LM3000EVAL

www.ti.com Table of Contents User’s Guide LM3000 Buck Controller Evaluation Module User's Guide Table of Contents 1 Introduction.............................................................................................................................................................................2 2 Powering and Loading Considerations................................................................................................................................ 3 2.1 Quick Setup Procedure...................................................................................................................................................... 3 3 Board Configuration...............................................................................................................................................................4 3.1 External Clock Synchronization......................................................................................................................................... 4 3.2 CLKOUT.............................................................................................................................................................................4 3.3 Tracking..............................................................................................................................................................................4 3.4 Output Voltage Ripple........................................................................................................................................................ 5 4 Typical Performance Waveforms.......................................................................................................................................... 6 5 Evaluation Board Schematic................................................................................................................................................. 7 6 Bill of Materials....................................................................................................................................................................... 8 7 PCB Layout............................................................................................................................................................................10 8 Revision History................................................................................................................................................................... 13 List of Figures Figure 2-1. Basic Test Setup for LM3000EVAL Board................................................................................................................. 3 Figure 3-1. Synchronization at 3.3-V Output............................................................................................................................... 4 Figure 3-2. Tracking with an External Ramp for 3.3-V Output..................................................................................................... 5 Figure 3-3. Output Voltage Ripple Measurement Setup.............................................................................................................. 5 Figure 4-1. Efficiency of 3.3-V Output at 500 kHz........................................................................................................................6 Figure 4-2. Efficiency of 1.2-V Output at 500 kHz........................................................................................................................6 Figure 4-3. Output Ripple Voltage for 3.3-V Output at 8-A Load................................................................................................. 6 Figure 4-4. Output Ripple Voltage for 1.2-V Output at 15-A Load............................................................................................... 6 Figure 4-5. Output Load Transient from 0 A to 6 A for 3.3-V Output........................................................................................... 6 Figure 4-6. Output Load Transient from 0 A to 10 A for 1.2-V Output......................................................................................... 6 Figure 5-1. Evaluation Board Full Schematic.............................................................................................................................. 7 Figure 7-1. Top Overlay as Viewed from Top.............................................................................................................................10 Figure 7-2. Top Layer as Viewed from Top................................................................................................................................ 10 Figure 7-3. Bottom Overlay as Viewed from Top....................................................................................................................... 11 Figure 7-4. Bottom Layer as Viewed from Top...........................................................................................................................11 Figure 7-5. Internal Layer 1 as Viewed from Top....................................................................................................................... 12 Figure 7-6. Internal Layer 2 as Viewed from Top....................................................................................................................... 12 List of Tables Table 6-1. Bill of Materials............................................................................................................................................................8 Trademarks All trademarks are the property of their respective owners. SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 1 Introduction www.ti.com 1 Introduction The LM3000 evaluation board is designed to provide the design engineer with a fully functional power converterbased solution using the LM3000 dual output emulated current mode controller. This evaluation board provides two output voltages of 3.3 V and 1.2 V. The 3.3-V output is designed to handle a maximum current of 8 A, whereas the 1.2-V output has a maximum current capability of 15 A. The switching frequency for the converter is set at 500 kHz. The gate signals for each output voltage will be 180 degree out of phase from each other. The printed circuit board consists of four layers of FR4 material with 2-ounce copper on top and bottom layer and 1-ounce copper for internal layers. This user's guide contains the evaluation board schematic, bill of materials (BOM), and a quick setup procedure. Refer to the LM3000 Dual Synchronous Emulated Current-Mode Controller data sheet for complete circuit design information. The performance of the evaluation board is as follows: Input Range 2 6 V to 18 V Output voltage 1 (VO1) 3.3 V Output current 1 0 A to 8 A Output voltage 2 (VO2) 1.2 V Output current 2 0 A to 15 A Switching frequency 500 kHz Load regulation 1% Board size 2.68 × 3.146 × 0.068 inches LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Powering and Loading Considerations 2 Powering and Loading Considerations Read this entire page prior to attempting to power the evaluation board. 2.1 Quick Setup Procedure 1. Set the input power supply current limit to 10 A. Turn off the input power supply. Connect the input power supply to the VIN terminal. Make sure to connect power supply ground to each GND1 and GND2 terminals in order to provide a short path for input current to return to the power supply. 2. Connect the load with an 8-A capability on VO1 and 15-A capability on VO2. Connect the positive terminal to VO1 and VO2 and negative terminal to GND1 and GND2. 3. Connect a secondary power supply to EN1 and EN2 terminals. Set the power supply voltage to 5 V. The ground return for this power supply should be connected to GND terminal. Since the evaluation board is configured such that VOUT2 tracks VOUT1, VOUT2 cannot be turned on without turning on VOUT1. Different configuration can be required in order to turn on VOUT2 independently. This will be discussed later in Section 3.3. 4. Set VIN to 12 V with no load being applied. Turn on the input power supply followed by the secondary power supply in order to power up the enable pins. The output voltage should be in regulation with a value of 3.3 V on VO1 and 1.2 V on VO2. 5. Slowly increase the load in each output into its maximum output current while monitoring the output voltages in each channel. The output voltages should also be in regulation at each respective maximum output current. 6. Slowly vary the input voltages from 6 V and 18.5 V. Both output voltages should remain in regulation with a nominal value of 3.3 V on VO1 and 1.2 V on VO2. Figure 2-1. Basic Test Setup for LM3000EVAL Board SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 3 Board Configuration www.ti.com 3 Board Configuration 3.1 External Clock Synchronization A SYNC terminal has been provided in this evaluation board in order to synchronize the converter to an external clock or other fixed frequency signal from 200 kHz to 1.5 MHz. Refer to the LM3000 Dual Synchronous Emulated Current-Mode Controller data sheet for complete information. Figure 3-1. Synchronization at 3.3-V Output 3.2 CLKOUT A CLKOUT terminal provides an external clock signal 90 degrees out of phase with the main clock. This clock signal can be used to synchronize a second LM3000. 3.3 Tracking The LM3000 evaluation board is configured such that VOUT2 tracks VOUT1, while VOUT1 voltage increases with a rate determined by the value of C17, the soft-start capacitor for VOUT1 (Condition 1). This configuration will not allow VOUT2 to be turned on independently without turning on VOUT1. In order to track VOUT1, the TRK2 pin should be connected to a divider junction between R14 and R15 through R26. When both outputs are used to track an external source (Condition 2), then R25, R26, and R28 should be left open and a 10-Ω resistor should be added into R24 and R27. If no tracking feature is required, both TRK1 and TRK2 should then be tied to VDD in order to soft start each output voltage based on a soft-start capacitor value (Condition 3). This can be done by keeping R24, R26, and R27 open while adding a 10-Ω resistor onto R25 and R28. Please note that the slew rate of track signal should be lower than the soft-start slew rate, which is set by soft-start capacitor value. The following are the summary of different tracking configuration on the LM3000EVAL board: Condition 4 R24 R25 R26 R27 R28 1 Open 10 Ω 10 Ω Open Open 2 10 Ω Open Open 10 Ω Open 3 Open 10 Ω Open Open 10 Ω LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Board Configuration Figure 3-2. Tracking with an External Ramp for 3.3-V Output 3.4 Output Voltage Ripple Output voltage ripple measurement should be taken directly across the output capacitor C21 or C22. Care has to be taken to minimize the loop area between the scope probe tip and the ground lead in order to minimize noise in the measurement. This can be achieved by removing the spring tip of the probe and ground lead and then wire a bare wire around the scope probe shaft. The bare wire should be in contact with the probe shaft because this is the “new” ground lead for the probe. The measurement can be taken by connecting the bare wire onto the ground side of the capacitor and the probe tip onto the other side of the capacitor. Figure 3-3 shows a diagram of this measurement technique. Figure 3-3. Output Voltage Ripple Measurement Setup SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 5 Typical Performance Waveforms www.ti.com 4 Typical Performance Waveforms 6 Figure 4-1. Efficiency of 3.3-V Output at 500 kHz Figure 4-2. Efficiency of 1.2-V Output at 500 kHz Figure 4-3. Output Ripple Voltage for 3.3-V Output at 8-A Load Figure 4-4. Output Ripple Voltage for 1.2-V Output at 15-A Load Figure 4-5. Output Load Transient from 0 A to 6 A for 3.3-V Output Figure 4-6. Output Load Transient from 0 A to 10 A for 1.2-V Output LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Evaluation Board Schematic 5 Evaluation Board Schematic Figure 5-1. Evaluation Board Full Schematic SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 7 Bill of Materials www.ti.com 6 Bill of Materials Table 6-1. Bill of Materials ID Part Number Type Size Parameters Qty Vendor C1, C2, C3, C4 GRM31CR6E106KA12L Capacitor, Ceramic 1206 10 µF, 25 V, X5R, 10% 4 Murata 7343-43 Not Used 0 C5 8 C6,C7, C8 EEF-UE0G221R Capacitor, Polymer 7343-43 220 µF, 4 V, 12 mΩ 3 Panasonic C9, C10, C11, C14 GRM188R61E105KA12D Capacitor, Ceramic 0603 1 µF, 25 V, X5R, 10% 4 Murata C12, C13, C30, C31 GRM188R71E104KA01D Capacitor, Ceramic 0603 0.1 µF, 25 V, X7R, 10% 4 Murata C15 VJ0603Y821KXXA Capacitor, Ceramic 0603 820 pF, 25 V, X7R, 10% 1 Vishay C16 VJ0603Y272KXXA Capacitor, Ceramic 0603 2.7 nF, 25 V, X7R, 10% 1 Vishay C17 06035C273KAT2A Capacitor, Ceramic 0603 0.027 µF, 50 V, X7R, 10% 1 AVX C18 VJ0603Y183KXXA Capacitor, Ceramic 0603 18 nF, 25 V, X7R, 10% 1 Vishay C19 VJ0603A121JXAA Capacitor, Ceramic 0603 120 pF, 50 V, COG, 5% 1 Vishay C20, C21 GRM31CR60J226KE19L Capacitor, Ceramic 1206 22 µF, 6.3 V, X5R, 10% 2 Murata C22 VJ0603A120KXAA Capacitor, Ceramic 0603 12 pF, 50 V, COG, 5% 1 Vishay C23 06031A270KAT2A Capacitor, Ceramic 0603 27 pF, 100 V, COG, 10% 1 AVX C24 06035C122KAT2A Capacitor, Electrolytic 0603 1200 pF, 50 V, X7R, 10% 1 AVX C25,C26 GRM188R71C104KA01D Capacitor, Ceramic 0603 0.1 µF, 16 V, X7R, 10% 2 Murata C27 06035A121JAT2A Capacitor, Ceramic 0603 120 pF, 50 V, COG, 5% 1 AVX C28, C29 EEEFK1H151P Capacitor, Aluminum 10x10.2 mm 150 µF, 50 V, 670 mA 2 Panasonic C32, C33 06031A180KAT2A Capacitor, Ceramic 0603 18 pF, 100 V, COG, 10% 2 AVX D1, D2 CMSH3-40M Diode, Schottky SMA 3 A, 40 V 2 Central Semiconductor D3 CMPD1001A Diode, Switching SOT-23 250 mA, 90 V 1 Central Semiconductor Dz1, Dz2 CMHZ4690 Diode, Zener SOD-123 5.6 V, 500 mW 2 Central Semiconductor L1 7443551280 Inductor 2.8 µH, 20 A, 3.8 mΩ 1 Wurth Elektronik L2 744318120 Inductor 1.2 µH, 22 A, 1.79 mΩ 1 Wurth Elektronik Q1, Q3 HAT2168H N-CH MOSFET LF-PAK 30 A, 30 V, 6 mΩ 2 Renesas Technology Q2, Q4 RJK0330DPB N-CH MOSFET LF-PAK 45A, 30V, 2.1 mΩ 2 Renesas Technology R1 CRCW060313k3FKEA Resistor 0603 13.3 kΩ, 1% 1 Vishay R2 CRCW06032k94FKEA Resistor 0603 2.94 kΩ, 1% 1 Vishay R3, R4 CRCW060322k6FKEA Resistor 0603 22.6 kΩ, 1% 2 Vishay R5 CRCW06033R01FNEA Resistor 0603 3.01 Ω, 1% 1 Vishay R6 CRCW06032k67FKEA Resistor 0603 2.67 kΩ, 1% 1 Vishay R7 CRCW06034k64FKEA Resistor 0603 4.64 kΩ, 1% 1 Vishay R8 CRCW06034M99FKEA Resistor 0603 4.99 MΩ, 1% 1 Vishay R9 CRCW060315k4FKEA Resistor 0603 15.4 kΩ, 1% 1 Vishay R10 CRCW060314k3FKEA Resistor 0603 14.3 kΩ, 1% 1 Vishay R11, R12 CRCW0603100kFKEA Resistor 0603 100 kΩ, 1% 2 Vishay R13 CRCW060342k2FKEA Resistor 0603 42.2 kΩ, 1% 1 Vishay R14 CRCW060335k7FKEA Resistor 0603 35.7 kΩ, 1% 1 Vishay LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Bill of Materials Table 6-1. Bill of Materials (continued) ID Part Number Type Size Parameters Qty Vendor R15 CRCW060310k0FKEA Resistor 0603 10 kΩ, 1% 1 Vishay R16, R17 CRCW06030000Z0EA Resistor 0603 0Ω 2 Vishay R18 CRCW060375k0FKEA Resistor 0603 75 kΩ , 1% 1 Vishay R19, R21 CRCW06031k33FKEA Resistor 0603 1.33 kΩ, 1% 2 Vishay R20 CRCW0603102kFKEA Resistor 0603 102 kΩ, 1% 1 Vishay R22, R23 CRCW040210R0FKED Resistor 0402 10 Ω, 1% 2 Vishay Resistor 0603 Not Used Resistor 0603 10 Ω, 1% 2 Vishay 1 Texas Instruments R24, R27, R28, R29, R30 R25, R26 CRC060310R0FKEA U1 LM3000 Controller 32 Lead WQFN VIN, VO1, VO2, GND1, GND2 1514-2 Turret Terminal 0.090" diameter 5 Keystone CLKOUT, PGOOD2, TRK2, EN2, GND 1573-2 Turret Terminal 0.072" diameter 5 Keystone GND, EN1, TRK1, PGOOD1, SYNC 1573-2 Turret Terminal 0.072" diameter 5 Keystone SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 9 PCB Layout www.ti.com 7 PCB Layout Figure 7-1. Top Overlay as Viewed from Top Figure 7-2. Top Layer as Viewed from Top 10 LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com PCB Layout Figure 7-3. Bottom Overlay as Viewed from Top Figure 7-4. Bottom Layer as Viewed from Top SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 11 PCB Layout www.ti.com Figure 7-5. Internal Layer 1 as Viewed from Top Figure 7-6. Internal Layer 2 as Viewed from Top 12 LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Revision History 8 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (May 2013) to Revision B (February 2022) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 • Updated the user's guide title............................................................................................................................. 2 SNVA389B – JULY 2009 – REVISED FEBRUARY 2022 Submit Document Feedback LM3000 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 13 IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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