SLUUCO2 August   2022 TPSM8D6B24

 

  1.   Abstract
  2.   Trademarks
  3. 1 Description
    1. 1.1 Before You Begin
    2. 1.2 Features
  4. 2 Electrical Performance Specifications
  5. 3 Schematic
  6. 4 Test Setup
    1. 4.1 Test and Configuration Software
      1. 4.1.1 Description
      2. 4.1.2 Features
    2. 4.2 Test Equipment
      1. 4.2.1 Voltage Source
      2. 4.2.2 Oscilloscope
      3. 4.2.3 Multimeters
      4. 4.2.4 Output Load
      5. 4.2.5 Fan
      6. 4.2.6 USB-to-GPIO Interface Adapter
      7. 4.2.7 Recommended Wire Gauge
    3. 4.3 List of Test Points, Jumpers, and Connectors
    4. 4.4 Evaluating Split Rail Input
  7. 5 EVM Configuration Using the Fusion GUI
    1. 5.1 Configuration Procedure
  8. 6 Test Procedure
    1. 6.1 Line and Load Regulation and Efficiency Measurement Procedure
    2. 6.2 Efficiency Measurement Test Points
    3. 6.3 Control Loop Gain and Phase Measurement Procedure
  9. 7 Performance Data and Typical Characteristic Curves
    1. 7.1 Efficiency
    2. 7.2 Load Regulation
    3. 7.3 Line Regulation
    4. 7.4 Transient Response
    5. 7.5 Control Loop Bode Plot
    6. 7.6 Output Ripple
    7. 7.7 Control On
    8. 7.8 Control Off
    9. 7.9 Thermal Image
  10. 8 EVM Assembly Drawing and PCB Layout
  11. 9 Bill of Materials
  12. 10Using the Fusion GUI
    1. 10.1  Opening the Fusion GUI
    2. 10.2  General Settings
    3. 10.3  Changing ON_OFF_CONFIG
    4. 10.4  Pop-Up for Some Commands While Conversion is Enabled
    5. 10.5  SMBALERT# Mask
    6. 10.6  Device Info
    7. 10.7  Phase Commands
    8. 10.8  All Config
    9. 10.9  Pin Strapping
    10. 10.10 Monitor
    11. 10.11 Status

6.3 Control Loop Gain and Phase Measurement Procedure

The TPSM8D6B24EVM-2V0 includes a 49.9-Ω series resistor in the feedback loop for VOUT. The resistor is accessible at the test points TP7, TP8, TP19, and TP20 for loop response analysis. Use these test points during loop response measurements as the perturbation injecting points for the loop. See the description in Table 6-2.

Table 6-2 List of Test Points for Loop Response Measurements
Test PointNode NameDescriptionComment
VOUT_A
TP7CHA_VoutAInput to feedback divider of VOUT_AThe amplitude of the perturbation at this node must be limited to less than 30 mV.
TP8CHB_VoutAResulting output of VOUT_ABode can be measured by a network analyzer with a CH_B/CH_A configuration.
VOUT_B
TP19CHA_VoutBInput to feedback divider of VOUT_BThe amplitude of the perturbation at this node must be limited to less than 30 mV.
TP20CHB_VoutBResulting output of VOUT_BBode can be measured by a network analyzer with a CH_B/CH_A configuration.

Measure the loop response with the following procedure:

  1. Set up the EVM as described in Section 4.2.
  2. For VOUT_A, connect the isolation transformer of the network analyzer from TP7 to TP8.
  3. Connect the input signal measurement probe to TP7. Connect the output signal measurement probe to TP8.
  4. Connect the ground leads of both probe channels to TP3.
  5. On the network analyzer, measure the Bode as TP8/TP7 (Out/In).
  6. For VOUT_B, connect the isolation transformer of the network analyzer from TP19 to TP20.
  7. Connect the input signal measurement probe to TP19. Connect the output signal measurement probe to TP20.
  8. Connect the ground leads of both probe channels to TP2.
  9. On the network analyzer, measure the Bode as TP20/TP19 (Out/In).