TDA8542TS datasheet(4/20 Pages) PHILIPS

4 / 20 page

1998 Mar 25

Philips Semiconductors

Product speciﬁcation

× 0.7 W BTL audio ampliﬁer

TDA8542TS

PINNING

SYMBOL

DESCRIPTION

LGND

ground, left channel

n.c.

not connected

OUTL+

positive loudspeaker terminal,

left channel

MODE

operating mode select (standby,

mute, operating)

SVR

half supply voltage, decoupling

ripple rejection

BTL/SE

BTL loudspeaker or SE

headphone operation

n.c.

not connected

OUTR+

positive loudspeaker terminal,

right channel

n.c.

not connected

RGND

ground, right channel

VCCR

supply voltage, right channel

n.c.

not connected

OUTR

−

negative loudspeaker terminal,

right channel

INR

−

negative input, right channel

INR+

positive input, right channel

INL+

positive input, left channel

INL

−

negative input, left channel

OUTL

−

negative loudspeaker terminal,

left channel

n.c.

not connected

VCCL

supply voltage, left channel

Fig.2 Pin configuration.

handbook, halfpage

TDA8542TS

MBK453

LGND

n.c.

OUTL

MODE

SVR

BTL/SE

n.c.

OUTR

n.c.

RGND

VCCL

n.c.

OUTL

−

INL

−

INL

INR

−

OUTR

−

n.c.

VCCR

FUNCTIONAL DESCRIPTION

The TDA8542TS is a 2

× 0.7 W BTL audio power amplifier

capable of delivering 2

× 0.7 W output power to a 16 Ω

load at THD = 10% using a 5 V power supply. Using the

MODE pin the device can be switched to standby and

mute condition. The device is protected by an internal

thermal shutdown protection mechanism. The gain can be

set within a range from 6 to 30 dB by external feedback

resistors.

Power ampliﬁer

The power amplifier is a Bridge-Tied Load (BTL) amplifier

with a complementary PNP-NPN output stage.

The voltage loss on the positive supply line is the

saturation voltage of a PNP power transistor, on the

negative side the saturation voltage of a NPN power

transistor. The total voltage loss is <1 V and with a 5 V

supply voltage and with a 16

Ω loudspeaker an output

power of 0.7 W can be delivered.

Mode select pin

The device is in the standby mode (with a very low current

consumption) if the voltage at the MODE pin is

>(VCC − 0.5 V), or if this pin is floating. At a MODE voltage

level of less than 0.5 V the amplifier is fully operational.

In the range between 1.5 V and VCC − 1.5 V the amplifier

is in mute condition. The mute condition is useful to

suppress plop noise at the output caused by charging of

the input capacitor.

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