ST TDA7264 User Manual

25 W + 25 W stereo amplifier with mute and standby

Features

 Wide supply voltage range (up to ±22.5 V)

 Split supply

 High output power

– 25 W + 25 W into 8 Ω

with V

 No “pop” at turn on/off

 Mute (“pop”-free)

 Standby feature (low I

 Few external components

 Short-circuit protection

 Thermal overload protection

Table 1. Device summary

= ±20 V and THD = 10%

S

)

q

TDA7264

Multiwatt8

Description

The TDA7264 is class-AB dual audio power
amplifier assembled in a Multiwatt package.

It is specially designed for high-quality sound
applications such as hi-fi music centers and
stereo TV sets.

Order code Operating temperature Package Packaging

TDA7264 0 to 70 °C Multiwatt8 Tube

Figure 1. Applications circuit

+V

S

15K

1µF

+5V

µP

1µF

1µF

MUTE/
ST-BY

IN (L)

18K15K

IN (R)

D94AU069A

GND

4

6

7

8

+

-

-

+

1000µF

+V

2

5

-V

S

S

3

1

OUT (L)

4.7Ω

OUT (R)

4.7Ω

1000µF

RL (L)

100nF

RL (R)

100nF

July 2009 Doc ID 1477 Rev 6 1/14

www.st.com

14

Pin description TDA7264

1 Pin description

Figure 2. Pin connection (top view)

Tab connected to pin 5

8

7

6

5

4

3

2

1

D94AU096

IN (1)

GND

IN (2)

-V

S

MUTE/ST-BY

OUTPUT (2)

+V

S

OUTPUT (1)

2/14 Doc ID 1477 Rev 6

TDA7264 Electrical specifications

2 Electrical specifications

2.1 Absolute maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

S

I

O

P

tot

T

op

T

j

T

stg

DC supply voltage ±25 V

Output Peak Current (internally limited) 4.5 A

power Dissipation T

= 70°C 30 W

case

Operating temperature -20 to 85 °C

Junction temperature -40 to 150 °C

Storage temperature -40 to 150 °C

2.2 Thermal data

Table 3. Thermal data

Symbol Parameter Min Typ Max Unit

R

th j-case

Thermal resistance, junction to case - - 2 °C/W

2.3 Electrical specifications

Unless otherwise stated, the results in Ta bl e 4 below are given for the conditions:
V

=±20V, RL (load) = 8 Ω, RS (source) = 50 Ω, f = 1 kHz, and T

S

applications circuit in Figure 12 on page 9.

Table 4. Electrical specifications

= 25° C. See also the

amb

Symbol Parameter Conditions Min Typ Max Unit

V

S

I

q

P

OM

Supply voltage range - ±5 - ±22.5 V

Total quiescent current - - 80 130 mA

Music output power

(1)

THD = 10%,

= 8 Ω, VS= ±22.5 V

R

L

-32-W

THD = 10%:

= 8 Ω, VS = ±20 V

R

L

20

RL = 4 Ω, VS = ±16 V

P

O

Output power

THD = 1%:

= 8 Ω, VS = ±20 V

R

L

RL = 4 Ω, VS = ±16 V

-

25
25

20
20

-

W

-

Doc ID 1477 Rev 6 3/14

Electrical specifications TDA7264

Table 4. Electrical specifications (continued)

Symbol Parameter Conditions Min Typ Max Unit

THD Total harmonic distortion

PO= 1 W, f = 1 kHz,

= 8 Ω, VS = ±20 V,

R

L

= 0.1 to 15 W,

P

O

f = 100 Hz to 15 kHz,

= 8 Ω, VS = ±20 V

R

L

P

= 1 W, f = 1 kHz,

O

RL = 4 Ω, VS = ±16 V,

P

= 0.1 to 12 W,

O

f = 100 Hz to 15 kHz,

-0.02-

--0.5

%

-0.03-

--1.0

RL = 4 Ω, VS = ±16 V

C

T

Crosstalk

f = 1 kHz
f = 10 kHz

70

-

-dB

60

SR Slew rate - - 10 - V/µs

G

V

∆G

V

eN Total input noise

R

i

SVRR Supply voltage rejection ratio f

T

j

Closed-loop voltage gain - 29 30 31 dB

Voltage gain matching - - 0.2 - dB

A curve
f = 20 Hz to 22 kHz

-

2.5

-

3.58-

µV

Input resistance - 15 20 - kΩ

= 100 Hz, Vr = 0.5 V - 60 - dB

r

Junction temperature at thermal
shut-down

- - 145 - °C

Mute mode (see also Table 5 on page 8)

VT

A

MUTE

MUTE

Mute/play threshold - -7 -6 -5 V

Mute attenuation - 60 90 - dB

Standby mode (see also Table 5 on page 8)

VT

STBY

A

STBY

I

q_STBY

1. FULL POWER up to VS = ±22.5 V with RL = 8 Ω and VS = ±16 V with RL = 4 Ω.
MUSIC POWER is the maximum power which the amplifier is capable of producing across the rated load
resistance (regardless of non-linearity) 1 s after the application of a sinusoidal input signal of frequency
1kHz.

Standby/mute threshold - -3.5 -2.5 -1.5 V

Standby attenuation - - 110 - dB

Quiescent current in standby - - 3 - mA

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TDA7264 Characterization curves

3 Characterization curves

Figure 3. Quiescent current vs Supply Voltage

Figure 4. Frequency response

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Characterization curves TDA7264

Figure 5. Output power vs supply voltage

Figure 6. Distortion vs output power

Figure 7. Crosstalk vs frequency

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TDA7264 Characterization curves

Figure 8. SVRR vs frequency

Figure 9. Attenuation and quiescent current vs voltage on pin 4

Figure 10. Power dissipation vs output power

Doc ID 1477 Rev 6 7/14

Mute and standby modes TDA7264

4 Mute and standby modes

Pin 4 (MUTE/STANDBY) controls the amplifier status by two different thresholds referenced
to +V

as given in Tab le 5 below. See also Table 4: Electrical specifications on page 3.

S

Table 5. Mute and standby thresholds on pin 5

Nominal voltage on pin 4,

V

PIN4

Mode Remarks

> +VS - 2.5 V Standby Output stages turned off

> +V

- 6.0 V, < +VS - 2.5 V Mute Output stages turned on, amplifiers muted

S

- 6.0 V Play Amplifiers active

< +V

S

Figure 11. Mute and standby thresholds on pin 4

+V

S

(V)

20

t

-V

S

-20

V

IN

(mV)

Vpin4

(V)

V

S

VS-2.5

V

6

S-

V

-10

S

I

q

(mA)

0

VOUT

(V)

OFF

STDBY

MUTE

D94AU084

8/14 Doc ID 1477 Rev 6

PLAY STDBY PLAY OFF

STDBY

MUTE

MUTE

MUTE

TDA7264 Applications information

5 Applications information

Figure 12. Schematic of demo board

+V

S

R2

B

A

R1

SW1

ST-BY

SW1 SW2 Mode

AAStandby

AB Standby

BBMute

BAPlay

DZ

15KC31µF

Q1

R4

15K

A

B

SW2

MUTE

C1 1µF

C2 1µF

MUTE/
ST-BY

IN (L)

R3

18K

IN (R)

D94AU068B

GND

4

6

7

8

Figure 13. Component layout of demo-board

+

-

-

+

C7

100nF

+V

2

5

-V

C5

100nF

RL (L)

RL (R)

OUT (L)

4.7Ω

OUT (R)

4.7Ω

C4

1000µF

R5

C8

100nF

R6

C9

100nF

S

3

1

S

C6

1000µF

Doc ID 1477 Rev 6 9/14

Applications information TDA7264

Table 6. Recommended component values for demo board

Component

Recommended

value

Purpose

R1 10 kΩ Mute circuit

R2 15 kΩ Mute circuit

R3 18 kΩ Mute circuit

R4 15 kΩ Mute circuit

Larger than

recommended

value

Decrease in DZ
biasing current

shifted

V

PIN4

downwards

V

shifted

PIN4

upwards

shifted

V

PIN4

upwards

Smaller than

recommended

value

-

V

shifted

PIN4

upwards

V

shifted

PIN4

downwards

V

shifted

PIN4

downwards

R5, R6 4.7 Ω Frequency stability Danger of oscillation Danger of oscillation

C1, C2 1 µF Input AC coupling -

C3 1 µF

C4, C6 1000 µF

C5, C7 0.1 µF

Standby/mute time
constant

Supply voltage
decoupling

Supply voltage
decoupling

Longer on/off time Shorter on/off time

- Danger of oscillation

- Danger of oscillation

Higher low­frequency cutoff

C8, C9 0.1 µF Frequency stability - -

Dz 5.1 V Mute circuit - -

Q1 BC107 Mute circuit - -

10/14 Doc ID 1477 Rev 6

TDA7264 Package mechanical data

6 Package mechanical data

The TDA7264 comes in a 8-pin Multiwatt package with pin 5 internally connected to the
metal tab.

Figure 14. Multiwatt8 outline drawing

ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK

In order to meet environmental requirements, ST offers these devices in different grades of

®

packages, depending on their level of environmental compliance. ECOPACK®

®

is an ST trademark.

Doc ID 1477 Rev 6 11/14

Package mechanical data TDA7264

Table 7. Multiwatt8 package dimensions

Dimensions in mm Dimensions in inches

Reference

Min Typ Max Min Typ Max

A --5.00--0.197

B --2.65--0.104

C --1.60--0.063

E 0.49 - 0.55 0.019 - 0.22

F 0.78 - 0.85 0.031 - 0.033

G 2.40 2.54 2.68 0.094 0.100 0.106

G1 17.64 17.78 17.92 0.694 0.700 0.706

H1 19.60 - - 0.772 - -

H2 - - 20.20 - - 0.787

L 20.35 - 20.65 0.801 - 0.813

L2 17.05 17.20 17.35 0.671 0.677 0.683

L3 17.25 17.50 17.75 0.679 0.689 0.699

L4 10.30 10.70 10.90 0.406 0.421 0.429

L7 2.65 - 2.90 0.104 - 0.114

N --- ---

N1 --- ---

P --- ---

Q --- ---

R1 --- ---

S 1.90 - 2.60 0.075 - 0.102

S1 1.90 - 2.60 0.075 - 0.102

U 0.40 - 0.55 0.016 - 0.022

V - 5 deg - - 5 deg -

Z 0.70 - 0.85 - - 0.033

Diam.1 3.65 - 3.85 0.144 - 0.152

Diam.2 --- ---

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TDA7264 Revision history

7 Revision history

Table 8. Document revision history

Date Revision Changes

Jan-2004 5 First issue in EDOCS

01-Jul-2009 6 Removed references to TDA7264A

Doc ID 1477 Rev 6 13/14

TDA7264

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