LM48312
- Passes FCC Class B Radiated Emissions with 20 Inches of Cable
- E2S System Reduces EMI While Preserving Audio Quality and Efficiency
- Output Short Circuit Protection with Auto-Recovery
- No Output Filter Required
- Improved Audio Quality
- Minimum External Components
- Five Logic Selectable Gain Settings (0, 3, 6, 9, 12dB)
- Low Power Shutdown Mode
- Click and Pop Suppression
- Available in Space-Saving DSBGA Package
Key Specifications
- Efficiency at 3.6V, 400mW into 8Ω, 84% (Typ)
- Efficiency at 5V, 1W into 8Ω, 88% (Typ)
- Quiescent Power Supply Current at 5V, 3.1mA
- Power Output at VDD =
5V, RL = 4Ω
- THD+N ≤ 10%, 2.6W (Typ)
- THD+N ≤ 1%, 2.1W (Typ)
- Power
Output at VDD = 5V, RL =
8Ω
- THD+N ≤ 10%, 1.6W (Typ)
- THD+N ≤ 1%, 1.3W (Typ)
- Shutdown Current, 0.01μA (Typ)
Boomer is a trademark of Texas Instruments. All trademarks are the property of their respective owners.
The LM48312 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48312 features TI’s Enhanced Emissions Suppression (E2S) system, that features a unique patented ultra low EMI, spread spectrum, PWM architecture, that significantly reduces RF emissions while preserving audio quality and efficiency. The E2S system improves battery life, reduces external component count, board area consumption, and system cost, simplifying design.
The LM48312 is designed to meet the demands of portable multimedia devices. Operating from a single 5V supply, the device is capable of delivering 2.6W of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48312 features both a spread spectrum modulation scheme, and an advanced, patented edge rate control (ERC) architecture that significantly reduces emissions, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency (η = 88%).
The LM48312 features high efficiency compared to conventional Class AB amplifiers, and other low EMI Class D amplifiers. When driving an 8Ω speaker from a 5V supply, the device operates with 88% efficiency at PO = 1W. The LM48312 features five gain settings, selected through a single logic input, further reducing solution size. A low power shutdown mode reduces supply current consumption to 0.01µA.
Advanced output short circuit protection with auto-recovery prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LM48312 2.6W, Ultra-Low EMI, Filterless, MonoClass D Audio Pwr Amplifr w/ E2S datasheet (Rev. D) | 2013. 5. 1 | ||
| 애플리케이션 노트 | Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) | 2019. 8. 26 | |||
| 애플리케이션 노트 | AN-1849 An Audio Amplifier Power Supply Design (Rev. C) | 2019. 6. 27 | |||
| 애플리케이션 노트 | AN-1737 Managing EMI in Class D Audio Applications (Rev. A) | 2013. 5. 1 |
설계 및 개발
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| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YZR) | 9 | Ultra Librarian |