User's Guide SLVU353 – November 2009 TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module 1 2 3 4 Contents Introduction .................................................................................................................. 2 1.1 Background ......................................................................................................... 2 1.2 Performance Specification Summary ............................................................................ 2 1.3 Modifications ........................................................................................................ 3 Test Setup and Results .................................................................................................... 3 2.1 Input / Output Connections ....................................................................................... 3 2.2 Start Up Procedure ................................................................................................ 4 2.3 Efficiency ............................................................................................................ 4 2.4 Load Regulation .................................................................................................... 5 2.5 Line Regulation ..................................................................................................... 5 2.6 Load Transient Response ........................................................................................ 6 2.7 Output Voltage Ripple ............................................................................................. 6 2.8 Input Voltage Ripple ............................................................................................... 7 2.9 Start Up .............................................................................................................. 7 2.10 Switching Frequency .............................................................................................. 8 Board Layout ................................................................................................................ 8 3.1 Layout ............................................................................................................... 8 Schematic, Bill of Materials and Reference ............................................................................ 12 4.1 Schematic ......................................................................................................... 12 4.2 Bill of Materials .................................................................................................... 13 4.3 Reference .......................................................................................................... 13 List of Figures 1 TPS54326EVM-540 Efficiency ............................................................................................ 4 2 TPS54326EVM-540 Load Regulation .................................................................................... 5 3 TPS54326EVM-540 Line Regulation ..................................................................................... 5 4 TPS54326EVM-540 Load Transient Response ......................................................................... 6 5 TPS54326EVM-540 Output Voltage Ripple ............................................................................. 6 6 TPS54326EVM-540 Input Voltage Ripple ............................................................................... 7 7 TPS54326EVM-540 Start Up .............................................................................................. 7 8 TPS54326-540 Switching Frequency 9 Top Assembly ............................................................................................................... 9 10 Top Layer ................................................................................................................... 10 11 Internal Layer 1 ............................................................................................................ 10 12 Internal Layer 2 ............................................................................................................ 11 13 Bottom Layer ............................................................................................................... 11 14 Bottom Assembly .......................................................................................................... 11 15 TPS54326EVM-540 Schematic Diagram............................................................................... 12 .................................................................................... 8 List of Tables D-CAP2 is a trademark of Texas Instruments. SLVU353 – November 2009 Submit Documentation Feedback TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated 1 Introduction 1 www.ti.com 1 Input Voltage and Output Current Summary ............................................................................ 2 2 TPS54326 EVM and Performance Specifications Summary .......................................................... 2 3 Output Voltages ............................................................................................................. 3 4 Connection and Test Points ............................................................................................... 4 5 Bill of Materials............................................................................................................. 13 Introduction This user’s guide contains background information for the TPS54326 as well as support documentation for the TPS54326EVM-540 evaluation module. Also included are the performance specifications, schematic and the bill of materials for the TPS54326EVM-540. 1.1 Background The TPS54326 is a single, adaptive on-time D-CAP2™ mode synchronous buck converter requiring a very low external component count. The D-CAP2™ control circuit is optimized for low ESR output capacitors such as POSCAP, SP-CAP or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 700 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS54326 package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFETs allow the TPS54326 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The TPS54226 also has an Auto-Skip mode to enable higher efficiency at light loads. The TPS54326 dc/dc synchronous converter is designed to provide up to a 2A output from an input control voltage source of 4.5V to 18V, input power voltage source of 2V to 18V and output voltage from 0.76V to 5.5V. Rated input voltage, output voltage and output current range for the evaluation module are given in Table 1. Table 1. Input Voltage and Output Current Summary 1.2 EVM Input Voltage Range Output Voltage and Current Range TPS54326EVM-540 VIN = 4.5V to 18V Vout = 1.05 V, 0A to 2A Performance Specification Summary A summary of the TPS54326EVM-540 performance specifications is provided in Table 2. Specifications are given for an input voltage of VIN = 12V and an output voltage of 1.05V, unless otherwise noted. The ambient temperature is 25°C for all measurement, unless otherwise noted. Table 2. TPS54326 EVM and Performance Specifications Summary Specifications Test Conditions Input voltage range (VIN) Min Typ Max 4.5 12 18 Output voltage Operating frequency CH1 2 1.05 VIN = 12V, IO = 1A Output current range Over current limit VIN = 12V Output ripple voltage VIN = 12V, IO = 3A TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated kHz 3 4.1 7 V V 700 0 Unit A A mVPP SLVU353 – November 2009 Submit Documentation Feedback Test Setup and Results www.ti.com 1.3 Modifications These evaluation modules are designed to provide access to the features of the TPS54326. Some modifications can be made to this module. 1.3.1 Output Voltage Set Point To change the output voltage of the EVMs, it is necessary to change the value of resistor R1. Changing the value of R1 can change the output voltage above 0.765V. The value of R1 for a specific output voltage can be calculated using Equation 1 and Equation 2. For output voltage from 0.76V to 2.5V: æ R1 ö VO = 0.765 ´ ç 1+ ÷ è R2 ø (1) For output voltage over 2.5V: æ R1 ö VO = (0.763 + 0.0017 ´ VO ) ´ ç 1+ ÷ è R2 ø (2) Table 3 lists the R1 value for some common output voltages. For higher output voltages, a feed forward capacitor is required. Pads for this component (C2) are provided on the printed circuit board. C2 is used for faster load transient response and is recommended for auto skip mode stability. Note that the values given in Table 3 are standard values, and not the exact value calculated using Table 3. Table 3. Output Voltages 2 Output Voltage (V) R1 (kΩ) R2 (kΩ) C2 (pF) L1 (µH) 1.0 6.81 22.1 1.5 1.05 8.25 22.1 1.5 1.2 12.7 22.1 1.8 30.1 22.1 150-220 2.2 2.5 49.9 22.1 68-100 2.2 3.3 73.2 22.1 47 - 68 2.2 5.0 121 22.1 33 - 47 3.3 1.5 Test Setup and Results This section describes how to properly connect, set up, and use the TPS54326EVM-540. The section also includes test results typical for the evaluation modules and efficiency, output load regulation, output line regulation, load transient response, output voltage ripple, input voltage ripple, start up and switching frequency. 2.1 Input / Output Connections The TPS5326EVM-540 is provided with input/output connectors and test points as shown in Table 4. A power supply capable of supplying 3 A must be connected to J1 through a pair of 20 AWG wires. The load must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability is 3 A. Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to monitor the VIN input voltages with TP2 providing a convenient ground reference. TP8 is used to monitor the output voltage with TP9 as the ground reference. SLVU353 – November 2009 Submit Documentation Feedback TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated 3 Test Setup and Results www.ti.com Table 4. Connection and Test Points 2.2 Reference Designator Function J1 VIN (see Table 1 for VIN range) J2 VOUT, 1.05 V at 3 A maximum JP1 EN control. Connect EN to OFF to disable, connect EN to ON to enable. TP1 VIN test point at VIN connector TP2 GND test point at VIN TP3 EN test point TP4 VCC test point TP5 Analog ground test point TP6 Switch node test point TP7 Power good test point TP8 Output voltage test point TP9 Ground test point at output connector Start Up Procedure 1. Make sure the jumper at JP1 (Enable control) is set from EN to OFF. 2. Apply appropriate VIN voltage to VIN and PGND terminals at J1. 3. Move the jumper at JP1 (Enable control) to cover EN and ON. The EVM will enable the output voltage. 2.3 Efficiency Figure 1 shows the efficiency for the TPS54326EVM-540 at an ambient temperature of 25°C. 90 80 VI = 5 V 70 Efficiency - % VI = 12 V 60 50 40 30 20 10 0.001 0.01 0.1 1 10 IO - Output Current - A Figure 1. TPS54326EVM-540 Efficiency 4 TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated SLVU353 – November 2009 Submit Documentation Feedback Test Setup and Results www.ti.com 2.4 Load Regulation The load regulation for the TPS54326EVM-540 is shown Figure 2. 1.2 VI = 5 V Output Voltage Deviation - % 0.9 0.6 0.3 VI = 12 V 0 -0.3 0 0.5 1 1.5 2 IO - Output Current - A 2.5 3 3.5 Figure 2. TPS54326EVM-540 Load Regulation 2.5 Line Regulation The line regulation for the TPS54326EVM-540 is shown Figure 3. 1.065 IO = 0.001 A VO - Output Voltage - V 1.06 1.055 IO = 1.5 A 1.05 IO = 3 A 1.045 4 8 12 VI - Input Voltage - V 16 20 Figure 3. TPS54326EVM-540 Line Regulation SLVU353 – November 2009 Submit Documentation Feedback TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated 5 Test Setup and Results 2.6 www.ti.com Load Transient Response The TPS54326EVM-540 response to load transient is shown in Figure 4. The current step is from 0.75 A to 2.25 A (25% to 75% of rated load). Total peak-to-peak output voltage variation is as shown. VO = 50 mV/div (AC Coupled) IO = 1 A/div 0.75 to 2.25 A Load Step t - Time = 200 ms/div Figure 4. TPS54326EVM-540 Load Transient Response 2.7 Output Voltage Ripple The TPS54326EVM-540 output voltage ripple is shown in Figure 5. The output current is the rated full load of 3A. VO = 50 mV/div (AC Coupled) Switching Node = 5 V/div t - Time = 500 ns/div Figure 5. TPS54326EVM-540 Output Voltage Ripple 6 TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated SLVU353 – November 2009 Submit Documentation Feedback Test Setup and Results www.ti.com 2.8 Input Voltage Ripple The TPS54326EVM-540 input voltage ripple is shown in Figure 6. The output current is the rated full load of 3A. VI = 50 mV/div (AC Coupled) Switching Node = 5 V/div t - Time = 500 ns/div Figure 6. TPS54326EVM-540 Input Voltage Ripple 2.9 Start Up The TPS54326EVM-540 start up waveform is shown in Figure 7. EN = 10 V/div VOUT = 500 mV/div PG = 5 V/div Time = 500 ms/div Figure 7. TPS54326EVM-540 Start Up SLVU353 – November 2009 Submit Documentation Feedback TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated 7 Board Layout www.ti.com 2.10 Switching Frequency The TPS54326EVM-540 switching frequency is shown in Figure 8. 900 fsw - Switching Frequency - kHz IO = 1 A 800 VO = 1.8 V 700 600 VO = 3.3 V 500 0 5 10 VI - Input Voltage - V 15 20 Figure 8. TPS54326-540 Switching Frequency 3 Board Layout This section provides description of the TPS54326EVM-540, board layout, and layer illustrations. 3.1 Layout The board layout for the TPS54326EVM-540 and is shown in Figure 9 through Figure 14. The top layer contains the main power traces for VIN, VO and ground. Also on the top layer are connections for the pins of the TPS54326 and a large area filled with ground. Many of the signal traces are also located on the top side. The input decoupling capacitor are located as close to the IC as possible. The input and output connectors, test points and most of the components are located on the top side. R3, the 0-Ω resistor that connects VIN to VCC and R4, the power good pull up, are located on the back side. Analog ground and power ground are connected at a single point on the top layer near pin 5 of the TPS54326. The internal layer 1 is a split plane containing analog and power grounds. The internal layer 2 is primarily power ground. There are also a fill area of VIN and a trace routing VCC to the enable control jumper JP1. The bottom layer is primarily analog ground. There are also traces to connect VIN to VCC through R3, traces for the power good signal and the feedback trace from VOUT to the voltage setpoint divider network. 8 TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated SLVU353 – November 2009 Submit Documentation Feedback Board Layout www.ti.com Figure 9. Top Assembly Figure 10. Top Layer SLVU353 – November 2009 Submit Documentation Feedback TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated 9 Board Layout www.ti.com Figure 11. Internal Layer 1 Figure 12. Internal Layer 2 10 TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated SLVU353 – November 2009 Submit Documentation Feedback Board Layout www.ti.com Figure 13. Bottom Layer Figure 14. Bottom Assembly SLVU353 – November 2009 Submit Documentation Feedback TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated 11 Schematic, Bill of Materials and Reference 4 www.ti.com Schematic, Bill of Materials and Reference This section presents the TPS54326EVM-540 schematic, bill of materials and reference. 4.1 Schematic Figure 15 is the schematic for the TPS54326EVM-540. Figure 15. TPS54326EVM-540 Schematic Diagram 12 TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated SLVU353 – November 2009 Submit Documentation Feedback Schematic, Bill of Materials and Reference www.ti.com 4.2 Bill of Materials Table 5. Bill of Materials RefDes QTY Value Description Size Part Number MFR C1, C3 2 10uF Capacitor, Ceramic, 25V, X5R, 20% 1210 C3225X5R1E106M TDK C11 0 Open Capacitor, Ceramic 1206 Std Std C2, C4, C8 0 Open Capacitor, Ceramic 0603 Std Std C5 1 3300pF Capacitor, Ceramic, 25V, X7R , 10% 0603 Std Std C6 1 1uF Capacitor, Ceramic, 16V, X7R, 10% 0603 Std Std C7 1 0.1uF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std C9, C10 2 22uF Capacitor, Ceramic, 6.3V, X5R, 20% 1206 C3216X5R0J226M TDK J1, J2 2 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 inch ED555/2DS Sullins JP1 1 PEC03SAAN Header, Male 3-pin, 100mil spacing 0.100 inch x 3 PEC03SAAN Sullins L1 1 1.5uH Inductor, SMT, 11.5 A, 9.7 milliohm 0.256 x 0.280 inch SPM6530T-1R5M100 TDK R1 1 8.25k Resistor, Chip, 1/16W, 1% 0603 Std Std R2 1 22.1k Resistor, Chip, 1/16W, 1% 0603 Std Std R3 1 0 Resistor, Chip, 1/16W, 1% 0603 Std Std R4 1 100k Resistor, Chip, 1/16W, 1% 0603 Std Std R5 0 Open Resistor, Chip, 1/16W, 1% 0603 Std Std TP1, TP3, TP4, TP6, TP7, TP8, TP9 3 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x 0.100 inch 5000 Keystone TP2, TP5, TP9 3 5001 Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone U1 1 TPS54326PWP TPS54326PWP TI 929950-00 3M HPA540 Any 4.3 IC, 2-A Output Single Sync. Step-Down – 1 Shunt, 100-mil, Black – 1 PCB, 2.76 In x 1.97 In x 0.062 In 0.100 Reference 1. TPS54326 data sheet, Single Synchronous Converter with Integrated High Side and Low Side MOS FET (SLVSA14) SLVU353 – November 2009 Submit Documentation Feedback TPS54326EVM-540 3-A, SWIFTTM Regulator Evaluation Module Copyright © 2009, Texas Instruments Incorporated 13 Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EVM Warnings and Restrictions It is important to operate this EVM within the input voltage range of 5V to 17V and the output voltage range of 1V to 5V . Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 85°C. The EVM is designed to operate properly with certain components above 85°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. 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