introduction this easy-to-use kit provides a platform for the evaluation of pwm circuits using the msa240kc/260kc pin out. with ample bread boarding 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 terminal block and banana jacks at the edges of the circuit board. before you get started ? all apex ampli?ers should be handled using proper esd precautions. ? do not change connections while the circuit is powered. ? initially set all power supplies to the minimum operating voltage allowed in the device data sheet. parts list ref apex part no. description/vendor qty na hs28 heat sink/apex 2 na hs26 heat sink/apex 1 na ms11 30-pin socket carrier strip 2 na eval56 pc board 1 na 60spg00004 spacer grommets/ 4 micro plastics bj1-4 bj1 banana jack/ 4 deltron 164-6218 c1,3 zx7r105ktl 1uf 500v cap/ novacap st2225b105k501llxw 2 for identi?cation note this capacitor has legs. c2* ec05 2200uf 100v/ 1 united chemi-con 82da222m100kc2d c2* ec06 470uf 450v/ 1 united chemi-con kmh450vn471m35x50t2 ts1 ts02 terminal strip 1 r1,2* csr22 0.020? resistor/ 2 isotek pbv-r020-1 r1,2* csr20 0.010? resistor/ 2 isotek pbv-r010-1 r1,2* csr21 0.015? resistor/2 isotek pbv-r015-1 *chosen per directions assembly during assembly refer to figure 1 and the data sheet for the product you are using, either the msa240kc or msa260kc. 1. note that each side of the circuit board is identi?ed as either the component side or "dut side". 2. two 30-pin socket strips have been supplied with this kit that have been loaded with cage jacks. using wire cutters trim the carrier to remove two sockets from one of the strips. insert the socket strips from the "dut side" of the board and solder the jacks from the "component side" of the board, making sure that each socket strip is fully seated before soldering. after soldering the jacks remove and discard the plastic carrier. 3. solder the surface mount capacitors at c1 and c3 on the "component side" of the board. 4. from the "component side" mount banana jacks at bj1-4 and solder from the "dut side" of the circuit board. cut off excess lead lengths. note that bj1 is connected to sig gnd. 5. several low ohm value resistors are provided with this evalu - ation kit: 0.020?, 0.015? and 0.010?. these are used to implement current limiting in the output circuit. select the value most appropriate for your application. refer to the product data sheet to determine which resistor value you should use. 6. from the "component side" of the pcb mount the hs28 heat sink closest to c2 (to be added later) and solder the mounting tabs of the heat sink from the "dut side" with a high capacity soldering iron. 7. apply a thin layer of thermal grease on the back of the chosen current limiting sense resistor r2 and insert the resistor into the pcb. mount the resistor to the hs28 heat sink using #4 screw and nut hardware (not supplied). place the screw into the mounting hole from the narrow-channel side of the heat sink and place the nut on the screw from the wide-channel side of the heat sink. do not over tighten the screw. finally, solder the resistor terminals to the pcb and cut off the excess lead length . 8. mount the remaining hs28 heat sink similarly to step 6. 9. repeat step 7 for r1 and the second hs28 heat sink. 10. mount the electrolytic capacitor at c2 from the "compo - nent side" of the pcb. match the polarity markings on the capacitor with the polarity markings on the pcb. use the correct voltage capacitors for the product you are using: a 100v capacitor for the msa240kc, or a 450v capacitor for the msa260kc. be sure the capacitors have snapped into the pcb and solder from the "dut side" of the pcb. be sure to ?ll the holes with solder. 11. mount the terminal strip to the "component side" of the pcb. make sure the terminal strip is fully seated and solder the pins from the "dut side" of the pcb. be sure to ?ll the mounting holes with solder. 12. mount a bnc connector (not supplied) to the pcb at loca - tion 5 (near the banana jacks) if desired. the body of the bnc connector is tied to sig gnd. 13. mount other components to complete your application circuit using the pads and holes provided. refer to the data sheet for your model and note on page 4 that: r ramp = 2 x r osc it is therefore convenient to use 3 resistors of equal value and make up r ramp from two of those resistors. note on the pcb locations for r ramp1 and r ramp2 to do this. apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????????????????????????? ????
14. from the "dut side" of the pcb snap the spacer- grom - mets into the holes at the four corners of the pcb. notice that the holes are slightly rectangular and match the spacer- grommet's long and short sides to the holes in the pcb. 15. apply a thin, uniform layer of thermal grease to the ampli?er; a straight edge may be useful here. position the ampli?er over the mounting holes in the heatsink. firmly push the ampli?er onto the heatsink while slightly rotating the ampli - ?er back and forth, ending with the mounting holes of the ampli?er over the mounting holes in the heatsink. 16. attach the ampli?er to the heatsink with 4-40x? male- female hex spacers (not supplied). these spacers serve as alignment pins and aide in the assembly of the pcb to the heatsink. alternatively, use 4-40x? machine screws to mount the ampli?er to the heatsink. do not over-tighten the spacers or screws as this provides no thermal bene?t and may break the hardware. 17. place the pcb assembly on the heatsink/ampli?er assembly so that the hex spacers come through the aligning holes near the corners of the ampli?er location in the pcb. care - fully lower the pcb assembly until the pins of the ampli?er engage the cage jacks. alternately, sight through the align - ing holes in the pcb and match-up the pcb to the screws used to mount the ampli?er. in either case be sure the pins of the ampli?er are engaged with the cage jacks and then continue pushing the pcb assembly in the area between the ampli?ers pins until the four spacer grommets at the four corners of the pcb touch the heatsink. at this point the pcb should not be bowed. 18. using #8 x 1" sheet metal screws (not provided) mount the pcb to the heat sink at the four spacer-grommets. 19. hook up power and signals as necessary. the ampli?er is now ready for testing. figure 1: schematic diagram assembly cont. ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? ? ? ? ? ? ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? ? ??? ? ? ??? ????? ??? ????? ????????? ??? ??? ?????????????? ????? ? ??????????? ?? ? ?????? ????? ? ?????? ???? ??????? ????????? ?????? ??????? ?? ?? ?? ?? ?? ?? ?? ??????? ?? ?? ?? ???? ?? ?? ?? ?? ?? ??????? ???????????? ??????? ?? ??????? ?? ?? ?? ?? ???? ? ?? ????????? ??? ??? ??? ????? ??? ????? ??? ?? ?? ?? ?? ?? ?? ?? ?? ? ? ? ? ? ? ???????????????????????? ??????????? ???????????????????????????????????? ??????? ?? ?? ????????????????????????????????????????????????????????? ??? ??? ??? ??? ??? ??? ??? ????????????????????????????? ?????????????????????????????????? ? ????? ? ????? ?????? ?????? ??? apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 evaluation kit for msa240kc & msa260kc EK56
figure 2: apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 evaluation kit for msa240kc & msa260kc EK56 ????? ??? ? ????? ??? ? ???????? ??????????? ???????? ??? ????????? ? ????????????? ? ??????????????? ?? ??? ??????? ??????? ???????? ? ?? ? ?? ? ?? ? ?? ? ?? ? ??? ??? ?? ? ????? ????? ?? ? ?? ??? ?? ? ??? ??? ? ???? ??? ?? ? ???? ? ???? ? ??? ?? ? ?? ?? ? ??????? ?? ? ??? ?? ?? ?? ?? ??????????? ? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? ?????? ? ??????? ??????? ??????????????????????? ?????? ? ?? ???????????? ? ????? ????? ?? ? ?? ? ???? ????
figure 3: ????????????? ?????????????? ???????? ???????????????? ?????????????? ?????????? ?????????????? ???????? ???????????? ?????????????????? ????????????? ???????????????????????????????? ?????????????????? ?????????????? ??????????? ?????????????? ????????????????? ?????????????????????? apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 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. EK56u rev i december 2004 ? 2004 apex microtechnology corp. evaluation kit for msa240kc & msa260kc EK56
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