SLVU097B October   2003  – October 2021 TPS54350

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Setpoint
      2. 1.3.2 Switching Frequency
      3. 1.3.3 Input Filter
      4. 1.3.4 UVLO Programming
      5. 1.3.5 Synchronization
      6. 1.3.6 Power Good
      7. 1.3.7 Synchronous Low-Side FET
      8. 1.3.8 Optional Output Filtering
  3. 2Test Setup and Results
    1. 2.1  Input/Output Connections
    2. 2.2  Efficiency
    3. 2.3  Power Dissipation
    4. 2.4  Output Voltage Regulation
    5. 2.5  Load Transients
    6. 2.6  Loop Characteristic
    7. 2.7  Output Voltage Ripple
    8. 2.8  Input Voltage Ripple
    9. 2.9  Gate Drive
    10. 2.10 Powering Up and Down
  4. 3Board Layout
    1. 3.1 Layout
  5. 4Schematic and Bill of Materials
    1. 4.1 Bill of Materials
  6. 5Revision History

1.1 Background

The TPS54350 DC/DC converter is designed to provide up to 3-A output from a nominal 12-V (6-V to 18-V) input voltage source. Table 1-1 provides the rated input voltage and output current range. This evaluation module is designed to demonstrate the small PCB areas that can be achieved when designing with the TPS54350 regulator and does not reflect the high efficiencies that can be achieved when designing with this part. The switching frequency is set at a nominal 500 kHz, allowing the use of a relatively small footprint 10-mH output inductor. The high-side MOSFET is incorporated inside the TPS54350 package along with gate drive circuitry for an external synchronous FET. The low drain-to-source on resistance of the MOSFET allows the TPS54350 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The compensation components are provided external to the IC, and allow for an adjustable output voltage and a customizable loop response. The TPS54350 is a full-featured device including:

  • Programmable undervoltage lockout
  • Bidirectional synchronization
  • Adjustable switching frequency
  • Enable and power good functions
Table 1-1 Input Voltage and Current Summary
EVM INPUT VOLTAGE RANGE(1) OUTPUT CURRENT RANGE
TPS54350EVM−235 6 V to 18 V 0 A to 3 A
(1) Operation assured to 4.0 V after initial start-up.