The TDF8544J/N3,112 is one of a new generation of complementary quad Bridge-Tied Load (BTL) audio power amplifiers intended for automotiveapplications. It has full I²C-bus controlled diagnostics, including start-up diagnostics. The TDF8544J/N3,112 can operate at a battery voltage as lowas 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 stageensures a high power output signal with advanced sound quality. The SOI-based BCD process ensures a robust amplifier, where latch-upcannot occur, with good separation between the four independent channels, with every component isolated and without substratecurrents.
Feature
- 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 0.25VP)
- 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
- Over-voltage protection (load-dump safe up to VP = 50 V) with over-voltage pre-warning at 16 V
- Offset detection
