SLVU445C March   2011  – August 2021 TPS56121

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Applications
    2. 2.2 Features
  4. 3 Electrical Performance Specifications
  5. 4 Schematic
  6. 5 Test Setup
    1. 5.1 Test Equipment
      1. 5.1.1 Voltage Source
      2. 5.1.2 Meters
      3. 5.1.3 Load
      4. 5.1.4 Oscilloscope
      5. 5.1.5 Fan
    2. 5.2 Recommended Wire Gauge
      1. 5.2.1 VIN to J1
      2. 5.2.2 J2 to LOAD
    3. 5.3 Equipment Set Up Procedure
  7. 6 Configurations
    1. 6.1 Enable Selection (J3)
  8. 7 Test Point Descriptions
    1. 7.1 Input Voltage Monitoring (TP1 and TP2)
    2. 7.2 Output Voltage Monitoring (TP3 and TP4)
    3. 7.3 Enable/Soft-start Monitoring (TP5)
    4. 7.4 Power Good Monitoring (TP6)
    5. 7.5 Loop Response Testing (TP7, TP8, TP9 and TP10)
    6. 7.6 Switch Node Voltage Monitoring (TP11 and TP12)
  9. 8 Test Procedures
    1. 8.1 Start Up/Shut Down Procedure
    2. 8.2 Output Ripple Voltage Measurement Procedure
    3. 8.3 Control Loop Gain and Phase Measurement Procedure
    4. 8.4 Equipment Shutdown
  10. 9 Performance Data and Typical Characteristic Curves
    1. 9.1  Efficiency
    2. 9.2  Load Regulation
    3. 9.3  Line Regulation
    4. 9.4  Output Voltage Ripple
    5. 9.5  Switch Node
    6. 9.6  Load Transient
    7. 9.7  Start Up
    8. 9.8  Power Off
    9. 9.9  Over-Current Protection
    10. 9.10 Control Loop Bode Plot
    11. 9.11 Thermal Image
  11. 10EVM Assembly Drawings and PCB Layout
  12. 11List of Materials
  13. 12Revision History

5.3 Equipment Set Up Procedure

Figure 5-1 is the recommended test setup to evaluate the TPS56121EVM-601.

GUID-2E52D729-9D76-4644-9572-31133FD51C84-low.gifFigure 5-1 TPS56121EVM-601 Recommended Test Setup
  1. Working at an ESD workstation, make sure that any wrist straps, bootstraps and mats are connected referencing the user to earth ground before power is applied to the EVM. Wearing electrostatic smock and safety glasses is also recommended.
  2. Prior to connecting the DC input source, VIN, it is advisable to limit the source current from VIN to 3.0 A maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 5-1.
  3. Connect VIN to J1 as shown in Figure 5-1.
  4. Connect ammeter A1 between VIN and J1 as shown in Figure 5-1.
  5. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 5-1.
  6. Connect voltmeter V2 to TP3 and TP4 as shown in Figure 5-1.
  7. Place the fan as shown in Figure 5-1 and turn it on, ensuring that the air blows directly across the evaluation module.