LM48511
- 3-W Output into 8 Ω at 5 V With THD+N = 1%
- Selectable spread spectrum mode reduces EMI
- 80% Efficiency
- Independent regulator and amplifier shutdown controls
- Dynamically Selectable Regulator Output Voltages
- Filterless Class D
- 3-V to 5.5-V Operation
- Low shutdown current
- Click and pop suppression
- Key specifications
- Quiescent power supply current
- VDD = 3 V 9 mA (Typical)
- VDD = 5 V 13.5 mA (Typical)
- PO at VDD = 5 V, PV1 = 7.8 V, RL = 8 Ω,
THD+N = 1% 3 W (Typical) - PO at VDD = 3 V, PV1 = 4.8 V, RL = 8 Ω,
THD+N = 1% 1 W (Typical) - PO at VDD = 5 V, PV1 = 7.8 V, RL = 4 Ω,
THD+N = 1% 5.4 W (Typical) - Shutdown Current at VDD = 3 V, 0.01 µA (Typical)
- Quiescent power supply current
The LM48511 device integrates a boost converter with a high-efficiency Class D audio power amplifier to provide 3-W continuous power into an 8-Ω speaker when operating from a 5-V power supply.
When operating from a 3-V to 4-V power supply, the LM48511 can be configured to drive 1 to 2.5 W into an 8-Ω load with less than 1% distortion (THD+N). The Class D amplifier features a low-noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further reducing the need for output filters.
The switching regulator of the LM48511 is a current-mode boost converter operating at a fixed frequency of 1 MHz. Two selectable feedback networks allow the LM48511 regulator to dynamically switch between two different output voltages, improving efficiency by optimizing the amplifier’s supply voltage based on battery voltage and output power requirements.
The LM48511 is designed for use in portable devices, such as GPS, mobile phones, and MP3 players. The high, 80% efficiency at 5 V, extends battery life when compared to Boosted Class AB amplifiers. Independent regulator and amplifier shutdown controls optimize power savings by disabling the regulator when high-output power is not required.
The gain of the LM48511 is set by external resistors, 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. Superior click and pop suppression eliminates audible transients during power-up and shutdown.
기술 자료
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | LM48511 3-W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier With Spread Spectrum datasheet (Rev. K) | PDF | HTML | 2019/10/08 |
| Application note | Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) | 2019/08/26 | ||
| Application note | AN-1849 An Audio Amplifier Power Supply Design (Rev. C) | 2019/06/27 | ||
| Application note | AN-1737 Managing EMI in Class D Audio Applications (Rev. A) | 2013/05/01 | ||
| EVM User's guide | AN-1922 LM48511 Evaluation Board User's Guide (Rev. C) | 2013/05/01 | ||
| More literature | LM48511SQ Demo Board Description and Setup Instructions | 2012/01/26 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
LM48511SQBD — LM48511은 부스트 컨버터와 고효율성을 통합
This LM48511SQDB is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM48511SQ. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load.
PSPICE-FOR-TI — TI 설계 및 시뮬레이션 툴용 PSpice®
TI 설계 및 시뮬레이션 환경용 PSpice는 기본 제공 라이브러리를 이용해 복잡한 혼합 신호 설계를 시뮬레이션할 수 있습니다. 레이아웃 및 제작에 (...)
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| WQFN (NHZ) | 24 | Ultra Librarian |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.