Cirrus Logic AN379 User Manual
An379
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Table of contents
Document Outline
- 1 Overview of the CS1680
- 2 Introduction
- 3 Design Process
- 3.1 Operating Parameters
- 3.2 Overview of Design Steps
- 3.3 Buck Stage Design
- Step 1) Select a Value for Boost Output Voltage
- Step 2) Select an Appropriate FET
- Step 3) Determine the Buck Stage Timing
- Step 4) Calculate Peak Current on the Buck Inductor
- Step 5) Calculate Buck Sense Resistor
- Step 6) Calculate the Buck Inductance
- Step 7) Determine the RMS Current in the Winding
- Step 8) Buck Inductor Specification
- Step 9) Determine Output Capacitor
- Step 10) Zero-current Detection
- 3.4 Boost Stage Design
- Step 11) Determine Boost Peak Current
- Step 12) Calculate Boost Sense Resistor
- Step 13) Determine Target Power
- Step 14) Boost Inductor Specifications
- Step 15) Determine Constant Peak Current for Mode 2
- Step 16) Boost Output Capacitor Selection
- Step 17) Boost Input Capacitor Selection
- Step 18) Clamp Circuit
- 3.5 Completing the Design
- 4 Design Example
- 4.1 Buck Design Steps
- Step 1) Select a Value for Boost Output Voltage
- Step 2) Select an Appropriate FET
- Step 3) Determine the Buck Stage Timing
- Step 4) Calculate Peak Current on the Buck Inductor
- Step 5) Calculate Buck Sense Resistor
- Step 6) Calculate the Buck Inductance
- Step 7) Determine the RMS Current in the Winding
- Step 8) Buck Inductor Specification
- Step 9) Determine Output Capacitor
- Step 10) Zero-current Detection
- 4.2 Boost Stage Design Steps
- Step 11) Determine Boost Peak Current
- Step 12) Calculate Boost Sense Resistor
- Step 13) Determine Target Power
- Step 14) Boost Inductor Specifications
- Step 15) Determine Constant Peak Current for Mode 2
- Step 16) Boost Output Capacitor Selection
- Step 17) Boost Input Capacitor Selection
- Step 18) Clamp Circuit
- 4.3 Final Design Steps
- 4.1 Buck Design Steps
- 5 Appendix