TPS57160-Q1EVM

User's Guide SLVUA80 – June 2014 TPS57160EVM User's Guide 1 Introduction 1.1 Background The TPS57160EVM evaluation module (EVM) is optimized to meet the Class 5 level of the CISPR25 EMC Standard for automotive components. See the emissions report, SLVA629. As listed in Table 1, the EVM requires an input voltage between 9 V and 16 V and provides an output voltage of 5 V at 1 A. The layout has been designed to reduce emissions to levels deemed acceptable by the aforementioned standard. The EVM features the TPS57160-Q1 step-down DC-DC converter which is a wide input voltage (3.5 V to 60 V) 1.5-A capable power device. Along with the EMC optimization, this evaluation module also demonstrates the small printed-circuit-board (PCB) areas that can be achieved when designing with the TPS57160-Q1 regulator. The switching frequency is externally set at a nominal 2 MHz. The compensation components are external to the integrated circuit (IC) and have been selected to optimize the transient performance of the device. An external divider allows for an adjustable output voltage. Additionally, the TPS57160-Q1 device provides adjustable slow start and undervoltage lockout through a resistor divider on the EN pin. Table 1. Input and Output Summary 1.2 EVM INPUT VOLTAGE RANGE OUTPUT RANGE TPS57160EVM VIN = 9 V to 16 V 5 V at currents up to 1 A Performance Specification Summary Table 2 lists a summary of the TPS57160EVM performance specifications. Specifications are given for an input voltage of VI = 12 V and an output voltage of VO = 5 V, unless otherwise specified. The TPS57160EVM is designed and tested for VI = 9 V to 16 V. The ambient temperature is 25°C for all measurements, unless otherwise noted. Table 2. TPS57160EVM Performance Specification Summary SPECIFICATION TEST CONDITION VIN operating voltage range MIN TYP MAX 9 12 16 UNIT V VIN start voltage 6.45 V VIN stop voltage 5.41 V 5 V Output voltage set point Output current range VI = 9 V to 16 V Output ripple voltage IO = 1 A Operating frequency SLVUA80 – June 2014 Submit Documentation Feedback 0 1 A 10 mVPP 2000 kHz TPS57160EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 1 Introduction 1.3 www.ti.com Modifications This evaluation module is designed to provide access to the features of the TPS57160-Q1 device. Some modifications can be made to the module. 1.3.1 Output Voltage Set Point The voltage dividers R7 and R8 are used to set the output voltage. To change the output voltage of the EVM, change the value of the resistor, R8. Changing the value of R8 can change the output voltage above Vsense which is 0.8 V. Use Equation 1 to calculate the value of R8 for a specific output voltage. R7 R8 = VO -1 V(VSENSE) (1) 1.3.2 Slow-Start Time The slow-start time can be adjusted by changing the value of C5. Use Equation 2 to calculate the required value of C5 for a desired slow-start time. T(SS) (ms) ´ I(SS) (µA) C5 = Vref (V) ´ 0.8 where • • I(SS) is 2 µA C5 is set to 0.015 µF on the EVM for a default slow-start time of 7.82 ms. (2) NOTE: The slow-start capacitor should remain lower than 0.47 µF and higher than 0.47 nF. 1.3.3 Adjustable Undervoltage Lockout The undervoltage lockout (UVLO) can be adjusted externally using R3 and R4. The EVM is set for a start voltage of 6.45 V and a stop voltage of 5.41 V using R3 = 348 kΩ and R4 = 78.7 kΩ. Use Equation 3 and Equation 4 along with notes included in the TPS57160-Q1 datasheet (SLVSAP1) to calculate required resistor values for different start and stop voltages. V(start) - V(stop) R3 = 2.9 ´ 10-6 A (3) 1.25 V R4 = V(start) - V(stop) + 0.9 ´ 10-6 A R3 (4) 2 TPS57160EVM User's Guide SLVUA80 – June 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Test Setup and Results www.ti.com 2 Test Setup and Results This section describes how to properly connect, set up, and use the TPS57160EVM evaluation module. The section also includes the measured output voltage ripple of the EVM. 2.1 Input/Output Connections The TPS57160EVM is provided with input connectors, output connectors, and test points as shown in Table 3. A power supply capable of supplying 1 A must be connected to J1 through a pair of 20 AWG (0.52 mm2 ) or larger wires. The load must be connected to J2 through a pair of 20 AWG (0.52 mm2 ) or larger wires. The maximum load-current capability must be at least 1 A to use the full capability of this EVM. Wire lengths must be minimized to reduce losses in the wires. Table 3. EVM Connectors and Test Points Reference Designator Function J1 VI (see Table 1 for VI range) J2 VO, 5 V at 1 A maximum TP1 TP2 TP3 GND Test Points TP4 2.2 Output Voltage Ripple Figure 1 shows the TPS57160EVM output voltage ripple. The output current is the rated full load current of 1 A and VI = 12 V. The ripple voltage is measured directly across the output capacitor. Figure 1. TPS57160EVM Output Ripple SLVUA80 – June 2014 Submit Documentation Feedback TPS57160EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 3 Board Layout 3 www.ti.com Board Layout This section provides a description of the TPS57160EVM board layout and includes the layer figures. 3.1 Layout Figure 2, Figure 3, Figure 4, Figure 5, Figure 5, and Figure 7 show the board layout for the TPS57160EVM. 4 Figure 2. Top Layer Figure 3. Inner Layer 1 Figure 4. Inner Layer 2 Figure 5. Bottom Layer Figure 6. Top Overlay Figure 7. Bottom Overlay TPS57160EVM User's Guide SLVUA80 – June 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Schematic and Bill of Materials www.ti.com 4 Schematic and Bill of Materials 4.1 Schematic Figure 8 shows the schematic of the TPS57160EVM. VIN_BUCK L1 1.5µH VOUT PH1 U1 TPS54160DGQ 2 1 C1 4.7uF C4 4.7uF R3 348k 2 EN 3 J1 4 EN 9 to 16 Volts R4 78.7k C2 220uF PH EN BOOT VSENSE SS/TR PWRGD 5 + VIN RT/CLK 8 COMP TP GND 5V, 1A L2 10 R1 1 7 FB 0 J2 C6 .1uF 6 R7 10.0k 11 9 D1 MBRA140LT3 C12 1.5nF R6 20.5k R5 53.6k R9 10.0k R2 10 C3 4.7uF C5 .015uF 1 2 4.7µH C9 10uF FB R8 1.87k C8 39pF C7 1200pF GND 2MHz VIN_BUCK TP1 C10 .015uF TP2 TP3 TP4 C11 .015uF GND GND Figure 8. TPS57160EVM Schematic SLVUA80 – June 2014 Submit Documentation Feedback TPS57160EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 5 Schematic and Bill of Materials 4.2 www.ti.com Bill of Materials Table 4 lists the bill of materials for the TPS57160EVM Table 4. TPS57160EVM Bill of Materials DESIGNATOR QTY. PCB 1 VALUE DESCRIPTION PACKAGE REFERENCE Printed Circuit Board PART NUMBER MANUFACTURER HVL080 Any C1 C3 3 4.7 µF Capacitor, ceramic, 25-V, X7R, 10% 1206 C3216X7R1E475K TDK 1 220 µF Capacitor, aluminum, electrolytic, 25-V, 20% 0.315 inch 25ZL220M8X11.5 Rubycon 3 .015 µF Capacitor, ceramic, 50-V, X7R, 10% 0603 C1608X7R1H153K TDK C6 1 0.1 µF Capacitor, ceramic, 50-V, X7R, 10% 0603 C1608X7R1H104K TDK C7 1 1200 pF Capacitor, ceramic, 50-V, C0G, 5% 0603 C1608COG1H122J TDK C8 1 39 pF Capacitor, ceramic, 50-V, C0G, 5% 0603 C1608COG1H390J TDK C9 1 10 µF Capacitor, ceramic, 16-V, X7R, 10% 1206 C3216X7R1C106K TDK C12 1 1.5 nF Capacitor, ceramic, 50-V, X7R, 10% 0603 C1608X7R1H153K TDK D1 1 MBRA140LT3 Diode, Schottky, 1-A, 40-V SMA MBRA130LT3 Motorola 6 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A 2 Terminal block, 6-A, 3.5-mm pitch, 2-Pos, TH 7.0 × 8.2 × 6.5mm ED555/2DS On-Shore Technology C4 C2 C5, C10 C11 FID1 FID2 FID3 FID4 FID5 FID6 J1 J2 L1 1 1.5 µH Inductor, SMT, 9-A, 15-mΩ IHLP-2525CZ IHLP2525CZER1R5M01 Vishay-Dale L2 1 4.7 µH Inductor, SMT, 4.5-A, 40-mΩ IHLP-2525CZ IHLP2525CZER4R7M01 Vishay-Dale Thermal Transfer Printable Labels, 0.650" W x 0.200" H - 10,000 per roll PCB Label 0.650"H × 0.200"W THT-14-423-10 Brady LBL1 1 R1 1 0 RES, 0 -Ω, 5%, 0.063-W, 0402 0402 RC0402JR-070RL Yageo America R2 1 10 RES, 10 -Ω, 5%, 0.1-W, 0603 0603 CRCW060310R0JNEA Vishay-Dale R3 1 348 kΩ RES, 348-kΩ, 1%, 0.1-W, 0603 0603 CRCW0603348KFKEA Vishay-Dale R4 1 78.7 kΩ RES, 78.7-kΩ, 1%, 0.1-W, 0603 0603 CRCW060378K7FKEA Vishay-Dale R5 1 53.6 kΩ RES, 53.6-kΩ, 1%, 0.1-W, 0603 0603 CRCW060353K6FKEA Vishay-Dale 6 TPS57160EVM User's Guide SLVUA80 – June 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Schematic and Bill of Materials www.ti.com Table 4. TPS57160EVM Bill of Materials (continued) DESIGNATOR QTY. VALUE DESCRIPTION PACKAGE REFERENCE PART NUMBER MANUFACTURER R6 1 20.5 kΩ RES, 20.5-kΩ, 1%, 0.1-W, 0603 0603 CRCW060320K5FKEA Vishay-Dale 2 10 kΩ RES, 10-kΩ, 1%, 0.1-W, 0603 0603 CRCW060310K0FKEA Vishay-Dale 1 1.87 kΩ RES, 1.87-kΩ, 1%, 0.1-W, 0603 0603 CRCW06031K87FKEA Vishay-Dale 4 5001 Test Point, Black, Thru Hole, Color Keyed 0.100 × 0.100 inch 5001 Keystone 1 TPS57160QDG Q IC, DC-DC Converter, 60-V, 1.5-A DGQ0010D TPS57160QDGQ Texas Instruments R7 R9 R8 TP1 TP2 TP3 TP4 U1 SLVUA80 – June 2014 Submit Documentation Feedback TPS57160EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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