The TDF8541SD/N2,112 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 controlleddiagnostics, including start-up diagnostics. The TDF8541SD/N2,112 can operate at a battery voltageas 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 withadvanced sound quality. The SOI-based BCD process ensures a robust amplifier, wherelatch-up cannot occur, with good separation between the four independent channels, withevery component isolated and without substrate currents.
Feature
- Stop/start-car prepared: keeps operating without audible disturbance during enginestart 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-slamand 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 andrear channels
- Line driver mode supports engine start at a battery voltage as low as 6 V (16 dB andmid-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 loador 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 junctiontemperatures
- Programmable low battery voltage detection to enable 7.5 V or 6 V minimum batteryvoltage operation
- Over-voltage protection (load-dump safe up to VP = 50 V) with over-voltage pre-warningat 16 V
- Offset detection
