No Longer Manufactured
TDF8554_8555 | Power Amplifier and Multiple Voltage Regulator

TDF8554_8555: I²C-Bus Controlled 4 x 45 W Power Amplifier and Multiple Voltage Regulator ARCHIVED

Overview

Archived content is no longer updated and is made available for historical reference only.

The TDF8554J is one of a new generation of complementary quad Bridge-Tied Load (BTL) audio power amplifiers with full I²C-bus controlled diagnostics, multiple voltage regulator and two power switches intended for automotive applications.

The TDF8554J 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.

The multiple voltage regulator comprises four programmable voltage regulators, one standby regulator and two power switches.

The TDF8554J is soft- and hardware downwards-compatible with its predecessor TDA8589AJ.

The TDF8554J includes features, such as selectable undervoltage for stop/start-cars which can be selected with additional I²C-bus instruction bytes. If these additional bytes are not sent, the TDF8554J has the same functionality as its predecessor IPAS TDA8589AJ.

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Features

Amplifier
- Stop/start-car prepared: keeps operating without audible disturbance during engine start at a battery voltage as low as 6 V
- I²C-bus mode (3.3 V and 5 V compliant)
- Can drive 2 Ω or 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
- Programmable gain (26 dB and 16 dB), independently programmable for the front and rear channels
- Line driver mode (16 dB and mid-tap voltage 0.25 VP for stop/start-cars)
- Programmable clip detection: 2 %, 5 % or 10 %
- Programmable thermal pre-warning
- If the temperature protection of the regulator is activated, the amplifier is muted before the regulator is switched off
- Loss of ground and open V_P safe (with 150 mΩ series impedance and a maximum supply decoupling capacitor of 2200 μF)
- 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
- Over-voltage protection (load-dump safe up to V_P = 50 V) and over-voltage pre-warning at 16 V
- Offset detection
Multiple regulator
- Good stability for any regulator with almost any output capacitor
- Five voltage regulators (microcontroller, display, audio processor, mechanical digital and mechanical drive)
- I²C-bus controlled
- Selectable output voltages for regulators 1, 4 and 5
- Low dropout voltage PNP output stages
- High supply voltage ripple rejection
- Low noise for all regulators
- Two power switches (antenna switch and amplifier switch)
- Standby regulator (microcontroller supply) operational during load dump and thermal shut-down
- Low standby quiescent current (only regulator 2 operational)
- Backup functionality for regulator 2
Protection
- If connection to the battery voltage is reversed, all regulator voltages will be zero
- Able to withstand output voltages up to 18 V if supply line is short-circuited
- Thermal protection to avoid thermal breakdown
- Load-dump protection
- Regulator outputs protected from DC short-circuit to ground or to supply voltage
- All regulators protected by foldback current limiting
- Power switches protected from loss-of-ground

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Features

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TDF8554_8555: I2C-Bus Controlled 4 x 45 W Power Amplifier and Multiple Voltage Regulator ARCHIVED

Overview

Features

sot725-1_3d

sot725-1_3d

TDF8554_8555: I²C-Bus Controlled 4 x 45 W Power Amplifier and Multiple Voltage Regulator ARCHIVED