TI 公司的TAS5601是 20W（每路）高效立体声数字放大器功率级，可以驱动4个单端扬声器，两个桥接扬声器或者它们的组合，扬声器阻抗可低至4欧姆，8欧姆负载时的效率大于90%，因此不需要外接散热器。本文介绍了TAS5601的主要性能，BTL应用电路和单端应用电路，以及TAS5601EVM评估板的主要性能和详细的电路图和材料清单。

The TAS5601 is a 20-W (per channel) efficient, stereo digital amplifier power stage for driving 4 single-ended speakers, 2 bridge-tied speakers, or combination of single and bridge-tied loads. The TAS5601 can drive a speaker with an impedance as low as 4ohm. The high efficiency, >90% into 8-ohm loads, of the TAS5601 eliminates the need for an external heat sink.



A simple interface to a digital audio PWM processor is shown below. The TAS5601 is fully protected against faults with short-circuit protection and thermal protection as well as overvoltage and undervoltage protection. Faults are reported back to the processor to prevent devices from being damaged during overload conditions.

主要特性：
Supports Multiple Output Configurations
2×20-W into a 8-ohm BTL Load at 18 V
4×10-W into a 4-ohm SE Load at 18 V
2×10W (SE) + 1×20W (BTL) at 18 V
Thermally Enhanced Package
DCA (56-pin HTTSOP)
Wide Voltage Range: 10V—26V
No Separate Supply Required for Gate Drive

Efficient Class-D Operation Eliminates Need for Heat Sinks
Closed Loop Power Stage Architecture
Improved PSRR Reduces Power Supply Performance Requirements
High Damping Factor Provides for Tighter, More Accurate Sound With Improved Bass Response
Constant Output Power Over Variation in Supply Voltage
Differential Inputs
Integrated Self-Protection Circuits Including Overvoltage, Undervoltage, Overtemperature, and Short Circuit With Error Reporting
应用：

Flat-Panel, Rear-Projection, and CRT TV



图1. TAS5601简化的应用电路图



图2. TAS5601 BTL应用电路



图3. TAS5601单端（SE）应用电路图

TAS5601EVM评估板
The TAS5601EVM is a complete 2-channel digital audio amplifier system. Also included in the kit is a MC5601 board that includes a USB interface, a digital input (SPDIF), analog inputs via the ADC, and other features like a mute function and power down. The TAS5601EVM can be used as a stand-alone board by wiring it into a system or it can be connected to the MC5601 board for a complete evaluation platform.



图4. TAS5601EVM评估板外形图



图5.EVM控制器板 (MC5601)



图6.完整的系统和EVM信号通路框图