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TI introduces industryís first closed-loop PWM-input amplifier power stage


Device improves sound, reduces system cost and simplifies design in HDTVs and media docking stations

DALLAS.- Texas Instruments Incorporated (TI) (NYSE:TXN) today introduced the industryís first PWM-input 20-Watt stereo Class-D power stage with closed-loop feedback. Extending TIís portfolio of closed-loop architecture offerings, the highly efficient power stage produces a more accurate sound, improves EMC performance, and relaxes power supply performance requirements to lower system cost. The flexible device supports multiple output configurations and includes a simple PWM interface to a video or audio processor to ease design and speed time to market for manufacturers of LCD, plasma and DLPģ TVs and media docking stations. (See

Closing the loop in digital performance while lowering system cost

Improving audio performance, the closed loop architecture of the TAS5601 enables the audio subsystem greater control over the speaker, reproducing a more accurate sound with improved bass response. The superior power supply rejection ratio (PSRR) of closed loop architectures reduces power supply noise coupling into the audio band, allowing engineers to design lower-cost power supplies. The EMC performance is also greatly improved by slowing down the output edge transitions while still maintaining excellent THD+N. The TAS5601 is more than 90 percent efficient and requires only two supplies, a 3.3 V and 10 V to 26 V rail. Supporting operation up to +26 V allows LCD-TV manufacturers to power the device off the existing +24 V backlight rail, eliminating the need for a dedicated audio power rail and further lowering system cost.

In addition, the TAS5601 is fully protected with integrated self-protection circuits against faults including over-voltage, under-voltage, over-temperature and short circuit. Short-circuit faults and thermal warnings are reported back to the system controller.

Device flexibility eases design and reduces development time

The flexible platform of the TAS5601 supports multiple output configurations for driving two bridge-tied speakers, four single-ended speakers, or a combination of single and bridge-tied speakers for 2.1 system support. To further simplify design and speed time to market, the TAS5601 includes a simple PWM interface to a video processor or a digital audio processor such as TIís recently introduced TAS3308 audio System on a Chip (SoC). For more information see

Pricing and availability

The TAS5601 is available today in a 56-pin HTTSOP package. The TAS5601 is priced at $2.00 in 1000-piece quantities.

Extending TIís offering for home entertainment audio

The TAS5601 joins TIís complete offering for home entertainment audio and extends TIís portfolio of closed-loop architecture offerings for the HDTV and media docking station markets. From industry-leading digital signal processors (DSPs) and high-performance analog to logic and an extended portfolio of application software, TI delivers reliable, scalable and power-efficient solutions for simple and complex audio designs. For more information see the Audio Solutions Guide at


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