tda8542(1).pdf

INTEGRATED CIRCUITS

DATA SHEET

1 W BTL audio amplifier

Product speciﬁcation

Supersedes data of 1997 Feb 19

File under Integrated Circuits, IC01

1998 Apr 01

TDA8542

Philips Semiconductors

Product speciﬁcation

1 W BTL audio ampliﬁer

TDA8542

FEATURES

APPLICATIONS

Flexibility in use

Portable consumer products

Few external components

Personal computers

Low saturation voltage of output stage

Motor-driver (servo).

Gain can be fixed with external resistors

Standby mode controlled by CMOS compatible levels

GENERAL DESCRIPTION

Low standby current

The TDA8542(T) is a two channel audio power amplifier

for an output power of 2

No switch-on/switch-off plops

load at a 5 V

supply. The circuit contains two BTL amplifiers with a

complementary PNP-NPN output stage and standby/mute

logic. The TDA8542T comes in a 16 pin SO package and

the TDA8542 in a 16 pin DIP package.

1 W with an 8

High supply voltage ripple rejection

Protected against electrostatic discharge

Outputs short-circuit safe to ground, V CC and across the

load

Thermally protected.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

V CC

supply voltage

2.2

I q

quiescent current

V CC =5V

I stb

standby current

P o

output power

THD = 10%; R L =8

; V CC =5V 1

1.2

THD

total harmonic distortion

P o = 0.5 W

0.15

SVRR

supply voltage ripple rejection

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA8542T

SO16L plastic small outline package; 16 leads; body width 7.5 mm

SOT162-1

TDA8542

DIP16 plastic dual in-line package; 16 leads (300 mil); long body

SOT38-1

1998 Apr 01

Philips Semiconductors

Product speciﬁcation

1 W BTL audio ampliﬁer

TDA8542

BLOCK DIAGRAM

handbook, full pagewidth

V CCL V CCR

INL

OUTL -

INL

V CCL

20 k W

OUTL +

20 k

STANDBY/MUTE LOGIC

TDA8542

INR -

INR

OUTR -

V CCR

20 k

OUTR

SVR

20 k

MODE

STANDBY/MUTE LOGIC

BTL/SE

MGB975

LGND RGND

Fig.1 Block diagram.

1998 Apr 01

Philips Semiconductors

Product speciﬁcation

1 W BTL audio ampliﬁer

TDA8542

PINNING

FUNCTIONAL DESCRIPTION

SYMBOL

DESCRIPTION

The TDA8542(T) is a 2 ´ 1 W BTL audio power amplifier

capable of delivering 2 ´ 1 W output power to an 8 W 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 dB to 30 dB by external feedback

resistors.

LGND

1 ground, left channel

OUTL+

2 positive loudspeaker terminal,

left channel

MODE

3 operating mode select (standby,

mute, operating)

SVR

4 half supply voltage, decoupling

ripple rejection

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 an 8

BTL/SE

5 BTL loudspeaker or SE

headphone operation

n.c.

6 not connected

OUTR+

7 positive loudspeaker terminal,

right channel

RGND

8 ground, right channel

V CCR

9 supply voltage, right channel

loudspeaker an output power of

1 W can be delivered.

OUTR

10 negative loudspeaker terminal,

right channel

Mode select pin

INR -

11 negative input, right channel

INR+

12 positive input, right channel

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

consumption) if the voltage at the MODE pin is

>(V CC -

INL+

13 positive input, left channel

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 V CC -

INL -

14 negative input, left channel

OUTL -

15 negative loudspeaker terminal,

left channel

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.

V CCL

16 supply voltage, left channel

Headphone connection

handbook, halfpage

LGND

V CCL

A headphone can be connected to the amplifier using two

coupling capacitors for each channel. The common

GND pin of the headphone is connected to the ground of

the amplifier (see Fig.13). In this case the BTL/SE pin must

be either on a logic HIGH level or not connected at all.

OUTL

OUTL -

MODE

INL -

The two coupling capacitors can be omitted if it is allowed

to connect the common GND pin of the headphone jack

not to ground, but to a voltage level of 1

SVR

INL

TDA8542

¤ 2 V CC (see Fig.13).

In this case the BTL/SE pin must be either on a logic LOW

level or connected to ground. If the BTL/SE pin is on a

LOW level, the power amplifier for the positive

loudspeaker terminal is always in mute condition.

BTL/SE

INR +

n.c.

INR

OUTR

RGND

V CCR

MGB974

Fig.2 Pin configuration.

1998 Apr 01

Philips Semiconductors

Product speciﬁcation

1 W BTL audio ampliﬁer

TDA8542

LIMITING VALUES

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

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

V CC

supply voltage

operating

0.3

+18

V I

input voltage

0.3

V CC + 0.3 V

I ORM

repetitive peak output current

T stg

storage temperature

non-operating

+150

T amb

operating ambient temperature

+85

V psc

AC and DC short-circuit safe voltage

P tot

total power dissipation

SO16L

1.2

DIP16

2.2

QUALITY SPECIFICATION

In accordance with “SNW-FQ-611-E”. The number of the quality specification can be found in the “Quality Reference

Handbook”. The handbook can be ordered using the code 9397 750 00192.

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

VALUE

UNIT

R th j-a

thermal resistance from junction to ambient in free air:

TDA8542T (SO16L)

100

K/W

TDA8542 (DIP16)

K/W

1998 Apr 01

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