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NXP

TDA7056A Datasheet

3 W BTL mono audio output amplifier with DC volume control


TDA7056A Datasheet Preview


INTEGRATED CIRCUITS
DATA SHEET
TDA7056A
3 W BTL mono audio output
amplifier with DC volume control
Product specificiation
File under Integrated Circuits, IC01
July 1994
Page 1

Philips Semiconductors
3 W BTL mono audio output amplifier
with DC volume control
Product specificiation
TDA7056A
FEATURES
DC volume control
Few external components
Mute mode
Thermal protection
Short-circuit proof
No switch-on and off clicks
Good overall stability
Low power consumption
Low HF radiation
ESD protected on all pins.
GENERAL DESCRIPTION
The TDA7056A is a mono BTL output amplifier with DC
volume control. It is designed for use in TV and monitors,
but also suitable for battery-fed portable recorders and
radios.
Missing Current Limiter (MCL)
A MCL protection circuits 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).
QUICK REFERENCE DATA
SYMBOL
VP
PO
Gv
φ
IP
THD
PARAMETER
positive supply voltage range
output power
voltage gain
gain control range
total quiescent current
total harmonic distortion
CONDITIONS
RL = 16 ; VP = 12 V
VP = 12 V; RL =
VP = 0.5 W
MIN.
4.5
3
34.5
75
TYP.
3.5
35.5
80
8
0.3
MAX. UNIT
18 V
W
36.5 dB
dB
16 mA
1%
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
TDA7056A
PINS
9
Note
1. SOT110-1; 1996 August 21.
PIN POSITION
SIL
PACKAGE
MATERIAL
plastic
CODE
SOT110
July 1994
2
Page 2

Philips Semiconductors
3 W BTL mono audio output amplifier with
DC volume control
Product specificiation
TDA7056A
handbook, full pagewidth
n.c. 1
n.c. 9
positive input
DC volume control
3
5
TDA7056A
VP
2
I+i
6 positive output
I –i
8 negative output
STABILIZER TEMPERATURE
Vref PROTECTION
47
signal
ground
power
ground
MGA072 - 1
Fig.1 Block diagram.
PINNING
SYMBOL
n.c.
VP
VI
GND1
VC
OUT+
GND2
OUT
n.c.
PIN DESCRIPTION
1 not connected
2 positive supply voltage
3 voltage input
4 signal ground
5 DC volume control
6 positive output
7 power ground
8 negative output
9 not connected
handbook, halfpage
n.c. 1
VP 2
VI 3
GND1 4
VC 5 TDA7056A
OUT+ 6
GND2 7
OUT8
n.c. 9
MGA071
Fig.2 Pin configuration.
July 1994
3
Page 3

Philips Semiconductors
3 W BTL mono audio output amplifier with
DC volume control
Product specificiation
TDA7056A
FUNCTIONAL DESCRIPTION
The TDA7056A is a mono BTL output amplifier with DC
volume control, designed for use in TV and monitor but
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
capacitor to keep the offset voltage low.
In the TDA7056A the DC volume stage is integrated into
the input stage so that coupling capacitors are not required
and a low offset voltage is maintained.
At the same time 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
Thus, a reduced power supply and smaller capacitors can
be used which results in cost savings.
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 35.5 dB. The
DC volume control stage has a logarithmic control
characteristic.
The total gain can be controlled from 35.5 dB to 44 dB.
If the DC volume control voltage is below 0.3 V, the device
switches to the mute mode.
The amplifier is short-circuit proof to ground, VP and
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 off clicks, low
HF radiation and a good overall stability.
LIMITING VALUES
In accordance with the Absolute Maximum System (IEC 134).
SYMBOL
PARAMETER
CONDITIONS
VP
IORM
IOSM
Ptot
Tamb
Tstg
Tvj
Tsc
V3
V5
supply voltage range
repetitive peak output current
non repetitive peak output current
total power dissipation
operating ambient temperature range
storage temperature range
virtual junction temperature
short-circuit time
input voltage pin 3
input voltage pin 5
Tcase < 60 °C
MIN.
40
55
MAX.
18
1.25
1.5
9
+85
+150
+150
1
8
8
UNIT
V
A
A
W
°C
°C
°C
hr
V
V
THERMAL RESISTANCE
SYMBOL
Rth j-a
Rth j-c
PARAMETER
from junction to ambient in free air
from junction to case
THERMAL RESISTANCE
55 K/W
10 K/W
Note to the thermal resistance
VP = 12 V; RL = 16 ; The maximum sine-wave dissipation is = 1.8 W. The Rth vj-a of the package is 55 K/W;
Tamb (max) = 150 55 x 1.8 = 51 °C
July 1994
4
Page 4
Part Number TDA7056A
Manufactur NXP
Description 3 W BTL mono audio output amplifier with DC volume control
Total Page 9 Pages
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