SLUAAG4 February   2022 TPS62933

 

  1.   Trademarks
  2. 1Introduction
  3. 2Loop Response of Peak Current Mode Converter
  4. 3Output Capacitance Upper Limit for Internally-Compensated PCM Buck Converter
  5. 4Output Capacitance Lower Limit for Internally-Compensated PCM Buck Converter
  6. 5Design Example and Experimental Validation for TPS62933
  7. 6Summary
  8. 7References
  9.   A Validation and Calculating the Output Capacitance Upper Limit

1 Introduction

Peak current mode control is widely used in buck controllers and converters due to its advantages for good dynamic performance and easy compensation. Most peak current mode converters have a COMP pin and customers can implement type 2 or type 3 external compensation by adjusting external resistors and capacitors. In recent years, internal compensation attracts more and more attention to reduce solution size and achieve simple application design. The TPS62933 is a buck converter with an internally compensated peak current mode that supports 3.8- to 30-V input voltage and maximum 3-A output current. The device has superior features like low IQ and a wide output voltage range. Compared to the conventional PCM devices, it does not need external resistors or capacitors for compensation setting, but the stability restriction limits the range of inductance and output capacitance.

For common applications, components can be selected based on the recommended table and implement fast design for application. For special application design to choose large output capacitance or small output capacitance, a stability design method is proposed in this application report. The application with a feedforward capacitor is not included in the analysis.