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Introduction to two-channel audio power amplifier circuit TDA2822

Source: InternetPublisher:D先生 Keywords: Audio power amplifier TDA2822 Updated: 2023/11/17

Overview and features

TDA2822 is a two-channel audio power amplifier circuit, suitable for use in pocket cassette players (WALKMAN), radio cassette players and multimedia speakers.

Use the box as an audio amplifier. The characteristics of this circuit are as follows: the power supply voltage range is wide (1.8~15V), and the power supply voltage can be as low as 1.8V and still work. Therefore, the circuit is suitable for working at low power supply voltage; the quiescent current is small, and the crossover distortion is also small; applicable It works in two working modes: mono bridge (BTL) or stereo line; it adopts dual in-line 8-pin plastic package (DIP8).

Block Diagram and Pinout Functions

Terminal number	symbol	Function	Terminal number	symbol	Function
1	OUT1	Output 1	5	IN2（―）	Reverse input terminal 2
2	VCC	power supply	6	IN2(+)	Positive input terminal 2
3	OUT2	Output 2	7	IN1(+)	Positive input terminal 1
4	GND	land	8	IN1（―）	Reverse input terminal 1

Maximum rating (Tamb=25℃)

parameter name		symbol	numerical value	unit
voltage		VCC	15	V
Output peak current		Iop	1	A
Power consumption	Tamb=50℃	PD	1	W
Power consumption	Tcase=50℃	PD	1.4	W
Junction temperature		TJ	150	℃
Storage temperature		Txt	-40～+150	℃

Electrical characteristics (unless otherwise stated, VCC=6.0V, Tamb=25℃) Stereo parameters

parameter name	symbol	Test Conditions			smallest	typical	maximum	unit
voltage	VCC				1.8		15	V
static The output voltage	VO					2.7		V
static The output voltage	VO	VCC=3V				1.2		V
Input bias current	IB					100		nA
Quiescent Current	ikB					6	9	mA
Output Power (each channel)	Po	f=1kHz THD=10%	RL=32Ω	VCC=9V		300		mW
				VCC=6V	90	120
				VCC=4.5V		60
				VCC=3V	15	20
				VCC=2V		5
			RL=16Ω	VCC=6V	170	220
			RL=8Ω	VCC=9V		1000
			RL=8Ω	VCC=6V	300	380
			RL=4Ω	VCC=6V	450	650
				VCC=4.5V		320
				VCC=3V		110
		RL=32Ω, PO=40mW				0.2		%
Distortion	THD	RL=16Ω, PO=75mW				0.2
		RL=8Ω, PO=150mW				0.2
closed loop gain	GV	f=1kHz			36	39	41	dB
channel smoothness	ΔGV						±1	dB
input resistance	Zi	f=1kHz			100			kΩ
input noise	VNI	Rg=10kΩBPF=20Hz～20kHz				2.5		μV
Power supply ripple rejection ratio	RR	f=100Hz C1=C2=100μF			twenty four	30		dB
Channel crosstalk	CT	f=1kHz				30		dB

BTL parameters

parameter name	symbol	Test Conditions			smallest	typical	maximum	unit
voltage	VCC				1.8		15	V
Quiescent Current	ikB	RL=∞				6	9	mW
Output offset voltage	ΔVO	RL=8Ω					±50	mW
Input bias current	IB					100		nA
Output Power	PO	f=1kHz THD =10%	RL=32Ω	VCC=9V		1000		mW
				VCC=6V	300	320
				VCC=4.5V		200
				VCC=3V	50	65
				VCC=2V		8
			RL=16Ω	VCC=9V		2000
				VCC=6V
				VCC=3V		120
			RL=8Ω	VCC=6V	900	1350
				VCC=4.4V		700
				VCC=3V		220
			RL=4Ω	VCC=4.5V		1000
				VCC=3V	200	350
				VCC=2V		80
Distortion	THD	Po=0.5W, RL=8Ω, f=1kHz				0.2		%
Closed loop voltage gain	GV	f=1kHz				39		dB
input resistance	Zi	f=1kHz			100			kΩ
total input noise	VN1	Rg=10kΩBPF=20Hz～20kHz				3		μV
Power supply ripple rejection ratio	RR	f=100Hz				40		dB
Power bandwidth	BW	RL=8Ω, Po=1W				120		kHz

Application circuit

( 1 ) TDA2822 stereo application circuit

( 2 ) TDA2822 mono bridge ( BTL ) application circuit

D先生

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