TDF8544: I²C-Bus Controlled 4 x 50 W Power Amplifier

Overview

The TDF8544 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 TDF8544 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 advanced 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 0.25V_P)
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 V_P or to ground) on pin DIAG
Loss-of-ground and open V_P 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
Over-voltage protection (load-dump safe up to V_P = 50 V) with over-voltage pre-warning at 16 V
Offset detection

MoreLess

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 0.25V_P)
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 V_P or to ground) on pin DIAG
Loss-of-ground and open V_P 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
Over-voltage protection (load-dump safe up to V_P = 50 V) with over-voltage pre-warning at 16 V
Offset detection

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TDF8544: I2C-Bus Controlled 4 x 50 W Power Amplifier

Overview

Features

TDF8544: I²C-Bus Controlled 4 x 50 W Power Amplifier