SLUAAY9 August   2024 TPS543320 , TPS543620 , TPS543820

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Choosing Component Values
    1. 2.1 Capacitor
    2. 2.2 Resistor
    3. 2.3 Clock Signal
    4. 2.4 Schottky Diode
  6. 3Results
    1. 3.1 Waveforms
    2. 3.2 Bill of Materials
  7. 4Summary
  8. 5References

4 Summary

This application note introduces how to utilize an AC coupled circuit to keep the signal from a clock generator within the absolute voltage ratings for the SYNC/FSEL pin to avoid damaging the DC/DC converter. This circuit is designed to adhere to the synchronization high-level input voltage threshold of 1.8V for the device and the absolute minimum input voltage on the SYNC/FSEL pin of -0.3V. Acceptable component values are discussed and results of a typical application circuit are shown. For a standard clock voltage of 3.3V, we found that an R1 value of 1.1kΩ, C1 value from 1nF to 100nF and a BAT54W satisfied the SYNC/FSEL pin requirements for the TPS543620.