SLUAAG5 March   2022 TPS62933

 

  1.   Trademarks
  2. 1Introduction
  3. 2Cff in High-Output Voltage Internally Compensated PCM Buck Converter
  4. 3Effects of Cff on the Loop
  5. 4Method for Selecting Cff
  6. 5Experimental Verification for TPS62933
  7. 6Summary
  8. 7References
  9.   A Validation Results for the Proposed Method

6 Summary

A selection method for feedforward capacitors is proposed in this application note for TPS62933, based on loop stability analysis. First, the necessity of adding Cff in an application with high output voltage is analyzed. Then the impacts of the Cff on the converter loop is introduced and a method to choose Cff for stability is proposed by ensuring –20 dB/dec gain slope at gain crossover frequency. Compared with previous methods, the bode plot test results without Cff are not needed to get recommended Cff value, which makes the method more applicable in application design. The proposed methods expressed in this application note are verified by experiment.