Class-D LC Filter Designer




Calculate and design audio Class-D LC filters in minutes using the Class-D LC Filter Designer.  Select from 4 different filter types based on Class-D output, switching topology and performance.  Input corner frequency and quality (Q) factor to fine tune the audio frequency response.  Finally, verify the selected LC components with multiple speaker loads using the frequency response graph and Q-factor calculations.  The Class-D LC Filter Designer is the perfect quick and easy tool to get started on your next Class-D audio design!
  • Calculate LC filter inductor and capacitor values quickly
  • Select from 4 different Class-D filter types
  • Tune frequency response with corner frequency and quality factor (Q) inputs
  • Verify and graph filter response with multiple speaker loads


Calculation tool

Class-D LC Filter Designer SLAC729.ZIP (280KB)

Supported products & hardware
Design tool

TPA3251 Inductor Study SLAC736.ZIP (167KB)

Supported products & hardware

Supported products & hardware

Speaker amps
TAS3251 175-W stereo, 350-W mono, 12- to 38-V supply, digital input Class-D Smart Audio Amplifier TPA3255 315-W stereo, 600-W mono, 18- to 53.5-V supply, analog input Class-D audio amplifier
Evaluation board
TAS5634EVM TAS5634 300W Stereo/600W Mono HD Digital Input, 58V Class-D Amplifier Power Stage Evaluation Module TPA3221EVM TPA3221 100W Stereo/ 200W Mono HD Analog-In Class-D Amplifier Evaluation Module TPA3244EVM TPA3244 60W Stereo / 110W Peak Ultra-HD Analog-In Audio Class-D Pad-Down Module TPA3245EVM TPA3245 115W Stereo / 230W Mono Ultra-HD Analog-In Audio Class-D Module TPA3250D2EVM TPA3250 70W Stereo / 130W Peak Ultra-HD Analog-In Audio Class-D Pad-Down Module TPA3251EVM TPA3251 175W Stereo / 350W Mono Ultra-HD, Analog-In Class-D Module TPA3255EVM TPA3255 315W Stereo / 600W Mono Ultra-HD Analog-In Audio Class-D Module

Technical documentation

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Type Title Date
Application note LC Filter Design (Rev. A) Nov. 09, 2016

Support & training

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