SLUUDA3 May   2025

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
    4. 1.4 Device Information
    5.     General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  7. 2Hardware
    1. 2.1 Test Setup
      1. 2.1.1 Test Equipment
      2. 2.1.2 Recommended Test Setup
    2. 2.2 Using the EVM with UCC256612
    3. 2.3 Using the EVM with UCC256613
    4. 2.4 Test Points
    5. 2.5 Terminals
    6. 2.6 Test Procedure
      1. 2.6.1 Equipment Shutdown
  8. 3Implementation Results
    1. 3.1 Performance Data and Typical Characteristic Curves
      1. 3.1.1  UCC25661EVM-128 Standalone Standby and Light Load Power
      2. 3.1.2  Efficiency, Load Regulation, Switching Frequency vs Output Current
      3. 3.1.3  Startup
      4. 3.1.4  Enhanced ZCS Avoidance During Soft Start
      5. 3.1.5  Thermal Image
      6. 3.1.6  Output Voltage Ripple
      7. 3.1.7  Load Transient Response
      8. 3.1.8  Loop Response
      9. 3.1.9  Steady State
      10. 3.1.10 X-Capacitor Discharge
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1.     Trademarks

3.1.9 Steady State

The following waveforms shows the voltage across the 10kohm(I_OPT), voltage across the resonant current sense resistor (ISNS), switch node voltage (SW) and Output Voltage (Vout) with 115 VAC, 60 Hz applied to the AC input and 390 VDC applied to the DC input. Figure 3-10, Figure 3-11, and Figure 3-12 shows the waveforms during normal switching and high frequency burst mode and low frequency burst mode respectively.

UCC25661x Steady State Waveforms at 15 A Load (Ch1= ISNS; Ch2 = Vout; Ch3 = SW; Ch4 = I_OPT) Figure 3-10 Steady State Waveforms at 15 A Load (Ch1= ISNS; Ch2 = Vout; Ch3 = SW; Ch4 = I_OPT)
UCC25661x Steady State Waveforms at 3.5 A Load (Ch1= ISNS; Ch2 = Vout; Ch3 = SW; Ch4 = I_OPT) Figure 3-11 Steady State Waveforms at 3.5 A Load (Ch1= ISNS; Ch2 = Vout; Ch3 = SW; Ch4 = I_OPT)
UCC25661x Steady State Waveforms at 0 A (Ch1= ISNS; Ch2 = Vout; Ch3 = SW; Ch4 = I_OPT) Figure 3-12 Steady State Waveforms at 0 A (Ch1= ISNS; Ch2 = Vout; Ch3 = SW; Ch4 = I_OPT)