Datasheet > LM48312TLE

LM48312TLE

更新时间： 2024-01-22 09:59:39

品牌	Logo	应用领域
美国国家半导体 - NSC		商用集成电路放大器功率放大器
页数	文件大小	规格书
20页	929K
描述
2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Power Amplifier with E2S

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LM48312TLE 数据手册

May 13, 2010

LM48312ꢀ

2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Power

Amplifier with E²S

General Description

Key Specifications

The LM48312 is a single supply, high efficiency, mono, 2.6W,

filterless switching audio amplifier. The LM48312 features

National’s Enhanced Emissions Suppression (E²S) system,

that features a unique patented ultra low EMI, spread spec-

trum, PWM architecture, that significantly reduces RF emis-

sions while preserving audio quality and efficiency. The E²S

system improves battery life, reduces external component

count, board area consumption, and system cost, simplifying

design.

■ꢀEfficiency at 3.6V, 400mW into 8Ω

■ꢀEfficiency at 5V, 1W into 8Ω

■ꢀQuiescent Power Supply Current at 5V

84% (typ)

88% (typ)

3.1mA

■ꢀPower Output at V_DD= 5V, R_L= 4Ω

THD+N ≤ 10%

2.6W (typ)

2.1W (typ)

THD+N ≤ 1%

■ꢀPower Output at V_DD= 5V, R_L= 8Ω

THD+N ≤ 10%

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 main-

taining high quality audio reproduction (THD+N = 0.03%) and

high efficiency (η = 88%).

The LM48312 features high efficiency compared to conven-

tional Class AB amplifiers, and other low EMI Class D ampli-

fiers. When driving an 8Ω speaker from a 5V supply, the

device operates with 88% efficiency at P_O= 1W. The

LM48312 features five gain settings, selected through a sin-

gle logic input, further reducing solution size. A low power

shutdown mode reduces supply current consumption to

0.01µA.

1.6W (typ)

1.3W (typ)

THD+N ≤ 1%

0.01μA (typ)

■ꢀShutdown current

Features

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

Advanced output short circuit protection with auto-recovery

prevents the device from being damaged during fault condi-

tions. Superior click and pop suppression eliminates audible

transients on power-up/down and during shutdown.

Click and Pop suppression

Available in space-saving microSMD package

Applications

Mobile phones

■

PDAs

Laptops

Boomer® is a registered trademark of National Semiconductor Corporation.

301107

www.national.com

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LM48312TLE/NOPB	TI	Boomer Audio Power Amplifier Series 2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Po	获取价格
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