10-W Mono Class-D Audio Power Amplifier with SpeakerGuard™ (TPA3111) - TPA3111D1


10-W Mono Class-D Audio Power Amplifier with SpeakerGuard™ (TPA3111)

Recommended alternative parts

  • TAS5421-Q1  -  Includes integrated diagnostics and load dump functions


The TPA3111D1 is a 10-W efficient, Class-D audio power amplifier for driving a bridge tied speaker. Advanced EMI Suppresion Technology enables the use of inexpensive ferrite bead filters at the outputs while meeting EMC requirements. SpeakerGuard™ speaker protection system includes an adjustable power limiter and a DC detection circuit. The adjustable power limiter allows the user to set a "virtual" voltage rail lower than the chip supply to limit the amount of current through the speaker. The DC detect circuit measures the frequency and amplitude of the PWM signal and shuts off the output stage if the input capacitors are damaged or shorts exist on the inputs.

The TPA3111D1 can drive a mono speaker as low as 4Ω. The high efficiency of the TPA3111D1, > 90%, eliminates the need for an external heat sink when playing music.

The outputs are fully protected against shorts to GND, VCC, and output-to-output. The short-circuit protection and thermal protection includes an auto-recovery feature.


  • 10-W into an 8-Ω Load at 10% THD+N From a 12-V Supply
  • 7-W into an 4-Ω Load at 10% THD+N From a 8-V Supply
  • 94% Efficient Class-D Operation into 8-Ω Load Eliminates Need for Heat Sinks
  • Wide Supply Voltage Range Allows Operation from 8 to 26 V
  • Filter-Free Operation
  • SpeakerGuard Speaker Protection Includes Adjustable Power Limiter plus DC Protection
  • Flow Through Pin Out Facilitates Easy Board Layout
  • Robust Pin-to-Pin Short Circuit Protection and Thermal Protection with Auto-Recovery Option
  • Excellent THD+N/ Pop Free Performance
  • Four Selectable, Fixed Gain Settings
  • Differential Inputs
    • Televisions
    • Monitor/Laptop
    • Consumer Audio Equipment

SpeakerGuard Is a trademark of Texas Instruments

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Parametrics Compare all products in Mid/High-Power Amplifier

Max. Power to Bridge Tied Load
Min. Supported Bridge Tied Load
Closed/Open Loop
Max Speaker Outputs (#)
Input Type
Control Type
Analog Supply Min [V]
Analog Supply Max [V]
Power Stage Supply Min (V)
Power Stage Supply Max (V)
Operating Temperature Range (C)
Approx. Price (US$)
TPA3111D1 TPA3111D1-Q1 TPA3112D1 TPA3112D1-Q1
10     10     25     25    
4     4     4     4    
Closed     Closed     Closed     Closed    
1     1     1     1    
Analog     Analog     Analog     Analog    
Hardware     Hardware     Hardware     Hardware    
8       8     8    
26       26     26    
8     8     8     8    
26     26     26     26    
Catalog     Automotive     Catalog     Automotive    
-40 to 85       -40 to 85     -40 to 125    
0.75 | 1ku     0.90 | 1ku     1.10 | 1ku     1.21 | 1ku    
Class D     Class D     Class D      

Other qualified versions of TPA3111D1

Version Part Number Definition
Automotive TPA3111D1-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

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