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reference designTPA3251 | Demoboard SLAA701A

Texas Instruments TPA3251 | Demoboard SLAA701A

LC Filter Design

Overview

TopologyOther Topology
IC revisionA

Description

In higher-power class-D amplifiers, generally above 10 W of output power, a filter on the output of theamplifier is required. The filter is passive in nature and uses both an inductor and a capacitor on eachoutput terminal. Therefore, it is referred to as an LC filter. Proper component selection of the LC filter iscritical to meet the desired audio performance, efficiency, EMC/EMI requirements, and cost for the endapplication. This application report serves as a guide to aid in the section of LC filter components forclass-D amplifiers to meet target-design goals of the end system.

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Data­sheet
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Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
RDC max.(mΩ)
Wire Type
SamplesAvailability & Sample
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7443556680
SPECWE-HCI SMT Flat Wire High Current Inductor, 6.8 µH, 22 A
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance6.8 µH
Performance Rated Current22 A
Saturation Current @ 10%13 A
Saturation Current @ 30%27 A
DC Resistance4.1 mΩ
Self Resonant Frequency24 MHz
MaterialWE-PERM 2 
Packaging Unit150 
DC Resistance4.428 mΩ
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7443630700
SPECWE-HCF SMT High Current Inductor, 7 µH, 19.5 A
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance7 µH
Performance Rated Current19.5 A
Saturation Current @ 10%27 A
Saturation Current @ 30%30 A
DC Resistance5.61 mΩ
Self Resonant Frequency18 MHz
MaterialMnZn 
Packaging Unit100 
DC Resistance6.17 mΩ
Wire TypeFlat 
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7443551730
SPECWE-HCI SMT Flat Wire High Current Inductor, 7.3 µH, 16.5 A
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance7.3 µH
Performance Rated Current16.5 A
Saturation Current @ 10%5.5 A
Saturation Current @ 30%12 A
DC Resistance5.9 mΩ
Self Resonant Frequency28 MHz
MaterialWE-PERM 
Packaging Unit400 
DC Resistance6.49 mΩ
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7443557760
SPECWE-HCI SMT Flat Wire High Current Inductor, 7.6 µH, 22.8 A
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance7.6 µH
Performance Rated Current22.8 A
Saturation Current @ 10%19 A
Saturation Current @ 30%22 A
DC Resistance3.75 mΩ
Self Resonant Frequency20 MHz
MaterialMnZn 
Packaging Unit150 
DC Resistance4 mΩ
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74435561100
SPECWE-HCI SMT Flat Wire High Current Inductor, 10 µH, 16.5 A
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Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance10 µH
Performance Rated Current16.5 A
Saturation Current @ 10%10 A
Saturation Current @ 30%21.5 A
DC Resistance6.9 mΩ
Self Resonant Frequency14 MHz
MaterialWE-PERM 2 
Packaging Unit150 
DC Resistance7.452 mΩ
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74435571100
SPECWE-HCI SMT Flat Wire High Current Inductor, 10 µH, 16.4 A
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance10 µH
Performance Rated Current16.4 A
Saturation Current @ 10%8.8 A
Saturation Current @ 30%18.5 A
DC Resistance6.9 mΩ
Self Resonant Frequency16 MHz
MaterialMnZn 
Packaging Unit150 
DC Resistance7.45 mΩ
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7443631000
SPECWE-HCF SMT High Current Inductor, 10 µH, 16.15 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance10 µH
Performance Rated Current16.15 A
Saturation Current @ 10%22 A
Saturation Current @ 30%23 A
DC Resistance7.96 mΩ
Self Resonant Frequency13 MHz
MaterialMnZn 
Packaging Unit100 
DC Resistance8.76 mΩ
Wire TypeFlat 
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