Philips TDA7057AQ-N2-S1, TDA7057AQ-N2 Datasheet

DATA SH EET

Product specification
Supersedes data of 1997 July 15
File under Integrated Circuits, IC01

1998 Apr 07

INTEGRATED CIRCUITS

TDA7057AQ

2 × 8 W stereo BTL audio output
amplifier with DC volume control

1998 Apr 07 2

Philips Semiconductors Product specification

2 × 8 W stereo BTL audio output amplifier
with DC volume control

TDA7057AQ

FEATURES

• DC volume control

• Few external components

• Mute mode

• Thermal protection

• Short-circuit proof

• No switch-on and switch-off clicks

• Good overall stability

• Low power consumption

• Low HF radiation

• ESD protected on all pins.

GENERAL DESCRIPTION

The TDA7057AQ is a stereo BTL output amplifier with DC
volume control. The device is designed for use in TVs and
monitors, but is also suitable for battery-fed portable
recorders and radios.

Missing Current Limiter (MCL)

A MCL protection circuit is built-in. The MCL circuit is
activated when the difference in current between the
output terminal of each amplifier exceeds 100 mA
(typical 300 mA). This level of 100 mA allows for
single-ended headphone applications.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

supply voltage 4.5 − 18 V

P

out

output power VP= 12 V; RL=16Ω 3.0 3.5 − W

V

P

= 12 V; RL=8Ω− 5.3 − W

V

P

= 15 V; RL=8Ω− 8 − W

G

v

voltage gain 39.5 40.5 41.5 dB

∆G

v

voltage gain control 68 73.5 − dB

I

q(tot)

total quiescent current VP= 12 V; RL= ∞−22 25 mA

THD total harmonic distortion P

o

= 0.5 W − 0.3 1 %

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA7057AQ DBS13P plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm) SOT141-6

1998 Apr 07 3

Philips Semiconductors Product specification

2 × 8 W stereo BTL audio output amplifier
with DC volume control

TDA7057AQ

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MSA714

I i

I i

Ι

STABILIZER

TEMPERATURE

PROTECTION

V

ref

11

1

3

13

I i

I i

ΙΙ

8

7

5

10

12

power

ground 1

9

power

ground 2

6

signal

ground

2

not

connected

input 1

DC volume

control 1

input 2

DC volume

control 2

TDA7057AQ

4

V

P

positive
output 1

negative
output 1

negative
output 2

positive
output 2

1998 Apr 07 4

Philips Semiconductors Product specification

2 × 8 W stereo BTL audio output amplifier
with DC volume control

TDA7057AQ

PINNING

SYMBOL PIN DESCRIPTION

VC1 1 DC volume control 1
n.c. 2 not connected
V

l (1)

3 voltage input 1

V

P

4 positive supply voltage

V

l (2)

5 voltage input 2
SGND 6 signal ground
VC2 7 DC volume control 2
OUT2+ 8 positive output 2
PGND2 9 power ground 2
OUT2− 10 negative output 2
OUT1− 11 negative output 1
PGND1 12 power ground 1
OUT1+ 13 positive output 1

Fig.2 Pin configuration.

handbook, halfpage

1
2
3
4
5
6
7
8

9
10
11
12
13

TDA7057AQ

VC1

n.c.

V

P

I (1)

V

I (2)

V

SGND

VC2
OUT2
PGND2
OUT2
OUT1

OUT1

PGND1

MSA716

FUNCTIONAL DESCRIPTION

The TDA7057AQ is a stereo output amplifier with two DC
volume control stages. The device is designed for TVs and
monitors, but is also suitable for battery-fed portable
recorders and radios.

In conventional DC volume control circuits the control or
input stage is AC-coupled to the output stage via external
capacitors to keep the offset voltage low.

In the TDA7057AQ the two DC volume control stages are
integrated into the input stages so that no coupling
capacitors are required and a low offset voltage is still
maintained. The minimum supply voltage also remains
low.

The BTL principle offers the following advantages:

• Lower peak value of the supply current

• The frequency of the ripple on the supply voltage is twice

the signal frequency.

Consequently, a reduced power supply with smaller
capacitors can be used which results in cost reductions.

For portable applications there is a trend to decrease the
supply voltage, resulting in a reduction of output power at
conventional output stages. Using the BTL principle
increases the output power.

The maximum gain of the amplifier is fixed at 40.5 dB.
The DC volume control stages have a logarithmic control
characteristic. Therefore, the total gain can be controlled
from +40.5 dB to −33 dB. If the DC volume control voltage
falls below 0.4 V, the device will switch to the mute mode.

The amplifier is a short-circuit protected to ground, V

P

and
across the load. A thermal protection circuit is also
implemented. If the crystal temperature rises above
+150 °C the gain will be reduced, thereby reducing the
output power.

Special attention is given to switch-on and switch-off
clicks, low HF radiation and a good overall stability.

1998 Apr 07 5

Philips Semiconductors Product specification

2 × 8 W stereo BTL audio output amplifier
with DC volume control

TDA7057AQ

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

THERMAL CHARACTERISTICS

Power dissipation

Assume V

P

= 12 V and RL=16Ω. The maximum sine wave dissipation is 2 × 1.8 W = 3.6 W.

At T

amb(max)

=60°C:

R

th tot

= (150 − 60)/3.6 = 25 K/W.

R

th tot=Rth j-c+Rth c-hs+Rth hs

.

R

th c-hs+Rth hs

=25−4 = 21 K/W.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

supply voltage − 18 V

I

ORM

repetitive peak output current − 1.25 A

I

OSM

non-repetitive peak output current − 1.5 A

P

tot

total power dissipation T

case

<60°C − 22.5 W

T

amb

operating ambient temperature −40 +85 °C

T

stg

storage temperature −55 +150 °C

T

vj

virtual junction temperature − 150 °C

t

sc

short-circuit time − 1hr

V

n

input voltage pins 1, 3, 5 and 7 − 5V

SYMBOL PARAMETER VALUE UNIT

R

th j-c

thermal resistance from junction to case 4 K/W

R

th j-a

thermal resistance from junction to ambient in free air 40 K/W