LM5116-12EVAL

User's Guide SNVA285A – October 2007 – Revised April 2013 AN-1713 LM5116-12 Evaluation Board 1 Introduction The LM5116-12 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM5116 controller IC. The evaluation board provides a 12V output with a 5A current capability. The operating input voltage ranges from 15V to 80V. The design operates at 250kHz, a good compromise between conversion efficiency and solution size. The printed circuit board consists of 4 layers, 2 ounce copper top and bottom, 1 ounce copper internal layers on FR4 material with a thickness of 0.06 inches. This user's guide contains the evaluation board schematic, Bill-of-Materials (BOM), and a quick setup procedure. For complete circuit design information, see LM5116 Wide Range Synchronous Buck Controller (SNVS499). The performance of the evaluation board is: • Input Range: 15V to 80V • Output Voltage: 12V • Output Current: 0 to 5A • Frequency of Operation: 250 kHz • Board Size: 2.55 × 2.65 × 0.7 inches • Load Regulation: 1% • Line Regulation: 0.1% • Hiccup Mode Current Limit Protection Figure 1. Efficiency with 10 µH Gowanda Inductor Figure 2. Efficiency with 10 µH Pulse Inductor All trademarks are the property of their respective owners. SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback AN-1713 LM5116-12 Evaluation Board Copyright © 2007–2013, Texas Instruments Incorporated 1 Powering and Loading Considerations 2 www.ti.com Powering and Loading Considerations Read this entire section prior to attempting to power the evaluation board. 2.1 Quick Setup Procedure Step 1: Set the power supply current limit to 10A. Turn off the power supply. Connect the power supply to the VIN terminals. Step 2: Connect the load, with a 5A capability, to the VOUT terminals. The positive connection goes to P3 and negative connection to P4. Step 3: The EN pin should be left open for normal operation. Step 4: Set VIN to 48V with no load applied. VOUT should be in regulation with a nominal 12V output. Step 5: Slowly increase the load while monitoring the output voltage, VOUT should remain in regulation with a nominal 12V output as the load is increased up to 5 Amps. Step 6: Slowly sweep the input voltage from 15V to 80V, VOUT should remain in regulation with a nominal 12V output. Step 7: Temporarily short the EN pin to GND to check the shutdown function. Step 8: Increase the load beyond the normal range to check current limiting. Hiccup mode current limit is used for protection. The peak short circuit current is limited to approximately 11A. Cooling is critical during this step. 2.2 Air Flow Prolonged operation with high input voltage at full power will cause the MOSFETs to overheat. A standalone fan with at least 200 LFM should always be provided. Figure 3. Temperature Rise at 48VIN with 10 µH Gowanda Inductor 2 AN-1713 LM5116-12 Evaluation Board Figure 4. Temperature Rise at 48VIN with 10 µH Pulse Inductor SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Powering and Loading Considerations www.ti.com 2.3 Powering Up Using the enable pin provided will allow powering up the source supply with the current level set low. It is suggested that the load be kept low during the first power up. Set the current limit of the source supply to provide about 1.5 times the anticipated wattage of the load. As you remove the connection from the enable pin to ground, immediately check for 12 volts at the output. A quick efficiency check is the best way to confirm that everything is operating properly. If something is amiss you can be reasonably sure that it will affect the efficiency adversely. Few parameters can be incorrect in a switching power supply without creating losses and potentially damaging heat. 2.4 Over Current Protection The evaluation board is configured with hiccup mode over-current protection. This helps to limit the thermal stress while in an overloaded condition. If a sustained overload is expected before the onset of hiccup mode, ensure that sufficient cooling (airflow) is maintained. The peak short circuit current is limited to approximately 11A. For sustained short circuit protection, a counter trips the internal fault timer when a current limit condition exists for more than 256 clock cycles. C7 sets the off-time of the current limit fault timer, which may be lengthened by increasing the value of C7. D2 is used to discharge C7 in the event of a fast decay of the input voltage. Though not recommended, the hiccup fault timer may be disabled by removing C7. Figure 5. Short Circuit at 48VIN Figure 6. Short Circuit at 80VIN Figure 7. Short Circuit Recovery into Resistive Load SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback AN-1713 LM5116-12 Evaluation Board Copyright © 2007–2013, Texas Instruments Incorporated 3 Powering and Loading Considerations 2.5 www.ti.com Synchronization A SYNC pin has been provided on the evaluation board. This pin can be used to synchronize the regulator to an external clock. For complete information, see LM5116 Wide Range Synchronous Buck Controller (SNVS499). Figure 8. Synchronization at 48VIN 2.6 Active Loads Figure 9 shows a typical start-up characteristic into a constant current active load. This type of load can exhibit an initial short circuit, which is sustained well beyond the duration of the fault timer. Increasing the soft-start time improves the ability to start into this type of load. For the extreme case, the hiccup fault timer may be disabled by removing C7. A sustained short circuit should be avoided when the fault timer is not used. Figure 9. Start-up into Active Load at 48VIN 4 AN-1713 LM5116-12 Evaluation Board SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Typical Performance Waveforms www.ti.com 3 Typical Performance Waveforms Figure 10. Synchronous Operation at 48VIN with JMP1 Removed Figure 11. Discontinuous Operation using Diode Emulation Mode at 48VIN with JMP1 Installed Figure 12. Transient Response at 48VIN Figure 13. Start-up into Resistive Load at 48VIN Figure 14. Shut Down at 48VIN SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback AN-1713 LM5116-12 Evaluation Board Copyright © 2007–2013, Texas Instruments Incorporated 5 Bill of Materials 4 www.ti.com Bill of Materials ID Part Number Type Size Parameters Qty Vendor C1, C2, C14 C2012X7R1E105K Capacitor, Ceramic 0805 1 µF, 25V, X7R, 10% 3 TDK C3 C1608X7R1H104K Capacitor, Ceramic 0603 0.1 µF, 50V, X7R, 10% 1 TDK C4 VJ0603A331JXAA Capacitor, Ceramic 0603 330 pF, 50V, COG, 5% 1 Vishay C5 VJ0603A150KXAA Capacitor, Ceramic 0603 15 pF, 50V, COG, 10% 1 Vishay C6 VJ0603Y152KXXA Capacitor, Ceramic 0603 1500 pF, 25V, X7R, 10% 1 Vishay C7 C1608X7R1C105K Capacitor, Ceramic 0603 1 µF, 16V, X7R, 10% 1 TDK C8, C9, C10, C11 C4532X7R2A225M Capacitor, Ceramic 1812 2.2 µF, 100V X7R, 20% 4 TDK C12 C3225X7R2A105M Capacitor, Ceramic 1210 1 µF, 100V X7R, 20% 1 TDK C13 C2012X7R2A104K Capacitor, Ceramic 0805 0.1 µF, 100V X7R, 10% 1 TDK C15 VJ0603A101KXAA Capacitor, Ceramic 0603 100 pF, 50V, COG, 10% 1 Vishay Capacitor, Polymer D Case 47 µF, 16V, 35mΩ 4 KEMET C4532X7R1C226M Capacitor, Ceramic 1812 22 µF, 16V, X7R, 20% 1 TDK Capacitor, Ceramic 1812 Not Used 0 EEV-FK2A470Q Capacitor, Electrolytic SMD 47 µF, 100V, Case Size: 12.5mm X 13.5mm 1 C16, C17, T520D476M016ATE03 C18, C19 5 C20 C21 C22 C23 D1, D2 CMPD2003 JMP1 0805 Not Used 0 Diode, Switching SOT-23 200 mA, 200V 2 2 pin sq. post 1 Connector, Jumper Central Semi L1 121KM1002H Inductor 10 µH, 8.72A, 10 mΩ 1 L1A PA2050.103NL Inductor 10 µH, 14.7A, 5.8 mΩ 0 Pulse P1-P4 1514-2 Turret Terminal .090” dia. 4 Keystone TP1-TP7 5012 Test Point .040” dia. 7 Keystone Q1, Q2 Si7852DP N-CH MOSFET SO-8 Power PAK 12.5A, 80V, 22 mΩ 2 Vishay Siliconix R1 CRCW06031023F Resistor 0603 102 kΩ, 1% 1 Vishay R2 CRCW06039311F Resistor 0603 9.31 kΩ, 1% 1 Vishay R3 CRCW06031072F Resistor 0603 10.7 kΩ, 1% 1 Vishay R4 CRCW06031211F Resistor 0603 1.21 kΩ, 1% 1 Vishay Resistor 0603 Not Used 0 R5 Gowanda R6, R7 CRCW06030R0J Resistor 0603 0Ω 2 Vishay R8 CRCW0603103J Resistor 0603 10 kΩ, 5% 1 Vishay R9 CRCW06031242F Resistor 0603 12.4 kΩ, 1% 1 Vishay R10 CRCW0603393J Resistor 0603 39 kΩ, 5% 1 Vishay R11 LRC-LRF2010-01R010-F Resistor 2010 0.010Ω, 1% 0 IRC R11 WSL2010R0100FEA Resistor 2010 0.010Ω, 1% 1 Vishay R12 CRCW06031R0J Resistor 0603 1Ω, 5% 1 Vishay R13 CRCW0603105J Resistor 0603 1 MΩ, 5% 1 Vishay Resistor 1206 Not Used 0 R14 6 Capacitor, Ceramic Panasonic R15 CRCW06037503F Resistor 0603 750 kΩ, 1% 1 Vishay R16 CRCW06032R2J Resistor 0603 2.2Ω, 5% 1 Vishay U1 LM5116 Synchronous Buck Controller HTSSOP-20 1 Texas Instruments AN-1713 LM5116-12 Evaluation Board SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated PCB Layout www.ti.com 5 PCB Layout SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback AN-1713 LM5116-12 Evaluation Board Copyright © 2007–2013, Texas Instruments Incorporated 7 PCB Layout 8 www.ti.com AN-1713 LM5116-12 Evaluation Board SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated PCB Layout www.ti.com SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback AN-1713 LM5116-12 Evaluation Board Copyright © 2007–2013, Texas Instruments Incorporated 9 PCB Layout 10 www.ti.com AN-1713 LM5116-12 Evaluation Board SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Evaluation Board Schematic www.ti.com 6 Evaluation Board Schematic Figure 15. Evaluation Board Schematic SNVA285A – October 2007 – Revised April 2013 Submit Documentation Feedback AN-1713 LM5116-12 Evaluation Board Copyright © 2007–2013, Texas Instruments Incorporated 11 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. 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