EK17 Apex Microtechnology

CIRCUIT DUT SIDE EVAL19 EK17 Evaluation Kit APPLICABLE PARTS (SOLD SEPARATELY) SA12 PWM Amplifier INTRODUCTION This easy-to-use kit provides a platform for the evaluation of PWM amplifiers using the SA12 pin-out con- figuration. It can be used to analyze a multitude of standard or proprietary circuit configurations, and is flexi- ble enough to do most standard amplifier test configurations. The schematic is shown in Figure 2. Note that all of the components shown on the schematic will proba- bly not be used for any single circuit. Some components will simply be omitted, while others require installa- tion 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 4 must be obtained locally. Figure 1: PCB TOP SIDE TB1 PWR +Vs B OUT A OUT Vcc GND M I C R O T E C H N O L O G Y EVAL19 R 7 12 COMPONENT SIDE + Rb + Ra IC R1 R2 4.686 CVs3 Vcc SIG GND 1 6 C3 J1 IC R3 SIG C2 GND C1 R4 D1 RAMP/-PWM OR SIG SPARE SPARE SHDN FLAG +PWM GND 5.500 BOTTOM SIDE Apex Microtechnology Inc. Jan 2016 www.apexanalog.com All rights reserved EK17U Rev I CVs2 CVs1 CVcc 1 6EK17 Figure 2: PCB Schematic A block diagram of the SA12 is shown in Figure 2 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 connec- tions. 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 sepa- rated and tie together only at the ground pin (5). A breadboarding area is supplied which can accommodate 1 or 2 IC amplifiers and associated components. The large terminal pads can be used to solder wire connections or banana jacks. 2 EK17U Rev I