TDA7297


双桥 AB 类音频放大器,15W+15W @ 8 欧姆,6-18V,固定 32dB 增益,静音/待机,Multiwatt-15,0~70C

2840

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制造商零件:

TDA7297

包装:

Multiwatt-15(垂直、弯曲和交错引线)(20.95 x 24.9 毫米)

品牌:
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说明

意法半导体的 TDA7297 是一款双桥(立体声)AB 类音频放大器,采用 15 引脚 Multiwatt 封装,在 16.5V 电源电压下为 8 欧姆负载提供高达 15W + 15W 的输出。工作电源电压范围6V 至 18V(指定电压为 6.5V 至 18V)。该器件具有 32dB 的内部固定增益,无需外部增益设置电阻。无需 SVR(电源电压抑制)电容器、自举电容器和布歇洛特单元,从而最大限度地减少了外部元件数量。内置静音和待机功能可实现微处理器控制操作和无爆音接通。集成了短路和热过载保护功能。静态电流:典型值为 50mA。输出峰值电流:2A(内部限制)。最大功率耗散:Tcase=70C 时为 33W。电源抑制典型值:56dB。对于 4 欧姆负载,电源电压不应超过 14V,以限制失真和功率耗散。工作温度0C 至 70C。通孔 Multiwatt-15 封装,引线弯曲交错。有源产品,符合 RoHS 规范。.

意法半导体的 TDA7297 是一款双桥(立体声)AB 类音频功率放大器,主要设计用于电视和便携式无线电应用。它采用 15 引脚多瓦特通孔封装,在 16.5V 电源供电时,8 欧姆负载的每通道输出功率可达 15 瓦;在 14.4V 电源供电时,4 欧姆负载的每通道输出功率可达 15 瓦。.

该器件的特点是对外部元件的要求极低。与许多音频功率放大器不同,TDA7297 不需要 SVR(电源电压抑制)电容器、自启动电容器,也不需要用于稳定的 Boucherot 单元(佐贝尔网络)。增益内部固定为 32dB(约 40 倍电压增益),无需外部增益设置电阻。这使得 TDA7297 成为最简单的音频放大器集成电路之一,非常适合成本敏感型消费电子产品。.

与单端输出相比,BTL(桥接负载)输出配置可将扬声器两端的电压摆幅增加一倍,从而实现单电源电压的更高输出功率,而无需耦合电容器或分路供电。每个通道使用推挽式 H 桥配置的两个输出级,扬声器连接在两个输出(OUT+ 和 OUT-)之间。.

静音和待机功能提供与微处理器兼容的放大器状态控制。待机功能通过关闭输出级来降低功耗,同时保持偏置电路的活力以实现快速恢复。静音功能可在不进入待机状态的情况下使输出静音。这两种功能既可独立控制,也可绑定在一起进行简单的开/关操作。静音/待机引脚上建议使用 RC 网络,通过延迟静音的释放时间,直到内部电路稳定下来,从而实现无爆音接通。.

TDA7297 具有全面的保护功能:短路保护(输出和接地之间),内部限制 2A 的峰值输出电流;热关断,结温超过约 150C 时启动。从结点到外壳的热阻(Rth j-case)通常为 1.4C/W(最大为 2C/W),因此大多数应用都需要适当的散热器。.

对于 8 欧姆负载,建议使用 12V 至 16.5V 的电源电压,其中 16.5V 可提供最大输出功率。对于 4 欧姆负载,电源电压最大应限制在 14V,以防止功率耗散和失真过大。静态电流典型值为 50mA,使该器件成为相对高效的 AB 类放大器。.

该器件将电源接地(PW-GND,引脚 8)与信号接地(S-GND,引脚 9)分开,允许正确的星形接地,以最大限度地减少接地回路噪声。信号输入端(IN1 和 IN2)以 S-GND 为基准,而输出级和电源引脚则以 PW-GND 为基准。.

TDA7297 作为双通道 AB 类桥接负载 (BTL) 音频功率放大器运行,具有内部固定增益。.

AB 类输出级每个通道均采用 AB 类推挽输出级,其中 NPN 和 PNP(或 N 沟道和 P 沟道)输出晶体管均有偏置,以便在空闲时轻微导通,从而消除了纯 B 类设计所特有的交叉失真。较小的静态偏置电流(占 50mA 总静态电流的一部分)确保了输出波形的推挽两半之间的平滑过渡。因此,AB 类工作具有预期的低失真(在中等功率水平下,总谐波失真通常不超过 0.1%)。.

桥接负载 (BTL) 配置:每个通道使用两个 H 桥配置的输出放大器。输入信号馈送至一个放大器的非反相输入端(驱动 OUT+),同时馈送至第二个放大器的反相输入端(驱动 OUT-)。扬声器连接在 OUT+ 和 OUT- 之间,没有接地参考。与单端输出相比,这种 BTL 配置可将扬声器上的有效电压增加一倍:Vspeaker = 2 x Vsingle-ended。由于功率与 V 平方成正比,因此在相同电源电压下,BTL 配置的输出功率是单端放大器的四倍(理论上是这样;实际上,电流限制和电源下陷会将输出功率降低到大约 3 倍)。.

BTL 配置还无需使用大型输出耦合电容器,因为扬声器两端的直流偏移标称为零(两路输出均为 VCC/2)。在对尺寸和成本有严格要求的电视和便携式音频应用中,这是一个显著的优势。.

内部固定增益:电压增益通过内部反馈电阻设定为 32dB(约 40 倍)。这简化了外部电路,但意味着增益无法调整。32dB 增益意味着 500mV RMS 输入信号可产生 20V RMS 输出,这将超过电源电压。实际上,最大输出受到电源电压和负载阻抗的限制。对于 8 欧姆 16.5V 电源,最大输出功率约为 15W,相当于扬声器两端约 11V RMS,在 32dB 增益下需要约 275mV RMS 输入。.

静音功能:当静音引脚(引脚 6)被拉至低电平(低于约 2V)时,输出级处于静音状态 - 输出晶体管关闭,输出呈现高阻抗。当 MUTE 为高电平(约 3.5V 以上)时,放大器正常工作。静音功能提供了一种无需断开电源即可实现输出静音的简便方法。.

待机功能:当 STANDBY 引脚(引脚 7)拉低时,整个放大器进入低功耗待机状态,将静态电流降至几毫安。当 STANDBY 为高电平时,放大器完全工作。待机状态会禁用偏置电路和输出级,但内部基准和保护电路仍处于激活状态,以便快速恢复。.

无爆音开启:为实现无爆音操作,静音和待机引脚通常连接在一起,并通过一个 RC 网络驱动。开机期间,电容器缓慢充电,使放大器保持待机+静音状态,直至电源电压稳定。一旦电容器电压超过待机阈值,偏置电路就会启动。一旦超过静音阈值,输出将解除静音。这种排序(待机先于静音释放)可确保放大器在启用输出之前完全偏置,从而防止接通瞬态(爆音)到达扬声器。.

保护电路:短路保护将峰值输出电流限制在大约 2 安培。如果输出电流超过这一限制(例如,由于扬声器电线短路),输出级将降低驱动力,以将电流保持在或低于限制。热保护功能可监控结温,如果温度超过约 150 摄氏度,则会关闭输出级,防止造成永久性损坏。当温度降至阈值以下时,放大器会自动恢复。.

针脚 名称 类型 说明
1 OUT1+ 输出 通道 1 非反相桥式输出;连接至扬声器 1 正极;BTL 输出从接近 GND 到接近 VCC 之间摆动
2 OUT1- 输出 通道 1 反相桥输出;连接至扬声器 1 负极;与 OUT1+ 反相
3 VCC 电源 通道 1 电源电压;6V 至 18V;用 470uF 电解 + 100nF 陶瓷电容器与 PW-GND 去耦
4 IN1 输入 通道 1 音频输入;通过 0.22uF 电容器的交流耦合;参考 S-GND;内部偏置至 VCC/2;32dB 固定增益
5 北卡罗来纳州. - 无内部连接;保持浮动
6 静音 输入 静音控制;低电平 = 输出静音(高阻抗);高电平 = 正常工作;阈值约为低电平 2V / 高电平 3.5V;使用 RC 网络进行无爆音控制
7 待机 输入 待机控制;低电平 = 待机(低功耗);高电平 = 正常工作;阈值与 MUTE 相似;通常与 MUTE 引脚绑定并带有 RC 延迟
8 PW-GND 电源 电源接地;输出级的大电流返回路径;通过厚 PCB 线迹连接至电源接地;与 S-GND 分开
9 S-GND 电源 信号接地;输入信号和偏置电路的低电流基准;以单点(星形接地)连接至 PW-GND,以尽量减少接地环路噪声
10 北卡罗来纳州. - 无内部连接;保持浮动
11 北卡罗来纳州. - 无内部连接;保持浮动
12 IN2 输入 通道 2 音频输入;通过 0.22uF 电容器的交流耦合;参考 S-GND;内部偏置至 VCC/2;32dB 固定增益
13 VCC 电源 通道 2 电源电压;6V 至 18V;用 470uF 电解 + 100nF 陶瓷电容器与 PW-GND 去耦
14 OUT2- 输出 通道 2 反相桥输出;连接至扬声器 2 负极;与 OUT2+ 反相
15 OUT2+ 输出 通道 2 非反相桥式输出;连接至扬声器 2 正极;BTL 输出从接近 GND 到接近 VCC 之间摆动
应用 说明
电视音频 主要应用;双 15W 通道直接驱动左右两个电视扬声器;可从电视电源获得 12V-16V 电源;静音/待机由电视微控制器控制;外部元件最少,可降低成本
便携式无线电/微型系统 用于便携式 CD/收音机组合的紧凑型立体声放大器;6V-15V 电池或适配器供电;外部元件数量少,适合较小的 PCB 面积;BTL 输出无需耦合电容器
桌面供电扬声器 用于多媒体扬声器的高性价比立体声放大器;12V-15V 壁式适配器供电;每声道 15W 的功率足以满足近场聆听的需要;无自举式或 SVR 电容器,简化了 PCB 布局
DIY 音频项目 由于结构简单,仅需电源、输入耦合电容器和扬声器连接,因此成为业余爱好者音频放大器的热门选择;通孔式多瓦封装易于手工焊接;供应广泛且成本低廉
工业音频报时 用于警报、广播和背景音乐的 PA 系统放大器;静音/待机功能可让系统控制器管理音频输出;热保护和短路保护功能可确保始终在线安装的可靠性
模型 制造商 兼容性 主要区别
TDA7266 ST 功能相似,功率较低 7W+7W 输入 8 欧姆(功率减半);相同的 Multiwatt-15 封装;更低的电源电流;可接受更低功率时使用;更低的成本
TDA7266B ST 功能相似 与 TDA7266 相似,但增益选项不同;7W+7W;有关具体功能差异,请查阅数据表
TDA7377 ST 功能相似 四桥或立体声 + 桥-三桥配置;更灵活的拓扑结构;类似的功率输出;Flexiwatt-25 封装;不同的引脚输出
TDA7294V ST 更高功率替代方案 100 瓦单声道 AB 类放大器;DMOS 输出级;功率更大;应用领域不同;Multiwatt-15 垂直封装;需要更多外部元件
PAM8403 二极管公司 D 类备选方案 3W+3W D 类放大器;效率更高(>90%);无需散热片;5V 电源;功率更低但体积更小的解决方案;DIP-16 或 SOP-16 封装
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质量保证

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

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We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

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Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

Online Inquiry Form

Support Excel, PDF, CSV format files for full BOM list quotation

Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.