SLUUCK6A December   2021  – February 2022 TPSM8D6C24

 

  1.   Trademarks
  2. 1 Description
    1. 1.1 Before You Begin
    2. 1.2 Features
  3. 2 Electrical Performance Specifications
  4. 3 Schematic
  5. 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
  6. 5 EVM Configuration Using the Fusion GUI
    1. 5.1 Configuration Procedure
  7. 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
  8. 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
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 Bill of Materials
  11. 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
  12. 12Revision History

6.3 Control Loop Gain and Phase Measurement Procedure

The TPSM8D6C24EVM-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. These test points should be used 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 Point Node Name Description Comment
VOUT_A
TP7 CHA_VoutA Input to feedback divider of VOUT_A The amplitude of the perturbation at this node should be limited to less than 30 mV.
TP8 CHB_VoutA Resulting output of VOUT_A Bode can be measured by a network analyzer with a CH_B/CH_A configuratio.n
VOUT_B
TP19 CHA_VoutB Input to feedback divider of VOUT_B The amplitude of the perturbation at this node should be limited to less than 30 mV.
TP20 CHB_VoutB Resulting output of VOUT_B Bode 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).