Philips tda7056b DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA7056B

5 W mono BTL audio amplifier with
DC volume control

Preliminary specification
Supersedes data of July 1994
File under Integrated Circuits, IC01

1996 May 28

Philips Semiconductors Preliminary specification

5 W mono BTL audio amplifier with DC

TDA7056B

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

O

G

v(max)

supply voltage 4.5 − 18 V
output power VP=12V

maximum total voltage gain 39.5 40.5 41.5 dB
φ gain control 68 73.5 − dB
I

q(tot)

total quiescent current VP= 12 V; RL= ∞− 9.2 13 mA
THD total harmonic distortion P

GENERAL DESCRIPTION

The TDA7056B is a mono Bridge-Tied Load (BTL) output
amplifier with DC volume control.
It is designed for use in TV and monitors, but is also
suitable for battery-fed portable recorders and radios.
The device is contained in a 9-pin medium power
package.

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

=16Ω 3 3.5 − W

R

L

=8Ω−5−W

R

L

= 0.5 W − 0.3 1 %

O

ORDERING INFORMATION

TYPE

NUMBER

TDA7056B SIL9MPF

NAME DESCRIPTION VERSION

plastic single in-line medium power package with fin; 9 leads

1996 May 28 2

PACKAGE

SOT110-1

Philips Semiconductors Preliminary specification

5 W mono BTL audio amplifier with DC
volume control

BLOCK DIAGRAM

handbook, full pagewidth

n.c.
n.c.

input

DC volume control

1

V

ref

TDA7056B

STABILIZER

TEMPERATURE

PROTECTION

9

3

5

TDA7056B

V

P

2

6I + i

positive output

I – i

8

negative output

PINNING

SYMBOL PIN DESCRIPTION

n.c. 1 not connected
V

P

V

I

2 positive supply voltage

3 voltage input
GND1 4 signal ground
VC 5 DC volume control
OUT+ 6 positive output
GND2 7 power ground
OUT− 8 negative output
n.c. 9 not connected

Fig.1 Block diagram.

handbook, halfpage

signal

ground

4

n.c.
V

GND1

VC
OUT
GND2
OUT

n.c.

power

ground

P

V

I

7

1
2
3
4

TDA7056B

5
6
7
8
9

MSA708 - 1

1996 May 28 3

MSA707

Fig.2 Pin configuration.

Philips Semiconductors Preliminary specification

5 W mono BTL audio amplifier with DC
volume control

FUNCTIONAL DESCRIPTION

The TDA7056B is a mono BTL output amplifier with DC
volume control, designed for use in TV and monitor but is
also suitable for battery-fed portable recorders and radios.

In conventional DC volume circuits the control or input
stage is AC coupled to the output stage via external
capacitors to keep the offset voltage low. In the TDA7056B
the DC volume control stage is integrated into the input
stage so that no coupling capacitors are required. With this
configuration, a low offset voltage is still maintained and
the minimum supply voltage 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.

TDA7056B

The maximum gain of the amplifier is fixed at 40.5 dB.
The DC volume control stage has 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 short-circuit proof to ground, V
across the load. Also a thermal protection circuit is
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.

Power dissipation

Assume V

= 12 V; RL=16Ω.

P

The maximum sine wave dissipation is = 1.8 W.
The R

Therefore T

of the package is 55 K/W.

th vj-a

amb (max)

= 150 − 55 × 1.8 = 51 °C.

and

P

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

V

3, 5

I

ORM

I

OSM

P

tot

T

amb

T

stg

T

vj

T

sc

supply voltage − 18 V
input voltage pins 3 and 5 − 5V
repetitive peak output current − 1.25 A
non-repetitive peak output current − 1.5 A
total power dissipation T

< 60 °C − 9W

case

operating ambient temperature −40 +85 °C
storage temperature −55 +150 °C
virtual junction temperature − +150 °C
short-circuit time − 1h

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

R
R

th j-a
th j-c

thermal resistance from junction to ambient in free air 55 K/W
thermal resistance from junction to case 10 K/W

1996 May 28 4