EPC9115

Demonstration Board EPC9115 Quick Start Guide 1/8th Brick Converter Featuring EPC2020 and EPC2021 DESCRIPTION The EPC9115 demonstration board is a fully regulated 300 kHz isolated DC/DC bus converter with a 12 V, 42 A output and a input range of 48 – 60 V. The demonstration board features the enhancement mode (eGaN®) field effect transistors (FETs), the EPC2020 (60 V) and EPC2021 (80 V), along with eGaN FET specific integrated circuit drivers – the LM5113 half-bridge driver and UCC27611 low side driver from Texas Instruments. The power stage is a conventional hard-switched 300 kHz isolated buck converter. The EPC9115 board is intended to showcase the superior performance that can be achieved using eGaN FETs and eGaN driver together in a conventional topology. The complete converter fits within a standard eighth-brick envelope, but the demonstration board is oversized to allow connections for bench evaluation. There are also various probe points to facilitate simple waveform measurement and efficiency calculation. A complete block diagram of the circuit is given in Figure 1. The converter uses a full-bridge (FB) primary power stage, a 4:1 transformer, and a center-tapped (CT) output stage with active reset snubbers. Control is provided by a Microchip dsPIC® controller, and basic voltage mode control is implemented. For more information on the EPC2020 and EPC2021 eGaN FETs, as well as the gate drivers and controller, please refer to the datasheets available from EPC at www.epc-co.com, www.ti.com, and www.microchip.com. These datasheets, should be read in conjunction with this quick start guide. Table 1: Performance Summary (VIN=52 V, TA = 25°C, 400 LFM unless otherwise specified) SYMBOL PARAMETER VIN Bus Input Voltage Range VOUT Output Voltage IOUT Output Current2 CONDITIONS MIN TYP UNITS 48 52 60 V 11.41 12 12.1 V Ta = 25°C, no forced air cooling3 5 A Ta = 25°C, ~200 LFM 35 A Ta = 25°C, ~400 LFM fSW MAX 42 A Switching Frequency 300 kHz For More Information: Output Ripple Frequency 600 kHz Peak Efficiency 48 VIN, 30 A IOUT 96.7 % Please contact info@epc-co.com or your local sales representative Full Load Efficiency 52 VIN, 42 A IOUT 96.4 % Full Load Efficiency 56 VIN, 42 A IOUT 96.3 % Full Load Efficiency 60 VIN, 42 A IOUT 96.1 % Visit our website: www.epc-co.com 1 2 3 Output voltage duty cycle limited to 98% Maximum current limited by thermal considerations Board placed vertical on long edge to aid convection – Do NOT operate horizontally without forced air cooling 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 EPC9115 boards are intended for product evaluation purposes only and are not intended for commercial use. As evaluation tools, they are 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. No Licenses are implied or granted under any patent right or other intellectual property whatsoever. EPC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. EPC reserves the right at any time, without notice, to change said circuitry and specifications. EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2015 QUICK START GUIDE EPC9115 QUICK START PROCEDURE Demonstration board EPC9115 is easy to set up to evaluate the performance of the EPC2020 and EPC2021 eGaN FETs and LM5113 and UCC27611 drivers. Refer to Figure 2 for proper connect and measurement setup and follow the procedure below: 6. Turn on active load and adjust to the desired load current while staying below the maximum current (This will depend on the cooling provided. If no forced air cooling, then keep the load current below 5 A). 7. If testing under moderate to full load conditions, ensure that a fan or other source of forced convection is producing adequate airflow (≥ 400 LFM recommended for full load operation). 1. With power off, connect the input power supply bus between VIN+ and VIN- euro connectors as shown. 2. Add input and output voltage measurements to the Kelvin connections provided as shown. 8. Once operational, adjust the bus voltage and load current within the allowed operating range and observe the output switching behavior, efficiency and other parameters. 3. With power off, connect the load as desired between VOUT+ and VOUTeuro connectors as shown. A resistive or constant current load is recommended. 9. For shutdown, please follow steps in reverse. NOTE. For accurate high frequency content switch node and gate voltage waveforms, use a short ground clip or purpose-made probe adapter, as shown in Fig. 3. Avoid long ground leads on oscilloscope probes. Please note that primary and secondary side grounds are not connected to each other on the EPC9115 demo board. When measuring multiple signals ensure that they are always referenced to the same ‘ground’ potential to avoid potential circuit failure or instrumentation failure. 4. Turn on the supply voltage to the required value. Do not exceed the absolute maximum voltage of 60 V on VIN. 5. Measure the output voltage to make sure the board is fully functional and operating no-load. V_IN+ Lf2 330n Lf1 470nH Cf1 12*1 uF Q3 Q1 EPC2021 p1 EPC2021 p2 D4 vsa vsa R2 C1 5.2k 100n V_OUT+ 1T vp+ V_IN- 1T EPC2021 M1 EPC2020 EPC2020 EPC2020 s1 EPC2020 V_OUT- C2 D1 470nF s2 A1 Controller V_BIAS_SEC M2 Q8 Vsnub Q6 V_BIAS_PRI Cf 12*4.7 uF Q7 Q5 Q4 snb2 p2 EPC2021 p1 snb1 Q2 D5 vsb vsb V_OUT_SNS I_OUT_SNS vsct 4T vp- V_OUT_SNS I_OUT_SNS A2 p1 p2 s1 s2 snb1 snb2 Figure 1: Block Diagram of EPC9115 Demonstration Board EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2015 | | PAGE 2 QUICK START GUIDE EPC9115 QUICK START PROCEDURE Secondary Waveforms Regulated Eigth-brick Demo Board VIN+ Vgs VOUT+ VOUT− VIN− VIN Supply