TIDT333 may   2023


  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Input and Output Signals
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Short-Circuit Protection
    4. 3.4 Load Transients
    5. 3.5 Start-Up


This reference design is a 28-V output, 5-A synchronous buck converter for space applications operating from a 50-V to 150-V input range. The TPS7H5001-SP PWM controller controls the power stage. The INA901-SP senses the inductor current and provides current feedback to the controller enabling both average current-mode control and output short-circuit protection. If these features are not needed, the INA901-SP can be removed and the TPS7H5001-SP can be operated with voltage-mode control. The adjustable dead time of the TPS7H5001-SP allows the timing of the switching MOSFETs to be optimized and results in over 94% efficiency with a 100-V input and over 96% efficiency with a 50-V input. A self-biasing circuit is included to power the control circuits directly from the output. If an external 12-V bias is provided, the self-biasing circuit can be removed, and results in higher efficiency.