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TDA7265

25 +25W STEREO AMPLIFIER WITH MUTE & ST-BY

WIDE SUPPLY VOLTAGE RANGE (UP TO25V ABS MAX.)

SPLIT SUPPLY

HIGH OUTPUT POWER25 + 25W @ THD =10%, RL = 8, VS = +20V

NO POP AT TURN-ON/OFF

MUTE (POP FREE)

STAND-BY FEATURE (LOW Iq)

SHORT CIRCUIT PROTECTION

THERMAL OVERLOAD PROTECTION

DESCRIPTION

The TDA7265 is class AB dual Audio power am-plifier assembled in the Multiwatt package, spe-cially designed for high quality sound applicationas Hi-Fi music centers and stereo TV sets.

April 2002

Multiwatt11

ORDERING NUMBER: TDA7265

+5V

18K15K

IN (L)

1F

15K 1FMUTE/ST-BY

GND

IN (R)1F

4.7

4.7

100nF

100nF

OUT (L)

OUT (R)

1000F

1000F

+VS

35

7

9

6

112

4+

+

-

-

D94AU085

RL (L)

RL (R)

-VS

P560

18K

IN- (L)8

10 IN- (R)

1

560

18K

Figure 1: Typical Application Circuit in Split Supply

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ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

VS DC Supply Voltage 25 V

IO Output Peak Current (internally limited) 4.5 A

Ptot Power Dissipation Tcase = 70C 30 W

Top Operating Temperature -20 to 85 CTstg, Tj Storage and Junction Temperature -40 to +150 C

1

2

3

4

5

6

7

9

10

11

8

IN+(1)

IN-(1)

GND

IN-(2)

IN+(2)

-VS

MUTE

OUTPUT(2)

+VS

OUTPUT(1)

-VS

TAB CONNECTED TO PIN 6 D95AU316

PIN CONNECTION (Top view)

THERMAL DATA

Symbol Description Value Unit

Rth j-case Thermal Resistance Junction-case Max 2 C/W

PLAY5V

R215K

IN (L)

C3 1F

R110K

C11F

MUTE

IN (R)C4 1F

R84.7

R71K

C70.1F

OUT (L)

OUT (R)

C51000F

+VS

35

7

9

6

112

4+

+

-

-

D96AU444A

OUT(L)

OUT(R)

GND

R430K

IN- (L)8

10

IN- (R)

1

R5

1K

R630K

R94.7

C9 470F

C10 470F

C80.1F

R315K

0MUTE

Q1BSX33

C60.1F

D1 5.1V

C2

100F

Fig 2: Typical Application Circuit in Single Supply

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ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS = + 20V; RL = 8; RS = 50;GV = 30dB; f = 1KHz;Tamb = 25C, unless otherwise specified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

VS Supply Range +5 +25 V

Iq Total Quiescent Current 80 130 mA

VOS Input Offset Voltage 20 +20 mVIb Non Inverting Input Bias Current 500 nA

PO Music Output Power (*) THD = 10%; RL = 8 ;VS = + 22.5V

32 W

PO Output Power THD = 10%RL = 8 ;VS + 16V; RL = 4

20 2525

WW

THD = 1%RL = 8 ;VS + 16V; RL = 4

2020

WW

THD Total Harmonic Distortion RL = 8 ; PO = 1W; f = 1KHz 0.01 %

RL = 8 ;PO = 0.1 to 15W;f = 100Hz to 15KHz

0.7 %

RL = 4 ; PO = 1W; f = 1KHz 0.02 %

RL = 4 ; VS + 16V;PO = 0.1 to 12W;f = 100Hz to 15KHz

1 %

CT Cross Talk f = 1KHzf = 10KHz

7060

dBdB

SR Slew Rate 10 V/ s

GOL Open Loop Voltage Gain 80 dB

eN Total Input Noise A Curvef = 20Hz to 22KHz

34 8

VV

Ri Input Resistance 15 20 K

SVR Supply Voltage Rejection(each channel)

fr = 100Hz Vr = 0.5V 60 dB

Tj Thermal Shut-downJunction Temperature

145 C

MUTE FUNCTION [ref: +VS]

VTMUTE Mute / Play Threshold -7 -6 -5 V

AM Mute Attenuation 60 70 dB

STAND-BY FUNCTION [ref: +VS]

VTST-BY Stand-by / Mute Threshold -3.5 -2.5 -1.5 V

AST-BY Stand-by Attenuation 110 dB

Iq ST-BY Quiescent Current @ Stand-by 3 mA

Note :(*) FULL POWER up to. VS = 22.5V with RL = 8 and VS = 16V with RL = 4MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity)

1 sec after the application of a sinusoidal input signal of frequency 1KHz.

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Figure 3: Quiescent Current vs. Supply Voltage Figure 4: Frequency Response

Figure 5: Output Power vs. Supply Voltage Figure 6: T.H.D. vs. Output Power

Figure 7: Output Power vs. Supply Voltage Figure 8: T.H.D. vs. Output Power

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Figure 9: Quiescent Current vs. Pin # 5 Voltage Figure 10: Attenuation vs. Pin # 5 Voltage

Figure 11: SVR vs. Frequency Figure 12: Crosstalk vs. Frequency

Figure 13: Power Dissipaton vs. Output Power Figure 14: Power Dissipaton vs. Output Power

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MUTE STAND-BY FUNCTION

The pin 5 (MUTE/STAND-BY) controls the ampli-fier status by two different thresholds, referred to+VS.

- When Vpin5 higher than = +VS - 2.5V theamplifier is in Stand-by mode and the finalstage generators are off

- when Vpin5 is between +VS - 2.5V and +VS- 6V the final stage current generators areswitched on and the amplifier is in mutemode

- when Vpin5 is lower than +VS - 6V the am-plifier is play mode.

t

OFF

STDBY

MUTE MUTE MUTE MUTE

PLAY STDBY PLAY OFF

STDBY

20

+VS(V)

-20

-VS

VIN(mV)

Vpin5(V)

VS

VS-2.5

VS-6VS-10

Iq(mA)

0

VOUT

(V)

D94AU086

Figure 15

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R3

IN (L)

C1

R2 C3MUTE/

ST-BY

GND

IN (R)C2

R7

R10

C8

C9

OUT (L)

OUT (R)

C6

C4

+VS

35

7

9

6

112

4+

+

-

-

D94AU087B

RL (L)

RL (R)

+VS

-VS

R9

R5

IN- (L)8

10 IN- (R)

1

SW1

R1

DZ

R4

SW2

C7

R8

R6

C5

Q1

ST-BY

MUTE

Figure 16: Test and Application Circuit (Stereo Configuration)

Figure 17: PC Board and Components Layout of the figure 15 (1:1 scale)

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COMPONENTSRECOMMENDED

VALUEPURPOSE

LARGER THANRECOMMENDED VALUE

SMALLER THANRECOMMENDED VALUE

R1 10K Mute Circuit Increase of DzBiasing Current

R2 15K Mute Circuit Vpin # 5 Shifted Downward Vpin # 5 Shifted Upward

R3 18K Mute Circuit Vpin # 5 Shifted Upward Vpin # 5 Shifted Downward

R4 15K Mute Circuit Vpin # 5 Shifted Upward Vpin # 5 Shifted Downward

R5, R8 18K Closed Loop GainSetting (*)

Increase of Gain

R6, R9 560 Decrease of Gain

R7, R10 4.7 Frequency Stability Danger of Oscillations Danger of Oscillations

C1, C2 1FInput DC

Decoupling

Higher Low Frequency

Cutoff

C3 1FSt-By/Mute TimeConstant

Larger On/Off Time Smaller On/Off Time

C4, C6 1000FSupply VoltageBypass

Danger of Oscillations

C5, C7 0.1FSupply VoltageBypass

Danger of Oscillations

C8, C9 0.1F Frequency Stability

Dz 5.1V Mute Circuit

Q1 BC107 Mute Circuit

(*) Closed loop gain has to be => 25dB

APPLICATIONS SUGGESTION(Demo Board Schematic)

The recommended values of the external compo-

nents are those shown are the demo board sche-matic different values can be used: the followingtable can help the designer.

MUTE, STAND-BY TRUTH TABLE

SW1 SW2

B A STAND-BY

B B STAND-BY

A A MUTE

A B PLAY

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BRIDGE APPLICATION

Another application suggestion concerns theBRIDGE configuration, where the two power am-plifiers are connected as shown by the schematicdiagram of figure. 18.This application shows, however, some operativelimits due to dissipation and current capability of

the output stage. For this reason, we reccomendto use the TDA7265 in bridge with the supply volt-age equal/lower than 16V when the load is 8;with higher loads (i.e.16), the amplifier can workcorrectly in the whole supply voltage range.

The detected characteristics of T.H.D. vs Poutand Frequency Response are shown in fig.19 andfig.20.With R1=8, Vs=+/-16V the maximum outputpower obtainable is 50W at T.D.H.=10%.The quiescent current remains unchanged withrespect to the stereo configuration (~80mA as

typical at Vs=+/-16V).The last point to take into consideration concernsthe short-circuit protection. As for the stereo appli-cation, the TDA7265 is fully protected against anykind of short-circuit ( between Out/Gnd, Out/+Vsand Out/-Vs).

Figure 19: Distortion vs. Output Power Figure 20: Frequency Response of the Bridge Ap-plications

1F

ST-BY/MUTE

1F

R5 4.7

R64.7

C70.1F

C90.1F

C50.1F

C41000F

+VS

35

7

9

6

112

4+

+

-

-

D94AU190

RLR2

560

R136K

8

10

1

R4560

R336K

C1

IN

C2

C30.1F

C61000F

-VS

C85.6nF

Figure 18: Bridge Application Circuit

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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequencesof use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license isgranted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication aresubject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics productsare not authorized for use as crit ical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics2002 STMicroelectronics Printed in Italy All Rights Reserved

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