EPC9034

Development Board EPC9034 Quick Start Guide 80 V Half-bridge with Gate Drive, Using EPC2021 Revision 2.0 QUICK START GUIDE EPC9034 DESCRIPTION Table 1: Performance Summary (TA = 25°C) EPC9034 The EPC9034 development board is a 80 V maximum device voltage, 35 A maximum output current, half bridge with onboard gate drives, featuring the EPC2021 enhancement mode (eGaN®) field effect transistor (FET). The purpose of this development board is to simplify the evaluation process of the EPC2021 eGaN FET by including all the critical components on a single board that can be easily connected into the majority of existing converter topologies. Symbol Parameter VDD Gate Drive Input Supply Range VIN Bus Input Voltage Range(1) IOUT Switch Node Output Current (2) VPWM PWM Logic Input Voltage Threshold VSW Switch-node Voltage The EPC9034 development board measures 2” x 2” and contains two EPC2021 eGaN FETs in a half bridge configuration using the Texas Instruments LMG1205 gate driver. The board also contains all critical components and the layout supports 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. Conditions Input ‘High’ Input ‘Low’ Min Max Units 7 12 V 64(1) V 35(2) A 6 1.5 V V 3.5 0 64(1) Minimum ‘High’ State Input Pulse Width VPWM rise and fall time < 10ns Minimum ‘Low’ State Input Pulse Width (3) VPWM rise and fall 100(3) time < 10ns 50 ns ns (1) Maximum input voltage depends on inductive loading, maximum switch node ringing must be kept under 80 V for EPC2021. (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. For more information on the EPC2021 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. QUICK START PROCEDURE The half bridge development board EPC9034 is easy to set up as buck or boost converter. Refer to figure 2 for buck converter configuration and measurement setup, and figure 3 for boost converter setup, and follow the procedure below: Buck converter configuration 1. With power off, connect the input power supply bus to VIN (J5, J6) and ground / return to GND. 2. With power off, connect the switch node (SW) of the half bridge to your circuit as required (half bridge configuration). Or use the provided pads for inductor (L1) and output capacitors (Cout), as shown in figure 2 with a DC load connected across VOUT and GND. 3. With power off, connect the gate drive supply to VDD (J1, Pin-1) and ground return to GND (J1, Pin-2 indicated on the bottom side of the board). Front view 4. With power off, connect the input PWM control signal to PWM1 (J2, Pin-1) and ground return to any of GND J2 pins indicated on the bottom side of the board. 5. Turn on the gate drive supply – make sure the supply is between 7.5 V and 12 V. 6. Turn on the controller / PWM input source. 7. Making sure the intial input supply voltage is 0 V, turn on the power and slowly increase the voltage to the required value (do not exceed the absolute maximum voltage). 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. Back view EPC9034 development board EPC – THE LEADER IN GaN TECHNOLOGY | WWW.EPC-CO.COM | COPYRIGHT 2019 | | 2 QUICK START GUIDE EPC9034 Boost Converter configuration 3. With power off, connect the gate drive supply to VDD (J1, Pin-1) and ground return to GND (J1, Pin-2 indicated on the bottom side of the board). 4. With power off, connect the input PWM control signal to PWM1 (J2, Pin-1) and ground return to any of GND J2 pins indicated on the bottom side of the board. Note that the bottom FET gate drive signal is inverted with regard to PWM1. It is also possible to use separate input PWM signals by removing R2 and R17 and installing 0 Ω jumpers for R14 and R16. Q1 Logic and dead-time adjust PWM Output CBypass Q2 GND PGND Gate driver Figure 1: Block diagram of EPC9034 development board V 7.5 – 12 VDC Main voltage measurement (HIGH VOLTAGE!) VDD supply (Note polarity) VMain supply (Note polarity) + 2. With power off, connect the input power supply bus to VOUT (J9, Pin-1) and ground / return to GND (J9, Pin-2), or externally across the capacitor if the inductor L1 and Cout are provided externally. Connect the output voltage (labeled as VIN, J5, J6) to your circuit as required, e.g., resistive load. Gate drive regulator VDD Level shift 1. The inductor (L1) and input capacitors (labeled as Cout) can either be soldered onto the board, as shown in figure 3, or provided off board. Anti-parallel diodes can also be installed using the additional pads on the right side of the EPC2021 FETs. + Warning: Never operate the boost converter mode without a load as the output voltage can increase beyond the maximum ratings. VIN 5. Turn on the gate drive supply – make sure the supply is between 7.5 V and 12 V. 7. Making sure the output is not open circuit, and the input supply voltage is initially 0 V, turn on the power and slowly increase the voltage to the required value (do not exceed the absolute maximum voltage). 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. Observe device temperature for operational limits. 9. For shutdown, please follow steps in reverse. Dead-time adjust Control signal inputs Output Inductor Output Capacitor DC load Figure 2: Buck configuration 7.5 – 12 VDC Input Inductor + 6. Turn on the controller / PWM input source. 32 VDCmax VDD supply (Note polarity) DC load 32 VDCmax Dead-time adjust Input Capacitor VMain supply (Note polarity) + Control signal inputs Figure 3: Boost configuration EPC – THE LEADER IN GaN TECHNOLOGY | WWW.EPC-CO.COM | COPYRIGHT 2019 | | 3 QUICK START GUIDE EPC9034 THERMAL CONSIDERATIONS The EPC9034 development board showcases the EPC2021 eGaN FET. The EPC9034 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 EPC9034 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. Voltage measurement: Input voltage for Buck, Output voltage for Boost (HIGH VOLTAGE!) Q1 gate MMCX (HIGH VOLTAGE!) Q2 gate MMCX V Switch-node output Switch-node oscilloscope probe Ground oscilloscope probe Q2 gate Ground MEASUREMENT CONSIDERATIONS Figure 4: Measurement top side 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. MMCX connector footprint is also provided (J15 in figure 5) to measure switch node. Switch-node oscilloscope probe Ground oscilloscope probe Low-side gate voltage (VGS2) can be measured at the two pin header (J22) or the MMCX (J12). Please refer to figure 4. R7 (0 Ω resistor) will need to be installed. High-side gate voltage (VGS1) can only be measured using the MMCX connector (J11). Please refer to figure 4. R6 (0 Ω resistor) will need to be installed. Differential probe is recommended for measuring high-side gate. IsoVu probes from Tektronix has mating MMCX connector. For regulator passive voltage probes (e.g. TPP1000) measuring low-side gate or switch node using MMCX connector, probe adaptor is available. PN: 206-0663-xx. Switch-node MMCX Figure 5: Measurement bottom side. NOTE. For information about measurement techniques, the EPC website offers: “AN023 Accurately Measuring High Speed GaN Transistors” and the How to GaN educational video series, including: HTG09- Measurement EPC – THE LEADER IN GaN TECHNOLOGY | WWW.EPC-CO.COM | COPYRIGHT 2019 | | 4 QUICK START GUIDE EPC9034 Table 2: Bill of Materials Item Qty Reference Part Description Manufacturer Part Number 1 3 C4, C10, C11 Capacitor, 1 µF, ±10%, 25 V X7R TDK C1608X7R1E105K 2 3 2 1 C5, C6 C9 Capacitor, 0.1 µF, ±10%, 25 V X7R Capacitor, 0.1 µF, ±10%, 25 V X7R TDK Yageo C1608X7R1E104K CC0402KRX7R8BB104 4 2 C12, C14 Capacitor, 0.1 µF, ±10%, 16 V X7R Murata GRM155R71C104KA88D 5 1 C15 Capacitor, 0.022 µF, ±10%, 25 V X7R TDK C1005X7R1E223K050BB 6 2 C16, C17 Capacitor, 100 pF, ±10%, 50 V X7R Yageo CC0402KRX7R9BB101 7 1 Capacitor, 4.7 µF, ±10%, 10 V X5R TDK C1005X5R1A475K050BC 8 10 Capacitor, 1 µF, ±20%, 100 V X7S TDK C2012X7S2A105M125AB 9 7 Capacitor, 0.22 µF, ±10%, 100 V X7S Taiyo Yuden HMK107C7224 10 4 C20 C21, C22, C23, C24, C25, C26, C34, C35, C36, C37 C27, C28, C29, C30,C31, C32, C33 D1, D2, D5, D6 Schottky Diode, 30 V 30 mA Diodes Inc. SDM03U40 11 1 D4 Zener Diode, 5.1 V, 150 mW, ±5% Bournes CD0603-Z5V1 12 1 U2 100 V eGaN Driver TI LMG1205YFXR 13 2 Q1, Q2 eGaN FET, 80 V, 2.5 mΩ EPC EPC2021 14 1 Q3 eGaN FET, 100 V, 3300 mΩ EPC EPC2038 15 2 R1, R15 Resistor, 10 kΩ, ±5%, 1/10 W Yageo RC0603JR-0710KL 16 3 R2, R3, R17 Resistor, 0.0 Ω, 1/16 W Stackpole RMCF0603ZT0R00 17 1 R4 Resistor, 10 Ω, ±1%, 1/10 W Panasonic ERJ-3EKF10R0V 18 1 Resistor, 100 Ω, ±1% 0.1 W, 1/10 W Panasonic ERJ-3EKF1000V 19 1 R5 R9 Resistor, 0 Ω Jumper 0.063 W, 1/16 W Stackpole RMCF0402ZT0R00 20 2 R19, R21 Resistor, 2.7 Ω, ±5% 0.1 W, 1/10 W Panasonic ERJ-2GEJ2R7X 21 2 R20, R22 Resistor, 500 mΩ, ±1% 0.125 W, 1/8 W Stackpole PT0402FR-7W0R5L 22 1 R24 Resistor, 27 kΩ, ±5% 0.1 W, 1/10 W Panasonic ERJ-2GEJ273X 23 1 R25 Resistor, 20 Ω, ±5% 0.063 W, 1/16 W Stackpole RMCF0402JT20R0 24 1 U3 I.C., Regulator Microchip MCP1703T-5002E/MC 25 1 U1 I.C., Logic Fairchild NC7SZ00L6X 26 1 U4 I.C., Logic Fairchild NC7SZ08L6X 27 2 J1, J22 Connector Würth 61300211121 28 2 J2, J3 Connector Tyco 4-103185-0-04 29 2 TP1, TP2 SMT test point Keystone 5015 Optional Components Item Qty Reference Part Description Manufacturer Part Number 1 DNP Cout TBD Generic Generic 2 DNP D3 Schottky Diode, 40 V 300 mA ST BAT54KFILM 3 DNP D7, D8 Schottky Diode, 100 V 2A Vishay SS2PH10-M3 4 DNP L1 Inductor - TBD Generic Generic 5 DNP P1, P2 Potentiometer, 1 kΩ 0.25 W, 1/4 W Murata PV37W102C01B00 6 DNP R10, R14, R16 Resistor, 0 Ω Jumper 0.1 W, 1/10 W Stackpole RMCF0603ZT0R00 7 DNP R6, R7 Resistor, 0 Ω Jumper 0.063 W, 1/16 W Stackpole RMCF0402ZT0R00 8 DNP R18 Resistor, 4.7 Ω, ±5% 0.1 W, 1/10 W Panasonic ERJ-2GEJ4R7X 9 DNP J9 7.62 mm Euro Term. Würth 691216410002 10 DNP J10 .1" Male Vert. Würth 61300211121 11 DNP J11, J12, J15 Connector Molex 0734152063 EPC – THE LEADER IN GaN TECHNOLOGY | WWW.EPC-CO.COM | COPYRIGHT 2019 | | 5 VLDO C4 1 μF, 25 V C10 1 μF, 25 V .1" Male Vert. R3 C21 1 μF, 100 V VCC 0Ω Int. Regulator C22 1 μF, 100 V C23 1 μF, 100 V U4 NC7SZ08L6X PWM1 P1 EMPTY D5 SDM03U40 40 V 30 mA HIN 1 C14 C5 100 nF, 25 V C15 100 nF, 16 V R24 27 k 22 nF, 25V VG1 VSW 2 R25 20 Ω 0Ω EMPTY PWM1 R2 0Ω U2 2 P2 EMPTY HIN VSW R20 0.5 Ω LIN D2 SDM03U40 PWM2 R14 2 R9 VG2 C20 4.7 μF, 10 V R22 0.5 Ω C16 100 pF, 50 V C17 100 pF, 50 V Q2 EPC2021 VG2 4.7 V L1 TBD 2 1 .1" Male Vert. J2 .1" Male Vert. PWM1 VG2 PWM2 R7 0Ω EMPTY J12 VOUT MMCX vGS2 probe adapter Sync Buck Output J9 1 2 EMPTY 7.62 mm Euro Term. Cout TBD GND J3C TP1 1 2 EMPTY VSW J10 2 1 EMPTY vSW probe holes vSW probe adapter MMCX VSW J15 1 2 EMPTY EPC9034 Figure 6: EPC9034 - Schematic VOUT 0Ω J22 Direct Drive VOUT D7 100 V, 2 A SS2PH10-M3 EMPTY uP1966A 0Ω EMPTY SW Output J3B EMPTY VCC R21 2.7 Ω C6 100 nF, 25 V VSW D3 40 V 300 mA BAT54KFILM EMPTY 4.7 V VCC Q1 EPC2021 VSW VG1 LIN D8 100 V, 2 A SS2PH10-M3 EMPTY VG1 2.7 Ω R19 B R15 10 k 5VHS1 Deadtime Lower 2 C33 220 nF, 100 V J3A 1 2 EMPTY C9 0.1 μF, 25 V TBD 1 A U1 NC7SZ00L6X C32 220 nF, 100 V TP2 vGS1 probe adapter VG2 R5 C31 220 nF, 100 V J11 MMCX D6 SDM03U40 40 V 30 mA Direct Drive VCC C30 220 nF, 100 V VIN R6 0Ω EMPTY 1 R16 C29 220 nF, 100 V Main Supply Input D1 SDM03U40 PWM2 C28 220 nF, 100 V 4.7 V PWM1 C37 1 μF, 100 V Synchronous Boostrap Power Supply VCC R1 10 k C36 1 μF, 100 V VSW Deadtime Upper 2 C27 220 nF, 100 V D4 CD0603-Z5V1 5V1, 150 mW Gbtst 2 B 1 4.7 Ω EMPTY C12 100 nF, 16 V TBD R17 0Ω A C35 1 μF, 100 V 5VHS1 1 PWM1 C34 1 μF, 100 V VIN 2 R18 VCC R4 C26 1 μF, 100 V C11 1 μF, 25 V EPC2038 100 V 2800 mΩ Q3 VCC C25 1 μF, 100 V C24 1 μF, 100 V 1 2 3 4 5 6 7 8 IN 9 10 11 12 13 14 15 16 V7in VIN VCC 17 18 19 20 21 22 23 24 V7in GND J1 R10 0Ω EMPTY U3 MCP1703T-5002E/MC QUICK START GUIDE EPC – THE LEADER IN GaN TECHNOLOGY | WWW.EPC-CO.COM | COPYRIGHT 2019 | Ext. Regulator V7in Logic Supply Regulator Logic Supply 7.5 VDC - 12 VDC | 6 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 EPC9034 board is intended for product evaluation purposes only. It is not intended for commercial use nor is it FCC approved for resale. 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.