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| INTRODUCTION The EK60 evaluation kit is designed to provide a convenient way to breadboard design ideas for the PA78EU power operational amplifiers. The EVAL60 evaluation board is pre-wired for all required and recommended external components including the ones for power supply bypassing, compensation and current limiting. The EVAL60 also includes a breadboard area for constructing your application circuit with provisions for a preamplifier to drive the PA78 inputs. ASSEMBLY During assembly refer to Figure 1 and Figure 2. 1. Solder surface mount ceramic capacitors C4 and C5 on the DUT side of the board. 2. Add components for compensation (CC-, CC+, RC- and RC+) based on the closed loop gain and capacitive load. Add the current limit resistor (RLIM) based on load requirements (a minimum value of 4.5 ohms should be used to protect the PA78 internal output devices). It is recommended to use MSO2 sockets for the components for quick component changes on the board. Add 33pF capacitor (CT) between DUT pins 3 and 5. 3. While developing your application circuit you will probably want to use the mating socket strip. Use the MS11 socket strip for mounting the PA78 EU. Clip off the strip after the 12th position. Insert the strip into the circuit board on the DUT side and solder one pin on the reverse side. Check whether the mating socket strip is fully seated against the circuit board and then solder the remaining pins. Insert the amplifier fully into the socket strip, noting the pin 1 location on the amplifier and the circuit board. 4. For high power applications (see PA78EU datasheet for SOA considerations) mount the heat sink (HS27) in the outlined area on the circuit board. 5. If a heat sink is used, position the thermal washer behind the amplifier in such a way that the hole on the washer coincides with the hole on the tab and the heat sink. 6. For high slew rate performance connect the heat tab to a stable reference (see PA78U datasheet for details). 7. Install the banana jacks for P1 (+Vs), P2 (-Vs) and P3 (GND) as shown in figure 1 and 2. There are provisions for two extra banana jacks (P4 and P5) and can be used if desired for external connections. PARTS LIST Apex Part # HS27 EVAL60 TW12 OX7R105KWN Description Heatsink, Apex PC Board, Apex Thermal Washer, Apex 1 uF Cap 3530B105K501N Novacap, 200V Breakdown 140-500N5-330J 33pF Cap CDR-500N5-330KS XICON 146510CJ BNC Connector MS02 Socket Strip MS11 Socket Strip Quantity 1 1 1 Box 2 1 3 1 bag 1 bag EK60 SCHEMATIC R P L E M I I A N Y R APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com 1 EK60 EVALUATION KIT FOR PA78 PIN-OUT Figure 1: PCB Layout P 2 E R IM L I A N Y R APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 EVALUATION KIT FOR PA78 PIN-OUT EK60 Figure 2: Assembled PCB R P L E M I I A N Y R This MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX is assumed for possible inaccuracies or omissions. All specifications prodlit@apexmicrotech.com APEXdata sheet has been carefully checked and is believed to be reliable, however, no responsibility(520) 888-3329 * ORDERS (520) 690-8601 * EMAIL are subject to change without notice. EK60U REV 3 JANUARY 2006 (c) 2006 Apex Microtechnology Corp. 3 |
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