TDF8541TH

音频放大器 I C-bus controlled 4 x 45 W power amplifier

Overview

The TDF8541 is one of a new generation of complementary quad Bridge-Tied Load BTL audio power amplifiers intended for automotive applications. It has full I²C-bus controlled diagnostics, including start-up diagnostics. The TDF8541 can operate at a battery voltage as low as 6 V making this amplifier suitable for stop/start-car operation.

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.

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## Features

* Stop/start-car prepared: keeps operating without audible disturbance during engine start at a battery voltage as low as 6 V

* Operates in either legacy non I²C-bus or I²C-bus modes 3.3 V and 5 V compliant

* Four hardware-programmable I²C-bus addresses

* Can drive 2 Ω and 4 Ω loads

* Speaker fault detection

* Start-up diagnostics with load detection: open, short, present; filtered for door-slam and chatter relays

* AC load tweeter detection with low and high current mode

* Gain select after start-up without audible disturbance

* Independent selectable soft mute of front and rear channels

* Programmable gain 26 dB and 16 dB, independently programmable for the front and rear channels

* Line driver mode supports engine start at a battery voltage as low as 6 V 16 dB and mid-tap voltage 0.25 x VP

* Programmable clip detect: 2 %, 5 % or 10 %

* Programmable thermal pre-warning

* Pin STB can be programmed/multiplexed with second-clip detect

* Clip information of each channel can be directed separately to pin DIAG or pin STB

* Independent enabling of thermal- , clip- or load fault information short across the load or to VP or to ground on pin DIAG

* Loss-of-ground and open VP safe minimum series resistance required

* All amplifier outputs short-circuit proof to ground, supply voltage and across the load channel independent

* All pins short-circuit proof to ground

* Temperature controlled gain reduction to prevent audio holes at high junction temperatures

* Programmable low battery voltage detection to enable 7.5 V or 6 V minimum battery voltage operation

* Overvoltage protection load-dump safe up to VP = 50 V with overvoltage pre-warning at 16 V

* Offset detection

## Features