LM4675
- Spread Spectrum Architecture Reduces EMI
- Mono Class D Operation
- No Output Filter Required for Inductive Loads
- Externally Configurable Gain
- Very Fast Turn On Time: 17μs (typ)
- Minimum External Components
- "Click and Pop" Suppression Circuitry
- Micro-Power Shutdown Mode
- Available in Space-Saving 0.5mm Pitch DSBGA and WSON Packages
Key Specifications
- Efficiency at 3.6V, 400mW into 8Ω Speaker: 89% (typ)
- Efficiency at 3.6V, 100mW into 8Ω Speaker: 80% (typ)
- Efficiency at 5V, 1W into 8Ω Speaker: 89% (typ)
- Quiescent Current, 3.6V Supply: 2.2mA (typ)
- Total Shutdown Power Supply Current: 0.01µA (typ)
- Single Supply Range: 2.4V to 5.5V
- PSRR, f = 217Hz: 82dB
All trademarks are the property of their respective owners.
The LM4675 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A spread spectrum, filterless PWM architecture reduces EMI and eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.
The LM4675 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.2W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The wide band spread spectrum architecture of the LM4675 reduces EMI-radiated emissions due to the modulator frequency.
The LM4675 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8Ω speaker, the IC's efficiency for a 100mW power level is 80%, reaching 89% at 400mW output power.
The LM4675 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND).
The gain of the LM4675 is externally configurable which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions.
技術資料
| 種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
|---|---|---|---|---|---|---|
| * | データシート | Ultra-Low EMI, Fltrles, 2.65W, Mono, ClassD Audio Pwr Amp w/Sprd Spectrum データシート (Rev. C) | 2013年 5月 1日 | |||
| アプリケーション・ノート | Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) | 2019年 8月 26日 | ||||
| アプリケーション・ノート | AN-1849 An Audio Amplifier Power Supply Design (Rev. C) | 2019年 6月 27日 | ||||
| アプリケーション・ノート | AN-1737 Managing EMI in Class D Audio Applications (Rev. A) | 2013年 5月 1日 |
設計と開発
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LM4675SDBD — 超低 EMI、フィルタ不要、2.65W、モノ、Class-D オーディオ・パワー・アンプ（LLP-8）
The LM4675 is a class D filterless BOOMER audio amplifier with ultra low EMI. National's new spread spectrum technology has been integrated with the latest BOOMER performance characteristics in a 0.5mm pitch, micro SMD package. The LM4675 is designed for high output, low EMI and space saving (...)
LM4675TLBD — 超低 EMI、フィルタなし、2.65W、モノ、Class-D オーディオ・パワー・アンプ（Micro SMD-9）
The LM4675 is a class D filterless BOOMER audio amplifier with ultra low EMI. National's new spread spectrum technology has been integrated with the latest BOOMER performance characteristics in a 0.5mm pitch, micro SMD package. The LM4675 is designed for high output, low EMI and space saving (...)
PSPICE-FOR-TI — TI Design / シミュレーション・ツール向け PSpice®
設計とシミュレーション向けの環境である PSpice for TI (...)
| パッケージ | ピン数 | ダウンロード |
|---|---|---|
| DSBGA (YZR) | 9 | オプションの表示 |
| WSON (NGQ) | 8 | オプションの表示 |
購入と品質
- RoHS
- REACH
- デバイスのマーキング
- リード端子の仕上げ / ボールの原材料
- MSL 定格 / ピーク リフロー
- MTBF/FIT 推定値
- 材質成分
- 認定試験結果
- 継続的な信頼性モニタ試験結果
- ファブの拠点
- 組み立てを実施した拠点
推奨製品には、この TI 製品に関連するパラメータ、評価基板、またはリファレンス デザインが存在する可能性があります。