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TPA3106D1VFPR

40W mono Class-D audio amp, 10-26V, 92% efficiency, 4 gain settings, HLQFP-32 7x7mm

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Pieza del fabricante：

TPA3106D1VFPR

Paquete：

HLQFP-32 (7x7mm) with exposed pad

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Descripción

Productos

The TPA3106D1VFPR from Texas Instruments is a 40W mono Class-D audio power amplifier operating from 10V to 26V with approximately 92% efficiency, eliminating the need for an external heat sink. It features four selectable fixed gain settings (20/26/32/36 dB), differential inputs, and comprehensive protection circuitry in a 32-pin HLQFP (7x7mm) surface-mount package.

Especificaciones

  • Architecture: Class-D
  • Output Power: 40W into 8Ω @ 25V supply
  • Supply Voltage: 10V ~ 26V
  • Minimum Load: 4Ω
  • Efficiency: ~92% (eliminates heat sink)
  • THD+N: 0.2% at 1 kHz
  • SNR: 102 dB
  • PSRR: 70 dB
  • Gain Settings: 20, 26, 32, 36 dB (pin-selectable)
  • Quiescent Current: 14 mA typical @ 24V
  • Shutdown Current: 250 µA max
  • Mute Current: 9 mA max
  • Output RDS(on): 400 mΩ total (high+low side)
  • Oscillator Frequency: 200-300 kHz
  • Protection: Thermal, short-circuit (auto-recovery)
  • Clock Output: For multi-device synchronization
  • Operating Temperature: -40°C ~ 85°C
  • Package: HLQFP-32 (7x7mm) with exposed pad

Características

  • 40W output into 8Ω from 25V supply without heat sink
  • 92% efficiency eliminates thermal management complexity
  • Four pin-selectable gain settings
  • Differential inputs for noise rejection
  • Thermal and short-circuit protection with auto-recovery
  • Master/slave synchronization for multi-channel systems
  • Mute and shutdown modes for power management
  • FAULT output for fault monitoring

Aplicaciones

  • Television audio systems
  • Powered speakers and sound bars
  • Public address systems
  • Musical instrument amplifiers
  • Industrial audio alert systems

The TPA3106D1VFPR from Texas Instruments is a high-efficiency Class-D audio power amplifier capable of delivering 40W into an 8Ω speaker from a 25V supply. The approximately 92% efficiency of the Class-D architecture eliminates the need for external heat sinks, significantly reducing system size, weight, and cost compared to Class-AB alternatives. The four selectable gain settings (20, 26, 32, 36 dB) are controlled by two logic pins, allowing system designers to optimize the gain structure without external resistor networks. Differential inputs reject common-mode noise from long audio input traces. The built-in thermal shutdown and short-circuit protection with automatic recovery ensure robust operation in the field. The VFPR suffix indicates the 32-pin HLQFP package with exposed thermal pad in tape and reel format.

The TPA3106D1VFPR uses a closed-loop Class-D PWM architecture. The input audio signal is compared against a high-frequency triangle wave (200-300 kHz) to generate a pulse-width modulated signal. This PWM signal drives the output H-bridge consisting of two pairs of N-channel and P-channel MOSFETs (RDS(on) total = 400 mΩ) in a bridge-tied-load (BTL) configuration. The BTL output doubles the voltage swing across the speaker compared to single-ended output, delivering 4x the power for the same supply voltage. An external LC low-pass filter reconstructs the audio signal from the PWM output. The closed-loop architecture feeds the output back to the input comparator, reducing distortion and improving PSRR. The master/slave synchronization feature aligns the oscillator phases of multiple TPA3106D1 devices to prevent audible beat frequencies in multi-channel systems.

Grupo Pin Nombre Función
Analógico IN+, IN- Differential audio input
Analógico BYPASS Internal reference voltage bypass (1µF cap)
Controlar GAIN0, GAIN1 Gain select pins (20/26/32/36 dB)
Controlar MUTE Mute control (active high)
Controlar SHUTDOWN Shutdown control (active low)
Controlar MSTR/SLV Master/slave mode select
Controlar SYNC Clock sync input/output
Salida OUT+, OUT- BTL speaker outputs
Status FALLO Fault indicator output
Potencia VCC, AGND, PGND Power supply and grounds

The TPA3106D1VFPR is primarily designed for television audio where the 40W output power and heat-sink-free operation reduce BOM cost and enclosure size. In powered speaker applications, the BTL output directly drives 4-8Ω speakers without a coupling capacitor. For multi-channel sound bar designs, the master/slave synchronization prevents inter-channel interference from asynchronous switching. The comprehensive protection features (thermal shutdown, short-circuit with auto-recovery, FAULT output) ensure reliable operation in consumer equipment where users may accidentally short speaker terminals. The four gain settings accommodate different audio source levels without external circuitry.

Modelo Fabricante Diferencia clave
TPA3110D2 Texas Instruments Stereo 2x15W, 8-26V, more flexible
TPA3125D2 Texas Instruments Stereo 2x25W, similar architecture
STA540 STMicroelectronics 4x25W Class-AB, simpler filter
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