LM4781TA Datasheet

IC型號(hào)：
LM4781TA
PDF描述：
Overture⑩ Audio Power Amplifier Series 3 Channel 35W Audio ...
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LM4781 Overture

鈩?/div>

Audio Power Amplifier Series

3 Channel 35W Audio Power Amplifier with Mute

August 2003

LM4781

Overture

鈩?/div>

Audio Power Amplifier Series

3 Channel 35W Audio Power Amplifier with Mute

General Description

The LM4781 is a three channel audio amplifier capable of

typically delivering 35W per channel of continuous average

output power into an 8鈩?load with less than 0.5% THD+N

from 20Hz - 20kHz.

The LM4781 is fully protected utilizing National鈥檚 Self Peak

Instantaneous Temperature (藲Ke) (SPiKe

) protection cir-

cuitry. SPiKe provides a dynamically optimized Safe Operat-

ing Area (SOA). SPiKe protection completely safeguards the

LM4781鈥檚 outputs against over-voltage, under-voltage, over-

loads, shorts to the supplies or GND, thermal runaway and

instantaneous temperature peaks. The advanced protection

features of the LM4781 places it in a class above discrete

and hybrid amplifiers.

Each amplifier of the LM4781 has an independent smooth

transition fade-in/out mute.

The LM4781 can easily be configured for bridge or parallel

operation for higher power and bi-amp solutions.

Key Specifications

Output Power/Channel with 0.5% THD+N,

1kHz into 8鈩?/div>

35W (typ)

THD+N at 3 x 20W into 8鈩?(20Hz - 20kHz) 0.2% (typ)

THD+N at 3 x 20W into 6鈩?(20Hz - 20kHz) 0.3% (typ)

THD+N at 3 x 20W into 4鈩?(20Hz - 20kHz) 0.5% (typ)

Mute Attenuation

PSRR

Slew Rate

110dB (typ)

85dB (min)

9V/碌s (typ)

Features

SPiKe Protection

Low external component count

Quiet fade-in/out mute mode

Wide supply range: 20V - 70V

Signal-to-Noise Ratio

鈮?/div>

93dB (ref. to P

= 1W)

Applications

Audio

amplifier

for

component stereo

compact stereo

self-powered speakers

high-end and HD TVs

Typical Application

200673B5

FIGURE 1. Typical Audio Amplifier Application Circuit

SPiKe

鈩?/div>

Protection and

Overture

鈩?/div>

are trademarks of National Semiconductor Corporation.

漏 2003 National Semiconductor Corporation

DS200673

www.national.com

制造商
National Semiconductor (TI)
產(chǎn)品
Class-AB
輸出功率
35 W x 3 at 8 Ohms
輸出類型
3-Channel Stereo
可用增益調(diào)整
115 dB
共模抑制比（最小值）
75 dB
THD + 噪聲
0.2 %
工作電源電壓
18 V
最大功率耗散
125000 mW
最大工作溫度
+ 85 C
安裝風(fēng)格
Through Hole
封裝 / 箱體
TO-220
封裝
Tube
音頻負(fù)載電阻
8 Ohms
雙重電源電壓
+/- 12 V, +/- 15 V, +/- 18 V, +/- 24 V, +/- 28 V
輸入補(bǔ)償電壓
10 mV at +/- 28 V
輸入信號(hào)類型
Differential
最小工作溫度
- 20 C
輸出信號(hào)類型
Single
電源類型
Single, Dual
Supply Voltage - Max
70 V
Supply Voltage - Min
20 V

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