DESCRIPTION www.epc-co.com Demonstration Board EPC9101 Contact us: The EPC9101 demonstration board is a 1.2 V output, 1 MHz buck The EPC9101 demonstration board is 3 square and contains a www.epc-co.com Quick Start Guide converter with an 20 A maximum output current and 8 V to 24 fully closed loop buck converter. Renee Yawger Bhasy Nair V input voltage range. The demonstration board features the WW Marketing Global FAE Support There are also various probe points to facilitate simple wave- Office: +1.908.475.5702 Office: +1.972.805.8585 EPC2014 and EPC2015 enhancement mode (eGaN) field effect EPC2014 + EPC2015 1 MHz Buck Converter form measurement and efficiency calculation. A complete block Mobile: +1.908.619.9678 Mobile: +1.469.879.2424 transistors (FETs), as well as the first eGaN FET specific integrat - renee.yawger epc-co.com bhasy.nair epc-co.com diagram of the circuit is given in Figure 1. For more information ed circuit driver the Texas Instruments LM5113. The EPC9101 on the EPC2014/5 eGaN FETs or LM5113 driver, please refer to Stephen Tsang Peter Cheng board is not intended as a reference design, but to showcase Sales, Asia FAE Support, Asia the datasheet available from EPC at www.epc-co.com and www. the performance that can be achieved using the eGaN FETs and Mobile: +852.9408.8351 Mobile: +886.938.009.706 TI.com. These datasheets, as well that of the LT3833 controller eGaN driver together. stephen.tsang epc-co.com peter.cheng epc-co.com should be read in conjunction with this quick start guide. Table 1: Performance Summary (TA = 25C) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Bus Input Voltage Range 8 24 V IN V Switch Node Output Voltage 1.2 V OUT I Switch Node Output Current 20* A OUT EPC Products are distributed exclusively through Digi-Key. f Switching frequency 1000 kHz www.digikey.com SW Peak Efficiency 12 V , = 10 A I 89.5 % IN OUT Demonstration Board Notification Full Load Efficiency 12 V , = 20 A I 86.4 % IN OUT The EPC9101 board is intended for product evaluation purposes only and is not intended for commercial use. As an evaluation tool, it is not designed for compliance with the European Union directive on electromagnetic compatibility or any other such directives or regulations. As 83.3 board builds are at times subject to product availability, it is possible that boards may contain components or assembly materials that are not Full Load Efficiency 24 V , = 20 A I % IN OUT 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. *Maximum limited by thermal considerations and requires 200 LFM forced air cooling EPC reserves the right at any time, without notice, to change said circuitry and specifications. Quick Start Procedure VIN Do not use probe ground lead 8 V - 24 V 5 V Demonstration board EPC9101 is easy to set up to evaluate the performance of the EPC2014 and EPC2015 eGaN FETs and LM5113 driver. Refer to Figure 2 for proper connect and measurement setup and follow the procedure below: LTC3833 LM5113 VOUT Controller Gate 1.2 V / 20 A Driver 1. With power off, connect the input power supply bus between V and GND banana jacks as shown. IN Dead-Time Adjust 2. With power off, connect the active (constant current) load as desired between V and GND banana jacks as shown. OUT GND GND Single sided layout power stage 3. Turn on the supply voltage to the required value (do not exceed the absolute maximum voltage of 24 V on V ). IN Minimize loop Place probe tip on pad 4. Measure the output voltage to make sure the board is fully functional and operating no-load. Figure 1: Block Diagram of EPC9101 Demonstration Board Figure 3: Proper Measurement of Switch Node or Gate Voltage 5. Turn on active load to the desired load current while staying below the maximum current (20 A) 6. Once operational, adjust the bus voltage and load current within the allowed operating range and observe the output switching behavior, efficiency and other parameters. 7. For shutdown, please follow steps in reverse. I I IN OUT NOTE. When measuring the high frequency content switch node of gate voltage, care must be taken to avoid long ground leads. Measure these by placing the oscilloscope A A probe tip on the top pad of D3 and grounding the probe directly across D3 on the bottom pad provided for switch node and using the bottom pad of R20 and the GND pad below it for gate voltage. See Figure 3 for proper scope probe technique. Measuring the switch node with a high bandwidth ( 500MHz) probe and high bandwidth scope ( 1GHz) is recommended. < + < 20 V 24 V + + NOTE. The dead-times for both the leading and trailing edges have been set for optimum full load efficiency. Adjustment is not recommended, but can be done at own risk by V V V V Active Load V Supply IN OUT IN replacing R21 and R22 with potentiometers P1 and P2. This should be done while monitoring both the input current and switch-node voltage to determine the effect of these adjustments. Under no circumstance should the input pins to the LM5113 be probed during operation as the added probe capacitance will change the device timing. CIRCUIT PERFORMANCE The EPC9101 demonstration circuit was designed to showcase the size and performance that can readily be achieved at 1 MHz operation using eGaN FETs for supply voltages up to 24V or more. Since a closed loop controller is included on board, the associated losses must also EPC EFFICIENT POWER CONVERSION be lumped into any efficiency measurement that is performed. It is possible to supply a separate regulated 5V supply to the EXTVCC pin to further improve efficiency. In that case, the controller and gate drive losses are still included, but the associated conversion loss from Figure 2: Proper Connection and Measurement Setup Figure 4: Typical Switch node voltage for a 24 V to 1.2 V/20 A (1 MHz) Buck converter the input supply (LDO loss) is removed.DESCRIPTION www.epc-co.com Demonstration Board EPC9101 Contact us: The EPC9101 demonstration board is a 1.2 V output, 1 MHz buck The EPC9101 demonstration board is 3 square and contains www.epc-co.com Quick Start Guide converter with an 20 A maximum output current and 8 V to 24 a fully closed loop buck converter. The power stage is a single Renee Yawger Bhasy Nair V input voltage range. The demonstration board features the sided design and is contained within 20mm x 11mm area and WW Marketing Global FAE Support EPC2014 and EPC2015 enhancement mode (eGaN) field effect includes driver, eGaN FETs, bus capacitors and output inductor. Office: +1.908.475.5702 Office: +1.972.805.8585 EPC2014 + EPC2015 1 MHz Buck Converter Mobile: +1.908.619.9678 Mobile: +1.469.879.2424 transistors (FETs), as well as the first eGaN FET specific integrat - There are also various probe points to facilitate simple waveform renee.yawger epc-co.com bhasy.nair epc-co.com ed circuit driver the Texas Instruments LM5113. The EPC9101 measurement and efficiency calculation. A complete block dia- Stephen Tsang Peter Cheng board is not intended as a reference design, but to showcase gram of the circuit is given in Figure 1. For more information on the Sales, Asia FAE Support, Asia the performance that can be achieved using the eGaN FETs and Mobile: +852.9408.8351 Mobile: +886.938.009.706 EPC2014/5 eGaN FETs or LM5113 driver, please refer to the data- eGaN driver together. stephen.tsang epc-co.com peter.cheng epc-co.com sheet available from EPC at www.epc-co.com and www.TI.com. These datasheets, as well that of the LT3833 controller should be read in conjunction with this quick start guide. Table 1: Performance Summary (TA = 25C) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Bus Input Voltage Range 8 24 V IN V Switch Node Output Voltage 1.2 V OUT EPC Products are distributed exclusively through Digi-Key. www.digikey.com I Switch Node Output Current 20* A OUT f Switching frequency 1000 kHz SW Demonstration Board Notification Peak Efficiency 12 V , = 10 A I 89.5 % The EPC9101 board is intended for product evaluation purposes only and is not intended for commercial use. As an evaluation tool, it is not IN OUT 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 Full Load Efficiency 12 V , = 20 A I 86.4 % IN OUT 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 83.3 Full Load Efficiency 24 V , = 20 A I % assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. IN OUT EPC reserves the right at any time, without notice, to change said circuitry and specifications. *Maximum limited by thermal considerations and requires 200 LFM forced air cooling Quick Start Procedure VIN Do not use probe ground lead 8 V - 24 V 5 V Demonstration board EPC9101 is easy to set up to evaluate the performance of the EPC2014 and EPC2015 eGaN FETs and LM5113 driver. Refer to Figure 2 for proper connect and measurement setup and follow the procedure below: LTC3833 LM5113 VOUT Controller Gate 1.2 V / 20 A Driver 1. With power off, connect the input power supply bus between V and GND banana jacks as shown. IN Dead-Time Adjust 2. With power off, connect the active (constant current) load as desired between V and GND banana jacks as shown. OUT GND GND Single sided layout power stage 3. Turn on the supply voltage to the required value (do not exceed the absolute maximum voltage of 24 V on V ). IN Minimize loop Place probe tip on pad 4. Measure the output voltage to make sure the board is fully functional and operating no-load. Figure 1: Block Diagram of EPC9101 Demonstration Board Figure 3: Proper Measurement of Switch Node or Gate Voltage 5. Turn on active load to the desired load current while staying below the maximum current (20 A) 6. Once operational, adjust the bus voltage and load current within the allowed operating range and observe the output switching behavior, efficiency and other parameters. 7. For shutdown, please follow steps in reverse. I I IN OUT NOTE. When measuring the high frequency content switch node of gate voltage, care must be taken to avoid long ground leads. Measure these by placing the oscilloscope A A probe tip on the top pad of D3 and grounding the probe directly across D3 on the bottom pad provided for switch node and using the bottom pad of R20 and the GND pad below it for gate voltage. See Figure 3 for proper scope probe technique. Measuring the switch node with a high bandwidth ( 500MHz) probe and high bandwidth scope ( 1GHz) is recommended. < + < 20 V 24 V + + NOTE. The dead-times for both the leading and trailing edges have been set for optimum full load efficiency. Adjustment is not recommended, but can be done at own risk by V V V V Active Load V Supply IN OUT IN replacing R21 and R22 with potentiometers P1 and P2. This should be done while monitoring both the input current and switch-node voltage to determine the effect of these adjustments. Under no circumstance should the input pins to the LM5113 be probed during operation as the added probe capacitance will change the device timing. CIRCUIT PERFORMANCE The EPC9101 demonstration circuit was designed to showcase the size and performance that can readily be achieved at 1 MHz operation using eGaN FETs for supply voltages up to 24V or more. Since a closed loop controller is included on board, the associated losses must also EPC EFFICIENT POWER CONVERSION be lumped into any efficiency measurement that is performed. It is possible to supply a separate regulated 5V supply to the EXTVCC pin to further improve efficiency. In that case, the controller and gate drive losses are still included, but the associated conversion loss from Figure 2: Proper Connection and Measurement Setup Figure 4: Typical Switch node voltage for a 24 V to 1.2 V/20 A (1 MHz) Buck converter the input supply (LDO loss) is removed.