Philips TDA7056AT-N2 Datasheet

DATA SH EET

Product speciﬁcation File under Integrated Circuits, IC01

1998 Feb 23

INTEGRATED CIRCUITS

TDA7056AT

3 W mono BTL audio amplifier with DC volume control

1998 Feb 23 2

Philips Semiconductors Product speciﬁcation

3 W mono BTL audio ampliﬁer with DC volume control

TDA7056AT

FEATURES

• DC volume control

• Few external components

• Mute mode

• Thermal protection

• Short-circuit proof

• No switch-on or switch-off clicks

• Good overall stability

• Low power consumption

• Low HF radiation

• ESD protected on all pins.

GENERAL DESCRIPTION

The TDA7056AT is a mono Bridge-Tied Load (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. The device is contained in a 20-lead small outline 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 Single-Ended (SE) headphone applications.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

supply voltage 4.5 − 18 V

output power VP= 12 V; RL=16Ω 3 3.5 − W

v(max)

maximum total voltage gain VP= 12 V; RL=16Ω 34.5 35.5 36.5 dB

∆G

voltage gain control range 75 80 − dB

q(tot)

total quiescent current VP= 12 V; RL= ∞− 816mA

THD total harmonic distortion P

= 0.5 W − 0.3 1 %

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA7056AT SO20

plastic small outline package with 20 leads; body width 7.5 mm

SOT163-1

1998 Feb 23 3

Philips Semiconductors Product speciﬁcation

3 W mono BTL audio ampliﬁer with DC volume control

TDA7056AT

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

positive input

MGM576

TDA7056AT

I + i

17I − i

STABILIZER

TEMPERATURE

PROTECTION

DC volume control

ref

−

positive output

negative output

power

ground

signal

ground

1 to 3, 8 to 13, 16, 18 to 20

n.c.

1998 Feb 23 4

Philips Semiconductors Product speciﬁcation

3 W mono BTL audio ampliﬁer with DC volume control

TDA7056AT

PINNING

SYMBOL PIN DESCRIPTION

n.c. 1 not connected n.c. 2 not connected n.c. 3 not connected V

4 positive supply voltage

5 positive input GND1 6 signal ground VC 7 DC volume control n.c. 8 not connected n.c. 9 not connected n.c. 10 not connected n.c. 11 not connected n.c. 12 not connected n.c. 13 not connected OUT+ 14 positive output GND2 15 power ground n.c. 16 not connected OUT− 17 negative output n.c. 18 not connected n.c. 19 not connected n.c. 20 not connected

Fig.2 Pin configuration.

handbook, halfpage

n.c. n.c. n.c.

GND1

VC n.c. n.c. n.c.

n.c. n.c. n.c. OUT−

GND2 OUT+

n.c.

n.c. n.c. n.c.

1 2 3 4 5 6 7 8 9

20 19 18 17 16 15 14 13

TDA7056AT

MGM577

1998 Feb 23 5

Philips Semiconductors Product speciﬁcation

3 W mono BTL audio ampliﬁer with DC volume control

TDA7056AT

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

the signal frequency.

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.

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

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 switch-off clicks, low HF radiation and a good overall stability.

Power dissipation

Assume V

= 12 V; RL=16Ω.

The maximum sine wave dissipation is 1.8 W. The R

th vj-a

of the package is 60 K/W.

Therefore T

amb(max)

= 150 − 60 × 1.8=42°C.

LIMITING VALUES

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

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

supply voltage − 18 V

5, 7

input voltage pins 5 and 7 − 5V

ORM

repetitive peak output current − 1.25 A

OSM

non-repetitive peak output current − 1.5 A

tot

total power dissipation T

case

< 60 °C − 1.5 W

amb

operating ambient temperature −40 +85 °C

stg

storage temperature −55 +150 °C

virtual junction temperature − 150 °C

short-circuit time − 1h

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th(j-a)

thermal resistance from junction to ambient in free air 60 K/W

1998 Feb 23 6

Philips Semiconductors Product speciﬁcation

3 W mono BTL audio ampliﬁer with DC volume control

TDA7056AT

CHARACTERISTICS

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

amb

=25°C; unless otherwise speciﬁed (see Fig.14).

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

2. The noise output voltage (V

n(o)(rms)

) 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 (V

ripple

= 200 mV RMS)

is applied to the positive supply rail.

4. The noise output voltage (V

n(o)(rms)

) is measured with Rs=5kΩ unweighted.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

supply voltage 4.5 − 18 V

q(tot)

total quiescent current RL= ∞; note 1 − 816mA

Maximum gain (V

= 1.4 V)

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

THD total harmonic distortion P

= 0.5 W − 0.3 1 %

v(max)

maximum total voltage gain 34.5 35.5 36.5 dB

i(rms)

input signal handling (RMS value) VVC= 0.8 V; THD < 1% 0.5 0.65 − V

n(o)(rms)

noise output voltage (RMS value) f = 500 kHz; note 2 − 210 −µV B bandwidth at −1dB − 0.02 to 300 − kHz SVRR supply voltage ripple rejection note 3 38 46 − dB ∆V

 DC output offset voltage V17− v14−0 150 mV

input impedance (pin 3) 15 20 25 kΩ

Minimum gain (V

= 0.5 V)

voltage gain −−44 − dB V

o(n)(rms)

noise output voltage (RMS value) note 4 − 20 30 µV

Mute position

o(mute)

output voltage in mute position VVC≤ 0.3 V;

VI= 600 mV; note 4

− 35 45 µV

DC volume control

∆G

voltage gain control range 75 80 − dB I

control current VVC=0V 60 70 80 µA

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