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| INTRODUCTION This easy-to-use kit provides a platform for the evaluation of linear power amplifiers circuits using the PA91 pin-out. With ample breadboarding areas it is flexible enough to analyze a multitude of standard or proprietary circuit configurations. Critical connections for power supply bypassing, compensation and current limiting are pre-wired. Components not usually readily available in engineering labs are provided. External connection to the evaluation kit can be made via the terminals at the edge of the circuit board. These terminal pads are suitable for standard banana jacks or direct soldering of wires. The schematic is shown in Figure 1. PARTS LIST Part # HS27 EVAL24 TW07 P6KE250A CDC01 Description, Vendor Heatsink, Apex PC Board, Apex Thermal Washer, Apex Transient Zener, Microsemi (250V) Capacitor .01F 1kV, Sprague 5GAS10 Quantity 1 1 1 box, 10 ea. 2 2 ASSEMBLY 1. See Figure 2. Insert and solder the transient zener diodes at D3 and D4 (250V). 2. Insert and solder the disc bypass capacitors at C1 and C2. 3. Insert the HS27 heatsink and solder the solderable studs from the opposite side of the PCB. FIGURE 1. Figure 1 shows the schematic of the evaluation kit's pre-wired connections. Components supplied with the kit are marked with an asterisk (*). See the amplifier's data sheet for full application information. 4. Add banana jacks as necessary to complete connections to external circuits and power supplies. 5. Insert the amplifier into the PCB mounting holes located in the space between the heatsink fins. So not solder the pins at this time. 6. Hang the TW07 thermal washer near the end of a 6-32 X 3/8" screw. Slightly pull the amplifier away from the heat sink face. Use the screw to position the thermal washer behind the amplifier and insert the screw into the mounting hole of the heatsink. Use a 6-32 nut to secure the screw from the opposite side of the heatsink. It is important that the entire back surface of the amplifiers mounting tab be in contact with the heatsink. Adjust the amplifiers position and tighten the mounting screw as necessary for this to be so. 7. Solder the amplifiers pins to the PCB. 8. Add other passive components as necessary to complete your circuit. 9. Most common configurations will ground the non-inverting pin of the amplifier. J1 is a convenient way to do this if necessary for your application circuit. 10. The four holes at the corners of the circuit board are for mounting #6 standoff spacers if desired. 11. R1-R3 are multiple feedback resistors in series. Commonly available resistors do not have a breakdown voltage sufficient to stand off the output voltage of the amplifier. Using multiple resistors will divide down the voltage that each resistor must withstand. APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com 1 EK11 FIGURE 2. PCB EVALUATION KIT FOR PA90, PA91, PA98 PIN-OUT This data sheet has been carefully checked and is believed to be reliable, SHANNON ROAD * is assumed ARIZONA 85741 * USA * APPLICATIONS are subject 1 (800) 546-2739 APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH however, no responsibility TUCSON, for possible inaccuracies or omissions. All specificationsHOTLINE: to change without notice. 2 EK11U REV D OCTOBER 2004 (c) 2004 Apex Microtechnology Corp. |
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