NXP Semiconductors
Product specification
Mono BTL audio amplifier with DC 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
V
P
P
O
PARAMETERS
supply voltage
output power
TDA7052B
TDA7052BT
G
v(max)
φ
I
q(tot)
THD
maximum total voltage gain
gain control
total quiescent current
total harmonic distortion
TDA7052B
TDA7052BT
ORDERING INFORMATION
TYPE
NUMBER
TDA7052B
TDA7052BT
PACKAGE
NAME
DIP8
SO8
DESCRIPTION
plastic dual in-line package; 8 leads (300 mil)
plastic small outline package; 8 leads; body width 3.9 mm
P
O
= 0.5 W
P
O
= 0.25 W
−
−
0.3
0.3
V
P
= 6 V; R
L
=
∞
V
P
= 6 V
R
L
= 8
Ω
R
L
= 16
Ω
0.9
0.5
39.5
68
−
1.0
0.55
40.5
73.5
9.2
CONDITIONS
MIN.
4.5
−
TYP.
GENERAL DESCRIPTION
TDA7052B
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).
MAX.
18
−
−
41.5
−
13
1
1
UNIT
V
W
W
dB
dB
mA
%
%
VERSION
SOT97-1
SOT96-1
1997 Aug 15
2
NXP Semiconductors
Product 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
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 for the TDA7052B that V
P
= 6 V; R
L
= 8
Ω.
The maximum sine wave dissipation is 0.9 W.
The R
th j-a
of the package is 100 K/W.
Therefore T
amb(max)
= 150
−
100
×
0.9 = 60
°C.
Assume for the TDA7052BT that V
P
= 6 V; R
L
= 16
Ω.
The maximum sine wave dissipation is 0.46 W.
The R
th j-a
of the package is 155 K/W.
Therefore T
amb(max)
= 150
−
155
×
0.46 = 78
°C.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
V
P
V
2, 4
I
ORM
I
OSM
P
tot
supply voltage
input voltage pins 2 and 4
repetitive peak output current
non-repetitive peak output current
total power dissipation
TDA7052B
TDA7052BT
T
amb
T
stg
T
vj
T
sc
operating ambient temperature
storage temperature
virtual junction temperature
short-circuit time
T
amb
≤
25
°C
−
−
−40
−55
−
−
1.25
0.8
+85
+150
+150
1
W
W
°C
°C
°C
h
PARAMETER
CONDITIONS
−
−
−
−
MIN.
18
5
1.25
1.5
MAX.
V
V
A
A
UNIT
THERMAL CHARACTERISTICS
SYMBOL
R
th j-a
TDA7052B
TDA7052BT
1997 Aug 15
4
PARAMETER
thermal resistance from junction to ambient in free air
100
155
K/W
K/W
VALUE
UNIT
NXP Semiconductors
Product specification
Mono BTL audio amplifier with DC volume
control
CHARACTERISTICS
V
P
= 6 V; V
DC
= 1.4 V; f = 1 kHz; R
L
= 8
Ω;
T
amb
= 25
°C;
unless otherwise specified (see Fig.13).
SYMBOL
Supply
V
P
I
q(tot)
supply voltage
total quiescent current
note 1; R
L
=
∞
4.5
−
−
9.2
PARAMETER
CONDITIONS
MIN.
TYP.
TDA7052B
MAX.
UNIT
18
13
V
mA
Maximum gain (V
4
= 1.4 V)
P
O
output power
TDA7052B
TDA7052BT
THD
total harmonic distortion
TDA7052B
TDA7052BT
G
v(max)
V
I
V
no
B
SVRR
⎪ΔV
O
⎪
Z
I
V
O
maximum total voltage gain
input signal handling (RMS value) G
v(max)
= 0 dB; THD
<
1%
noise output voltage (RMS value)
bandwidth
supply voltage ripple rejection
DC output offset voltage
input impedance (pin 3)
note 4; V
4
≤
0.4 V;
V
I
= 1.0 V
note 2; f = 500 kHz
at
−1
dB
note 3
⎪V
8
−
V
5
⎪
P
O
= 0.5 W
P
O
= 0.25 W
−
−
39.5
1.0
−
−
48
−
15
−
0.3
0.3
40.5
−
210
60
0
20
−
1
1
41.5
−
−
−
200
25
%
%
dB
V
μV
kHz
dB
mV
kΩ
μV
THD = 10%
0.9
0.5
1.0
0.55
−
−
W
W
0.02 to 300
−
Mute position
output voltage in mute position
30
DC volume control;
note 5
φ
I
4
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 R
S
= 0
Ω
and B = 5 kHz.
3. The ripple rejection is measured with R
S
= 0
Ω
and f = 100 Hz to 10 kHz. The ripple voltage V
R
of 200 mV
(RMS value) is applied to the positive supply rail.
4. The noise output voltage (RMS value) is measured with R
S
= 5 kΩ 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.
gain control
control current
V
4
= 0 V
68
−20
73.5
−25
−
−30
dB
μA
1997 Aug 15
5
Electronics Design Contest
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