SLUU180B January   2022  – February 2022 TPS40070 , TPS40071

 

  1.   Trademarks
  2. 1Introduction
  3. 2Description
  4. 3Schematic
    1. 3.1 Output Filter Components
    2. 3.2 MOSFET Selection
    3. 3.3 Frequency Feedforward Resistor Selection
    4. 3.4 Output Voltage Setpoint
    5. 3.5 Short Circuit Protection Resistor Selection
    6. 3.6 Miscellaneous Parts
    7. 3.7 Control Loop Compensation
  5. 4Test Setup
  6. 5Results
    1. 5.1 Control Loop Characteristics
  7. 6Assembly Drawing and PCB Layout
  8. 7List of Materials
  9. 8Reference
  10. 9Revision History

3 Schematic

Figure 3-1 shows the TPS40071EVM−001 schematic. The switching frequency is chosen to be 300 kHz to enable the converter to operate efficiently over a wide range of input and output conditions. C1 is included on the board to represent the output capacitance of the upstream converter feeding the EVM, and no external capacitance should be required at the input. In typical applications with short input wiring (less than 1 inch to 3 inch depending on output power level), C1 might not be required. C12 and C14 are local high frequency bypass capacitors for the power circuitry.

Figure 3-1 TPS40071EVM−001 Schematic