SLVAFQ0 October   2025 TPS61299

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Start-up
    1. 2.1 Body Diode Pass
    2. 2.2 Pre-Charge
    3. 2.3 Down Mode
  6. 3Output Short Protection
    1. 3.1 Continuous Reboot
      1. 3.1.1 Continuous Reboot by Pre-charge
      2. 3.1.2 Continuous Reboot by Down Mode
    2. 3.2 Hiccup Reboot
      1. 3.2.1 Hiccup Reboot by Pre-charge
      2. 3.2.2 Hiccup Reboot by Down Mode
    3. 3.3 Boost Converter Short-Circuit Protection Behavior Summary
  7. 4Boost Converter Start-Up Behavior Summary
  8. 5References

Abstract

The boost converter is capable of producing a DC output voltage higher than the input voltage. For common nonsynchronous boost converters, there is a risk that when the output voltage is below input during start-up or output short conditions, the high-side diode can always be forward biased and the current can be out of control.

To overcome these drawbacks of the nonsynchronous boost converters, TI applies multiple control strategies and topologies to limit the inductor current under start-up or output short conditions. This application note introduces different ways to achieve soft start-up and output short current limit.