EK15

EK15 EK15 nnoovvaa t i o n FFr roomm P EK15 r o d u c t IInnSA08 Evaluation Kit for SA08 Pin-Out INTRODUCTION PARTS LIST This easy-to-use kit provides a platform for the evaluation of PWM amplifiers using the SA08 pin-out configuration. It can be used to analyze a multitude of standard or proprietary circuit configurations, and is flexible enough to do most standard amplifier test configurations. 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 EK15 are provided in this kit. Hardware similar to that shown in Figure 1 must be obtained locally. Apex Part # HS18 MS04 EVAL19 60SPG00001 TW05 ZX7R105KTL OX7R105KWN TS01 EC01 HS22 CSR03 CSR04 BEFORE YOU GET STARTED * All Apex Precision Power amplifiers 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 levels allowed in the device data sheet. * Check for oscillations. Description Quantity Heatsink 1 PC mount Cage Jacks 1 Bag/12 each PC Board 1 Spacer Grommets 4 Thermal Washer 1 Box/10 each 1µF Cap ST2225B105K501LLXW 2 Novacap 1µF Cap 1825B105K201N, 1 Novacap Terminal Strip 66505 1 Beau Interconnect 470 µf Cap 1 United Chemi-Con 82DA471M500MG2D Heatsink 2 Thermolly 6025B 0.010 ohm resistor 2 Caddock MP916-0.010 - 5% 0.020 ohm resistor 2 Caddock MP930-0.020 - 5% FIGURE 1. EK15U http://www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MAY 20091 APEX − EK15UREVC EK15 M I C R O T E C H N O L O G Y EVAL19 R-C COMPONENT SIDE + PWR GND + B OUT +Vs A OUT Vcc 12 7 Rb Ra R1 IC CVs1 CVs3 4.686 CVcc CVs2 R2 Vcc SIG GND R3 D1 SHDN SIG GND 1 6 C3 J1 C2 IC C1 RAMP/-PWM OR FLAG SIG GND R4 SPARE +PWM SPARE 5.500 BOTTOM SIDE 6 2 TB1 CIRCUIT DUT SIDE EVAL19 During assembly refer to Figure 1 and Figure 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 flush 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 filled with solder. 4. Two values of current limiting power resistors are supplied. Select one value (see the amplifier 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 fill 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 amplifier. 8. Use #14 sleeving to insulate and align at least 2 opposite pins of the amplifier. 9. Mount amplifier to heatsink using #6 screws and nuts. Torque the part to the specified 8 to 10 in-lbs (.9 to 1.13 N*M). Do not over torque. 10. Install components as needed. External connections may be soldered directly or standard banana jacks may be soldered to the large pads at the edge of the PCB. 11. Insert amplifier pins into cage jacks and fasten PCB to heatsink. FIGURE 2. PCB TOP SIDE 1 ASSEMBLY P r o d u c t I n n o v a t i o nF r o m EK15U EK15 P r o d u c t I n n o v a t i o nF r o m A block diagram of the SA08 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 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 amplifiers and associated components. The large terminal pads can be used to solder wire connections or bannana jacks. The schematic of Figure 3 can be used to verify the functionality of your amplifier 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 fixed frequency and duty cycle that varies from approximately 0 to 100% at a rate of 1 Hz. The current limit is set to 2 amps. FIGURE 3. FUNCTIONAL TEST CIRCUIT 50 OHM 25 WATT DUMMY LOAD Vcc Vcc A OUT + Vs B OUT CVcc 1µF FIGURE 3. PCB SCHEMATIC. A OUT 30V HIGH AMP SUPPLY 15V 200 mA SUPPLY CVs1-3 Ra .1 OHM B OUT + Vs Rb .1 OHM R1 5k R2 5k CVcc CVs1-3 12 R1 R2 12 11 I SENSE A 10 8 9 Vcc A OUT 10V 1000pf 5V Vcc 910 H BRIDGE DRIVER .01µF SA08 Vcc 910 50 50k 50 10V 50k I SENSE B B OUT 10V 10V 1000pf 7 + Vs 5V I SENSE B .1V 1k 8 9 Vcc A OUT I SENSE A 1k .1V 10 7 B OUT + Vs 11 H BRIDGE DRIVER Ra 10V .01µF 5V SA08 TL 56k f/2 470pF 5V 56k 5V TL CLOCK 10V f/2 470pF 5V CLK IN 1 CLOCK CLK IN 2 + PWM 3 J1 CLK OUT 2 1 CLK OUT + PWM 3 C1 J1 4 GND 5 GND ILim/SHDN FLAG 5 4 C1 .01µF FLAG ILim/SHDN 6 C3 .1µF 5K 6 C2 D1 50 C3 R3 +PWM R4 +PWM EK15U D1 RAMP/-PWM OR FLAG SIG GND PWR GND ILIM/SHDN RAMP/-PWM OR FLAG SIG GND PWR GND ILIM/SHDN 1 Hz SDNE WAVE +3/+7 V AMPLITUDE VALLEY TO PEAK 3 EK15 P r o d u c t I n n o v a t i o nF r o m Contacting Cirrus Logic Support For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@cirrus.com. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. 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