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 pa97 pin-out. with ample breadboarding areas it is ?exible enough to analyze a multitude of standard or proprietary circuit con?gurations. critical connections for power supply bypassing 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 standard banana jacks or direct soldering of wires. the schematic is shown in figure 1. parts list part # description, vendor quantity eval23 pc board, apex 1 p6ke440a transzorb, general 2 semiconductor (440v) cdc01 capacitor .01f 1kv, 2 sprague 5gas10 assembly 1. see figure 1. insert and solder the transzorb diodes at d3 and d4 (440v). 2. insert and solder the disc bypass capacitors at c1 and c2. 3. jumper r lim and r c note that heatsink hs28 is not used. 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 (not used) and solder pins. 6. add other passive components as necessary to complete your circuit. 7. most common con?gurations will ground the non-inverting pin of the ampli?er. j1 is a convenient way to do this if necessary for your application circuit. 8. the four holes at the corners of the circuit board are for mounting #6 standoff spacers if desired. 9. 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. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??????????????????????? ???? ? ?? ??? ??? ???? ???? ??? ??? ??? ??? ??? ? ? ? ? ? ? ? ? ??? ? ? ? ? ? ?? ?? ?? ??? ???? ??? ???? ? ? ? ?? ?? ? ? ???? 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?er's data sheet for full applica - tion information.
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 EK28 evaluation kit for pa97 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. EK28u rev b october 2004 ? 2004 apex microtechnology corp. figure 2. pcb
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