TAS2555 4.0W クラス-D モノ・オーディオ・アンプ、SmartAmp 付き - TAS2555

TAS2555 (供給中)

TAS2555 4.0W クラス-D モノ・オーディオ・アンプ、SmartAmp 付き


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The TAS2555 device is a state-of-the-art Class-D audio amplifier which is a full system on a Chip (SoC). The device features a ultra low-noise audio DAC and Class-D power amplifier which incorporates speaker voltage and current sensing feedback. An on-chip, low-latency DSP supports Texas Instruments SmartAmp speaker protection algorithms to maximizes loudness while maintaining safe speaker conditions.

The device can be used easily with any processor with an I2S output and stereo implementations are possible when using two TAS2555 devices. Separate tuning for different speakers is supported allowing customers to add value while maintaining form factor designs. Additionally, the TAS2555 supports separate voice and audio tuning dynamically with ultra-low 15.9 µV ICN regardless of mode of operation making receiver/speaker implementations possible.

A Class-H boost converter generates the Class-D amplifier supply rail. When the audio signal only requires a lower Class-D output power, the boost improves system efficiency by deactivating and connecting VBAT directly to the Class-D amplifier supply. When higher audio output power is required, the multi-level boost quickly activates tracking the signal to provide the additional voltage to the load.


  • Ultra Low-Noise Mono Boosted Class-D Amplifier
    • 5.7 W at 1% THD+N and 6.9 W at 10% THD+N into 4-Ω Load from 4.2-V Supply
    • 3.8 W at 1% THD+N and 4.5 W at 10% THD+N into 8-Ω Load from 4.2-V Supply
  • Output Noise for DAC + Class-D (ICN) is 15.9 µV
  • DAC + Class-D SNR 111 dB at 1%THD+N/8 Ω
  • THD+N –90 dB at 1 W / 8 Ω with Flat Frequency Response
  • PSRR 110 dB for 200 mVpp ripple at 217 Hz
  • Input Sample Rates from 8 kHz to 96 kHz
  • Built-In Speaker Sense
    • Measures Speaker Current and Voltage
    • Measures VBAT Voltage, Chip Temperature
  • Dedicated Real-Time DSP for Speaker Protection
    • Thermal and Excursion Protection
    • Detects Speaker Leaks and Damage
  • High Efficiency Class-H Boost Converter With Multi-Level Tracking
    • 86% at 500 mW in 8 Ω with 3.6 V VBAT
    • 87% at 700 mW in 8 Ω with 4.2 V VBAT
  • Configurable Automatic Gain Control (AGC)
    • Limits Battery Current Consumption
  • Adjustable Class-D Switching Edge-Rate Control
  • Thermal, Short-Circuit, and Under-Voltage Protection
  • I2S, Left-Justified, Right-Justified, DSP, and TDM Input and Output Interface,
  • I2C or SPI Interface for Register Control
  • Stereo Configuration Using Two TAS2555 Devices
  • Power Supplies
    • Boost Input: 2.9 V to 5.5 V
    • Analog/Digital: 1.65 V to 1.95 V
    • Digital I/O: 1.62 V to 3.6 V
  • 42-ball, 0.5-mm pitch, DSBGA package

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機能一覧 他の製品と比較 スピーカ・アンプ Class AB/Class D

Analog Supply (V) (Min)
Analog Supply (V) (Max)
Speaker Channels (Max)
Audio Input Type
Output Power (W)
Load (Min) (ohms)
Iq (Typ) (mA)
Iq (Max) (mA)
THD + N @ 1 kHz (%)
Iq per channel (Typ) (mA)
Package Size: mm2:W x L (PKG)
Operating Temperature Range (C)
Control Interface
Shutdown Current (ISD) (uA)
TAS2555 TAS2552 TAS2553 TAS2560
2.95    2.7    2.7    2.9   
5.5    5.5    5.5    5.5   
Class D Boosted
Smart Amp   
Class D Boosted
Smart Amp   
Class D Boosted    Class D Boosted
Smart Amp   
Mono    Mono    Mono    Mono   
Digital Input    Analog Input
Digital Input   
Analog Input
Digital Input   
Digital Input   
5.7    4    2.8    5.6   
4    6    6    4   
3    6.54    7.1    3.2   
20    8.34    8.03    10.6   
0.02    0.1    0.9    0.004   
110    75    75    110   
3    6.54    7.1    3.2   
42DSBGA    30DSBGA    30DSBGA    30DSBGA   
See datasheet (DSBGA)    See datasheet (DSBGA)    See datasheet (DSBGA)    See datasheet (DSBGA)   
-40 to 85    -40 to 85    -40 to 85    -40 to 85   
I2C    I2C    I2C   
0.1    0.2    0.2    0.1   
Catalog    Catalog    Catalog    Catalog