EK65

EK65 Evaluation Kit APPLICABLE PARTS (SOLD SEPARATELY) • MP400FC INTRODUCTION The EK65 Evaluation kit is designed to provide a convenient way to breadboard and evaluate design ideas for the MP400FC power operational amplifier. The evaluation board is pre-wired for all required external components. The evaluation board has been laid out and labeled to easily configure the high voltage operational amplifier in a non-inverting differential configuration for single supply operation using the MP400FC boost supply (Refer to Application Note 21). However, the evaluation board is flexible enough to analyze a multitude of standard or proprietary circuit configurations. Figure 1: EK65 Schematic www.apexanalog.com © Apex Microtechnology Inc. All rights reserved Dec 2015 EK65U Rev D EK65 Figure 2: PCB Layout 5.50 BJ5 BJ6 TOP VIEW Lf Cb2 Cb3 Ro1 Ro2 Ro3 Cs 20 Rs C1 Rtrim Rset Rf+ HS mounting holes Ro4 Cb4 Vboost J1 Rb1 1 42 + AGND +Vs Rcl Cb1 Rf- + + + Out AGND 4.61 Cc+ AGND Vin BJ4 PGND BJ3 Input J2 + Cin BJ2 PGND Vin BN1 Non-inverting configuration BJ1 shown Rin+ Rb2 Single supply configuration Rin- IC1 Cc- 21 AGND Do not connect AGND & PGND. See datasheet EVAL65 REV Component Side BOTTOM VIEW 2 EK65U Rev D EK65 REQUIRED COMPONENTS (NOT INCLUDED WITH KIT) Reference Cin Function Capacitor, Low ESR electrolytic, 100µF or greater with voltage rating greater then the anticipated input voltage. Cb1-4 Cboost capacitor, Low ESR electrolytic with voltage rating greater then the anticipated boost voltage. Refer to the MP400FC data sheet for Cboost selection. One 120µF, 400V electrolytic capacitor (Cb1) is supplied with the kit and is adequate for most applications. The value of Cboost is selected to meet required boost supply ripple voltage specifications for the application and to minimize switching noise on the boost supply. Cboost will be as large as reasonably possible, in the range of 100µF to 500µF. An area on the evaluation board large enough for 4 parallel 22mm diameter capacitors is provided. This allows maximum flexibility in the select of the capacitors for Cboost. Capacitors with snap in terminals should still be soldered to the evaluation board to minimize resistance. Rset Boost voltage programming resistor. Refer to the MP400FC data sheet for calculation of Rset. Select a higher standard value resistor and use Rtrim (supplied) to calibrate the boost voltage to the exact desired value. Alternatively, Rtrim can be used alone for a fully adjustable boost supply. Rcl Operational amplifier current limit resistor. Refer to the MP400FC data sheet for selection of the current limit resistor. OPTIONAL COMPONENTS (NOT INCLUDED WITH KIT) Reference Function Lf Boost supply filter inductor. The MP400FC includes a 47µH inductor in series with the LFin pin and the +Vs supply of the high voltage op amp. This on board inductor forms a 2 pole LC filter with C1 and an on board parallel 0.1µF capacitor. Combined with a properly selected Cboost, the high voltage DC boost voltage will be sufficiently clean for most applications. However, an external inductor between Vboost and LFin, or Vboost and +Vs can be used for additional filtering of the Boost supply voltage if necessary. Additional capacitance can be added to the filter between +Vs and AGND. Cs, Rs Also useful for boost supply filtering. These components form an RC snubber from drain to source of the boost supply MOSFET switch. This snubber will help reduce or eliminate overshoot and ringing of the MOSFET switch at switch turn-off that can appear on the boost supply voltage. The component values shown on the schematic are adequate for most applications but can be adjusted for your specific application. The power in the resistor can be estimated by the formula PD = F*C*V2, where F = 100 kHz C = the value of Cs V = the anticipated Vboost voltage. Rs must be non-inductive. MP900 and MP9000 series resistors from Caddock Electronics or equivalent resistors can be used. Rs may require a heat sink such as Apex part number HS28 or HS23 (Not included). Mounting holes for a heat sink are provided on the evaluation board that will accommodate either of these heat sinks. Cc+, Cc- EK65U Rev D High voltage op amp compensation capacitors. Refer to the MP400FC data sheet for component selection. 3 EK65 Ro1-4, Rf+, Rf-, Ri+, Ri- Op amp gain setting and input bias resistors used for the single supply differential configuration described in applications note 21. Appendix A of apps note 21 provides a procedure for the design of the differential configuration and selection of these components. Apps note 21 can be down loaded from the Apex web site. The locations on the board for Ro1-4 are large enough for up to a 3W resistor. 3W 1% resistor style CPF from Vishay Dale are widely available through distribution. RN60, RN65 or RN70 style 1/2W 1% resistors can be used for the other resistors. PARTS LIST Reference Manufacturer Part # Description/Vendor HS26 Heat Sink 1 MS11 Strip of 30 cage jacks 2 EVAL65 PC board 1 93505A430 Hex standoff, 4-40x1/4 4 90272A105 Screw, 4-40x3/16 4 BJ1-6 571-0100 Banana Jack, PC 6 BN1 146510CJ BNC, PC mount 1 C1 ZX7R105KTL Cap. 1 µF, 500V Novacap ST2225B105K501LLXW 1 Cb1 EKMQ401VSN121MP30S Cap. 120µF, 400V 1 Rtrim T93YA203KT20 Trim Pot, 20K 1 QTY BEFORE YOU GET STARTED • • • • • • • • • Please read this data sheet in it’s entirety before starting to construct your evaluation board. All APEX amplifiers should be handled using proper ESD precautions. Do not change connections while the circuit is powered. Initially set all power supplies to the minimum operating voltage allowed in the device data sheet. The MP400FC is a high voltage amplifier with an integrated switch mode power supply. Though the input voltage will be 50V or less, the MP400FC can generate voltages greater then 350V. The high generated voltage will be present on the evaluation board. Caution must be used when working with the evaluation board. Always use the heatsink provided n this kit. Always use adequate power supply bypassing. Check for oscillations. Please refer to Application Note 1, AN01 for general operating considerations. ASSEMBLY During assembly, refer to Figure 1, Figure 2 and the MP400FC data sheet. 1. Note that the silk screen side of the circuit board is labeled as the “component side”. The other side of the circuit board will be referred to in these instructions as the “DUT side” of the board. 2. The Analog ground AGND and power ground PGND are clearly labeled on the boards. All components for the on board boost supply are referenced to PGND, and all components for the high voltage op amp are referenced to AGND. The board has been designed to keep switching currents from the boost supply out of the analog ground. AGND and PGND are common at only one point on the MP400, and are not connected at all on the evaluation board. To avoid ground loops and switching currents in the analog ground, 4 EK65U Rev D EK65 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. avoid making any connections between these two ground references at the board level. Note the dashed line on the component side of the board showing the dividing line between the analog ground side of the board and the power ground side. Cut one of the MS11 strips to a length of 20 cage jacks and the other MS11 to a length of 22 cage jacks. From the DUT side of the board, insert the strips into the appropriate row of holes for the DUT pins. On the component side of the board, solder all cage jacks having solder pads (pins 3, 5, 7, 9, 11, and 16 have no solder pads). Make sure the cage jacks are fully seated before soldering. Be careful that solder does not flow into the cage jacks. Remove the unsoldered cage jacks with the carrier strip segments. Solder the ZX7R105KTL surface mount capacitor at C1 on the component side of the board. Insert BJ1 – BJ6 from the component side of the board as desired for your application. The banana jack locations are labeled with the associated input or output. BJ1 is provided for use as an input for a negative bias supply voltage to –Vs for bipolar supply operation. It also could be used as an alternative to the BNC connector for the input signal or other inputs to your application circuit. If you do not anticipate using BJ1 it should be left off. Solder the banana jacks to the board from the DUT side. Insert the BNC connector BN1 from the component side of the board. Solder to the board from the DUT side. BN1 can be left off if you do not intend to use it for an input to your circuit. Select and insert Rset from the component side of the board at the location shown near pin 34 of the DUT and solder from the DUT side. Rtrim may be installed for calibration of the boost supply voltage or as an alternative to Rset. If installed as shown on the board with the knob toward Cin, a CW turn will increase Vboost and a CCW turn will decrease Vboost. Select and insert Rcl from the component side at the location marked for Rcl between pins 1 and 2 of the DUT. Solder from the DUT side. Select and insert other components as required for your application. J1 is required to supply Vboost to the high voltage op amp through the on board 47µH filter inductor. Vboost can be jumpered to the +Vs pin if the filter is not to be used. Alternatives are to replace the jumper with an external inductor between the Vboost pin and the LFin or +Vs. A filter capacitor can be added between the +Vs and AGND. You may want to start with J1 as shown and try other options as you are evaluating your design. J2 is required to connect the high voltage op amp –Vs to AGND for single supply operation. If an external negative supply voltage will be used, replace J2 with a high quality ceramic bypass capacitor of at least 1µF, and jumper –Vs to BJ1. BJ1 can be used to connect the negative supply to the evaluation board. Rin+ and Rin- when installed as marked on the component side of the board near BJ1 and BN1, will configure the op amp in the non-inverting configuration with Rin- to AGND and Rin+ to the input BNC. For an inverting configuration, rotate Rin+ to AGND and Rin- to the input. If the snubber Cs and Rs will be used, select and insert the components at the location marked near DUT pins 12 – 15. If the calculated power dissipation indicates that a heat sink is required for Rs, install it with Rs. Cs and Rs can be installed after you have started evaluating your design if they are found to be needed. Vin power can be supplied to your circuitry in the breadboard area. There are two pads located below the breadboard area near BN1. One labeled Vin and one labeled PGND can be jumpered into your circuit as needed. Mount the electrolytic capacitors at Cin, and Cboost from the component side of the PCB. Match the polarity markings on the PCB. Solder from the DUT side of the PCB. Be sure to fill the holes with solder. Apply a thin, uniform layer of thermal grease to the back side of the MP400FC. Position the amplifier over the mounting holes of the HS26 heat sink. Firmly push the amplifier onto the heat sink while slightly rotating the amplifier back and forth, ending with the mounting holes of the amplifier over the mounting holes in the heat sink. EK65U Rev D 5 EK65 16. Attach the amplifier to the heat sink with the supplied 4-40 x 1/4” male-female hex spacer. Tighten with a hex nut driver. Make sure the hex spacers are snug but do not over tighten as this provides no benefit and may break the hardware. 17. Carefully lower the PCB assemblies onto the heat sink/amplifier assembly until the pins of the amplifier engage in and are fully seated in the cage jacks aligning the mounting holes in the PCB to the hex spacers. Use the supplied 4-40 x 3/16” screws to attach the PCB assembly to the hex spacers. 18. Hook up power and signals as necessary. The amplifier is now ready for testing. Figure 3: Assembly NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. 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PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK. Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnology, Inc. All other corporate names noted herein may be trademarks of their respective holders. 6 EK65U Rev D