Simple Structural Improvement in PWM Boost Converter and PWM Controller Solves Malfunctions Caused when VOUT < VIN

This article describes how a simple structural improvement in a traditional boost converter and a simple PWM controller allows you to achieve I/O disconnect, eliminating malfunctions when VOUT < VIN. A boost converter configured, and a controller controlled with an I/O disconnect function, provides the following benefits:
  • Programmable soft turn-on for inrush current control
  • Hiccup mode for over-current protection
  • Complete shutdown with source-load separation
  • Simple loop compensation
  • Protection for power MOSFET (Q2) failure

These are important benefits for high-performance power supplies in low- to medium-power applications.

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