1FEATURES
23. PurePath™ HD Enabled Integrated Feedback
Provides:
. Signal Bandwidth up to 80 kHz for High-
Frequency Content From HD Sources
. Ultralow 0.03% THD at 1 W Into 4 Ω
. Flat THD at All Frequencies for Natural
Sound
. 80-dB PSRR (BTL, No Input Signal)
. >100-dB (A-weighted) SNR
. Click- and Pop-Free Start-Up
. Multiple Configurations Possible on the Same
PCB With Stuffing Options:
. Mono Parallel Bridge-Tied Load (PBTL)
. Stereo Bridge-Tied Load (BTL)
. 2.1 Single-Ended Stereo Pair and Bridge-
Tied Load Subwoofer
. Quad Single-Ended Outputs
. Total Output Power at 10% THD+N
. 400 W per Channel in Mono PBTL
Configuration
. 300 W per Channel in Stereo BTL
Configuration
. 145 W per Channel in Quad Single-Ended
Configuration
. High-Efficiency Power Stage (>88%) With 60-
mΩ Output MOSFETs
. Two Thermally Enhanced Package Options:
. PHD (64-Pin QFP)
. DKD (44-Pin PSOP3)
. Self-Protection Design (Including
Undervoltage, Overtemperature, Clipping, and
Short-Circuit Protection) With Error Reporting
. EMI Compliant When Used With
Recommended System Design

APPLICATIONS
• Mini Combo System
• AV Receivers
• DVD Receivers
• Active Speakers

DESCRIPTION
The TAS5631B is a high-performance PWM input
class-D amplifier with integrated closed-loop
feedback technology (known as PurePath HD technology) with the ability to drive up to 300 W (1)
stereo into 4-Ω to 8-Ω speakers from a single 50-V
supply.
PurePath HD technology enables traditional AB-
amplifier performance (<0.03% THD) levels while
providing the power efficiency of traditional class-D
amplifiers.
Unlike traditional class-D amplifiers, the distortion
curve does not increase until the output levels move
into clipping. PurePath HD™
PurePath HD technology enables lower idle losses, making the device even more efficient.
Note 1. Achievable output power levels are
dependent on the thermal configuration of the target
application. A high-performance thermal interface
material between the package exposed heat slug
and the heat sink should be used to achieve high
output-power levels.