Philips TDA7053A User Manual

INTEGRATED CIRCUITS

DATA SH EET

TDA7053A

Stereo BTL audio output amplifier
with DC volume control

Product specification
Supersedes data of 1995 Nov 09
File under Integrated Circuits, IC01

1997 Jul 15

Philips Semiconductors Product specification

Stereo BTL audio output amplifier with DC

TDA7053A

volume control

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.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

P

out

supply voltage 4.5 − 18 V
output power VP=6V

TDA7053A R

TDA7053AT R
G
G
I

q(tot)

v
C

voltage gain 39.5 40.5 41.5 dB
gain control 68.0 73.5 − dB
total quiescent current VP=6V; RL=∞−22 25 mA

THD total harmonic distortion

TDA7053A P

TDA7053AT P

out
out

GENERAL DESCRIPTION

The TDA7053A (2 × 1 W) and TDA7053AT (2 × 0.5 W) are
stereo BTL output amplifiers with DC volume control.
The devices are designed for use in TV and monitors, but
are 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
headphone applications (single-ended).

=8Ω 0.85 1.0 − W

L

=16Ω 0.5 0.55 − W

L

= 0.5 W − 0.3 1 %
= 0.25 W − 0.3 1 %

ORDERING INFORMATION

TYPE

NUMBER

TDA7053A DIP16
TDA7053AT SO16

NAME DESCRIPTION VERSION

plastic dual in-line package; 16 leads (300 mil); long body
plastic small outline package; 16 leads; body width 7.5 mm

1997 Jul 15 2

PACKAGE

SOT38-1

SOT162-1

Philips Semiconductors Product specification

Stereo BTL audio output amplifier with DC
volume control

BLOCK DIAGRAM

TDA7053A

TDA7053AT

V

ref

STABILIZER

input 1

DC volume

control 1

4

2

V

P

5

I i

Ι

I i

TEMPERATURE

PROTECTION

TDA7053A

positive

16

output 1

negative

13

output 1

input 2

DC volume

control 2

6

8

not

connected

1,3,11,15

I i

ΙΙ

I i

signal

ground

power

ground 1

Fig.1 Block diagram.

12

negative
output 2

9

positive
output 2

14

107

power

ground 2

MSA717 - 2

1997 Jul 15 3

Philips Semiconductors Product specification

Stereo BTL audio output amplifier with DC
volume control

PINNING

SYMBOL PIN DESCRIPTION

n.c. 1 not connected
VC1 2 DC volume control 1
n.c. 3 not connected
V

I (1)

V

P

V

I (2)

SGND 7 signal ground
VC2 8 DC volume control 2
OUT2+ 9 positive output 2
PGND2 10 power ground 2
n.c. 11 not connected
OUT2− 12 negative output 2
OUT1− 13 negative output 1
PGND1 14 power ground 1
n.c. 15 not connected
OUT1+ 16 positive output 1

4 voltage input 1
5 positive supply voltage
6 voltage input 2

1

n.c.

2

VC1

n.c.

3

V

4

I (1)

V

V

I (2)

SGND

VC2

P

TDA7053A

TDA7053AT

5
6
7
8

MSA719 - 2

Fig.2 Pin configuration.

TDA7053A

16

OUT1

n.c.

15

PGND1

14
13

OUT1
OUT2

12

n.c.

11

PGND2

10

OUT2

9

FUNCTIONAL DESCRIPTION

The TDA7053A and TDA7053AT are stereo output
amplifiers with two DC volume control stages, designed for
TV and monitors, but 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.

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 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 short-circuit protected to ground, V

and

P

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.

1997 Jul 15 4

Philips Semiconductors Product specification

Stereo BTL audio output amplifier with DC

TDA7053A

volume control

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

I

ORM

I

OSM

P

tot

t

sc

V

n

T

amb

T

stg

T

vj

THERMAL CHARACTERISTICS

supply voltage − 18 V
repetitive peak output current − 1.25 A
non-repetitive peak output current − 1.5 A
total power dissipation T

amb

≤ 25 °C
TDA7053A − 2.5 W
TDA7053AT − 1.32 W

short-circuit time − 1hr
input voltage pins 2, 4, 6 and 8 − 5V
operating ambient temperature −40 +85 °C
storage temperature −55 +150 °C
virtual junction temperature − +150 °C

SYMBOL PARAMETER VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air

TDA7053A 50 K/W
TDA7053AT 95 K/W

Power dissipation

TDA7053A:

Assume V

= 6 V and RL=8Ω.

P

The maximum sine wave dissipation is 2 × 0.9 W = 1.8 W.
The R

of the package is 50 K/W therefore T

th j-a

amb(max)

= 150 − (50 × 1.8) = 60 °C.

TDA7053AT:

Assume V

= 6 V and RL=16Ω.

P

The maximum sine wave dissipation is 2 × 0.46 W = 0.92 W.
The R

of the package is 95 K/W therefore T

th j-a

amb(max)

= 150 − (95 × 0.92) = 62.6 °C.

1997 Jul 15 5