SLVUDS2 June   2026

 

  1.   1
  2.    Description
  3.   Get Started
  4.    Features
  5.    Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Overview
    2. 2.2 TPS7B780x-Q1
      1. 2.2.1 TPS7B780x-Q1 Jumpers
      2. 2.2.2 TPS7B780x-Q1 Interfaces
    3. 2.3 Pullup Regulator
      1. 2.3.1 Pullup Regulator Jumpers
    4. 2.4 USB-to-I2C Adapter
      1. 2.4.1 USB-to-I2C Adapter Jumpers
      2. 2.4.2 USB-to-I2C Adapter Interfaces
      3. 2.4.3 USB-to-I2C Adapter LEDs
      4. 2.4.4 USB-to-I2C Adapter BSL Pushbutton
    5. 2.5 Load Transient Circuit
      1. 2.5.1 Using the Load Transient Circuit
      2. 2.5.2 Load Transient Circuit Interfaces
    6. 2.6 EVM Setup
    7. 2.7 Test Points
    8. 2.8 Required Equipment for Basic Evaluation
  9. 3Software
    1. 3.1 Software Download
      1. 3.1.1 Live Software on dev.ti.com
      2. 3.1.2 Offline Software
        1. 3.1.2.1 Download From dev.ti.com
    2. 3.2 Home Tab
    3. 3.3 Quick Setup Tab
    4. 3.4 Monitor Tab - Dashboard Page
    5. 3.5 Monitor Tab - Configure Page
    6. 3.6 ADC Graph Tab
    7. 3.7 Registers Tab
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  11. 5Additional Information
    1. 5.1 Trademarks

2.5 Load Transient Circuit

The EVM includes a circuit to evaluate transient load regulation in the user's application. This transient load circuit is available on channel 2 of the TPS7B7802Q1, or on the output of the TPS7B7801Q1.

The load transient circuit uses an ultra-fast low-side gate driver, the LMG1020, to rapidly switch MOSFET Q1, connecting a transient load resistance to the LDO output. Other connections allow a steady-state DC load to be applied. The load transient circuit can be used in two configurations, described below.

The ultra-fast output rise time and fall time of the LMG1020 (typically 375ps rising and 350ps falling) allow for extremely fast rising and falling load current profiles to be evaluated.

The AEC-Q100 qualified LMG1020Q1 is available for automotive applications.

Typical configuration

The typical configuration allows for load current to be measured at current measurement point IOUT_2 using common clamp-style oscilloscope current probes. In this configuration, the steady-state DC load is connected to terminal block J34 and the transient load resistance is installed in one or more of resistors R21, R22, R23, R24, or R25.

High-speed configuration

The inductance of the current measurement loop in the typical configuration described above can limit the risetime of the load current. If faster transients are needed, the high-speed configuration can be used instead.

In this configuration, the transient load is provided by R20 and the steady-state DC load is provided by the series combination of R20 and R29. In this configuration, J33 is provided for differential voltage measurement across R20, from which load current can be calculated.