Philips tda7052b DATASHEETS

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TDA7052B

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

Mono BTL audio amplifier with DC

TDA7052B

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 PARAMETERS CONDITIONS MIN. TYP. MAX. UNIT

V

P

P

O

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

TDA7052B R
TDA7052BT R

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=6V; RL=∞−9.2 13 mA
THD total harmonic distortion

TDA7052B P
TDA7052BT P

GENERAL DESCRIPTION

The TDA7052B and TDA7052BT are 1 W and 0.5 W mono
Bridge-Tied Load (BTL) output amplifiers with DC volume
control.
They have been designed for use in TV and monitors, but
are also suitable for use in battery-fed portable recorders
and radios.

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).

=8Ω 0.9 1.0 − W

L

=16Ω 0.5 0.55 − W

L

= 0.5 W − 0.3 1 %

O

= 0.25 W − 0.3 1 %

O

ORDERING INFORMATION

TYPE

NUMBER

TDA7052B DIP8
TDA7052BT SO8

NAME DESCRIPTION VERSION

plastic dual in-line package; 8 leads (300 mil)
plastic small outline package; 8 leads; body width 3.9 mm

1996 May 28 2

PACKAGE

SOT97-1
SOT96-1

Philips Semiconductors Preliminary specification

Mono BTL audio amplifier with DC volume
control

BLOCK DIAGRAM

handbook, full pagewidth

n.c.

input

DC volume control

7

TDA7052B

TDA7052BT

2

4

V

STABILIZER

ref

TEMPERATURE

PROTECTION

TDA7052B

V

P

1

5I + i

positive output

I – i

8

negative output

PINNING

SYMBOL PIN DESCRIPTION

V

P

1 supply voltage
IN+ 2 input
GND1 3 signal ground
VC 4 DC volume control
OUT+ 5 positive output
GND2 6 power ground
n.c. 7 not connected
OUT− 8 negative output

Fig.1 Block diagram.

handbook, halfpage

V

VC

P

6

power

ground

1
2

TDA7052B

TDA7052BT

3
4

signal

ground

3

IN

GND1

Fig.2 Pin configuration.

MSA704 - 1

MSA705 - 1

8
7
6
5

OUT
n.c.
GND2
OUT

1996 May 28 3

Philips Semiconductors Preliminary specification

Mono BTL audio amplifier with DC volume
control

FUNCTIONAL DESCRIPTION

The TDA7052B and TDA7052BT are mono BTL output
amplifiers with DC volume control which have been
designed for use in TV and monitors but are also suitable
for use in 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 TDA7052B
and TDA7052BT 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 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.

TDA7052B

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 for the TDA7052B that V

= 6 V; RL=8Ω.

P

The maximum sine wave dissipation is 0.9 W.
The R
Therefore T

of the package is 100 K/W.

th j-a

amb(max)

= 150 − 100 × 0.9 = 60 °C.

Assume for the TDA7052BT that VP= 6 V; RL=16Ω.
The maximum sine wave dissipation is 0.46 W.
The R
Therefore T

of the package is 155 K/W.

th j-a

amb(max)

= 150 − 155 × 0.46 = 78 °C.

and

P

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

V

2, 4

I

ORM

I

OSM

P

tot

supply voltage − 18 V
input voltage pins 2 and 4 − 5V
repetitive peak output current − 1.25 A
non-repetitive peak output current − 1.5 A
total power dissipation T

amb

≤ 25 °C
TDA7052B − 1.25 W
TDA7052BT − 0.8 W

T

amb

T

stg

T

vj

T

sc

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

th j-a

thermal resistance from junction to ambient in free air

TDA7052B 100 K/W
TDA7052BT 155 K/W

1996 May 28 4

Philips Semiconductors Preliminary specification

Mono BTL audio amplifier with DC volume

TDA7052B

control

CHARACTERISTICS

=6V; VDC= 1.4 V; f = 1 kHz; RL=8Ω; T

V

P

SYMBOL P ARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

I

q(tot)

Maximum gain (V

P

O

supply voltage 4.5 − 18 V
total quiescent current note 1; RL= ∞−9.2 13 mA

≥ 1.4 V)

4

output power THD = 10%

TDA7052B 0.9 1.0 − W
TDA7052BT 0.5 0.55 − W

THD total harmonic distortion

TDA7052B P
TDA7052BT P

G

v(max)

V

I

V

no

maximum total voltage gain 39.5 40.5 41.5 dB
input signal handling (RMS value) G

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

 DC output offset voltage V8− V5−0 200 mV

∆V

O

Z

I

input impedance (pin 3) 15 20 25 kΩ

Mute position

V

O

output voltage in mute position note 4; V4= 0.4 V ±30 mV;

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

amb

= 0.5 W − 0.3 1 %

O

= 0.25 W − 0.3 1 %

O

= 0 dB; THD < 1% 1.0 −−V

v(max)

− 30 40 µV

VI= 1.0 V
DC volume control; note 5
φ gain control 68 73.5 − dB

I

4

control current V4= 0 V 20 25 30 µA

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.

1996 May 28 5