SLUU535A September   2011  – January 2022 TPS40400

 

  1. 1 Introduction
  2. 2 Description
    1. 2.1 Typical Applications
    2. 2.2 Features
  3. 3 Electrical Performance Specifications
  4. 4 Schematic
  5. 5 Test Setup
    1. 5.1 Test and Configuration Software
      1. 5.1.1 Description
      2. 5.1.2 Features
    2. 5.2 Test Equipment
      1. 5.2.1 Voltage Source
      2. 5.2.2 Multimeters
      3. 5.2.3 Output Load
      4. 5.2.4 Oscilloscope
      5. 5.2.5 Fan
      6. 5.2.6 Recommended Wire Gauge
    3. 5.3 Recommended Test Setup
    4. 5.4 USB Interface Adapter and Cable
      1. 5.4.1 Input Connections
      2. 5.4.2 Output Connections
      3. 5.4.3 Jumper Connections, JP1 and JP2
      4. 5.4.4 Jumper Configurations
  6. 6 EVM Configuration Using the Fusion GUI
    1. 6.1 Configuration Procedure
    2. 6.2 Fusion GUI Screenshots
  7. 7 Test Procedure
    1. 7.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 7.2 Control Loop Gain and Phase Measurement Procedure
    3. 7.3 List of Test Points
    4. 7.4 Equipment Shutdown
  8. 8 Performance Data and Typical Characteristic Curves
    1. 8.1  Efficiency
    2. 8.2  Load Regulation
    3. 8.3  Load Transients 1
    4. 8.4  Load Transient 2
    5. 8.5  Load Transient 3
    6. 8.6  Input and Output Ripple
    7. 8.7  Switch Node and HDRV
    8. 8.8  VIN Turn On
    9. 8.9  Enable ON / OFF
    10. 8.10 Turn ON with 92% (1.1V) Pre-bias
    11. 8.11 TPS40400EVM-351 Bode Plot (20-A output)
  9. 9 EVM Assembly Drawing and PCB Layout
  10. 10List of Materials
  11. 11Revision History

5.4.3 Jumper Connections, JP1 and JP2

For most tests it is recommended to install both jumpers, JP1 and JP2 on their respective headers. This will result in the remote sense points (the nodes at which the converter will regulate the output voltage) be located near the output connectors J3 and J4. This configuration is best for most functional testing.

These jumpers can be arranged differently depending on the desired location of remote sense.

Note:

The amount of voltage drop between the output connectors J3 and J4 and the remote sense points is limited by the power dissipation in the internal remote sense resistors R7 and R18 (see schematic, Figure 4-1).

These resistors are rated for 0.0625 W and are 49.9 Ω. This implies a remote sense voltage drop of no more than 1.7 V in each of the +VE and –VE sense lines. Since this EVM is configured as a 1.2-V output, this will likely not be the limiting factor, but caution is still advised because when remote sense is being utilized, the EVM will attempt to regulate out a lossy load wire installation.

Note:

The EVM may detect an Over-Voltage (OV) condition when remote sensing is being used, depending on the configurable OV setting. Refer to Section 5.2.6 for wire gauge recommendations.

When remote sense is not being utilized and the sense points are defaulted to the output connector of the EVM, the voltage drop in the load wires and the resulting reduced voltage applied to the electronic load may cause erratic behavior with the electronic load. This is because many loads will not function properly at input voltages lower than 1 V, which implies no more than 0.2-V drop combined in the load wires (+ and – load wires). Consult the documentation of the electronic load being used.