apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 introduction this easy-to-use kit provides a platform for the evaluation of linear power ampli?ers circuits using the pa94/pa95 pin-out. with ample breadboarding areas it is ?exible enough to analyze a multitude of standard or proprietary circuit con?gurations. criti - cal connections for power supply bypassing, compensation and current limiting are pre-wired. components not usually readily available in engineering labs are provided. external connection to the evaluation kit can be made via the terminals at the edge of the circuit board. these terminal pads are suitable for stan - dard banana jacks or direct soldering of wires. the schematic is shown in figure 1. parts list part # description, vendor quantity hs27 heatsink, apex 1 eval23 pc board, apex 1 tw13 thermal washer, apex 1 box, 10 ea. p6ke440a transzorb, general 2 semiconductor (440v) cdc01 capacitor .01f 1kv, 2 sprague 5gas10 assembly 1. see figures 2 & 3. insert and solder the transzorb diodes at d3 and d4 (440v). 2. insert and solder the disc bypass capacitors at c1 and c2. 3. insert the hs27 heatsink and solder the solderable studs from the opposite side of the pcb. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ???????????????????????????? ???? ? ?? ??? ??? ???? ???? ??? ??? ??? ??? ??? ? ? ??? ? ? ? ? ? ? ? ??? ? ? ? ? ? ?? ?? ?? ? ? ??? ???? ??? ???? ? ? ? ?? ? ?? ? ? ??????? figure 1. figure 1 shows the schematic of the evaluation kit's pre-wired connections. components supplied with the kit are marked with an asterisk (*). see the ampli?ers data sheet for full application information. 4. add banana jacks as necessary to complete connections to external circuits and power supplies. 5. insert the ampli?er into the pcb mounting holes located in the space between the heatsink ?ns. so not solder the pins at this time. 6. hang the tw13 thermal washer near the end of a 6-32 x 3/8" screw. slightly pull the ampli?er away from the heat sink face. use the screw to position the thermal washer behind the ampli?er and insert the screw into the mounting hole of the heatsink. use a 6-32 nut to secure the screw from the opposite side of the heatsink. it is important that the entire back surface of the ampli?ers mounting tab be in contact with the heatsink. adjust the ampli?ers position and tighten the mounting screw as necessary for this to be so. 7. solder the ampli?ers pins to the pcb. 8. add other passive components as necessary to complete your circuit. 9. most common con?gurations will ground the non-invert - ing pin of the ampli?er. j1 is a convenient way to do this if necessary for your application circuit. 10. the four holes at the corners of the circuit board are for mounting #6 standoff spacers if desired. 11. r1-r5 are multiple feedback resistors in series. commonly available resistors do not have a breakdown voltage suf - ?cient to stand off the output voltage of the ampli?er. using multiple resistors will divide down the voltage that each resistor must withstand.
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 figure 2. pcb EK19 evaluation kit for pa94/pa95 pin-out this data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. all speci?cations are subject to change without notice. EK19u rev b october 2004 ? 2004 apex microtechnology corp. ? ???????????? ?????? ?? ???????? ??????????? ???? ???? ?????? ???????????? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? ?? ??? ??? ??? ???? ???? ??? ????? ????? ?? ?? ?? ?? ?? ??? ??? ?? ???? ??? ???????????????????? ?????????? ? ??????????????? ?? ?
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