TPA311DGN - 350mW Mono Class-AB Audio Amplifier | Texas Instruments
MPN: TPA311DGN ✓ Hoạt độngTPA311DGN Tóm tắt
An audio power amplifier is an integrated circuit that increases the voltage and current capability of an audio signal so it can drive a speaker or other low-impedance transducer. A BTL arrangement uses both output terminals to drive the speaker differentially, which increases voltage swing and can reduce the need for an output coupling capacitor. A Class-AB output stage provides continuous conduction with lower crossover distortion than a typical Class-D architecture, making the TPA311 useful for small speakers, internal speakers, and portable audio products.
Key features include mono operation, a 350 mW output-power rating, Class-AB operation, BTL and single-ended modes, shutdown support with speaker-noise reduction, and an 8-pin HVSSOP package. The product information identifies the amplifier as a 3.3 V, 8 ohm audio solution with approximately 1.4 MHz switching or operating frequency information shown by a distributor listing; the exact interpretation of that frequency should be confirmed against the manufacturer datasheet for the specific design configuration.
The TPA311 is appropriate for portable media players, compact speakers, personal audio products, and low-voltage embedded systems where a mono speaker is sufficient. In a typical implementation, the audio source drives the amplifier input through the device's gain-setting network, while the BTL output connects directly across the speaker. The single-ended output option can support headphone-style or externally terminated loads, subject to the datasheet's output and load restrictions.
Designers should pay close attention to supply decoupling, speaker impedance, thermal performance of the exposed pad, and the distinction between BTL and single-ended wiring. The HVSSOP package improves board-space efficiency compared with the larger 8-pin SOIC option, while the PowerPAD provides a thermal connection to the PCB copper area. Application details, limit values, gain options, and recommended external components must be taken from the manufacturer datasheet rather than inferred from distributor summaries.
Bộ thay thế dễ dàng lắp đặt cho TPA311DGN — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với TPA311DGN (cùng hình factor và footprint) — khác nhau ở Output Configuration, Product Type, Package, Maximum Output Power.
TPA301DGN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TPA321DGN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TPA701DGNR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TPA311DGN Tỷ lệ tối đa & tính chất điện
| Product Type | Mono audio power amplifier |
| Amplifier Class | Class AB |
| Rated Output Power | 350 mW |
| Continuous Output Power | 250 mW into 8 ohms at 3.3 V supply |
| Điện áp cung cấp | 3.3 V |
| Cấu hình đầu ra | Bridge-tied load (BTL) or single-ended |
| Load Impedance | 8 ohms |
| Distortion | Less than 1% THD+N under the stated 3.3 V, 8 ohm, 250 mW condition |
| Channel Count | 1 channel (mono) |
| Shutdown Function | Yes, with speaker-noise reduction during shutdown and power cycling |
| Frequency | Approximately 1.4 MHz, as listed in a distributor product summary |
| Hộp | 8-pin HVSSOP (DGN) |
| Kiểu lắp đặt | Surface mount |
| Thermal Construction | PowerPAD surface-mount package |
Cấu hình chân TPA311DGN
| Chân 1 | NC — Not connected (per datasheet) |
| Chân 2 | GAIN — Gain setting input |
| Chân 3 | IN+ — Noninverting audio input |
| Chân 4 | IN- — Inverting audio input |
| Chân 5 | NC — Not connected (per datasheet) |
| Chân 6 | GND — Ground |
| Chân 7 | OUT+ — Positive BTL or single-ended output |
| Chân 8 | OUT- — Negative BTL or single-ended output |
Ứng dụng tiêu biểu
TPA311DGN phù hợp cho 6 Áp dụngs: Portable Mono Speaker, Bluetooth Speaker, Personal Audio Device, Compact Industrial Annunciator, USB Audio Accessory, Smart Home Audio Node.
Portable Mono Speaker
The TPA311DGN fits portable mono-speaker designs because it provides a documented 350 mW device rating and up to 250 mW continuous output into an 8 ohm BTL load at 3.3 V. In a typical portable audio product, an audio codec or Bluetooth receiver drives the amplifier inputs, while the differential BTL outputs connect directly to the speaker. This arrangement increases effective output swing and can reduce the need for a series output capacitor. The designer must confirm speaker impedance, supply droop, thermal rise, and the allowed distortion condition in the manufacturer datasheet.
Được đề xuất
Bluetooth Speaker
For a compact Bluetooth speaker, the TPA311DGN can provide the final Class-AB power stage after a Bluetooth audio codec. Its 3.3 V operating point is aligned with portable battery-powered equipment, while the 8-pin HVSSOP DGN package preserves board area compared with a larger SOIC. Use the BTL outputs for the internal speaker and place local decoupling close to the supply pins. The amplifier's 250 mW continuous-power result into 8 ohms provides a clear sizing reference, but battery current, acoustic output, and thermal performance must be evaluated together.
Được đề xuất
Personal Audio Device
The TPA311DGN can serve as a mono speaker amplifier in personal-audio and wearable-adjacent products where the available supply is approximately 3.3 V. Its Class-AB topology avoids the need to describe it as a switching amplifier, while the single-ended mode offers an additional circuit option for lower-impedance or externally terminated loads. BTL wiring is generally preferred for a speaker because both outputs contribute to differential voltage swing. Before selecting it for a headphone jack, verify output-current limits, DC offset, shutdown behavior, and the manufacturer's recommended output network.
Được đề xuất
Compact Industrial Annunciator
A low-cost industrial annunciator or local audible indicator can use the TPA311DGN when the system operates from 3.3 V and drives a small 8 ohm transducer. The amplifier's documented 350 mW rating and 250 mW continuous output condition provide a starting point for speaker selection, while the surface-mount DGN package is useful in dense control electronics. Industrial suitability still depends on environmental requirements such as temperature range, ESD immunity, and electromagnetic performance, none of which are quantified in the supplied verified data and therefore must be checked in the datasheet.
Được đề xuất
USB Audio Accessory
The TPA311DGN is suitable for a small USB-powered audio accessory that requires a mono Class-AB output stage. A USB audio interface or codec can feed the amplifier, and the DGN package allows the amplifier to be placed close to the output connector and speaker. The 3.3 V supply architecture keeps the design compatible with low-voltage USB-powered systems, although the actual available current from the USB source must be measured under worst-case conditions. Add adequate local bypass capacitance and follow the manufacturer layout guidance to minimize supply ripple and output noise.
Được đề xuất
Smart Home Audio Node
A smart-home audio node can use the TPA311DGN to drive a local speaker from a low-voltage digital audio source. The 3.3 V Class-AB amplifier is appropriate where a small speaker and compact PCB are required, and the 8-pin HVSSOP DGN footprint simplifies integration beside an audio codec or wireless module. Shutdown support with reduced speaker noise is useful when the node is idle or power-cycled. The implementation should preserve the device's recommended grounding and decoupling arrangement and verify the enclosure's thermal conditions because the exposed PowerPAD needs adequate PCB copper.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TPA311DGN — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | TPA301DGN | TPA321DGN | TPA701DGNR |
|---|---|---|---|---|
| Package | HVSSOP-8 (DGN) | HVSSOP-8 (DGN) | HVSSOP-8 (DGN) | HVSSOP-8 (DGN) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Bảo phân biệt quan trọng
- Verified 350 mW device rating (vsTPA321DGN)
- BTL and single-ended output flexibility (vsTPA321DGN)
- Shutdown with reduced speaker noise (vsTPA301DGN)
Ghi chú thiết kế
Decouple the amplifier supply with the capacitance and placement specified by the manufacturer datasheet. Keep the input, output, and ground paths short, and connect the exposed PowerPAD to a properly sized ground-copper region. In a BTL configuration, both output terminals drive the speaker differentially; do not connect either output to ground because doing so can damage the amplifier and create unsafe acoustic behavior.
Estimated thermal design must begin with the actual dissipation, calculated from supply voltage, output voltage, load current, and output power under the worst operating condition. Use the manufacturer thermal characterization data for the DGN package and PCB copper area rather than treating the package as an unlimited heat sink. Increase copper coverage, improve airflow, or reduce output power if the calculated junction-temperature margin is inadequate.
Do not assume that every similarly named DGN amplifier is pin-compatible. Verify input polarity, gain-control implementation, shutdown polarity, exposed-pad connection, and BTL output assignments against the manufacturer pin table. Also verify that the speaker impedance, supply voltage, gain, and output power are within the device limits; a matched package alone does not establish electrical drop-in compatibility.
Place the input components and gain network close to the amplifier input pins to minimize pickup and feedback from the high-current speaker outputs. Keep the BTL speaker traces physically short and away from sensitive audio inputs. Use a continuous ground reference beneath and around the device, and follow the datasheet's recommended PCB layout and thermal-pad connection instructions for stable noise and distortion performance.
Thông tin tuân thủ
The supplied verified web data does not state the requested compliance or environmental classifications. These fields remain unknown rather than being inferred from the manufacturer or distributor listings.
