80W Class-D amplifier maximises thermal and audio performance

Making the most of the size and efficiency advantages of Class-D amplifiers, the TDF8590TH from NXP Semiconductors combines a complete 80W stereo amplifier, including output transistors, with an integrated heatsink in a single package.

Minimal external component requirements include a second order, low-pass filter between the TDF8590TH and the speakers.

In addition to supplying 2 x 80W stereo audio into 4Ω speakers, the TDF8590TH can be used as a 160W mono amplifier in a Bridge-Tied Load (BTL) configuration. In addition to this high output power, the amplifier also delivers high audio performance. With zero dead-time switching aiding low-distortion operation, designers can achieve Total Harmonic Distortion plus Noise (THD+N) as low as 0.02%. There is also no DCoffset induced pop noise at mode transitions.

Built-in protection features include thermal foldback to reduce gain at high die temperatures, over-temperature protection, over-current protection, over-voltage protection and window protection that prevents start-up if a short-circuit is present at the outputs.

The amplifier achieves high operating efficiency of up to 90%, which reduces the total amplifier size and eases thermal design. In addition, the plastic HSOP-24 package includes an integrated copper heat slug, which can be directly soldered to the PCB pad or a heat spreader. The high thermal properties of the package help to reduce the need for additional external heatsinks.

 

FEATURES Supply-voltage range: ±14V to ±29V 8A peak output-drive capability Sub-500µA stand-by current Operating frequency range: 200kHz to 560kHz

APPLICATIONS Car audio systems Small public address systems In-vehicle public-transport announcers

 

NXP Semiconductors/TDF8590TH