TIDT244 July   2021

 

  1. 1Description
  2. 2Test Prerequisites
    1. 2.1 Voltage and Current Requirements
    2. 2.2 Required Equipment
  3. 3Testing and Results
    1. 3.1 Thermal Images
    2. 3.2 Efficiency and Power Dissipation Graph
    3. 3.3 Efficiency and Power Dissipation Data
    4. 3.4 Current Regulation
    5. 3.5 Voltage Regulation
  4. 4Waveforms
    1. 4.1 Start-up
    2. 4.2 Switch Node
    3. 4.3 Output Voltage Ripple
    4. 4.4 Current Loop to Voltage Loop Transition
    5. 4.5 Voltage Loop to Current Loop Transition
    6. 4.6 Bias Voltage Start-up
    7. 4.7 Bias Voltage Switch Nodes
    8. 4.8 Output Current Sense Signal

4.7 Bias Voltage Switch Nodes

The +18-V and –5-V rails are converted from an external 12-V bias signal. The following figures show the switching behaviors of these bias converters.

GUID-20210611-CA0I-MJ14-K5XL-1KJR76NKXB8V-low.png Figure 4-13 +18 V Boost Converter Switch Node at TP9, VIN = 400 V and VOUT = 400 V at 2 A (5 V/DIV, 200 ns/DIV, BWL = 800 MHz)
GUID-20210611-CA0I-N3XW-NDKF-0DFDQJKJXMXC-low.png Figure 4-14 –5 V Inverting Buck-Boost Converter Switch Node at TP17, VIN = 400 V and VOUT = 400 V at 2 A (5 V/DIV, 200 ns/DIV, BWL = 800 MHz)