1.

General description

The TDF8546 is one of a new generation of complementary quad Bridge-Tied Load (BTL)

audio power amplifiers intended for automotive applications. It has a best efficiency mode

operate at a battery voltage as low as 6 V making this amplifier suitable for stop/start-car

operation.

The new best efficiency principle uses a patented switch technique which reduces

switching distortion. To reduce power dissipation, the new best efficiency principle uses

the audio information on all four channels instead of only the front or rear signals.

Dissipation is more than 65 % less than standard BTL when used for front and rear

correlated audio signals. Dissipation is 35 % less than standard BTL when used for

uncorrelated (delayed) audio signals between front and rear. It is 17 % less for

uncorrelated audio signals when the front or rear information is used.

The amplifier uses a complementary DMOS output stage in a Silicon-On-Insulator (SOI)

based BCD process. The DMOS output stage ensures a high-power output signal with

perfect sound quality. The SOI-based BCD process ensures a robust amplifier, where

latch-up cannot occur, with good separation between the four independent channels, with

every component isolated and without substrate currents.

2.

Features and benefits

start at a battery voltage as low as 6 V

dissipation for uncorrelated signals compared to 2-channel best efficiency mode.

 and 4  loads

and chatter relays

rear channels

TDF8546

 45 W best efficiency amplifier

Rev. 8 — 27 September 2013

Product short data sheet