User's Guide SLVU659A – March 2012 – Revised March 2012 TPS62125EVM-044 Evaluation Module This user’s guide describes the characteristics, operation, and use of the Texas Instruments TPS62125 evaluation module (EVM). This EVM is designed to help the user easily evaluate and test the operation and functionality of the TPS62125. The EVM converts a 4-V to 17-V input voltage to a regulated 3.3-V output voltage that delivers 300 mA. This user’s guide includes setup instructions for the hardware, printed-circuit board layouts for the EVM, a schematic diagram, a bill of materials, and test results for the EVM. 1 2 3 4 5 Contents Introduction .................................................................................................................. 2 Setup ......................................................................................................................... 2 TPS62125EVM-044 Test Results ......................................................................................... 3 Board Layout ................................................................................................................ 9 Schematic and Bill of Materials .......................................................................................... 11 List of Figures .................................. 1 Efficiency (R1, R2, and R3 not installed. JP1 connected between ON and EN.) 2 Load Regulation ............................................................................................................. 4 3 Line Regulation With Iout = 250 mA...................................................................................... 4 4 Loop Response With Vin = 12 V and Iout = 250 mA ................................................................... 4 5 Input Voltage Ripple With Vin = 12 V and Iout = 250 mA ............................................................. 5 6 Output Voltage Ripple With Vin = 12 V and Iout = 250 mA ........................................................... 5 7 Load Transient Response With Vin = 12 V .............................................................................. 6 8 Start-Up on Vin With 250-mA Load ....................................................................................... 6 9 Start-Up on EN With 250-mA Load ....................................................................................... 7 10 Shutdown on EN With 250-mA Load ..................................................................................... 7 11 Prebias Start-Up and Shutdown on EN With 250-mA Load ........................................................... 8 12 Thermal Performance With Vin = 12 V and Iout = 250 mA 13 14 15 16 17 3 ........................................................... 8 Top Silk Layer ............................................................................................................... 9 Top Layer .................................................................................................................... 9 Bottom Layer ............................................................................................................... 10 Top Assembly Layer ...................................................................................................... 10 TPS62125EVM-044 Schematic.......................................................................................... 11 List of Tables 1 Performance Specification Summary..................................................................................... 2 2 TPS62125EVM-044 Bill of Materials .................................................................................... 12 SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback TPS62125EVM-044 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 1 Introduction 1 www.ti.com Introduction The TPS62125 is a 300-mA, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package. 1.1 Background The TPS62125EVM-044 (PWR044) uses the TPS62125 device and is set to a 3.3-V output. The EVM operates with full-rated performance with an input voltage between 4 V and 17 V, assuming JP1 is connected between ON and EN. The TPS62125 device contains an adjustable enable threshold and adjustable hysteresis feature. Thus, the input voltage at which the device enables and disables is fully programmable by the user. In the TPS62125EVM-044, the device is set to turn on at 6 V and turn off at 4 V. This feature can be bypassed by using jumper JP1, which overrides the programmed threshold voltages. 1.2 Performance Specification Table 1 provides a summary of the TPS62125EVM-044 performance specifications. All specifications are given for an ambient temperature of 25°C. Table 1. Performance Specification Summary Specification Test Conditions Input voltage JP1 connected between EN and ON Output voltage PWM Mode of Operation Output current 1.3 Typ 4 Max 17 3.3 0 Peak efficiency Soft-start time Min Unit V V 300 mA 93.3% Ramp time of the output voltage 330 µs Modifications The printed-circuit board (PCB) for this EVM accommodates additional input and output capacitors, as well as a feedforward capacitor. 1.3.1 Input and Output Capacitors C3 is provided for an additional input capacitor. This capacitor is not required for proper operation but can be used to reduce the input voltage ripple. C4 is provided for an additional output capacitor. This capacitor is not required for proper operation but can be used to reduce the output voltage ripple and to improve the load transient response. The total output capacitance must remain within the recommended range in the data sheet for proper operation. 1.3.2 Feedforward Capacitor C6 is provided for a feedforward capacitor. This capacitor is not required for proper operation but can be used to improve the transient response. Typically, using a 22-pF feedforward capacitor reduces or eliminates any output voltage overshoot that may occur at start-up. C6 is located on the back side of the PCB. 2 Setup This section describes how to properly use the TPS62125EVM-044. 2.1 Input/Output Connector Descriptions 2 TPS62125EVM-044 Evaluation Module SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated TPS62125EVM-044 Test Results www.ti.com J1 – VIN J2 – S+/SJ3 – GND J4 – VOUT J5 – S+/SJ6 – GND J7 – PG/GND JP1 – EN JP2 – PG Pullup Voltage 2.2 Positive input connection from the input supply for the EVM. Input voltage sense connections. Measure the input voltage at this point. Return connection from the input supply for the EVM. Output voltage connection. Output voltage sense connections. Measure the output voltage at this point. Output return connection. The PG output appears on pin 1 of this header with a convenient ground on pin 2. EN pin input jumper. Place the supplied jumper across ON and EN to turn on the IC. Place the jumper across OFF and EN to turn off the IC. Do not install the supplied jumper to utilize the adjustable enable threshold voltage feature of the IC. PG pin pullup voltage jumper. Place the supplied jumper on JP2 to connect the PG pin pullup resistor to Vout. Alternatively, the jumper can be removed and a different voltage can be supplied on pin 1 to pull up the PG pin to a different level. This externally applied voltage must remain below 12 V. Setup To operate the EVM, set jumpers JP1 through JP2 to the desired positions per Section 2.1. Connect the input supply to J1 and J3 and connect the load to J4 and J6. 3 TPS62125EVM-044 Test Results This section provides test results of the TPS62125EVM-044. 100 90 VIN = 5 V 80 Efficiency (%) 70 VIN = 17 V 60 50 VIN = 12 V 40 30 20 10 0 0.01 0.1 1 10 Load Current (mA) 100 1000 Figure 1. Efficiency (R1, R2, and R3 not installed. JP1 connected between ON and EN.) SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback TPS62125EVM-044 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 3 TPS62125EVM-044 Test Results www.ti.com 1.4 VIN = 17 V 1.2 Load Regulation (%) 1 0.8 VIN = 12 V 0.6 VIN = 5 V 0.4 0.2 0 0.01 0.1 1 10 Load Current (mA) 100 1000 Figure 2. Load Regulation 1 0.8 Line Regulation (%) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 4 5 6 7 8 9 10 11 12 13 VI - Input Voltage - (V) 14 15 16 17 Figure 3. Line Regulation With Iout = 250 mA 180 Phase Gain - dB 50 150 40 120 30 90 20 60 30 10 Gain 0 0 Phase - deg 60 -10 30 -20 -60 -30 -90 -40 -120 -50 -150 -60 100 1k 10k Frequency - Hz 100k -180 1M Figure 4. Loop Response With Vin = 12 V and Iout = 250 mA 4 TPS62125EVM-044 Evaluation Module SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated TPS62125EVM-044 Test Results www.ti.com SW 5 V/div lind 200 mA/div Vin (AC Coupled) 20 mV/div t - Time - 500 ns/div Figure 5. Input Voltage Ripple With Vin = 12 V and Iout = 250 mA SW 5 V/div lind 200 mA/div Vout (AC Coupled) 20 mV/div t - Time - 500 ns/div Figure 6. Output Voltage Ripple With Vin = 12 V and Iout = 250 mA SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback TPS62125EVM-044 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 5 TPS62125EVM-044 Test Results www.ti.com Vout (AC Coupled) 20 mV/div Iout 100 mA/div (150 mA to 250 mA Load Step) t - Time - 5 ms/div Figure 7. Load Transient Response With Vin = 12 V Vin 5 V/div EN 2 V/div Vout 1 V/div PG 2 V/div t - Time - 100 ms/div Figure 8. Start-Up on Vin With 250-mA Load 6 TPS62125EVM-044 Evaluation Module SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated TPS62125EVM-044 Test Results www.ti.com Vin 5 V/div EN 2 V/div Vout 1 V/div PG 2 V/div t - Time - 100 ms/div Figure 9. Start-Up on EN With 250-mA Load Vin 5 V/div EN 2 V/div Vout 1 V/div PG 2 V/div t - Time - 100 ms/div Figure 10. Shutdown on EN With 250-mA Load SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback TPS62125EVM-044 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 7 TPS62125EVM-044 Test Results www.ti.com Vin 5 V/div EN 2 V/div 1.5 V pre-bias Vout 1 V/div PG 2 V/div t - Time - 200 ms/div Figure 11. Prebias Start-Up and Shutdown on EN With 250-mA Load Figure 12. Thermal Performance With Vin = 12 V and Iout = 250 mA 8 TPS62125EVM-044 Evaluation Module SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Board Layout www.ti.com 4 Board Layout This section provides the TPS62125EVM-044 board layout and illustrations. Figure 13. Top Silk Layer Figure 14. Top Layer SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback TPS62125EVM-044 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 9 Board Layout www.ti.com Figure 15. Bottom Layer Figure 16. Top Assembly Layer 10 TPS62125EVM-044 Evaluation Module SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Schematic and Bill of Materials www.ti.com 5 Schematic and Bill of Materials This section provides the TPS62125EVM-044 schematic and bill of materials. 2 1 J6 S+ S- 2 1 R6 100k VOS 6 1 GND PG 8 ETPAD 9 Not Installed R3 274k R2 442k 1 3 1 JP1 2 1 GND J3 2 1 S+ S- J2 2 VIN 4V - 17V J1 1 ON EN OFF VIN 2 + VIN C5 22uF C3 1 10uF C1 R1 1.80M 2 VIN 3 EN 4 EN_HYS SW 7 FB 5 TP1 U1 TPS62125DSG 1 L1 15uH R5 576k R4 1.80M 1 C6 JP2 1 2 J7 10uF PG GND 1 2 J5 1 C2 C4 2 J4 1 GND Schematic VOUT 3.3V 300 mA max 5.1 Figure 17. TPS62125EVM-044 Schematic SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback TPS62125EVM-044 Evaluation Module Copyright © 2012, Texas Instruments Incorporated 11 Schematic and Bill of Materials 5.2 www.ti.com Bill of Materials Table 2. TPS62125EVM-044 Bill of Materials Count RefDes Value Description Size Part Number MFR 1 C1 10 µF Capacitor, Ceramic, 25V, X5R, ±20% 0805 Std Std 1 C2 10 µF Capacitor, Ceramic, 16V, X5R, ±20% 0805 Std Std 1 C5 22 µF Capacitor, POSCAP, 20V, ±20% 3528[B] 20TQC22MYFB Sanyo 1 L1 15 µH Inductor, Power, 0.56 A, 275-mΩ, ±20% 3 X 2.5 mm VLF302515MT-150M TDK 2 R1, R4 1.8M Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R2 442k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R3 274k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R5 576k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R6 100k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 U1 TPS62125 IC, 3V-17V, 300mA Buck Converter with Adjustable Enable Threshold and Hysteresis WSON-8 TPS62125DSG TI The TPS62125EVM-044 may be populated with TPS62125 (U1) devices that do not contain the correct top side markings on the top of the device itself. These devices are still fully tested TPS62125 devices and meet the specified electrical characteristics in the datasheet. 12 TPS62125EVM-044 Evaluation Module SLVU659A – March 2012 – Revised March 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: 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. 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 LIMITED 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. 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. 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 visit www.ti.com/esh or contact TI. 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. 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. REGULATORY COMPLIANCE INFORMATION As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal Communications Commission (FCC) and Industry Canada (IC) rules. For EVMs not subject to the above rules, this evaluation board/kit/module 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 or ICES-003 rules, which are designed to provide reasonable protection against radio frequency interference. Operation of the equipment 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. General Statement for EVMs including a radio User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization. For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant Caution This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC Interference Statement for Class A EVM devices This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. For EVMs annotated as IC – INDUSTRY CANADA Compliant This Class A or B digital apparatus complies with Canadian ICES-003. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Concerning EVMs including radio transmitters This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Concerning EVMs including detachable antennas Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada. Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de l'utilisateur pour actionner l'équipement. Concernant les EVMs avec appareils radio Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur. SPACER SPACER SPACER SPACER SPACER SPACER SPACER SPACER 【Important Notice for Users of this Product in Japan】 】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of Japan, Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product, or Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan. 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It is intended solely for use for preliminary feasibility evaluation in laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end product. Your Sole Responsibility and Risk. You acknowledge, represent and agree that: 1. 2. 3. 4. You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees, affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes. You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates, contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard. You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even if the EVM should fail to perform as described or expected. You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials. Certain Instructions. It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or interface electronics. 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 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in development environments should use these EVMs. Agreement to Defend, Indemnify and Hold Harmless. You agree to defend, indemnify and hold TI, its licensors and their representatives harmless from and against any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims") arising out of or in connection with any use of the EVM that is not in accordance with the terms of the agreement. This obligation shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if the EVM fails to perform as described or expected. Safety-Critical or Life-Critical Applications. If you intend to evaluate the components for possible use in safety critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, such as devices which are classified as FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement. 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