apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 preliminary introduction the EK60 evaluation kit is designed to provide a convenient way to breadboard design ideas for the pa78eu power opera - tional ampli?ers. the eval60 evaluation board is pre-wired for all required and recommended external components including the ones for power supply bypassing, compensation and cur - rent limiting. the eval60 also includes a breadboard area for constructing your application circuit with provisions for a pre- ampli?er to drive the pa78 inputs. parts list apex part # description quantity hs27 heatsink, apex 1 eval60 pc board, apex 1 tw12 thermal washer, apex 1 box ox7r105kwn 1 uf cap 3530b105k501n 2 novacap, 200v breakdown 140-500n5-330j 33pf cap cdr-500n5-330ks 1 xicon 146510cj bnc connector 3 ms02 socket strip 1 bag ms11 socket strip 1 bag EK60 schematic ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??????????????????????????????? ???? ? ? ???? ? ? ? ? ? ? ? ? ? ? ? ? ? ??? ? ? ? ? ??? ? ? ? ?? ??? ??? ? ? ?? ? ?? ? ?? ?? ?? ? ? ? ?? ? ? ?? ?? ? ? ?? ??? ??? ?? ? ?? ? ? ?? ??? ? ??? ? ? ? ? ? ? ? ? ? ?? ?? ?? ?????? ? ? ? ? ? ? ? ? ?? ? ? ?? ? ? ? ? ?? ? ?????????????????????????????????????????????? ????????????????????????????????????????? ????????????????????????????????????????? ? ? assembly during assembly refer to figure 1 and figure 2. 1. solder surface mount ceramic capacitors c4 and c5 on the dut side of the board. 2. add components for compensation (cc-, cc+, rc- and rc+) based on the closed loop gain and capacitive load. add the current limit resistor (rlim) based on load requirements (a minimum value of 4.5 ohms should be used to protect the pa78 internal output devices). it is recommended to use mso2 sockets for the components for quick component changes on the board. add 33pf capacitor (ct) between dut pins 3 and 5. 3. while developing your application circuit you will probably want to use the mating socket strip. use the ms11 socket strip for mounting the pa78 eu. clip off the strip after the 12th position. insert the strip into the circuit board on the dut side and solder one pin on the reverse side. check whether the mating socket strip is fully seated against the circuit board and then solder the remaining pins. insert the ampli?er fully into the socket strip, noting the pin 1 location on the ampli?er and the circuit board. 4. for high power applications (see pa78eu datasheet for soa considerations) mount the heat sink (hs27) in the outlined area on the circuit board. 5. if a heat sink is used, position the thermal washer behind the ampli?er in such a way that the hole on the washer coincides with the hole on the tab and the heat sink. 6. for high slew rate performance connect the heat tab to a stable reference (see pa78u datasheet for details). 7. install the banana jacks for p1 (+vs), p2 (-vs) and p3 (gnd) as shown in ?gure 1 and 2. there are provisions for two extra banana jacks (p4 and p5) and can be used if desired for external connections.
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 preliminary evaluation kit for pa78 pin-out EK60 ???? ???? ???????? ??????????? figure 1: pcb layout
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 preliminary evaluation kit for pa78 pin-out EK60 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. EK60u rev 3 january 2006 ? 2006 apex microtechnology corp. figure 2: assembled pcb
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