TPS51220AEVM-476

www.ti.com Table of Contents User’s Guide TPS51220A Buck Controller Evaluation Module User's Guide Table of Contents 1 Introduction.............................................................................................................................................................................3 2 Description.............................................................................................................................................................................. 3 2.1 Typical Applications............................................................................................................................................................3 2.2 Features............................................................................................................................................................................. 3 3 Electrical Performance Specifications................................................................................................................................. 3 4 Schematic................................................................................................................................................................................5 5 Test Setup................................................................................................................................................................................6 5.1 Test Equipment.................................................................................................................................................................. 6 5.2 Recommended Test Setup.................................................................................................................................................6 5.3 List of Test Points............................................................................................................................................................... 7 6 Test Procedure........................................................................................................................................................................ 8 6.1 Line/Load Regulation and Efficiency Measurement Procedure......................................................................................... 8 6.2 Output Ripple Test..............................................................................................................................................................9 6.3 Measuring Improved Light Load Efficiency........................................................................................................................ 9 6.4 Control Architecture and OVP Select...............................................................................................................................10 6.5 Overcurrent Trip Level and Output Discharge Select.......................................................................................................10 7 Performance Data and Typical Characteristic Curves.......................................................................................................11 7.1 Efficiency.......................................................................................................................................................................... 11 7.2 Load Regulation............................................................................................................................................................... 11 7.3 Bode Plot..........................................................................................................................................................................12 7.4 Transient Response......................................................................................................................................................... 12 7.5 Output Ripple and Switch Node....................................................................................................................................... 13 7.6 Turn-On Waveform...........................................................................................................................................................13 7.7 Turn-Off Waveform...........................................................................................................................................................14 8 EVM Assembly Drawing and PCB Layout.......................................................................................................................... 15 9 List of Materials.....................................................................................................................................................................21 10 Revision History................................................................................................................................................................. 21 List of Figures Figure 4-1. TPS51220A EVM-476 Schematic............................................................................................................................. 5 Figure 5-1. TPS51220A EVM-476 Recommended Test Setup....................................................................................................6 Figure 5-2. Recommended Tip and Barrel Technique to Measure Output Ripple Voltage.......................................................... 6 Figure 7-1. Efficiency, 12 VIN, 5.0-V Output............................................................................................................................... 11 Figure 7-2. Efficiency, 12 VIN, 3.3-V Output............................................................................................................................... 11 Figure 7-3. 12 VIN, 5.0-V Load Regulation.................................................................................................................................11 Figure 7-4. 12 VIN, 3.3-V Load Regulation.................................................................................................................................11 Figure 7-5. CCM mode 5-V Loop Response Gain and Phase, fCO = 95 kHz, PM = 48°........................................................... 12 Figure 7-6. CCM mode 3.3-V Loop Response Gain and Phase, fCO = 90 kHz, PM = 63°........................................................ 12 Figure 7-7. 5-V CCM Mode Load Transient...............................................................................................................................12 Figure 7-8. 5-V D-CAP Mode Load Transient............................................................................................................................12 Figure 7-9. 5-V CCM Mode Output Ripple and Switch Node.................................................................................................... 13 Figure 7-10. 3.3-V CCM Mode Output Ripple............................................................................................................................13 Figure 7-11. Enable Turn-On Waveform.................................................................................................................................... 13 Figure 7-12. Enable Turn-Off With Discharge Waveform.......................................................................................................... 14 Figure 7-13. Enable Turn-Off Without Discharge Waveform..................................................................................................... 14 Figure 8-1. Top Layer Assembly Drawing (Top View)................................................................................................................ 15 Figure 8-2. Bottom Assembly Drawing (Top View).................................................................................................................... 16 Figure 8-3. Top Copper (Top View)............................................................................................................................................ 17 Figure 8-4. Internal Layer 1 (Top View)......................................................................................................................................18 SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 1 Trademarks www.ti.com Figure 8-5. Internal Layer 2 (Top View)......................................................................................................................................19 Figure 8-6. Bottom Copper (Top View)...................................................................................................................................... 20 List of Tables Table 3-1. TPS51220A EVM-476 Electrical Performance Specifications.................................................................................... 3 Table 5-1. Test Point Functions Found on the TPS51220A EVM-476......................................................................................... 7 Table 6-1. SKIPSEL1 or SKIPSEL2 (jumpers JP1 and JP4) Selections......................................................................................9 Table 6-2. FUNC (jumper JP2) Selections.................................................................................................................................10 Table 6-3. TRIP (JP3) Selections...............................................................................................................................................10 Table 9-1. EVM Components List According to Schematic Shown in Figure 4-1 ..................................................................... 21 Trademarks All trademarks are the property of their respective owners. 2 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Introduction 1 Introduction This EVM utilizes Texas Instrument’s TPS51220A in a dual output design. The device includes many test points to help the engineer monitor and evaluate the control characteristics of the TPS51220A. The TPS51220A is a dual peak current mode synchronous buck controller with three linear regulators. The EVM also allows the engineer to configure several of the features of the TPS51220A controller. 2 Description The TPS51220A EVM-476 provides two 8-A outputs: 3.3 V and 5 V. It accepts an input voltage from 8 V to 20 V. Several jumpers and switches allow the user to evaluate various control functions of the TPS51220A. Switches provide an easy method to enable and disable the EVM or each of the two outputs independently. Two jumper blocks allow the user to select the mode of operation of each output. One jumper block allows the engineer to select the control architecture and OVP function. One block allows for selection of overcurrent trip level and if the output is discharged by the converter. See the following sections for more details. 2.1 Typical Applications • • Notebook computers and I/O bus Point-of-load in such applications as digital TV and multi-function printers 2.2 Features • • • • • • • • • Input range from 8 V to 20 V Dual 8-A outputs: 3.3 V and 5 V Individual enable function for 3.3-V and 5-V output Selectable light load operation Selectable control architecture Inductor current sensing OVP disable function Output discharge disable function Test points for easy access to measure key parameters 3 Electrical Performance Specifications Table 3-1. TPS51220A EVM-476 Electrical Performance Specifications PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Characteristics Voltage range Maximum input current 8 12 VIN, both outputs at 8 A 12 20 V 5.8 A 5 V Output Characteristics Output voltage, VOUT 1 Output load current, IOUT1 Output voltage regulation Output voltage ripple 0 Line regulation: input voltage = 8 V to 20 V ±0.5% Load regulation: output current = 0 A to 8 A ±1% At IOUT1 = 8 A 8 A 50 mVpp Output over current 12 A Switching frequency 330 kHz Peak efficiency 97.8% Full load efficiency 96.9% Output voltage, VOUT 2 3.3 Output load current, IOUT2 Output voltage regulation Output voltage ripple 0 Line regulation: input voltage = 8 V to 20 V ±0.5% Load regulation: output current = 0 A to 8 A ±1% At IOUT = 8 A V 8 A 50 mVpp Output over current 12 A Switching frequency 330 kHz SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 3 Electrical Performance Specifications www.ti.com Table 3-1. TPS51220A EVM-476 Electrical Performance Specifications (continued) PARAMETER 4 TEST CONDITIONS MIN TYP Peak efficiency 96% Full load efficiency 95% TPS51220A Buck Controller Evaluation Module User's Guide MAX UNITS SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Schematic + + + + + + 4 Schematic Figure 4-1. TPS51220A EVM-476 Schematic SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 5 Test Setup www.ti.com 5 Test Setup 5.1 Test Equipment Voltage Source: The power source must be capable of supplying 8 VDC to 20 VDC at up to 10 A. Multimeters: A minimum of three voltage meters are required. Other voltage meters can be used to monitor some of the test points. Output Load: Two constant current electronic loads are recommended. They must be able to sink up to 10 A when the output is 3.3 V or 5 V. Oscilloscope: A minimum 50-MHz digital oscilloscope and a voltage probe is required. The scope can be used to measure output ripple and monitor some of the test points. Fan: A fan is not required when testing the EVM. Recommended Wire Gauge: Both loads and input should be connected using a minimum gauge wire of AWG#16. Also these connections should be kept as short as possible. 5.2 Recommended Test Setup V4 V3 V5 + Electronic Load #1. - 5V/8A V1 V6 + 12V/10A DC Power - Source + Electronic Load #2. - 3.3V/8A V2 Figure 5-1. TPS51220A EVM-476 Recommended Test Setup Metal Ground Barrel Probe Tip TP2 (TP3) TP7 (TP8) Figure 5-2. Recommended Tip and Barrel Technique to Measure Output Ripple Voltage 6 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup 5.3 List of Test Points Table 5-1. Test Point Functions Found on the TPS51220A EVM-476 TEST POINT NAME TP1 VIN TP2 VOUT1 Measurement point for output 1 voltage with respect to TP7 TP3 VOUT2 Measurement point for output 2 voltage with respect to TP8 TP4 SW1 TP5 VREG5 DESCRIPTION Measurement point for input voltage with respect to TP18 Output 1 switch node with respect to TP20 5-V/100-mA output, enabled EN is high, use switch S3 TP6 SW2 TP7 GND1 Output 2 switch node with respect to TP21 Ground reference for VOUT1 TP8 GND2 Ground reference for VOUT2 TP9 VREG3 TP10 EN1 Output 1 enable signal, will be high when output is enabled via switch S1 TP11 EN2 Output 2 enable signal, will be high when output is enabled via switch S2 TP12 PG1 Output 1 power good signal, will be high when output is in regulation TP13 PG2 Output 2 power good signal, will be high when output is in regulation 3.3-V/10-mA output should be present when input voltage is applied to EVM. TP14 EN TP15 VREF2 5-V and 2-V reference enable signal, high when EVM is enabled with switch S3 TP16 – Not used TP17 – Not used TP18 GNDIN Ground reference for VIN TP19 GNDS General ground TP20 GND Ground reference for SW1 TP21 GND Ground reference for SW2 TP22 GND General ground TP23 GND General ground TP24 SYNC Not used 2-V internal reference, enabled when EN is high, use switch S3 SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 7 Test Procedure www.ti.com 6 Test Procedure 6.1 Line/Load Regulation and Efficiency Measurement Procedure 1. Ensure the switches S1 (EN1), S2 (EN2), and S3 (EN) are in the “OFF” position. 2. Ensure the shunt jumper are set as follows, see Section 6.3, Section 6.4, and Section 6.5 for details on how to change these settings: a. JP1 (SKIPSEL1): jumper 3 pin to 4 pin (AS) b. JP2 (FUNC): jumper 1 pin to 2 pin (CMODE_ON) c. JP3 (TRIP): jumper 7 pin to 8 pin (LV_D-ON) d. JP4 (SKIPSEL2): jumper 3 pin to 4 pin (AS) 3. Set the DC power source current limit to 10 A. Increase VIN voltage from 0 V to 8 VDC. V3 should be used to verify VIN. 4. Measure VREG3 (TP9) voltage using V4. It should be between 3.2 V and 3.4 V. 5. Set S3 (EN) to “ON” position. Measure VREG5 (TP5) voltage using V5, it should read between 4.9 V and 5.1 V. Measure VREF2 (TP15) voltage using V6, it should read 1.98 V to 2.02 V. 6. Make sure electronic load #1 is set to sink 0 A. Set S1 (EN1) to “ON” position, S3 remains in “ON” position. 7. Record VOUT1 voltage using V1, IOUT1 current, VIN using V3 and input current from source. 8. Increase electronic load #1’s current in 0.5-A steps from 0 A to 8 A, Record VOUT1 voltage using V1, IOUT1 current, VIN using V3 and input current from source for each step. 9. Set input voltage to 20 V. 10. Reduce the current of electronic load #1 from 8 A to 0 A, the current electronic load #1 in 0.5-A steps from 0 A to 8 A. Record VOUT1 voltage using V1, IOUT1 current, VIN using V3 and input current from source for each step. 11. Similar technique can be used for VOUT2. Use S2 to enable VOUT2. 8 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Procedure 6.2 Output Ripple Test 1. Use steps 1 to 6 of Section 6.1 to start output. 2. Set up the scope as follows: a. HORIZONTAL SWEEP: 2 μs/div b. TRIGGER MODE: auto, rising edge c. TRIGGER SOURCE: Ch1 d. CH1: 50 mV/div, AC coupled, bandwidth 20 MHz 3. Use the tip and barrel technique shown in Figure 5-2 to probe VOUT1 and VOUT2 during test procedure. 6.3 Measuring Improved Light Load Efficiency 1. All jumper modifications should be done with no power applied to the EVM 2. SKIPSEL1 and SKIPSEL2 allow the user to select how the EVM operates when in light load. Table 6-1 describes each possible selection. Table 6-1. SKIPSEL1 or SKIPSEL2 (jumpers JP1 and JP4) Selections JUMPER LOCATION MODE DESCRIPTION CCM (1 and 2 shorted) CCM EVM remains in continuous current mode AS (3 and 4 shorted) default Auto-skip EVM enters auto skip mode at light load, audible noise may be heard. OOA_L (5 and 6 shorted) OOA (< 400 kHz) EVM enters skip mode with no audible noise OOA_H (7 and 8 shorted) OOA (> 400 kHz) Not recommended 3. Once a mode has been selected, efficiency and regulation measurements may be retaken. Repeat steps 3 to 11 of Section 6.1. The engineer should reduce the step current when the output is less than 1 A. Section 7 shows typical data for the various modes of operation SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 9 Test Procedure www.ti.com 6.4 Control Architecture and OVP Select 1. All jumper modifications should be done with no power applied to the EVM. 2. The FUNC jumper (JP2) allows the user to select the control architecture the EVM uses to control the output. It also enables or disables the OVP function. Table 6-2 describes each possible selection. Table 6-2. FUNC (jumper JP2) Selections JUMPER LOCATION MODE CMODE_ON (1 and 2 shorted) default Current mode control and OVP enabled DCAP_OFF (3 and 4 shorted) D-Cap mode control and OVP disabled DCAP_ON (5 and 6 shorted) D-Cap mode control and OVP enabled CMODE_OFF (7 and 8 shorted) Current mode control and OVP disabled 3. Once a mode has been selected efficiency and regulation measurements may be retaken. Repeat steps 3 to 11 of Section 6.1. The engineer should reduce the step current when the output is less than 1 A. Section 7 shows typical data for the various modes of operation 6.5 Overcurrent Trip Level and Output Discharge Select 1. All jumper modifications should be done with no power applied to the EVM. 2. The TRIP jumper (JP3) allows the user to select the voltage level used by the EVM to implement current limit. It also enables or disables the output discharge function. Table 6-3 describes each possible selection. Table 6-3. TRIP (JP3) Selections JUMPER LOCATION MODE UL_D-ON (1 and 2 shorted) Overcurrent uses ultra low voltage threshold (31 mV typical) and output discharge is enabled UL_OFF (3 and 4 shorted) Overcurrent uses ultra low voltage threshold (31 mV typical) and output discharge is disabled LV_OFF (5 and 6 shorted) Overcurrent uses low voltage threshold (60 mV typical) and output discharge is disabled LV_D-ON (7 and 8 shorted) default Overcurrent uses low voltage threshold (60 mV typical) and output discharge is enabled 3. Once a mode has been selected efficiency and regulation measurements may be retaken. Repeat steps 3 to 11 of Section 6.1. The engineer should reduce the step current when the output is less than 1 A. Section 7 shows typical data for the various modes of operation 10 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Performance Data and Typical Characteristic Curves 7 Performance Data and Typical Characteristic Curves 100 100 90 90 80 80 70 70 h - Efficiency - % h - Efficiency - % 7.1 Efficiency 60 50 40 30 60 50 40 AUTOSKIP 30 AUTOSKIP 20 OOA 20 OOA 10 CCM 10 CCM 0 0 0.01 0.10 1.00 10.00 0.01 0.10 ILOAD - Load Current - A 1.00 10.00 ILOAD - Load Current - A Figure 7-1. Efficiency, 12 VIN, 5.0-V Output Figure 7-2. Efficiency, 12 VIN, 3.3-V Output 7.2 Load Regulation 3.32 5.04 AUTOSKIP 5.03 OOA AUTOSKIP 3.31 VOUT - Output Voltage - V VOUT - Output Voltage - V 5.05 CCM 5.02 5.01 5.00 4.99 4.98 OOA CCM 3.30 3.29 3.28 3.27 4.97 3.26 4.96 4.95 3.25 0 1 2 3 4 5 6 7 8 ILOAD - Load Current - A Figure 7-3. 12 VIN, 5.0-V Load Regulation 9 0 1 2 3 4 5 6 7 8 9 ILOAD - Load Current - A Figure 7-4. 12 VIN, 3.3-V Load Regulation SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 11 Performance Data and Typical Characteristic Curves www.ti.com 7.3 Bode Plot 135 40 Phase 30 30 90 20 Phase 90 20 -10 Gain 0 45 Phase - o 45 0 Gain - dB 10 Gain Phase - o Gain - dB 10 135 40 -10 0 -20 -30 0 -20 -30 -45 -40 1 10 100 1000 -45 -40 1 10 100 1000 Frequency - kHz Frequency - kHz Figure 7-5. CCM mode 5-V Loop Response Gain and Phase, fCO = 95 kHz, PM = 48° Figure 7-6. CCM mode 3.3-V Loop Response Gain and Phase, fCO = 90 kHz, PM = 63° 7.4 Transient Response Figure 7-7. 5-V CCM Mode Load Transient 12 TPS51220A Buck Controller Evaluation Module User's Guide Figure 7-8. 5-V D-CAP Mode Load Transient SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Performance Data and Typical Characteristic Curves 7.5 Output Ripple and Switch Node Figure 7-9. 5-V CCM Mode Output Ripple and Switch Node Figure 7-10. 3.3-V CCM Mode Output Ripple 7.6 Turn-On Waveform Figure 7-11. Enable Turn-On Waveform SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 13 Performance Data and Typical Characteristic Curves www.ti.com 7.7 Turn-Off Waveform Figure 7-12. Enable Turn-Off With Discharge Waveform 14 TPS51220A Buck Controller Evaluation Module User's Guide Figure 7-13. Enable Turn-Off Without Discharge Waveform SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com EVM Assembly Drawing and PCB Layout 8 EVM Assembly Drawing and PCB Layout The following figures (Figure 8-1 through Figure 8-6) show the design of the TPS51220A EVM-476 printed circuit board. The PCB is 0.062” thick. It uses four layers of copper. The two internal layers are 2-oz copper while the external layers are 1-oz copper. Figure 8-1. Top Layer Assembly Drawing (Top View) SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 15 EVM Assembly Drawing and PCB Layout www.ti.com Figure 8-2. Bottom Assembly Drawing (Top View) 16 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com EVM Assembly Drawing and PCB Layout Figure 8-3. Top Copper (Top View) SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 17 EVM Assembly Drawing and PCB Layout www.ti.com Figure 8-4. Internal Layer 1 (Top View) 18 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com EVM Assembly Drawing and PCB Layout Figure 8-5. Internal Layer 2 (Top View) SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 19 EVM Assembly Drawing and PCB Layout www.ti.com Figure 8-6. Bottom Copper (Top View) 20 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com List of Materials 9 List of Materials Table 9-1. EVM Components List According to Schematic Shown in Figure 4-1 QTY REFDES DESCRIPTION MFR PART NUMBER 4 C1, C2, C4, C5 Capacitor, ceramic, 10 μF, 25 V, X7R, ±10%, 1210 muRata GRM32DR71E106K 2 C10, C11 Capacitor, POS-CAP, 330 μF, 6.3 V, 18 mΩ, 20% SANYO 6TPE330MIL 2 C14, C15 Capacitor, POS-CAP, 470 μF, 4.0 V, 15 mΩ, 20% SANYO 4TPE470MFL 3 C16, C17, C21 Capacitor, ceramic, 0.01 μF, 50 V, X7R, ±10%, 0603 Std Std 4 C20, C23, C26, C27 Capacitor, ceramic, 100 pF, 50 V, C0G, ±5%, 0603 Std Std 1 C22 Capacitor, ceramic, 2.2 μF, 6.3 V, X5R, ±10%, 0603 Std Std 1 C28 Capacitor, ceramic, 47 pF, 50 V, C0G, ±5%. 0603 Std Std 6 C3, C6, C18, C19, C24, C25 Capacitor, ceramic, 0.1 μF, 50 V, X7R, ±10%, 0603 Std Std 1 C8 Capacitor, ceramic, 0.22 μF, 25 V, X7R, ±10%, 0603 Std Std 1 C9 Capacitor, ceramic, 10 μF, 6.3 V, X5R, ±10%, 0805 TDK C2012X5R0J106K 2 D1, D2 Diode, Schottky, 40 V, 30 mA, SOD-323 Rohm RB751x-40 2 L1, L2 Inductor, 3.3-µH, 12 A Vishay IHLP5050CEER3R3 2 Q1, Q2 MOSFET, N-ch, 30 V, 14 A, 9.7 mΩ TI CSD17307Q5A 2 Q3, Q4 MOSFET, N-ch, 30 V, 21 A, 4.5 mΩ TI CSD17310Q5A 11 R1, R2, R9, R12, R13, R14, R16, R17, R23, R34, R37 Resistor, chip, 0 Ω, 1/16 W, ±5%, 0603 Std Std 1 R20 Resistor, chip, 300 kΩ, 1/16 W, ±1%, 0603 Std Std 1 R21 Resistor, chip, 8.20 kΩ, 1/16 W, ±1%, 0603 Std Std 1 R22 Resistor, chip, 7.50 kΩ, 1/16 W, ±1%, 0603 Std Std 2 R24, R25 Resistor, chip, 5.60 kΩ, 1/16 W, ±1%, 0603 Std Std 2 R26, R29 Resistor, chip, 51.1 Ω, 1/16 W, ±1%, 0603 Std Std 1 R27 Resistor, chip, 120 kΩ, 1/16 W, ±1%, 0603 Std Std 1 R28 Resistor, chip, 62.0 kΩ, 1/16 W, ±1%, 0603 Std Std 1 R30 Resistor, chip, 30.0 kΩ, 1/16 W, ±1%, 0603 Std Std 1 R31 Resistor, chip, 27.0 kΩ, 1/16 W, ±1%, 0603 Std Std 1 R38 Resistor, chip, 15.0 kΩ, 1/16 W, ±1%, 0603 Std Std 1 R39 Resistor, chip, 12.0 kΩ, 1/16 W, ±1%, 0603 Std Std 2 R5, R6 Resistor, chip, 15.4 Ω, 1/16 W, ±1%, 0603 Std Std 2 R7, R15 Resistor, chip, 470 kΩ, 1/16 W, ±1%, 0603 Std Std 1 U1 Fixed frequency 99% duty cycle, dual buck controller TI TPS51220ARTV 10 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (May 2011) to Revision B (February 2022) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................3 • Updated the user's guide title............................................................................................................................. 3 SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022 TPS51220A Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 21 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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