TPS51218EVM-496

www.ti.com Table of Contents User’s Guide TPS51218 Buck Controller Evaluation Module User's Guide ABSTRACT The TPS51218EVM evaluation module (EVM) is used to evaluate the TPS51218, a small-size, single buck controller with adaptive on-time D-CAP™ mode, providing a fixed 1.2-V output at up to 20 A from a 12-V input bus. Table of Contents 1 Description.............................................................................................................................................................................. 2 1.1 Typical Applications............................................................................................................................................................2 1.2 Features............................................................................................................................................................................. 2 2 Electrical Performance Specifications................................................................................................................................. 2 3 Schematic................................................................................................................................................................................3 4 Test Setup................................................................................................................................................................................4 4.1 Test Equipment.................................................................................................................................................................. 4 4.2 Recommended Test Setup.................................................................................................................................................5 5 Test Procedure........................................................................................................................................................................ 7 5.1 Line/Load Regulation and Efficiency Measurement Procedure......................................................................................... 7 5.2 List of Test Points............................................................................................................................................................... 7 5.3 Equipment Shutdown......................................................................................................................................................... 7 6 Performance Data and Typical Characteristic Curves........................................................................................................ 8 6.1 Efficiency............................................................................................................................................................................8 6.2 Load Regulation................................................................................................................................................................. 8 6.3 Transient Response........................................................................................................................................................... 9 6.4 Output Ripple................................................................................................................................................................... 10 6.5 Switch Node Voltage........................................................................................................................................................ 10 6.6 Turn-On Waveform........................................................................................................................................................... 11 6.7 Turn-Off Waveform........................................................................................................................................................... 11 6.8 Output 1.1-V Prebias Turn-On......................................................................................................................................... 12 7 EVM Assembly Drawing and PCB Layout.......................................................................................................................... 13 8 Bill of Materials..................................................................................................................................................................... 16 9 Revision History................................................................................................................................................................... 16 Trademarks D-CAP™ are trademarks of Texas Instruments. All trademarks are the property of their respective owners. SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 1 Description www.ti.com 1 Description The TPS51218EVM is designed to use a regulated 12-V bus to produce a regulated 1.2-V output at up to 20 A of load current. The TPS51218EVM is designed to demonstrate the TPS51218 in a typical, low-voltage application while providing a number of test points to evaluate the performance of the TPS51218. 1.1 Typical Applications • • • • • • • • High-current system converters for server and desktop power Switchers and routers Embedded computers In-vehicle infotainment PCs POS terminals Point-of-load modules Graphics cards Industrial control/factory automation PCs 1.2 Features The TPS51218EVM features: • • • • • • 20-ADC steady-state current Support prebias output voltage start-up 380-kHz switching frequency J4 for enable function J3 for auto-skip and forced CCM selection Convenient test points for probing critical waveforms 2 Electrical Performance Specifications Table 2-1. TPS51218EVM Electrical Performance Specifications Parameter Test Conditions Min Typ Max 8 12 14 Units INPUT CHARACTERISTICS Voltage range VIN Maximum input current VIN = 8 V, IO = 20 A No load input current VDC = 14 V, IO = 0 A 3.55 50 V A mA OUTPUT CHARACTERISTICS Output voltage, VOUT Output voltage regulation Output voltage ripple 1.2 Line regulation (VDC = 10 V–14 V) 1.0% Load regulation (VDC = 12 V, IO = 0 A–20 A) 1.0% VIN = 12 V, IO = 20 A Output load current 0 Output overcurrent V 40 mVpp 20 A 30 A 380 kHz SYSTEMS CHARACTERISTICS Switching frequency Peak efficiency VIN = 12 V, 1.2 V/10 A 90.32% Full-load efficiency VIN = 12 V, 1.2 V/20 A 88.64% Operating temperature 2 25 TPS51218 Buck Controller Evaluation Module User's Guide °C SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated PWM Mode ENABLE EN PGND PGOOD GND Not used PWM Mode selection : 1. Jumper on pin 2 and pin 3 of J3: Setting auto - skip mode ( Default setting ) 2. Jumper on pin 1 and pin 2 of J3: Setting forced CCM mode . Enable Notes : 1. Jumper shorted on J 4 to disable the controller .( Default setting ) 2. No jumper on J 4 to enable the controller . PGND PGND SW PGND Vin PGND Vout www.ti.com Schematic 3 Schematic Figure 3-1. TPS51218EVM Schematic SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 3 Test Setup www.ti.com 4 Test Setup 4.1 Test Equipment Voltage Source: The input voltage source, VIN, must be a 0-V to 14-V variable DC source capable of supplying 10 ADC. Connect VIN to J1 as shown in Figure 4-2. Multimeters: A 0-V to 15-V voltmeter must be used to measure VIN at TP6 (VIN) and TP7 (PGND) and a 0-V to 5-V voltmeter for VOUT measurement at TP8 (VOUT) and TP9 (PGND). A 0-A to 10-A current meter (A1) as shown in Figure 4-2 is used for input current measurements. Output Load: The output load must be an electronic constant resistance mode load capable of 0 ADC to 30 ADC at 1.2 V. Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope must be set for the following: • • • • • 1-MΩ impedance 20-MHz bandwidth AC coupling 2-µs/division horizontal resolution 50-mV/division vertical resolution Test points TP8 and TP9 can be used to measure the output ripple voltage by placing the oscilloscope probe tip through TP8 and holding the ground barrel TP9 as shown in Figure 4-1. Using a leaded ground connection can induce additional noise due to the large ground loop. Metal Ground Barrel Probe Tip TP8 TP9 Figure 4-1. Tip and Barrel Measurement for VOUT Ripple Fan: Some of the components in this EVM can get hot, approaching temperatures up to 60°C during operation. A small fan capable of 200 to 400 LFM is recommended to reduce component temperatures while the EVM is operating. The EVM must not be probed while the fan is not running. Recommended Wire Gauge: For VIN to J1 (12-V input), the recommended wire size is 1× AWG 14 per input connection, with the total length of wire less than four feet (2-foot input, 2-foot return). For J2 to LOAD, the minimum recommended wire size is 2× AWG 14, with the total length of wire less than four feet (2-foot output, 2-foot return). 4 TPS51218 Buck Controller Evaluation Module User's Guide SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup 4.2 Recommended Test Setup DC Source Vin + - + - A1 Load V1 V2 FAN TEXAS INSTRUMENTS Figure 4-2. TPS51218EVM Recommended Test Setup Figure 4-2 shows the recommended test setup to evaluate the TPS51218EVM. Working at an ESD workstation, ensure that any wrist straps, bootstraps, or mats are connected referencing the user to earth ground before power is applied to the EVM. 4.2.1 Configurations • • EN J4 setting 1. No jumper enables the controller. 2. A jumper shorted on J4 disables the controller (default setting). PWM J3 setting 1. A jumper on pin 2 and pin 3 of J3 set the auto-skip mode (default setting). 2. A jumper on pin 1 and pin 2 of J3 sets a forced CCM mode. 4.2.2 Input Connections 1. Prior to connecting the DC input source VIN, it is advisable to limit the source current from VIN to 10 A maximum. Ensure that VIN is initially set to 0 V and connected as shown in Figure 4-2. 2. Connect a voltmeter V1 at TP6 (VIN) and TP7 (PGND) to measure the input voltage. 3. Connect a current meter A1 to measure the input current. 4.2.3 Output Connections 1. Connect the load to J2, and set the load to constant resistance mode to sink 0 ADC before VIN is applied. 2. Connect a voltmeter V2 at TP8 (VOUT) and TP9 (PGND) to measure the output voltage. SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 5 Test Setup www.ti.com 4.2.4 Other Connections Place a fan as shown in Figure 4-2 and turn it on, making sure that air is flowing across the EVM. 6 TPS51218 Buck Controller Evaluation Module User's Guide SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Procedure 5 Test Procedure 5.1 Line/Load Regulation and Efficiency Measurement Procedure 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Ensure that the load is set to constant resistance mode and to sink 0 ADC. Ensure that the jumper provided in the EVM to short J4 is on before VIN is applied. Ensure that the jumper provided in the EVM to short pin 2 and pin 3 of J3 is on before VIN is applied. Increase VIN from 0 V to 12 V. Use V1 to measure the input voltage. Remove the jumper on J4 to enable the controller. Vary the load from 0 ADC to 20 ADC. VOUT must remain in load regulation. Vary VIN from 8 V to 14 V. VOUT must remain in line regulation. Put the jumper on J4 to disable the controller. Decrease the load to 0 A. Decrease VIN to 0 V. 5.2 List of Test Points Table 5-1. The Functions of Each Test Points Test Points Name Description TP1 EN Enable TP2 PGOOD Power Good TP3 GND GND TP4 PGND PGND TP5 SW Switching node TP6 Vin Vin TP7 PGND GND for Vin TP8 Vout Vout TP9 PGND PGND 5.3 Equipment Shutdown 1. Shut down the load. 2. Shut down VIN. 3. Shut down the fan. SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 7 Performance Data and Typical Characteristic Curves www.ti.com 6 Performance Data and Typical Characteristic Curves Figure 6-1 through Figure 6-9 present typical performance curves for the TPS51218EVM. 6.1 Efficiency 100 8 Vin auto skip 90 12 Vin auto skip 80 14 Vin auto skip Efficiency - % 70 8 Vin forced CCM 60 50 12 Vin forced CCM 40 14 Vin forced CCM 30 20 10 0 0.001 0.01 0.1 1 IO - Output Current - A 10 100 Figure 6-1. TPS51218EVM Efficiency 6.2 Load Regulation 1.27 1.26 VO - Output Volatge - V 14 Vin forced CCM 1.25 12 Vin forced CCM 8 Vin forced CCM 1.24 1.23 1.22 14 Vin auto skip 12 Vin auto skip 8 Vin auto skip 1.21 1.2 0.001 0.01 0.1 1 IO - Output Current - A 10 100 Figure 6-2. TPS51218 Load Regulation 8 TPS51218 Buck Controller Evaluation Module User's Guide SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Performance Data and Typical Characteristic Curves 6.3 Transient Response TPS51218EVM Transient Response 12 Vin, 1.2 V/5A-15A Auto skip CH1: 1.2 Voutput CH2: Output Current t - Time - 200 ms/div Figure 6-3. TPS51218EVM Load Transient TPS51218EVM Transient Response 12 Vin, 1.2 V/0A-10A Auto skip CH1: 1.2 Voutput CH2: Output Current t - Time - 200 ms/div Figure 6-4. TPS51218EVM Load Transient SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 9 Performance Data and Typical Characteristic Curves www.ti.com 6.4 Output Ripple TPS51218EVM Output Ripple 12 Vin, 1.2 V/20A Forced PWM CH1: 1.2 Vout Ripple t - Time - 2 ms/div Figure 6-5. Output Ripple 6.5 Switch Node Voltage TPS51218EVM Switching Node 12 Vin, 1.2 V/20A Forced PWM CH1: SW t - Time - 80 ns/div Figure 6-6. Switching Node Waveform 10 TPS51218 Buck Controller Evaluation Module User's Guide SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Performance Data and Typical Characteristic Curves 6.6 Turn-On Waveform TPS51218EVM Enable Start up 12 Vin, 1.2 V/20A Auto skip CH1: 12 Vin CH2: Enable CH3: 1.2 Vout CH4: PGOOD t - Time - 1 ms/div Figure 6-7. Enable Turn-On Waveform 6.7 Turn-Off Waveform TPS51218EVM Enable Shut down 12 Vin, 1.2 V/20A Auto skip CH1: 12 Vin CH2: Enable CH3: 1.2 Vout CH4: PDOOD t - Time - 1 ms/div Figure 6-8. Enable Turn-Off Waveform SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 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 6.8 Output 1.1-V Prebias Turn-On TPS51218EVM Enable Pre-bias start up 1.1 V output pre-bias 12 Vin, 1.2 V/0A forced PWM CH1: 1.2 Vin CH2: Enable CH3: 1.2 Vout CH4: PGOOD t - Time - 1 ms/div Figure 6-9. Output 1.1-V Prebias TurnOn 12 TPS51218 Buck Controller Evaluation Module User's Guide SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com EVM Assembly Drawing and PCB Layout 7 EVM Assembly Drawing and PCB Layout Figure 7-1 through Figure 7-6 show the design of the TPS51218EVM printed-circuit board. The EVM has been designed using a four-layer, 2-oz copper circuit board. TEXAS INSTRUMENTS Figure 7-1. TPS51218EVM Top Layer Assembly Drawing, Top View Figure 7-2. TPS51218EVM Bottom Assembly Drawing, Bottom View SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 13 EVM Assembly Drawing and PCB Layout www.ti.com Figure 7-3. TPS51218EVM Top Copper, Top View Figure 7-4. TPS51218EVM Internal Layer 1 14 TPS51218 Buck Controller Evaluation Module User's Guide SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com EVM Assembly Drawing and PCB Layout Figure 7-5. TPS51218EVM Internal Layer 2 Figure 7-6. TPS51218EVM Bottom Layer SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 TPS51218 Buck Controller Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 15 Bill of Materials www.ti.com 8 Bill of Materials The EVM components are shown in Table 8-1 according to the schematic shown in Figure 3-1. Table 8-1. Bill of Materials QTY REFDES Description MFR Part Number 2 C9, C12 Capacitor, Ceramic, 22 µF, 16 V, X5R, 10%, 1210 Murata GRM32ER61C226KE20L 1 C3 Capacitor, Ceramic, 1 µF, 16 V, X7R, 10%, 0603 STD STD 2 C1, C16 Capacitor, Ceramic, 0.022 µF, 16 V, X7R, 10%, 0603 STD STD 1 C8 Capacitor, Ceramic, 3300 pF, 25 V, X7R, 10%, 0603 STD STD 3 C4, C5, C6 Capacitor, Ceramic, 10 µF, 16 V, X5R, 10%, 0805 STD STD 2 C7, C17 Capacitor, Ceramic, 0.1 µF, 25 V, X7R, 10%, 0603 STD STD 5 C10, C11, C13, C14, C15 Capacitor, Ceramic, 100 µF, 6.3 V, X5R, 20%, 1210 Murata GRM32ER60J107ME20L 1 L1 Inductor, SMT, 0.44 µH, 30 A, 0.0032 Ω, 0.530" × 0.510" Pulse PA0513.441NLT E&E Magnetic 831-02990F 1 Q1 MOSFET, Nchan, 25 V, 21 A, 4.1 mΩ, QFN5X6mm TI (Ciclon) CSD16404Q5A 2 Q2, Q4 MOSFET, Nchan, 25 V, 31 A, 2.1 mΩ, QFN5X6mm TI(Ciclon) CSD16321Q5 3 R1, R11, R13 Resistor, Chip, 10 k, 1/16W, 1%, 0603 STD STD 1 R10 Resistor, Chip, 7.15 k, 1/16W, 1%, 0603 STD STD 1 R3 Resistor, Chip, 19.6 k, 1/16W, 1%, 0603 STD STD 2 R2, R12 Resistor, Chip, 100 k, 1/16W, 1%, 0603 STD STD 2 R6, R7 Resistor, Chip, 0, 1/16W, 1%, 0603 STD STD 1 R4 Resistor, Chip, 3.01, 1/16W, 1%, 0603 1 R5 Resistor, Chip, 2.37, 1/16W, 1%, 0603 STD STD 2 R8, R9 Resistor, Chip, 1, 1/16W, 5%, 0805 STD STD 1 U2 IC, Integrated LDO with switch-over circuit, DGS10 TI TPS51103DRC 1 U1 IC, Synchronous step-down controller, DSC10 TI TPS51218DSC 9 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (January 2010) to Revision A (February 2022) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 • Updated the user's guide title............................................................................................................................. 2 16 TPS51218 Buck Controller Evaluation Module User's Guide SLVU346A – JANUARY 2010 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 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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