EPC9131

Demonstration Board EPC9131 Quick Start Guide 19 V Regulated SEPIC Using EPC2112 Revision 1.0 QUICK START GUIDE Demonstration Board EPC9131 DESCRIPTION The EPC9131 demonstration board is a 19 V output, 300 kHz single-ended primary-inductor converter (SEPIC) with a 27 W maximum output power and 14 V to 48 V input voltage range. The demonstration board features the EPC2112 enhancement mode (eGaN®) integrated circuit (IC), as well as the LM3481 controller intended for use with MOSFETs. The EPC9131 board contains the complete power stage (including eGaN IC, driver, inductors and input/output capacitors) in a compact 25 mm x 33 mm layout to showcase the performance that can be achieved using the eGaN IC. It also contains a closed-loop SEPIC with optimized control loop. The total board dimension is 48 mm x 50 mm. There are also various probe points to facilitate efficiency measurement. A complete power schematic block diagram of the circuit is given in figure 1. EPC9131 demonstration board For more information on the EPC2112 eGaN IC or LM3481 controller, please refer to the datasheet available from EPC at www.epc-co.com and www.ti.com respectively. These datasheets should be read in conjunction with this quick start guide. QUICK START PROCEDURE Table 1: Performance Summary (TA = 25°C) EPC9131 Demonstration board EPC9131 is easy to set up to evaluate the performance of the EPC2112 eGaN IC and directly driven from the controller IC. Refer to figure 2 for proper connection and measurement setup and follow the procedure below: 1. With power off, connect the input power supply bus between VIN and GND, J2, as shown. 2. With power off, connect the load as desired between VOUT and GND, J3, as shown. Symbol 5. Turn on active load to the desired power/current while staying below the maximum power (27 W/1.42 A). Conditions VCC VIN Output Voltage IOUT Output Power fsw UVLO Enable Input Voltage Rising VPWM UVLO Disable Input Voltage Falling 3. Turn on the supply voltage beyond UVLO to the required value (do not exceed the absolute maximum voltage of 48 V on VIN ). 4. Measure the output voltage to make sure the board is fully functional and operating no-load. Parameter Bus Input Voltage Range Typ Max Units 14 48 V 19 0 Switching Frequency VPWM Min Max. Input Current Limited by the controller at 14 V input V 27 W 13.8 V 5 V 300 kHz 2* A *Actual maximum current subject to operating temperature limits. 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. Voltage measurement 7. For shutdown, please follow steps in reverse. NOTE. When measuring the high frequency content switch node, care must be taken to avoid long ground leads. For details, please refer to AN023 Accurately Measuring High Speed GaN Transistors.pdf. VDD C63,68 5V VCC Controller EPC2112 D60 VOUT D IN GND S Q60 L61 VIN Supply (note polarity) C64, 65, 66 RLoad Oscilloscope probe Figure 1. Power schematic block diagram of the EPC9131 demonstration board. 2 | RLoad + L60 Input supply 14 V - 48 VDC 2.5 A capable Figure 2. Power schematic block diagram of the EPC9131 demonstration board. | EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018 QUICK START GUIDE Demonstration Board EPC9131 CIRCUIT PERFORMANCE The EPC9131 demonstration circuit was designed to showcase the performance of eGaN IC that can readily be achieved at 300 kHz operation for supply voltages up to 48 V. Since a closed loop controller is included on board, the associated losses must also be lumped into any efficiency measurement that is performed. In an effort to mitigate these losses and focus on the efficiency of the power stage, the controller is powered directly from the input. Thus the controller and logic losses are still included. Typical efficiency curves of the converter for different input voltages and different output power levels are shown in figure 3. Figure 4 shows the measured switch-node voltage of the eGaN IC operating with 48 V input and delivering 27 W at 19 V into the load. Figure 5 shows the waveform zoomed in to reveal details of the voltage transition. 95 20 V 30 V 40 V 48 V 90 Efficiency (%) 85 80 10 V/div, 200 ns/div 75 70 65 0 5 10 15 20 25 30 Output Current (A) Figure 3: EPC9131 typical efficiency measurement for various input voltages and output power levels. Figure 4: Measured switch-node waveforms for 48 V input to 19 V output at 27 W load power (300 kHz). 10 V/div, 4 ns/div Figure 5: Zoomed-in measured switch-node waveforms for 48 V input to 19 V output at 27 W load power (300 kHz). EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018 | | 3 QUICK START GUIDE Demonstration Board EPC9131 Figure 6 shows a thermal image of the EPC9131 operating at with 48 V input and 19 V output delivering 27 W into the load and reveals that the hottest component is the controller IC. Oscilloscope probe holder D60 Q60 U50 Figure 6: Thermal image of the EPC9131 operating at with 48 V input and 19 V output delivering 27 W into the load. THERMAL CONSIDERATIONS The EPC9131 is intended for bench evaluation with low ambient temperature. The addition of heat-sinking and forced air cooling could potentially increase the output power capability of the demonstration circuit, but care must be taken to not exceed the absolute maximum die temperature of 150°C and stay within the constraints of the other components within the circuit, most notably the output diode and saturation of the inductors. Table 2a: Bill of Materials 4 | Item Qty 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 1 3 1 2 6 3 1 2 1 1 1 1 2 1 1 1 1 1 2 Reference Part Description Manufacturer Part # C44 C50 C51, C56, C57 C53 C55, C90 C61, C62, C63, C68, C71, C72 C64, C65, C66 C67 C80, C81 C92 D51 D60 D67 D82, D85 D83 D84 D86 D87 D88 J2, J3 100 pF, 25 V 100 nF, 100 V 100 nF, 16 V 220 pF, 50 V 1 μF, 25 V 10 μF 50 V 22 μF 35 V 10 nF, 200 V 10 μF 50 V 22 pF, 50 V 30 V 500 mA 100 V 5A 200 V, 1A 2.7 V 250 mW LED 0603 Blue LED 0603 Green LED 0603 Red 43 V 250 mW 38 V, 7.5 A .1" Male Vert. Würth Murata Würth Murata TDK Taiyo Yuden TDK Kemet Nichicon Würth ST Diodes Diodes Inc. NXP Lite-On Lite-On Lite-On Nexperia Littelfuse Amphenol FCI 885012205038 GRM188R72A104KA35D 885012205037 GRM155R71H221KA01D C1005X5R1E105M050BC UMK325BJ106MM-T C3216JB1V226M160AC C0603C103K2RACTU UZR1H100MCL1GB 885012005057 STPS0530Z PDS5100-13 DFLS1200 BZX84-C2V7,215 LTST-C193TBKT-5A LTST-C193KGKT-5A LTST-C193KRKT-5A BZX84-C43,215 SMAJ33A 95278-101A04LF | EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018 QUICK START GUIDE Demonstration Board EPC9131 Table 2b: Bill of Materials Item Qty 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 2 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 Reference Part Description Manufacturer Part # L60, L61 L90 Q60 R40 R41 R50 R51 R52 R53 R54 R57 R58 R60 R67 R81, R83 R82 R92 U50 22 μH 2.9A 10 μH 150 mA 200 V 6A 40 mΩ 84.5 k 1% 6.04 k 10 Ω 124 k 1% 56.2 k 1% 2.32 k 300 Ω 300 k 1% 34 k 1% 22 mΩ 0.4 W 10 k 5% 2/3 W 4.7 k 422 Ω 20 Ω Boost Controller Vishay Dale Taiyo Yuden EPC Panasonic Panasonic Panasonic Panasonic Yageo Yageo Yageo Panasonic Yageo Vishay Dale Panasonic Stackpole Yageo Stackpole Texas Instruments IHLP2525CZER220M11 LBR2012T100K EPC2112 ERJ-3EKF8452V ERJ-2RKF6041X ERJ-3EKF10R0V ERJ-2RKF1243X RC0402FR-0756K2L RC0402FR-072K32L RC0402JR-07300RL ERJ-3EKF3003V RC0402FR-0734KL WSLP0603R0220FEB ERJ-P08J103V RMCF1206FT4K70 RMCF0603FT422R RMCF0402JT20R0 LM3481MM/NOPB Table 3: Optional Components Item Qty 1 2 3 4 5 3 1 1 1 1 Reference Part Description Footprint C52, C54, R55 D61 D90 GP60 JP50 Ceramic Capacitor high Q Diode 100 V, 5 A Diode, 5 V1, 150 mW '.1" Male Vert. '.05" 2 pos Male Vert CC0402sml PowerDi5SMB D0603 SIP1 SIP2.05 EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018 | | 5 R8 2 422 Ω + C80 10 μF 50 V R8 3 4.7 k 2 D88 38V, 7.5A SMAJ33A 1 1 R8 1 4.7 k Vunreg 2 Vunreg Vunreg Vunreg 2 4 3 2 1 Vo ut Vunreg 1 Vunreg J2 + C81 10 μF 50 V D84 L ED 0603 Green D86 L ED 0603 Red D83 L ED 0603 Blue .1" Male Vert. 12.5 V to 48 V D85 Overvoltage Protection Reverse Polarity Protection D87 Power Indicator Vunreg > 4V D82 43V 250 mW 2.7V 250 mW QUICK START GUIDE 2.7V 250 mW Over-Voltage Indicator Vout > 46V Vunreg Output Indicator Vunreg C72 10 μF 50 V 1 C71 10 μF 50 V C67 10 nF, 200 V R6 7 10 k 5% 2/3 W Vunreg 1 Vunreg 2 6V JP50 .05" 2 pos Male Vert EMPTY R5 1 124 k 1% 2 C61 10 μF 50 V Vunreg C54 EMPTY 10 FA/Sync/SD Comp U50 Comp LM3481MM/NOPB C51 100 nF, 16 V Isns 1 R5 4 300 Ω Osc Bias UVLO 2 R5 8 34 k 1% 1.275V Vfdbk 4 9 FB DR Cnt 2 1 8 UVLO Disable = 12.5 V Enable = 14 V 5V L 90 10 μH 150 mA PreDR D60 PDS51 00-13 Pgnd C56 100 nF, 16 V 5VGD 2 C63 10 μF 50 V L 60 22 μH 2.9 A C68 10 μF 50 V SW Q60 EPC2112 200 V 6A 40mΩ PW M C92 22 pF 50 V Isns J3 1 2 3 4 .1" Male Vert. Vo ut Vo ut Vo ut C64 22 μF 35 V C65 22 μF 35 V C66 22 μF 35 V 1 PH60 ProbeHole 5VGD PW M 100 V 5 A Vo ut Vo ut GP60 .1" Male Vert. 1 EMPTY Isns GND Ground Post D90 CZRU52C5V1 EM PT Y Isns 2 C53 100 pF, 25 V 5 Agnd 1 R9 2 20 Ω Vunreg C90 1 μF 25 V Isns 6V Isens Vfdbk D61 EMPTY 100 V 5 A 22 μH 2.9 A 2 C52 EMPTY D67 DFLS1200 200 V 1 A L 61 2 FA/S D 6 3 C62 10 μF 50 V C50 100 nF, 100 V R5 7 300 k 1% Vin 1 2 R5 3 2.32 k 1 R55 EMPTY Vunreg R5 2 56.2 k 1% 2 2 Set to 300 kHz Snubber 2 7 Regulator Disable 1 R5 0 10 Ω 1 1 1 2 1 EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2018 | Vunreg R4 0 2 84.5 k 1% Vfdbk 6V D51 R6 0 22 mΩ 0.4 W 5V 2 R4 1 6.04 k C44 100 pF, 25 V 30 V 500 mA ST PS0530Z C57 100 nF 16 V Output Voltage Set Figure 7: EPC9131 schematic C55 1 μF 25 V Demonstration Board EPC9131 set to 19 V 1 1 1 Vo ut | 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 EPC9131 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.