Philips TDA7056B-N1-S5, TDA7056B-N1 Datasheet

DATA SH EET

Product specification
Supersedes data of 1996 May 28
File under Integrated Circuits, IC01

1997 Aug 15

INTEGRATED CIRCUITS

TDA7056B

5 W mono BTL audio amplifier with
DC volume control

1997 Aug 15 2

Philips Semiconductors Product specification

5 W mono BTL audio amplifier with DC
volume control

TDA7056B

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 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).

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

supply voltage 4.5 − 18 V

P

O

output power VP=12V

R

L

=16Ω 3 3.5 − W

R

L

=8Ω 5 5.5 − W

G

v(max)

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

O

= 0.5 W − 0.3 1 %

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA7056B SIL9MPF

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

SOT110-1

1997 Aug 15 3

Philips Semiconductors Product specification

5 W mono BTL audio amplifier with DC
volume control

TDA7056B

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

input

7

MSA708 - 1

2

3

TDA7056B

V

P

5

6I + i

8

I – i

TEMPERATURE

PROTECTION

4

signal

ground

DC volume control

1

n.c.

positive output

negative output

power

ground

V

ref

STABILIZER

9

n.c.

PINNING

SYMBOL PIN DESCRIPTION

n.c. 1 not connected
V

P

2 positive supply voltage

V

I

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.2 Pin configuration.

handbook, halfpage

MSA707

1
2
3
4
5
6
7
8
9

I

V

TDA7056B

n.c.
V

P

OUT

GND2

OUT

GND1

VC

n.c.

1997 Aug 15 4

Philips Semiconductors Product specification

5 W mono BTL audio amplifier with DC
volume control

TDA7056B

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.

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

P

and
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

P

= 12 V; RL=16Ω.

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

th vj-a

of the package is 55 K/W.

Therefore T

amb (max)

= 150 − 55 × 1.8 = 51 °C.

LIMITING VALUES

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

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

supply voltage − 18 V

V

3, 5

input voltage pins 3 and 5 − 5V

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 − 9W

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 − 1h

SYMBOL PARAMETER VALUE UNIT

R

th j-a

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

R

th j-c

thermal resistance from junction to case 10 K/W

1997 Aug 15 5

Philips Semiconductors Product specification

5 W mono BTL audio amplifier with DC
volume control

TDA7056B

CHARACTERISTICS

V

P

= 12 V; VDC= 1.4 V; f = 1 kHz; RL=16Ω; T

amb

=25°C; unless otherwise specified (see Fig.13).

Notes

1. With a load connected to the outputs the quiescent current will increase, the maximum value of this increase being
equal to the DC output offset voltage divided by R

L

.

2. The noise output voltage (RMS value) at f = 500 kHz is measured with RS=0Ω and B = 5 kHz.

3. The ripple rejection is measured with RS=0Ω and f = 100 Hz to 10 kHz. The ripple voltage VR of 200 mV
(RMS value) is applied to the positive supply rail.

4. The noise output voltage (RMS value) is measured with RS=5kΩ unweighted.

5. The DC volume control can be configured in several ways. Two possible circuits are shown in Figs 14 and 15.
The circuits at the volume control pin will influence the switch-on and switch-off behaviour and the maximum voltage
gain.

SYMBOL P ARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

positive supply voltage 4.5 − 18 V

I

q(tot)

total quiescent current note 1; RL= ∞−9.2 13 mA

Maximum gain (V

5

= 1.4 V)

P

O

output power THD = 10%; RL=16Ω 3 3.5 − W

THD = 10%; R

L

=8Ω 5 5.5 − W

THD total harmonic distortion P

O

= 0.5 W − 0.3 1 %

G

v(max)

maximum total voltage gain 39.5 40.5 41.5 dB

V

I

input signal handling (RMS value) G

v(max)

= 0 dB; THD < 1% 1.0 −−V

V

no

noise output voltage (RMS value) note 2; f = 500 kHz − 210 −µV
B bandwidth at −1dB − 0.02 to 300 − kHz
SVRR supply voltage ripple rejection note 3 34 38 − dB
∆V

O

 DC output offset voltage V8− v6−0 200 mV

Z

I

input impedance (pin 3) 15 20 25 kΩ

Mute position

V

O

output voltage in mute position note 4; V5≤ 0.4 V;

VI= 1.0 V

− 35 45 µV

DC volume control; note 5
φ gain control 68 73.5 − dB

I

5

control current V5=0V −20 −25 −30 µA