TIDT293 October   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Design Variants
  5. 2Design Overview
    1. 2.1 Board Contents
    2. 2.2 Connector Description
    3. 2.3 User Interface
      1. 2.3.1 Switches and Push-buttons
      2. 2.3.2 Jumpers
      3. 2.3.3 Potentiometers
    4. 2.4 Functional Block Diagram
    5. 2.5 Functional Block Descriptions
  6. 3Features and Performance Curves
    1. 3.1  Test Setup
    2. 3.2  Pulse
    3. 3.3  Levels and Free Run
    4. 3.4  INP
    5. 3.5  Dual-Output Power Supply
    6. 3.6  Overtemperature Protection
    7. 3.7  Slew Rate Adjust
    8. 3.8  Settling Time Adjust
    9. 3.9  Low- and High-Level Adjust
    10. 3.10 Pulse-Width Adjust
    11. 3.11 Period and Delay Adjust
    12. 3.12 Frequency Response
  7. 4Operation
    1. 4.1 Initial Setup – Jumper Selection and Potentiometer Settings
    2. 4.2 Procedure
      1. 4.2.1 Initial Power Up
      2. 4.2.2 Connecting the Circuit Under Test
  8. 5Limitations and Capabilities
    1. 5.1 Wiring Inductance
    2. 5.2 Minimum Voltage
    3. 5.3 Battery Life
  9. 6Typical Failure Mechanism
    1. 6.1 Fast Thermal Failure
    2. 6.2 Slow Thermal Failure

3.8 Settling Time Adjust

The settling time adjustment is made by turning potentiometer R43. There are no jumpers to set the range of this feature. Depending on the setup inductance and magnitude of the current step, a low R43 value can cause an unstable oscillatory state (see limitations of wiring inductance). The following data was taken on the 50-V, 125-A variant using the PSMN008-75B Q2 FET.

The following capture shows an underdamped load step by decreasing settling time potentiometer R43.

GUID-20220531-SS0I-PL72-2DWB-TBWZ6N3LSQZT-low.pngFigure 3-14 Maximum Slew Rate, 10-V Output, 1-A to 30-A Underdamped Load Transient

The following capture shows an overdamped load step by increasing the settling time potentiometer R43 to the maximum value.

GUID-20220531-SS0I-2DCH-TWJX-QP6FCS6MSHGZ-low.pngFigure 3-15 Maximum Slew Rate, 10-V Output, 1-A to 30-A Overdamped Load Transient

The following capture shows a critically damped load step. If minimizing overshoot is needed, increase the positive and negative slew rate.

GUID-20220531-SS0I-N0KH-ZSGL-JZVR2MC5JZQF-low.pngFigure 3-16 Maximum Slew Rate, 10-V Output, 1-A to 30-A Critically Damped Load Transient