TDA7056ATD NXP Semiconductors, TDA7056ATD Datasheet - Page 5

• Manufacturer Part Number: TDA7056ATD
• Description: Audio Amplifiers 3W BTL+DC VOLT CTRL
• Manufacturer: NXP Semiconductors

Specifications of TDA7056ATD

• Product: Class-AB
• Output Power: 3.5 W
• Available Set Gain: 35.5 dB
• Thd Plus Noise: 0.3 %
• Operating Supply Voltage: 5 V, 9 V, 12 V, 15 V
• Supply Current: 8 mA
• Maximum Power Dissipation: 1500 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 16 Ohms
• Input Signal Type: Single
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential
• Supply Type: Single
• Supply Voltage (max): 18 V
• Supply Voltage (min): 4.5 V
• Output Type: 1-Channel Mono
• Package / Case: SO-20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TDA7056AT/N2,512

NXP Semiconductors
FUNCTIONAL DESCRIPTION
The TDA7056AT is a mono BTL output amplifier with DC
volume control. It is designed for use in TVs and monitors
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
TDA7056AT 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
Consequently, a reduced power supply with smaller
capacitors can be used which also 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.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
1998 Feb 23
V
V
I
I
P
T
T
T
t
R
ORM
OSM
sc
the signal frequency.
amb
stg
vj
P
5, 7
tot
3 W mono BTL audio amplifier with DC
volume control
th(j-a)
SYMBOL
SYMBOL
supply voltage
input voltage pins 5 and 7
repetitive peak output current
non-repetitive peak output current
total power dissipation
operating ambient temperature
storage temperature
virtual junction temperature
short-circuit time
thermal resistance from junction to ambient
PARAMETER
PARAMETER
5
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 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, V
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
switch-off clicks, low HF radiation and a good overall
stability.
Power dissipation
Assume V
The maximum sine wave dissipation is 1.8 W.
The R
Therefore T
T
case
th vj-a
< 60 °C
CONDITIONS
in free air
P
CONDITIONS
of the package is 60 K/W.
amb(max)
= 12 V; R
= 150 − 60 × 1.8 = 42 °C.
L
= 16 Ω.
−
−
−
−
−
−40
−55
−
−
MIN.
VALUE
60
Product specification
TDA7056AT
18
5
1.25
1.5
1.5
+85
+150
150
1
MAX.
P
UNIT
and
K/W
V
V
A
A
W
°C
°C
°C
h
UNIT