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

4 Test Setup

Figure 4-1 shows the basic test setup to power up the TPS40071EVM−001.. The input power source should be capable of supplying the input current to the EVM operating in the intended conditions. This input current can be estimated by Equation 10, which allows for approximately 20% headroom over the actual input current requirement:

Equation 10. IIN= VOUT × IOUTVIN ×0.7

It is extremely important to monitor VIN and VOUT at the test jacks provided to perform accurate efficiency and regulation tests. Voltage drops through the connectors and input/output wiring can contribute significant errors in these measurements.

Some components are omitted for clarity. See Figure 6-1 for more detail.
Figure 4-1 TPS40071EVM-001 Test Setup