the v ? i chip boards, as well as the qpi-12lz can be found in the v ? i chip evaluation board user?s guide as well as the v ? i chip and qpi-12lz data sheets. qpi-12lz product description the qpi-12lz emi filter is specifically designed to attenuate conducted common-mode (cm) and differential-mode (dm) noise of vicor?s v ? i chip products to comply with the cispr22 standard requirements for conducted noise measurements. the filter is designed to operate up to 80 vdc continuous, with a 100 vdc surge for 100 ms, and supports 7 a loads up to 60c without derating. designed for the telecom bus range, the v ? i chip emi filter supports the picmg ? 3.0 specification for filtering system boards to the en55022 class b limits. QPI-12-CB1 quietpower ? qpi-12lz filter carrier board for 48 v v ? i chip emi evaluation ? contents introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1 board overview . . . . . . . . . . . . . . . . . . . . . . . . page 2 bill of materials . . . . . . . . . . . . . . . . . . . . . . . . page 2 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 board assembly . . . . . . . . . . . . . . . . . . . . . . . . page 3 v ? i chip mounting configurations . . . . . . . . . page 3 emi bypass configurations. . . . . . . . . . . . . . . . page 4 emi performance and test set up . . . . . . . . . . page 4 typical emi performance . . . . . . . . . . . . . . . . . page 5 mechanical drawings . . . . . . . . . . . . . . . . . . . . page 6 ordering information . . . . . . . . . . . . . . . . . . . page 6 additional resources . . . . . . . . . . . . . . . . . . . . page 6 QPI-12-CB1 carrier board featuring the qpi-12lz emi filter
picor corporation ? www.picorpower.com QPI-12-CB1 data sheet rev. 1.0 page 2 of 6 c1 qpi-12lz c2 shield connection cy5 ?cy10 for bcm placement for vtm placement for prm placement plac ement figure 1 ? QPI-12-CB1 board overview shield c2 2.2 uf vin+ vin- shield bus- 1 shield 2 shield 3 emi- 4 emi- 5 emi+ 6 emi+ 7 bus+ 8 bus+ 9 bus- 10 qpi-12lz vin- vin+ +in -in 47 uf c1 vin-a vin+a prm+ 1 bcm+ 2 bcm- 3 prm- 4 vtm_in+ 5 vtm_in- 8 vtm_out+ 6 vtm_out- 7 carrier cy1 4.7 nf cy2 4.7 nf cy3 4.7nf cy4 4.7 nf cy5 4.7 nf cy6 4.7 nf cy7 4.7 nf cy8 4.7 nf cy9 4.7 nf cy10 4.7 nf vtm_in+ vtm_in- vtm_out- vtm_out+ vout- vout+ 1 2 jvin+ 1 2 jvin- 1 2 3 jvout+ 1 2 3 jvout- vtm_out+ vtm_out- 1 2 3 jbcm- 1 2 3 jbcm+ vtm_in+ vtm_in- figure 2 ? QPI-12-CB1 carrier board schematic bill of materials ref designator description qpi qpi-12lz sip ci capacitor, electrolytic, 47 uf, 100 v c2 capacitor, ceramic, 2.2 uf, 100 v cy5 thru cy10 capacitor, x7r ceramic, 4.7 nf, 1,000 v hardware machine screw, pan head, 0.373", 1/2" long, #10-24 thread hardware machine nut, hex, 3/8", #10-24 thread cy1 thru cy4 optional y-cap configuration (not populated) as noted above : cy1 thru cy4 not populated.
picor corporation ? www.picorpower.com QPI-12-CB1 data sheet rev. 1.0 page 3 of 6 board assembly the v ? i chip evaluation boards should be attached to the carrier board using the hardware provided. begin by removing the top nuts from the bolts in the space provided for mounting the evaluation board. check to see that the lower bolts are tightened. remove rubber spacers from the v ? i chip evaluation board(s). place the v ? i chip evaluation board on the bolts. make sure that the evaluation board is placed in the proper input to output orientation with respect to the carrier board (the input side will have the capacitor). replace the top nuts and tighten gently with a wrench. attach input and output leads, be careful to confirm proper polarity before powering up. when using the carrier board pay special attention to the wiring and grounding. wires should be kept as short as possible and positioned to minimize radiated noise pick-up on the qpi-12lz. figure 3 ? side view hardware assembly figure 4 ? QPI-12-CB1 carrier board assembled with prm and vtm evaluation boards figure 5 ? QPI-12-CB1 carrier board assembled with bcm evaluation board
picor corporation ? www.picorpower.com QPI-12-CB1 data sheet rev. 1.0 page 4 of 6 emi bypass configurations emi bypass capacitors (?y? capacitors) are an essential element in a switch-mode dc-dc filter application as these capacitors provide a return path for common- mode noise currents to their source; so careful attention to bypass capacitor implementation is essential for a successful emi filter design. this carrier board is preconfigured in a ?base-plate? emi topology, which uses six ?y? capacitors (only four are actually used in a bcm configuration), as illustrated in figure 7 below. this is the preferred topology for vi chip applications. the carrier board can be manually reconfigured to an ?open frame? topology, which uses four ?y? caps in a prm/vtm combination (two for a bcm), as shown in figure 8. the open-frame approach may attenuate certain load dependent noise better than the base-plate method. the carrier board provides an ideal test vehicle for making a comparison between the two ?y? capacitor configurations. to reconfigure to ?open frame? carefully remove capacitors cy5 through cy10 and place four of those six capacitors in the positions marked as cy1 through cy4. emi performance and test set up the emi plots in figures 9 through 14 are the total noise measurements, on both the positive and negative lines of the qpi-12lz with various v ? i chip configurations, bus+ qpi+ bus- qpi- shield qpi vin+ vout+ vin- vout- prm vin+ vout+ vin- vout- vtm cy5 cy6 cy9 cy7 cy10 cy8 c1 47 uf lisn lisn pcb plane under converter ~1.25 m shielded box shield plane (earth ground) pcb board bus supply figure 7 ? basic emi measurement setup for ?base-plate? configuration. bus+ qpi+ bus- qpi- shield qpi vin+ vout+ vin- vout- prm vin+ vout+ vin- vout- vtm cy3 cy1 cy4 cy2 c1 47 uf lisn lisn pcb plane under converter ~1.25 m shielded box shield plane (earth ground) pcb board bus supply figure 8 ? basic emi measurement setup for ?open-frame? configuration. using the basic base-plate standard ?y? cap configuration. figure 7 shows the basic emi measurement set up that was used to achieve these results. figure 8 shows the alternate set up method when converting to the open-frame approach. in figure 7 (base-plate method), capacitors cy5 through cy10 represent the recirculation capacitors that are connected to each of the four input and output terminals, then are commoned to a shield plane that has been created underneath the converter. since the prm/ vtm pair is similar to a conventional converter, which is split into to halves, two additional ?y? caps (cy7 and cy9) were added to the prm?s output (the input to the vtm), referenced to the shield plane. in figure 8 (open-frame method), four ?y? capacitors are used (cy1 through cy4) rather than the two ?y? caps that a conventional converter would require, once again because of the topology split created by the pair. in a bcm application there is no topology split so the set up would require two fewer capacitors for either configuration. the open-frame method would only need one pair of input an output caps, referenced to the shield plane on either side of the bcm. and for open- frame method a pair of ?y? caps across the positive input to positive output, and negative input and negative output would be sufficient.
picor corporation ? www.picorpower.com QPI-12-CB1 data sheet rev. 1.0 page 5 of 6 figure 9 ? total noise qpi-12lz* with 48 v input prm and 3v output vtm. 3.27 a input current. 160 w output load. figure 12 ? total noise qpi-12lz* with 48 v input, 3 v output bcm. 3.18 a input current. 160 w output load. figure 10 ? total noise qpi-12lz* with 48 v input prm and 12 v output vtm. 4.03 a input current. 180 w output load. figure 13 ? total noise qpi-12lz* with 48 v input, 12 v output bcm. 3.75 a input current. 180 w output load. figure 11 ? total noise qpi-12lz* with 48 v input prm and 48 v output vtm. 3.45 a input current. 160 w output load. * these emi plots are actually based on qpi-10lz, which includes the same filter elements but includes integrated hot-swap. figure 14 ? total noise qpi-12lz* with 48 v input, 48 v output bcm. 3.20 a input current. 153 w output load.
picor corporation ? www.picorpower.com QPI-12-CB1 data sheet rev. 1.0 page 6 of 6 5/08 plane vout- vout+ bcm+ bcm- vin+ vin- 5/07 revc +in +in -in -in bcm prm vtm qpi / v?chip carrier board for qpi-11 or qpi-12 filter models reorder # qpi-xx-cb1* * xx indicates model c2 vin+ d l e i h s - n i v c1 cy1 cy2 cy3 cy4 cy5 cy6 cy7 cy8 cy9 cy10 vout+ vout- carrier 0.000 0.650 0.850 1.050 2.050 2.150 2.250 3.200 2.800 0.400 0.000 0.385 0.850 1.050 1.250 1.950 2.150 2.350 2.815 3.200 0.000 0.250 0.850 5.100 5.600 7.200 7.950 2.500 0.000 2.435 4.585 qpi-12lz figure 17 ? mechanical drawing for QPI-12-CB1 carrier board part number compatible v?i chip evaluation boards (sold separately)* QPI-12-CB1 prms : p048f048t12al-cb, p048f048t24al-cb, p048f048t17al-cb, p048f048t32al-cb, vtms: all 48 v input models bcms : all 48 v input models ordering information * some v?i chip products exceed the current rating and therefore may not be compatible when operating at full load additional resources online qpi-12lz data sheet http://vicorpower.com/picorpower/data_sheets/#input_filters v?i chip data sheets and user guides http://vicorpower.com/products/vichip/
|
