Datasheet > ft2045N

ft2045N

更新时间： 2024-11-09 01:09:03

品牌	Logo	应用领域
FANGTEK		/
页数	文件大小	规格书
22页	1082K
描述
3W Class-D Audio Power Amplifier with Automatic Level Control

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ft2045N 数据手册

ft2045

3W Class-D Audio Power Amplifier

with Automatic Level Control

GENERAL DESCRIPTION

FEATURES

The ft2045 is a high efficiency, filterless Class-D

audio power amplifier with automatic level control

(ALC). It operates from 2.7V to 5.5V supply.

When powered with 5V supply voltage, the ft2045

is capable of delivering 3W into a 4Ω load or 1.7W

into an 8Ω load, with 10% THD+D. Other than a

simple one-wire pulse control to set the operating

mode and the ALC function, the ft2045 is pin and

functionality compatible with traditional Class-D

audio amplifiers. Note that, unlike traditional

Class-D audio amplifiers, no external bypass

capacitor for the common-mode bias of audio

inputs is required for ft2045, thus minimizing the

number of the external components (3 capacitors

only) needed for high-quality audio applications.

 Filterless Class-D operation

 Automatic level control to eliminate output

clipping

 No bypass capacitor required for the

common-mode bias of audio inputs

 High efficiency up to 90%

 Output power at 5V supply (ALC Off, ft2045M)

3.0W (4Ω load, 10% THD+N)

1.7W (8Ω load, 10% THD+N)

2.4W (4Ω load, 1% THD+N)

1.4W (8Ω load, 1% THD+N)

 Low THD+N: 0.04%

(VDD=3.6V, f=1kHz, RL=8Ω, PO=0.5W)

 Low quiescent current: 2.4mA @ VDD=3.6V

 Low shutdown current < 0.1µA

The ft2045 features ALC on the output signals,

which detects the output clipping caused by the

over-level input signal and automatically adjusts

the voltage gain of the amplifier to eliminate the

clipping while maintaining a maximally-allowed

dynamic range of the audio output signals. The

ALC also eliminates the output clipping due to low

battery supply voltage.

 High PSRR: 70dB @ 217Hz

 One-wire pulse control to configure operating

mode & gain

 Two fixed gain settings: 18/24dB



Maximum ALC attenuation: 10dB

 Short-circuit & thermal protection

 Fast startup time: 5ms

As a Class-D power amplifier, the ft2045 features

high efficiency (up to 90%) and high PSRR (70dB

at 217Hz), which make the device ideal for use in

portable electronic devices. It also features

minimized click-and-pop noise during turn-on and

turn-off transitions.

 Available in COL1.5x1.5-9L, MSOP-8L, and

DFN2x2-8L packages

APPLICATIONS



Cellular handsets

Portable navigation devices

Multimedia internet devices

APPLICATION CIRCUIT

VDD

1uF

VDD

Cin 33nF

INP

VOP

Input

Class-D

Modulator

Output

Buffer

Cin 33nF

Buffer

INN

VON

Mode

Control

Pulse Input

Shutdown

Control

BIAS

AGND/PGND

Figure 1: Typical Application Circuit Diagram

Sep, 2012

www.fangtek.com

12 3 4 5 6 7...22

中文翻译

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