Philips TDA8542AT-N1 Datasheet

DATA SH EET

Product specification
Supersedes data of 1997 Nov 14
File under Integrated Circuits, IC01

1998 Mar 25

INTEGRATED CIRCUITS

TDA8542AT

2 × 1.5 W BTL audio amplifier

1998 Mar 25 2

Philips Semiconductors Product specification

2 × 1.5 W BTL audio amplifier TDA8542AT

FEATURES

• Flexibility in use

• Few external components

• Low saturation voltage of output stage

• Gain can be fixed with external resistors

• Standby mode controlled by CMOS compatible levels

• Low standby current

• No switch-on/switch-off plops

• High supply voltage ripple rejection

• Protected against electrostatic discharge

• Outputs short-circuit safe to ground, V

CC

and across the

load

• Thermally protected.

GENERAL DESCRIPTION

The TDA8542AT is a two channel audio power amplifier
for an output power of 2 × 1.5 W with an 8 Ω load at a 6 V
supply. The circuit contains two Bridge-Tied Load (BTL)
amplifiers with a complementary PNP-NPN output stage
and standby/mute logic. The TDA8542AT comes in a
20-pin SO package.

APPLICATIONS

• Portable consumer products

• Personal computers

• Motor-driver (servo).

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

supply voltage 2.2 6 18 V

I

q

quiescent current VCC=6V − 15 22 mA

I

stb

standby current −−10 µA

P

o

output power THD = 10%; RL=8Ω; VCC=6V 1 1.5 − W

THD total harmonic distortion P

o

= 0.5 W − 0.15 − %

SVRR supply voltage ripple rejection 50 −−dB

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA8542AT SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1

1998 Mar 25 3

Philips Semiconductors Product specification

2 × 1.5 W BTL audio amplifier TDA8542AT

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MGM211

STANDBY/MUTE LOGIC

R

R

20 kΩ

20 kΩ

INL−
INL+

V

CCL

OUTL−

OUTL+

−

−
+

−

−
+

STANDBY/MUTE LOGIC

R

R

20 kΩ

20 kΩ

INR−
INR+

V

CCR

SVR

MODE

OUTR−

OUTR+

−

−
+

−

−
+

BTL/SE

LGND

RGND

V

CCL

V

CCR

19

12

18

3

13

8

29

17
16

14
15

5

4
6

TDA8542AT

n.c.

7

GND1GND10GND11GND

20

1998 Mar 25 4

Philips Semiconductors Product specification

2 × 1.5 W BTL audio amplifier TDA8542AT

PINNING

Note

1. Pins 1, 10, 11 and 20 are connected to the leadframe
and also to the substrate. They may be kept floating.
When connected to the ground-plane the PCB can be
used as heatsink.

SYMBOL PIN DESCRIPTION

GND 1 ground; note 1
LGND 2 ground, left channel
OUTL+ 3 positive loudspeaker terminal,

left channel

MODE 4 operating mode select (standby,

mute, operating)

SVR 5 half supply voltage, decoupling

ripple rejection

BTL/SE 6 BTL loudspeaker or SE

headphone operation
n.c. 7 not connected
OUTR+ 8 positive loudspeaker terminal,

right channel
RGND 9 ground, right channel
GND 10 ground; note 1
GND 11 ground; note 1
V

CCR

12 supply voltage, right channel

OUTR− 13 negative loudspeaker terminal,

right channel
INR− 14 negative input, right channel
INR+ 15 positive input, right channel
INL+ 16 positive input, left channel
INL− 17 negative input, left channel
OUTL− 18 negative loudspeaker terminal,

left channel
V

CCL

19 supply voltage, left channel

GND 20 ground; note 1

Fig.2 Pin configuration.

handbook, halfpage

GND

LGND

OUTL+

MODE

SVR

BTL/SE

n.c.

OUTR+

RGND

GND

GND
V

CCL

OUTL−
INL−

INR+
INR−

INL+

OUTR−
V

CCR

GND

1
2
3
4
5
6
7
8
9

10

11

12

20
19
18
17
16
15
14
13

TDA8542AT

MGM212

1998 Mar 25 5

Philips Semiconductors Product specification

2 × 1.5 W BTL audio amplifier TDA8542AT

FUNCTIONAL DESCRIPTION

The TDA8542AT is a 2 × 1.5 W BTL audio power amplifier
capable of delivering 2 × 1.5 W output power to an 8 Ω
load at THD = 10% using a 6 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 6 V
supply voltage and an 8 Ω loudspeaker an output power of

1.5 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.

Headphone connection

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.14). In this case the BTL/SE pin must be
either on a logic HIGH level or not connected at all.

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

⁄2VCC (see Fig.14).

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.

LIMITING VALUES

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

QUALITY SPECIFICATION

In accordance with

“SNW-FQ-611-E”

.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

supply voltage operating −0.3 +18 V

V

I

input voltage −0.3 VCC+ 0.3 V

I

ORM

repetitive peak output current − 1A

T

stg

storage temperature non-operating −55 +150 °C

T

amb

operating ambient temperature −40 +85 °C

V

sc

AC and DC short-circuit safe voltage − 10 V

P

tot

total power dissipation − 2.2 W

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(j-a)

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

1998 Mar 25 6

Philips Semiconductors Product specification

2 × 1.5 W BTL audio amplifier TDA8542AT

DC CHARACTERISTICS

V

CC

=6V; T

amb

=25°C; RL=8Ω; V

MODE

= 0 V; measured in test circuit Fig.3; unless otherwise specified.

Notes

1. With a load connected at the outputs the quiescent current will increase, the maximum of this increase being equal
to the DC output offset voltage divided by R

L

.

2. The DC output voltage with respect to ground is approximately1⁄2VCC.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

supply voltage operating 2.2 6 18 V

I

q

quiescent current RL= ∞; note 1 − 15 22 mA

I

stb

standby current V

MODE=VCC

−−10 µA

V

O

DC output voltage note 2 − 2.2 − V

V

OUT+

− V

OUT−

 differential output voltage offset −−50 mV

I

IN+

, I

IN−

input bias current −−500 nA

V

MODE

input voltage mode select operating 0 − 0.5 V

mute 1.5 − V

CC

− 1.5 V

standby V

CC

− 0.5 − V

CC

V

I

MODE

input current mode select 0 < V

MODE<VCC

−−20 µA

V

BTL/SE

input voltage BTL/SE pin single-ended 0 − 0.6 V

BTL 2 − V

CC

V

I

BTL/SE

input current BTL/SE pin V

BTL/SE

=0 −−100 µA