Datasheet > FT2923

FT2923

更新时间： 2022-02-26 14:00:11

品牌	Logo	应用领域
FANGTEK		电池
页数	文件大小	规格书
27页	1733K
描述
2x4.5W Class-G Stereo Audio Power Amplifier with Automatic Level Control & Battery Tracking AGC

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FT2923 数据手册

ft2923

2x4.5W Class-G Stereo Audio Power Amplifier

with Automatic Level Control & Battery Tracking AGC

GENERAL DESCRIPTION

FEATURES

The ft2923 is a highly efficient 2x4.5W Class-G stereo

audio power amplifier with automatic level control (ALC)

and battery tracking AGC. It integrates dual filterless

Class-D audio amplifiers with an adaptive Class-G

synchronous boost regulator and operates with a range

of supply voltages from 3V to 5.5V. When operating

with 3.6V supply voltage, the ft2923 can deliver an

output power of 4.5W per channel with 10% THD+N, or

an ALC output power of 3.5W per channel with 0.3%

THD+N, into a pair of 4Ω speakers.

 Wide range of supply voltages from 3V to 5.5V

 Filterless Class-D audio amplifier integrated with a

Class-G synchronous boost regulator

 Automatic level control to eliminate output clipping

 Battery tracking AGC to prevent battery collapse

 Soft drive mode for EMI reduction

 Maximum output power (Non-ALC Mode)

(VBAT=3.6V, ALC=VBAT, THD+N=10%)

4.5W/Ch (4Ω Load)

2.7W/Ch (8Ω Load)

 ALC output power (ALC Mode)

(VBAT=3.6V, ALC=NC, THD+N=0.3%)

3.5W/Ch (4Ω Load)

In ft2923, the power supply rails of the audio amplifiers’

output stages are internally boosted and regulated by a

synchronous PWM switching regulator with two

integrated power switches. The boost regulator

employs current-mode PWM control with proprietary

Class-G operation to regulate the boosted output

voltage dynamically in response to the voltage level of

the audio outputs.

2.0W/Ch (8Ω Load)

 Wide ALC dynamic range: 13dB

 Maximum voltage gain: 30dB

 High efficiency: 76%

(VBAT=3.6V, 4Ω Load, Po=2W/Ch, both channels driven)

 Volume fade-in and fade-out

The ft2923 features ALC function to constantly monitor

and safeguard the audio outputs against the boosted

supply voltages, preventing output clipping distortion,

excessive power dissipation, and speaker over-load.

Once an over-level condition is detected in either

channel, the ALC lowers the voltage gain of both audio

amplifiers together to limit the peak audio outputs.

 Under-voltage lockout protection

 Auto-recovering over-current & short-circuit

protection

 Thermal over-load protection

 Available in TSSOP-28L package

APPLICATIONS

In conjunction with ALC, as the battery supply voltage

drops below a prescribed value, the battery tracking

AGC lowers the voltage gain of both audio amplifiers to

limit the peak audio outputs, preventing the collapse of

battery voltage.

 Blue Tooth Speakers

 Portable Audio Decks

 Consumer Audio Electronics

APPLICATION CIRCUIT

CVBAT

VDD

RS1 10Ω

1uF

VBAT

INNL

INPL

AGND

Cin 0.22uF

20K

Rin

Rin 20K

INNL

INPL

INNR

INPR

INNR

INPR

Cin

0.22uF

Cin

0.22uF

PGND

VOPL

VONL

PVDDL

AVDD

BVDD

PGND

VOPR

VONR

PVDDR

PVSNS

PVOUT

PGNDB

LSL

SPEAKER

PVDD

LSR

SPEAKER

PVDD

CPVDDL

1uF

CPVDDR

1uF

CAVDD

1uF CBVDD

0.1uF

RS2 10Ω

CPVOUT

100uF

VKNEE

ALC

CPVOUT

0.1uF

CPVOUT

22uF

SDRIVE

ft2923

VDD

2.2uH

22uF

0.1uF

Figure 1: Typical Application Circuit of ft2923

DEC, 2017

www.fangtek.com.cn

12 3 4 5 6 7...27

中文翻译

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与FT2923相关器件

型号	品牌	获取价格	描述	数据表
ft2923P	FANGTEK	获取价格	2x4.5W Class-G Stereo Audio Power Amplifier with Automatic Level Control & Battery Trackin
FT2925	FANGTEK	获取价格	2x6W Class-G Stereo Audio Power Amplifier with Automatic Level Control & Battery Tracking
ft2925P	FANGTEK	获取价格	2x6W Class-G Stereo Audio Power Amplifier with Automatic Level Control & Battery Tracking
FT29F010A	FORCE	获取价格	1 Megabit (128 K x 8-bit) Uniform Sector Flash Memory CMOS 5.0 Volt-only
FT29F010B	FORCE	获取价格	1 Megabit (128 K x 8-bit) Uniform Sector Flash Memory CMOS 5.0 Volt-only
FT29F010B120DC-S	FORCE	获取价格	1 Megabit (128 K x 8-bit) Uniform Sector Flash Memory CMOS 5.0 Volt-only
FT29F010B120DI-S	FORCE	获取价格	1 Megabit (128 K x 8-bit) Uniform Sector Flash Memory CMOS 5.0 Volt-only
FT29F010B120DLF-S	FORCE	获取价格	1 Megabit (128 K x 8-bit) Uniform Sector Flash Memory CMOS 5.0 Volt-only
FT29F010B120DMB-S	FORCE	获取价格	1 Megabit (128 K x 8-bit) Uniform Sector Flash Memory CMOS 5.0 Volt-only
FT29F010B120DM-S	FORCE	获取价格	1 Megabit (128 K x 8-bit) Uniform Sector Flash Memory CMOS 5.0 Volt-only

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