TDA7262.PDF

TDA7262

20+20W STEREO AMPLIFIER WITH STAND-BY

,V S = 28V

HIGH CURRENT CAPABILITY (UP TO 3.5A)

STAND-BY FUNCTION

AC SHORT CIRCUIT PROTECTION

THERMAL OVERLOAD PROTECTION

DESCRIPTION

The TDA7262 is class AB dual Hi-Fi Audio power

amplifier assembled in Multiwatt package, spe-

cilally designed for high quality stereo application

as Hi-Fi music centers and TV sets.

MULTIWA TT11

ORDERING NUMBER: TDA7262

Figure 1: Stereo Application Circuit with Stand-By

March 1995

1/8

WIDE SUPPLY VOLTAGE RANGE

HIGH OUTPUT POWER

28+28W TYP. MUSIC POWER

20+20W @ THD = 10%, R L =4

TDA7262

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V S

Supply Voltage

I O

Output Peak Current (repetitive f > 20Hz)

3.5

I O

Output Peak Current (non repetitive, t > 100

4.5

P tot

Power Dissipation (T case =70

T stg ,T j

Storage and Junction Temperature

-40 to 150

PIN CONNECTION

TEST CIRCUIT

2/8

TDA7262

THERMAL DATA

Symbol

Description

Value

Unit

R th j-case

Thermal Resistance Junction-case

Max

2.5

C/W

ELECTRICAL CHARACTERISTICS (Refer to the stereo test circuit, V S = 28V; f = 1KHz; T amb =25

unless otherwise specified)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

V S

Supply Voltage

V O

Quiescent Output Voltage

V S = 32V

15.5

I d

Total Quiescent Current

V S = 28V

V S = 32V

120

P O

Output Power (each channel)

Music Power STD rules (T = 1s)

V S = 32V; d = 10%; R L =4

R L =8

Total Harmonic Distortion

f = 100Hz to 10KHz

P O = 0.1 to 14W; R L =4

P O = 0.1 to 8W; R L =8

0.2

0.1

Cross Talk

R L =4

R S = 100

f = 1KHz

f = 10KHz

V i

Input Saturation Voltage

(Vrms)

300

R i

Input Resistance

f = 1KHz; non inverting Input

200

f L

Low Frequency roll-off (-3dB)

R L =4

f H

High Frequency roll-off (-3dB)

R L =4

KHz

G V

Closed Loop Voltage Gain

f = 1KHz

35.5

36.5

G V

Closed Loop Gain match

0.5

e N

Total Input Noise Voltage

A Curve; R S = 10K

1.5

f = 22Hz to 22KHz; R S = 10K W

2.5

m V

SVR

Supply Voltage Rejection

(each channel)

R S = 0 to 10K

;f r = 100Hz

V r = 0.5V

T j

Thermal Shutdown Junction

Temperature

145

° C

STAND-BY FUNCTION

V 3

Stand-By Threshold

V S = 32V

0.45

0.9

A M

Stand-By Attenuation

V S = 32V; V 3 < 0.45V

100

I M

Stand-By Quiescent Current

V S = 32V; V 3 < 0.45V

3/8

d = 10%

R L =4

d=1%

R L =4

TDA7262

APPLICATION SUGGESTION

The recommended values of the components are those shown on application circuit of Figure 1. Differ-

ent values can be used; the following table can help the designer.

Component

Recomm.

Value

Purpose

Larger than

Smaller than

R1 and R3

1.3K

Close loop gain setting (*)

Increase of gain

Decrease of gain

R2 and R4

Decrease of gain

Increase of gain

R5 and R6

Frequency stability

Danger of oscillations

C1 and C2

2.2

Input DC decoupling

higher turn-on delay

- worse turn-ON pop

- higer low freq. cutoff.

Increase of noise

F (**)

- Ripple rejection

- Stand-by time constant

Increase of the

Switch-on time

- Degradation of SVR

- worse turn-OFF pop by

stand-by

100nF

Supply setting

Danger of oscillations

1000

Supply setting

worse turn-OFF pop

C6 and C7

220

Feedback input DC

decoupling

C8 and C9

0.1

Frequency stability

Danger of oscillations

C10 and C11

1000

Fto

Output DC decoupling

Higher low-frequency

cut-off

2200

(*) Closed loop gain must be higher than 26dB.

(**) 220

F in case of stand-by utilization.

Figure 2: Ouput Power vs. Supply Voltage

Figure 3: Ouput Power vs. Supply Voltage

4/8

TDA7262

Figure 4: Distortion vs. Ouput Power

Figure 5: Distortion vs. Ouput Power

Figure 6: Quiescent Current vs. Supply Voltage

Figure 7: Supply Voltage Rejection vs. Frequency

Figure 8: Output Attenuation vs. Vpin 3

Figure 9: Total Power Dissipation & Efficiency

vs. Output Power

5/8

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