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.<\/p>\n
Product Overview 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. Key […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[138],"class_list":["post-6515","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"40W mono Class-D audio amp, 10-26V, 92% efficiency, 4 gain settings, HLQFP-32 7x7mm","date_code":"","package_case":"HLQFP-32 (7x7mm) with exposed pad","in_stock":2100,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tpa3106d1.pdf","price":"$2.74","product_introduction":"The TPA3106D1VFPR from Texas Instruments is a high-efficiency Class-D audio power amplifier capable of delivering 40W into an 8\u03a9 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.","working_principle":"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 m\u03a9) 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.","pin_description":"
| Pin Group<\/th> | Name<\/th> | Function<\/th><\/tr> | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analog<\/td> | IN+, IN-<\/td> | Differential audio input<\/td><\/tr> | ||||||||||||
| Analog<\/td> | BYPASS<\/td> | Internal reference voltage bypass (1\u00b5F cap)<\/td><\/tr> | ||||||||||||
| Control<\/td> | GAIN0, GAIN1<\/td> | Gain select pins (20\/26\/32\/36 dB)<\/td><\/tr> | ||||||||||||
| Control<\/td> | MUTE<\/td> | Mute control (active high)<\/td><\/tr> | ||||||||||||
| Control<\/td> | SHUTDOWN<\/td> | Shutdown control (active low)<\/td><\/tr> | ||||||||||||
| Control<\/td> | MSTR\/SLV<\/td> | Master\/slave mode select<\/td><\/tr> | ||||||||||||
| Control<\/td> | SYNC<\/td> | Clock sync input\/output<\/td><\/tr> | ||||||||||||
| Output<\/td> | OUT+, OUT-<\/td> | BTL speaker outputs<\/td><\/tr> | ||||||||||||
| Status<\/td> | FAULT<\/td> | Fault indicator output<\/td><\/tr> | ||||||||||||
| Power<\/td> | VCC, AGND, PGND<\/td> | Power supply and grounds<\/td><\/tr><\/table>","application_scenarios":"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 4-8\u03a9 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.","alternative_models":"
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