EPC9078

Development Board EPC9078 Quick Start Guide EPC2045 100 V Half-bridge with Gate Drive, Using EPC2045 QUICK START GUIDE EPC9078 DESCRIPTION The EPC9078 development board is a 100 V maximum device voltage, 20 A maximum output current, half bridge with onboard gate drives, featuring the EPC2045 enhancement mode (eGaN®) field effect transistor (FET). The purpose of this development board is to simplify the evaluation process of the EPC2045 eGaN FET by including all the critical components on a single board that can be easily connected into any existing converter. The EPC9078 development board is 2” x 2” and contains two EPC2045 eGaN FETs in a half bridge configuration using the Texas Instruments LM5113 gate driver. The board also contains all critical components and layout for optimal switching performance. There are also various probe points to facilitate simple waveform measurement and efficiency calculation. A block diagram of the circuit is given in figure 1. For more information on the EPC2045 please refer to the datasheet available from EPC at www.epc-co.com. The datasheet should be read in conjunction with this quick start guide. Table 1: Performance Summary (TA = 25°C) EPC9078 Symbol Parameter VDD Gate Drive Input Supply Range VIN Bus Input Voltage Range(1) IOUT Switch Node Output Current VPWM Conditions Min Max Units 7.5 12 V 80 V 20 A 6 1.5 V V (2) PWM Logic Input Voltage Input ‘High’ Threshold Input ‘Low’ Minimum ‘High’ State Input VPWM rise and Pulse Width fall time < 10ns Minimum ‘Low’ State Input Pulse VPWM rise and Width (3) fall time < 10ns 3.5 0 50 ns 200 ns (1) Maximum input voltage depends on inductive loading, maximum switch node ringing must be kept under 100 V for EPC2045. (2) Maximum current depends on die temperature – actual maximum current with be subject to switching frequency, bus voltage and thermal cooling. (3) Limited by time needed to ‘refresh’ high side bootstrap supply voltage. QUICK START PROCEDURE Development board EPC9078 is easy to set up to evaluate the performance of two EPC2045 eGaN FETs. Refer to figure 2 for proper connect and measurement setup and follow the procedure below: 1. With power off, connect the input power supply bus to +VIN (J5, J6) and ground / return to –VIN (J7, J8). 2. With power off, connect the switch node (SW) of the half bridge OUT (J3, J4) to your circuit as required (half bridge configuration). The EPC9078 features an optional buck converter configuration, as shown in figure 2, with unpopulated footprints for an output inductor and output capacitors. 3. With power off, connect the gate drive input to +VDD (J1, Pin-1) and ground return to –VDD (J1, Pin-2). 4. With power off, connect the input PWM control signal to PWM (J2, Pin-1) and ground return to any of the remaining J2 pins. 5. Turn on the gate drive supply – make sure the supply is between 7.5 V and 12 V range. EPC9078 development board 6. Turn on the controller / PWM input source. 7. Turn on the bus voltage to the required value (do not exceed the absolute maximum voltage) and probe switching node to see switching operation. 8. Once operational, adjust the PWM control, bus voltage, and load within the operating range and observe the output switching behavior, efficiency and other parameters. 9. For shutdown, please follow steps in reverse. 2 | NOTE. When measuring the high frequency content switch node, care must be taken to provide an accurate high speed measurement. An optional two pin header (J10) is included for switch node measurement. It is recommended to install measurement point on backside of board to prevent contamination of the top side components. For information about measurement techniques, please review the how to GaN series: HTG09- Measurement http://epc-co.com/epc/DesignSupport/TrainingVideos/HowtoGaN/ | EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017 QUICK START GUIDE EPC9078 VDD Gate drive regulator Logic and dead-time adjust PWM input Half bridge with bypass capacitors Gate drive supply VIN LM5113 gate driver VOUT Figure 1: Block diagram of EPC9078 development board – + VIN V – + A Switch node I IN External circuit VIN supply + – – Optional output capacitor pads Half bridge configuration – + (For efficiency measurement) Optional 2-pin header for switch node measurement Optional inductor pads + Gate drive supply VDD supply (note polarity) 7.5 V – 12 V + PWM input – External load Optional buck configuration Figure 2: Proper connection and measurement setup 10 V/div 20 ns/div VIN = 48 V, VOUT = 1.8 V, IOUT = 10 A, fSW = 500 kHz Figure 3: Typical Waveform for VIN = 48 V to 1.8 VOUT, 10 A (500 kHz) Buck Converter EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017 | | 3 QUICK START GUIDE EPC9078 THERMAL CONSIDERATIONS The EPC9078 development board showcases the EPC2045 eGaN FET. The EPC9078 is intended for bench evaluation with low ambient temperature and convection cooling. The addition of heat-sinking and forced air cooling can significantly increase the current rating of these devices, but care must be taken to not exceed the absolute maximum die temperature of 150° C. NOTE. The EPC9078 development board does not have any current or thermal protection on board. For more information regarding the thermal performance of EPC eGaN FETs, please consult: D. Reusch and J. Glaser, DC-DC Converter Handbook, a supplement to GaN Transistors for Efficient Power Conversion, First Edition, Power Conversion Publications, 2015. Table 2: Bill of Materials Item Qty Reference Part Description Manufacturer/Part Number 1 3 C4, C10, C11 Capacitor, 1 µF, 10%, 25 V, X5R Murata, GRM188R61E105KA12D 2 1 C9 Capacitor, 0.1 µF, 10%, 25 V, X5R TDK, C1005X5R1E104K050BC 3 2 C16, C17 Capacitor, 100 pF, 5%, 50 V, NP0 Kemet, C0402C101K5GACTU 4 1 C19 Capacitor, 1 µF, 10%, 25 V, X5R TDK, C1005X5R1E105K050BC 5 4 C21, C22, C23, C24 Capacitor, CER 1UF 100 V 20% X7S 0805 TDK, C2012X7S2A105M125AB 6 2 D1, D2 Schottky Diode, 30 V Diodes Inc., SDM03U40-7 7 2 Q1, Q2 eGaN FET, 100 V, 7 mΩ EPC, EPC2045 8 1 U1 IC GATE NAND 1CH 2-INP 6MICROPAK Fairchild, NC7SZ00L6X 9 1 U2 Gate Driver, LM5113, USMD, BGA Texas Instruments, LM5113 10 1 U3 Microchip, MCP1703T-5002E/MC Microchip, MCP1703T-5002E/MC 11 1 U4 IC GATE AND 1CH 2-INP 6-MICROPAK Fairchild, NC7SZ08L6X 12 1 R1 Resistor, 10.0 K, 5%, 1/8 W Stackpole, RMCF0603FT10K0 13 3 R2, R15, R3 Resistor, 0 Ω, 1/8 W, 0603 ERJ-3GEY0R00V 14 1 R4 RES SMD 100 Ω 1% 1/10 W 0603 311-100HRTR-ND 15 1 R5 RES SMD 140 Ω 1% 1/10 W 0603 311-140HRTR-ND 16 1 R19 RES SMD 0.0 Ω JUMPER 1/16 W Stackpole, RMCF0402ZT0R00TR-ND 17 3 J1, J2, J9 2 pins of Tyco, 4-103185-0 2pins of Tyco, 4-103185-0 18 6 FCI, 68602-224HLF 2 J3, J4, J5, J6, J7, J8 TP1, TP2 FCI, 68602-224HLF 19 Keystone Elect, 5015 Keystone Elect, 5015 Optional Components Item Qty Reference Part Description 1 DNP P1,P2 Optional Potentiometer 2 DNP FD1, FD2, FD3 PCB Fiducial 3 DNP J11 VGS1 Probe 4 DNP J10 VSW probe 5 DNP R14 Low side drive PWM option Manufacturer/Part Number Note 1 (36 pin Header to be cut as follows) J70 cut 4 pins used, J90 cut 2 pins used, GP1 cut 1 pin used 4 | | EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017 1 2 PWM2 CON2 1 2 CON2 J9 J2 PWM1 R15 Zero R14 Optional R1 10k CON2 NC7SZ00L6X GND B A U1 7 - 12 Vdc Y VDD R2 Zero C10 P2 Optional GND NC NC OUT SDM03U40 R5 D2 2 Y VDD MCP1703 NC NC NC NC7SZ08L6X GND B A U4 5 6 7 IN U3 GND 9 8 4 3 2 1 P1 Optional C11 HIN C17 100pF C16 100pF R3 LIN VCC LM5113TM U2 Figure 4: EPC9078 - Schematic SDM03U40 R4 D1 2 C4 VLDO CON2 1 2 J11 C19 C9 VG1 VSW R19 VCC VG2 VG1 Q2 Q1 CON2 1 2 J10 J4 CON4 VIN J3 CON4 TP1 Keystone 5015 VSW TP2 Keystone 5015 1 1 1 2 1 2 3 4 4 3 2 1 J5 CON4 1 2 3 4 J7 CON4 C21 C22 C23 C24 See Table J6 CON4 4 3 2 1 1 2 3 4 EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017 | J8 CON4 4 3 2 1 J1 QUICK START GUIDE EPC9078 | 5 For More Information: Please contact info@epc-co.com or your local sales representative Visit our website: www.epc-co.com Sign-up to receive EPC updates at bit.ly/EPCupdates or text “EPC” to 22828 EPC Products are distributed through Digi-Key. www.digikey.com Demonstration Board Notification The EPC9078 board is intended for product evaluation purposes only and is not intended for commercial use. Replace components on the Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Quick Start Guide. Contact an authorized EPC representative with any questions. This board is intended to be used by certified professionals, in a lab environment, following proper safety procedures. Use at your own risk. As an evaluation tool, this board is not designed for compliance with the European Union directive on electromagnetic compatibility or any other such directives or regulations. As board builds are at times subject to product availability, it is possible that boards may contain components or assembly materials that are not RoHS compliant. Efficient Power Conversion Corporation (EPC) makes no guarantee that the purchased board is 100% RoHS compliant. The Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this Quick Start Guide constitute a sales contract or create any kind of warranty, whether express or implied, as to the applications or products involved. Disclaimer: EPC reserves the right at any time, without notice, to make changes to any products described herein to improve reliability, function, or design. EPC does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, or other intellectual property whatsoever, nor the rights of others.