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 pwm ampli?ers using the sa12 pin-out con?guration. it can be used to analyze a multitude of standard or proprietary circuit con?gurations, and is ?exible enough to do most standard ampli?er test con?gurations. the schematic is shown in figure 3. note that all of the components shown on the schematic will probably not be used for any single circuit. some components will simply be omitted, while others require installation of a jumper to complete the signal path. only components unique to the EK17 are provided in this kit. hardware similar to that shown in figure 1 must be obtained locally. before you get started * all apex ampli?ers should be handled using proper esd precautions. * always use the heatsink included in this kit with tw05 washer. * always use adequate power supply bypassing. * do not change connections while the circuit is powered. * initially set all power supplies to the minimum operating al - lowed in the device data sheet. parts list apex part # description quantity hs18 heatsink 1 ms04 pc mount cage jacks 1 bag/12 each eval19 pc board 1 60spg00001 spacer grommets 4 tw05 thermal washer 1 box/10 each ox7r105kwn 1f cap 1825b105k201n, 3 novacap ts01 terminal strip 66505 1 beau interconnect ec03 680 f cap 1 united chemi-con kmh200vn68im25x40t2 hs22 heatsink 2 thermolly 6025b csr03 0.01 ohm resistor 2 caddock mp916-0.010 - 5% csr04 0.020 ohm resistor 2 caddock mp930-0.020 - 5% figure 1. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????????????????? ????
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 evaluation kit for sa12 pwm amplifier EK17 assembly during assembly refer to figures 1 & 2 1. from the dut of the pcb insert and solder the 12 cage jacks. also solder the cage jacks from the circuit side as well, making sure the cage jack remains ?ush with the component side of the pcb. 2. solder the 3 surface mount ceramic capacitors to the component side of the pcb. 3. from the component side of the pcb insert the terminal strip. solder from the circuit side of the pcb. be sure that the gnd terminal hole in the pcb is fully ?lled with solder. 4. two values of current limiting power resistors are supplied. select one value (see the ampli?er data sheet to learn how to calculate which resistor will suit your need). coat the backside of the power resistor with heat sink compound (not supplied). using 4-40 screws and nuts (not supplied) mount the resistors to the two small heat sinks supplied. solder the resistor/heat sink assembly to the component side of the pcb. 5. insert the electrolytic capacitor into the pcb from the component side and solder from the circuit side making sure to ?ll the mounting holes with solder. 6. from the circuit side, push spacer grommets into pcb until fully seated. grommets will snug when screws are inserted for heatsink mounting. 7. apply tw05 thermal washer to the bottom of the ampli?er. 8. use #14 sleeving to insulate and align at least 2 opposite pins of the ampli - ?er. 9. mount ampli?er to heatsink using #6 screws and nuts. torque the part to the speci?ed 8 to 10 in-lbs (.9 to 1.13 n*m). do not over torque. 10. install components as needed. ex - ternal connections may be soldered directly or standard banana jacks may be soldered to the large pads at the edge of the pcb. 11. insert ampli?er pins into cage jacks and fasten pcb to heatsink. ?????? ???????????????? ? ? ?????????????? ?????????? ??? ? ?? ?? ?? ?? ??? ?? ?? ??? ???? ???? ?? ?? ???? ???? ??? ??? ??? ????? ???? ???? ? ????? ??? ??? ????? ????? ??? ??? ??? ????????? ?? ?? ?? ?? ???? ??? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ?? ???????? ??????????? ????? ????? figure 2. pcb
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 figure 3. pcb schematic. a block diagram of the sa12 is shown in figure 3 along with pcb connections of all the commonly used external components. your application circuit will not use all of the components. add those components required by your circuit. you may have to jumper some components to make the desired electrical connections. j1 is an optional way to connect the clock circuit. power supply bypassing is particularly important and that is why high quality ceramic chip capacitors are supplied with the kit. in addition, a large electrolytic capacitor is included. this capacitor was selected expressly for this evaluation kit and may not be (and likely won't be) suitable for your end application. you will need to select an electrolytic capacitor based on your analysis of the capacitor's ripple current, ripple current tolerance, operating temperature, operating voltage, acceptable service life and acceptable supply ripple. note that the signal ground and power ground are separated and tie together only at the ground pin (5). a breadboarding area is supplied which can accomodate 1 or 2 ic ampli?ers and associated components. the large terminal pads can be used to solder wire connec - tions or bannana jacks. evaluation kit for sa12 pwm amplifier EK17 ???? ???? ? ? ? ? ? ? ?? ?? ?? ? ? ? ??? ??? ??? ??? ????????? ?? ???? ? ??? ????? ?? ?? ?? ?? ?? ?? ?????? ??????? ????? ??? ?? ??? ????? ????? ??? ???? ????? ????? ????? ??? ???? ????????? ????????? ? ?????? ?????? ?? ?? ?? ???? ?????? ?? ??? ??? ??? ?? ?????? ??? ??? ?? ??? ????? ????? ?? ??? ? ??? ????? ??? ????? ??
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 figure 4. functional test circuit the schematic of figure 4 can be used to verify the func - tionality of your ampli?er and help you gain a familiarity with proper operation. at either a out or b out, with respect to ground, you should observe a square wave approximately 30 v in amplitude with a ?xed frequency and duty cycle that varies from approximately 0 to 100% at a rate of 1 hz. the current limit is set to 10 amps. ???? ?????? ??????? ????? ???? ??? ?? ???? ??? ??? ??? ??? ????????? ?? ???????? ? ??? ????? ?? ????? ?? ????? ?? ???? ?????????????? ????????????????? ?????????????? ??? ????? ?? ??? ?? ????? ? ??? ????? ??????????????? ?? ?????? ??? ??? ?? ??? ????? ?? ??? ??? ??? ????? ????? ??? ???? ????????? ????????? ?? ?? ?? ? ? ? ????? ??? ???? ????? ?????????? ?? ??????? ?? ?? ?? ?? ???? ??? ?????? ??????????????? ?? ??????? ???????? ??? ?????? ??? ?????? ?????? ?? ?? ?? ? ? ? ? ? ? evaluation kit for sa12 pwm amplifier EK17 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. EK17u rev f february 2005 ? 2005 apex microtechnology corp.
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