SLOA337 October   2024 TAS6584-Q1 , TAS6684-Q1

 

  1.   1
  2.   Abstract
  3. 1Introduction
  4. 2LC Filter Configuration
  5. 3Audio Performance
    1. 3.1 Inductor Performance Guide
    2. 3.2 Capacitor Selection
  6. 4Summary
  7. 5References
  8.   A Gain Compensation Biquads
  9.   Trademarks

3.1 Inductor Performance Guide

Inductance value, DCR, linearity and core loss are critical for the audio performance. Each factor detail influence is in the LC Filter Design and Inductor Selection Guide for 2.1MHz Class-D Amplifiers application notes. The selection inductor guide was created by referencing data sheets and measuring the THD+N for the inductors to illustrate inductor performance. The ranking is determined by the goal of the design. The goals are separated for output power into a load, THD, and physical dimensions.

The following tests were performed with the TAS6584-Q1 device typical applications: set up in 4 × BTL outputs with 2Ω, 4Ω, and 8Ω loads. The PWM switching frequency was set to 480kHz with PVDD supply of 24V, 35V, and 45V. Table 3-1 lists the inductors that were tested. Charts are created to compare the inductors that were tested based on the overall current handling current and all configurable LC filter configurations with different impedance loads.

Table 3-1 Inductor Specifications
Part Number Inductance (μH)

Dimensions

L × W × H (mm)		 LSAT (A) LTEMP (A) DCR (mΩ)
Chilisin AMDCDY1010J0100MA2 10 10 × 9.5 × 10.85 12 5.8 22
Chilisin AMDCDY1010J0150MA2 15 10 × 9.5 × 10.85 10 3.6 40
Cyntec VAMV1009AA-100MM2 10 10.2 × 9.2 × 10.85 12 5.8 18
Cyntec VAMV1009AA-150MM2 15 10.2 × 9.2 × 10.85 9 4.5 34
Cyntec VAMV08089A-100MM2 10 8.15 × 8.0 × 8.9 8 4 33
Coilmaster CMI-CMMPP8055H1-100M 10 8.6 × 8.1 × 5 10.5 7 45
Coilmaster CMI-TMMPB11120HL-150M 15 11 × 11 × 12.5 11 8.5 40
Coilmaster CMI-TMMPB09120HL-150M 15 9 × 11 × 12.5 10.5 8 45
Sagami DBE1316HH-100M 10 15 × 10 × 16 11.1 6.2 9
Sagami DLM1623M-100M 10 15 × 15.9 × 23 15 6.4 9
Sagami DLM1623M-150M 15 15 × 15.9 × 23 11 5.2 17.6
Sagami 7W14A-150M 15 15.5 × 14 × 16 8.4 5.2 14
Sunlord AMPR1009H-100MT 10 10.2 × 9.2 × 10.8 12 9 18
Murata DFE322520FD-1R0M=P2 1 3.2 × 2.5 × 2 7.5 4.1 22
THD vs Frequency - 2Ω, 24V PVDD Figure 3-1 THD vs Frequency - 2Ω, 24V PVDD
THD vs Frequency - 4Ω, 35V PVDD Figure 3-2 THD vs Frequency - 4Ω, 35V PVDD
THD vs Frequency - 4Ω, 45V PVDD Figure 3-3 THD vs Frequency - 4Ω, 45V PVDD
THD vs Frequency - 8Ω, 35V PVDD Figure 3-4 THD vs Frequency - 8Ω, 35V PVDD
THD vs Frequency - 8Ω, 45V PVDD Figure 3-5 THD vs Frequency - 8Ω, 45V PVDD
THD vs Power - 2Ω, 24V PVDD Figure 3-6 THD vs Power - 2Ω, 24V PVDD
THD vs Power - 4Ω, 24V PVDD Figure 3-7 THD vs Power - 4Ω, 24V PVDD
THD vs Power - 4Ω, 35V PVDD Figure 3-8 THD vs Power - 4Ω, 35V PVDD
THD vs Power - 4Ω, 45V PVDD Figure 3-9 THD vs Power - 4Ω, 45V PVDD
THD vs Power - 8Ω, 35V PVDD Figure 3-10 THD vs Power - 8Ω, 35V PVDD
THD vs Power - 8Ω, 45V PVDD Figure 3-11 THD vs Power - 8Ω, 45V PVDD