User's Guide SLVU483 – October 2011 TPS62160EVM-627 and TPS62170EVM-627 Evaluation Modules This user’s guide describes the characteristics, operation, and use of the Texas Instruments TPS62160 and TPS62170 evaluation modules (EVM). These EVMs are designed to help the user easily evaluate and test the operation and functionality of the TPS62160 and TPS62170. This user’s guide includes setup instructions for the hardware, printed-circuit board layouts for the EVMs, a schematic diagram, a bill of materials, and test results for the EVMs. 1 2 3 4 5 Contents Introduction .................................................................................................................. 2 Setup ......................................................................................................................... 3 TPS621x0EVM-627 Test Results ......................................................................................... 3 Board Layout ............................................................................................................... 10 Schematic and Bill of Materials .......................................................................................... 12 List of Figures 1 Loop Response Measurement Modification ............................................................................. 3 2 Efficiency ..................................................................................................................... 4 3 Load Regulation ............................................................................................................. 4 4 Line Regulation With Iout = 0.5 A......................................................................................... 4 5 Loop Response With Vin = 12 V and Iout = 0.5 A ...................................................................... 5 6 Input Voltage Ripple With Vin = 12 V and Iout = 1 A 7 Output Voltage Ripple With Vin = 12 V and Iout = 1 A ................................................................ 6 8 Load Transient Response With Vin = 12 V .............................................................................. 6 9 Start-Up on Vin With 0.5-A Load .......................................................................................... 7 10 Start-Up on EN with 0.5-A Load 11 12 13 14 15 16 17 .................................................................. 5 .......................................................................................... 7 Shutdown on EN With 0.5-A Load ........................................................................................ 8 Prebias Start-Up and Shutdown on EN With 0.5-A Load .............................................................. 8 Thermal Performance With Vin = 12 V and Iout = 1 A ................................................................. 9 Assembly Layer ............................................................................................................ 10 Top Layer Routing ......................................................................................................... 10 Bottom Layer Routing ..................................................................................................... 11 TPS621x0EVM-627 Schematic .......................................................................................... 12 List of Tables 1 Performance Specification Summary..................................................................................... 2 2 TPS621x0EVM-627 Bill of Materials .................................................................................... 13 SLVU483 – October 2011 Submit Documentation Feedback TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated 1 Introduction 1 www.ti.com Introduction The TPS62160 is a 1-A, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package. Both fixed and adjustable output voltage units are available. The TPS62170 is a 0.5-A, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package. Both fixed and adjustable output voltage units are available. 1.1 Background The TPS62160EVM-627 (HPA627-001) uses the TPS62160 adjustable version and is set to a 3.3-V output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V. The TPS62170EVM-627 (HPA627-002) uses the TPS62170 adjustable version and is set to a 3.3-V output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V. 1.2 Performance Specification Table 1 provides a summary of the TPS621x0EVM-627 performance specifications. All specifications are given for an ambient temperature of 25°C. Table 1. Performance Specification Summary Specification Test Conditions Input Voltage 1.3 Min Typ Max 3.327 3.427 V 1000 mA 500 mA 3.7 Output Voltage PWM Mode of Operation 3.227 Output Current TPS62160EVM-627 0 TPS62170EVM-627 0 17 Peak Efficiency 93.1 % Soft-Start Time 180 Unit V µs Modifications The printed-circuit board (PCB) for this EVM is designed to accommodate both the fixed and adjustable voltage versions of this integrated circuit (IC). Additional input and output capacitors can also be added. Finally, the loop response of the IC can be measured. 1.3.1 Fixed Output Operation U1 can be replaced with the fixed-voltage version of the IC for evaluation. For fixed-voltage version operation, replace R2 with a 0-Ω resistor and remove R1. 1.3.2 Input and Output Capacitors C4 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. C3 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. 1.3.3 Loop Response Measurement The loop response of the TPS621x0EVM-627 can be measured with two simple changes to the circuitry. First, install a 10-Ω resistor across the pads in the middle of the back of the PCB. The pads are spaced to allow installation of 0805- or 0603-sized resistors. Second, cut the short section of trace between the via on the output voltage and the trace that connects to the VOS pin via. These changes are shown in Figure 1. With these changes, an ac signal (10-mV, peak-to-peak amplitude recommended) can be injected into the control loop across the added resistor. 2 TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated SLVU483 – October 2011 Submit Documentation Feedback Setup www.ti.com Added Resistor Cut This Trace Figure 1. Loop Response Measurement Modification 2 Setup This section describes how to properly use the TPS621x0EVM-627. 2.1 Input/Output Connector Descriptions J1 – VIN J2 – S+/SJ3 – GND J4 – VOUT J5 – S+/SJ6 – GND J7 – PG/GND 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. JP1 – EN 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. 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 7 V. JP2 – PG Pullup Voltage 2.2 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 TPS621x0EVM-627 Test Results This section provides test results of the TPS621x0EVM-627. SLVU483 – October 2011 Submit Documentation Feedback TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated 3 TPS621x0EVM-627 Test Results www.ti.com 100 95 VIN = 5 V 90 VIN = 9 V 85 Efficiency (%) 80 75 VIN = 12 V 70 VIN = 15 V VIN = 17 V 65 60 55 50 45 40 0.1 1 10 100 1000 Current (mA) Figure 2. Efficiency 0.5 VIN = 15 V 0.4 VIN = 17 V Load Regulation (%) 0.3 VIN = 12 V 0.2 0.1 VIN = 9 V 0 VIN = 5 V -0.1 -0.2 0.1 1 10 Current (mA) 100 1000 Figure 3. Load Regulation 0.15 Line Regulation (%) 0.1 0.05 0 -0.05 -0.1 3 5 7 9 11 VI - Input Voltage - (V) 13 15 17 Figure 4. Line Regulation With Iout = 0.5 A 4 TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated SLVU483 – October 2011 Submit Documentation Feedback TPS621x0EVM-627 Test Results www.ti.com 60 180 Gain - dB 150 40 120 30 90 20 60 10 30 Gain 0 0 -10 -30 -20 -60 -30 -90 -40 -120 -50 Phase - deg. Phase 50 -150 -60 1k 10k 100k -180 1M f - Frequency - Hz Figure 5. Loop Response With Vin = 12 V and Iout = 0.5 A Vin (AC Coupled) 20 mV/div Iind 500 mA/div SW 10 V/div t - Time - 200 ns/div Figure 6. Input Voltage Ripple With Vin = 12 V and Iout = 1 A SLVU483 – October 2011 Submit Documentation Feedback TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated 5 TPS621x0EVM-627 Test Results www.ti.com Vout (AC Coupled) 10 mV/div Iind 500 mA/div SW 10 V/div t - Time - 500 ns/div Figure 7. Output Voltage Ripple With Vin = 12 V and Iout = 1 A Vout (AC Coupled) 20 mV/div Iout 500 mA/div 500 mA to 750 mA Load step t - Time - 2 ms/div Figure 8. Load Transient Response With Vin = 12 V 6 TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated SLVU483 – October 2011 Submit Documentation Feedback TPS621x0EVM-627 Test Results www.ti.com Vin 5 V/div EN 5 V/div PG 2 V/div Vout 1 V/div t - Time - 50 ms/div Figure 9. Start-Up on Vin With 0.5-A Load Vin 10 V/div EN 10 V/div PG 2 V/div Vout 1 V/div t - Time - 50 ms/div Figure 10. Start-Up on EN with 0.5-A Load SLVU483 – October 2011 Submit Documentation Feedback TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated 7 TPS621x0EVM-627 Test Results www.ti.com Vin 10 V/div EN 10 V/div PG 2 V/div Vout 1 V/div t - Time - 200 ms/div Figure 11. Shutdown on EN With 0.5-A Load Vin 10 V/div EN 2 V/div PG 2 V/div Vout 1 V/div 1.5 V Pre-bias t - Time - 100 ms/div Figure 12. Prebias Start-Up and Shutdown on EN With 0.5-A Load 8 TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated SLVU483 – October 2011 Submit Documentation Feedback TPS621x0EVM-627 Test Results www.ti.com Figure 13. Thermal Performance With Vin = 12 V and Iout = 1 A SLVU483 – October 2011 Submit Documentation Feedback TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated 9 Board Layout 4 www.ti.com Board Layout This section provides the TPS621x0EVM-627 board layout and illustrations. Figure 14. Assembly Layer Figure 15. Top Layer Routing 10 TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated SLVU483 – October 2011 Submit Documentation Feedback Board Layout www.ti.com Figure 16. Bottom Layer Routing SLVU483 – October 2011 Submit Documentation Feedback TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated 11 Schematic and Bill of Materials 5 www.ti.com Schematic and Bill of Materials This section provides the TPS621x0EVM-627 schematic and bill of materials. Schematic + 5.1 Figure 17. TPS621x0EVM-627 Schematic 12 TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, Texas Instruments Incorporated SLVU483 – October 2011 Submit Documentation Feedback Schematic and Bill of Materials www.ti.com 5.2 Bill of Materials Table 2. TPS621x0EVM-627 Bill of Materials Count -001 -002 RefDes Value Description Size Part Number MFR 1 1 C1 10 µF Capacitor, Ceramic, 25V, X5R, 20% 0805 Std Std 1 1 C2 22 µF Capacitor, Ceramic, 6.3V, X5R, 20% 0805 Std Std 1 1 C5 68 µF Capacitor, Tantalum, 35V, 68uF, ±20% 7361[V] TPSV686M035R0150 AVX 1 1 L1 2.2 µH Inductor, SMT, 2.2 uH, 1.4A, 60-milliohm 2.80 X 3.00 mm VLF3012ST-2R2M1R4 TDK 1 1 R1 1.21M Resistor, Chip, 1/16W, 1% 0603 Std Std 1 1 R2 383k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 1 R3 100k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 0 U1 TPS62160DSG IC, 17V 1A Buck Converter 2 x 2 mm WSON TPS62160DSG TI 0 1 U1 TPS62170DSG IC, 17V 0.5A Buck Converter 2 x 2 mm WSON TPS62170DSG TI SLVU483 – October 2011 Submit Documentation Feedback TPS62160EVM-627 and TPS62170EVM-627— Evaluation Modules Copyright © 2011, 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. 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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 3.6 V to 17 V and the output voltage range of 0.9 V to 6 V. 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 50°C. The EVM is designed to operate properly with certain components above 50°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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