TPS54340-Q1EVM-593

User's Guide SLVU972 – September 2013 Evaluation Module for the TPS54340-Q1 Step-Down Converter This user's guide contains information for the TPS54340-Q1EVM-593 evaluation module (PWR593) including the performance specifications, schematic, and the bill of materials. spacer so the title "List of Tables" will print on page with the list. 1 2 3 4 Contents Introduction .................................................................................................................. 2 Test Setup and Results .................................................................................................... 5 Board Layout ............................................................................................................... 12 Bill of Materials ............................................................................................................. 15 List of Figures 1 TPS54340-Q1EVM-593 Board ............................................................................................ 2 2 TPS54340-Q1EVM-593 Schematic....................................................................................... 3 3 Efficiency versus Load Current............................................................................................ 5 4 Light Load Efficiency ....................................................................................................... Regulation versus Output Current ........................................................................................ Regulation versus Input Voltage .......................................................................................... Load Transient Response ................................................................................................. Loop Response ............................................................................................................. Line Transient Response .................................................................................................. Input Voltage Ripple CCM ................................................................................................. Input Voltage Ripple DCM ................................................................................................. Output Voltage Ripple CCM .............................................................................................. Output Voltage Ripple DCM .............................................................................................. Output Voltage Ripple Eco-mode ......................................................................................... Switching Waveform Without Snubber ................................................................................... Switching Waveform With Snubber ....................................................................................... Start Up With VIN Ramping Up .......................................................................................... Start Up Using EN ......................................................................................................... Prebias Start Up Using EN ............................................................................................... Shutdown With VIN Ramping Down ..................................................................................... Shutdown Using EN ....................................................................................................... Low Dropout Operation ................................................................................................... Low Dropout Start Up and Shutdown ................................................................................... TPS54340-Q1EVM-593 Top Assembly and Silkscreen .............................................................. TPS54340-Q1EVM-593 Layer 2 Layout ................................................................................ TPS54340-Q1EVM-593 Layer 3 Layout ................................................................................ TPS54340-Q1EVM-593 Bottom-Side Assembly and Silkscreen (Viewed From Top) ............................ 5 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 6 6 6 6 7 7 7 8 8 8 9 9 10 10 10 11 11 11 11 12 13 13 14 List of Tables Eco-mode is a trademark of Texas Instruments. SLVU972 – September 2013 Submit Documentation Feedback Evaluation Module for the TPS54340-Q1 Step-Down Converter Copyright © 2013, Texas Instruments Incorporated 1 Introduction 1 www.ti.com 1 Input Voltage and Output Current Summary ............................................................................ 2 TPS54340-Q1EVM-593 Performance Specification Summary ....................................................... 3 3 R5 Values for Common Output Voltages ................................................................................ 4 4 EVM Connectors and Test points ......................................................................................... 5 5 TPS54340-Q1EVM-593 Bill of Materials ............................................................................... 15 2 Introduction This user's guide contains background information for the TPS54340-Q1 as well as support documentation for the TPS54340-Q1EVM-593 evaluation module (PWR593). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54340-Q1EVM-593. Figure 1. TPS54340-Q1EVM-593 Board 1.1 Background The TPS54340-Q1 DC-DC converter is designed to provide up to a 3.5-A output from an input voltage source of 4.5 V to 42 V. Rated input voltage and output current range for the evaluation module are given in Table 1. This evaluation module is designed to demonstrate the small, printed-circuit-board (PCB) areas that may be achieved when designing with the TPS54340-Q1 regulator. The switching frequency is externally set at a nominal 400 kHz. This frequency was chosen to help with Electromagnetic Compatibility (EMC) by keeping the fundamental frequency out of the typical medium wave (MW) frequency range. The high-side MOSFET is incorporated inside the TPS54340-Q1 package along with the gate-drive circuitry. The compensation components are external to the integrated circuit (IC), and an external resistor divider allows for an adjustable output voltage. Additionally, the TPS54340-Q1 provides an adjustable undervoltage lockout with hysteresis through an external resistor divider. Lastly, the TPS54340-Q1EVM593 includes additional input filtering and a snubber to reduce emissions. The absolute maximum input voltage for the TPS54340-Q1EVM-593 is 42 V. Table 1. Input Voltage and Output Current Summary 1.2 EVM Input Voltage Range Output Current Range TPS54340-Q1EVM-593 VIN = 7.0 V to 42 V IOUT = 0 A to 3.5 A Performance Specification Summary A summary of the TPS54340-Q1EVM-593 (EVM) performance specifications is provided in Table 2. Specifications are given for an input voltage of VIN = 12 V and an output voltage of 5.0 V, unless otherwise specified. This EVM is designed and tested for VIN = 7.0 V to 42 V. The ambient temperature is 25°C for all measurements, unless otherwise noted. 2 Evaluation Module for the TPS54340-Q1 Step-Down Converter Copyright © 2013, Texas Instruments Incorporated SLVU972 – September 2013 Submit Documentation Feedback Introduction www.ti.com Table 2. TPS54340-Q1EVM-593 Performance Specification Summary Specification Test Conditions MIN TYP MAX 7 12 42 VIN voltage range Output voltage set point Unit V 5.0 Output current range VIN = 7 V to 42 V Line regulation IOUT = 3.5 A, VIN = 7 V to 42 V Load regulation VIN = 12 V, IOUT = 0.001 A to 3.5 A V 0 IOUT = 0.8 A to 2.6 A Load transient response IOUT = 2.6 A to 0.8 A Loop bandwidth VIN = 12 V, IOUT = 3.5 A Phase margin VIN = 12 V, IOUT = 3.5 A Input voltage ripple IOUT = 3.5 A, 20 MHz BWL Output voltage ripple IOUT = 3.5 A 3.5 A ±0.02% ±0.2% Voltage change 250 Recovery time 200 mV µs Voltage change 250 mV Recovery time 300 µs 13 kHz 75 °