Philips tda8541 DATASHEETS

INTEGRATED CIRCUITS

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TDA8541

1 W BTL audio amplifier

Preliminary specification
Supersedes data of 1996 Apr 11
File under Integrated Circuits, IC01

1996 May 06

Philips Semiconductors Preliminary specification

1 W BTL audio amplifier TDA8541

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

GENERAL DESCRIPTION

The TDA8541(T) is a one channel audio power amplifier
for an output power of 1 W with an 8 Ω load at a 5 V
supply. The circuit contains a BTL amplifier with a
complementary PNP-NPN output stage and standby/mute
logic. The TDA8541T comes in an 8 pin SO package and
the TDA8541 in an 8 pin DIP package.

• 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

APPLICATIONS

• Portable consumer products

• Personal computers

• Telephony.

load

• Thermally protected.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

I

q

I

stb

P

o

THD total harmonic distortion P

supply voltage 2.2 5 18 V
quiescent current VCC=5V − 812mA
standby current −−10 µA
output power THD = 10%; RL=8Ω; VCC=5V 1 −−W

= 0.5 W − 0.15 − %

o

SVRR supply voltage ripple rejection 50 −−dB

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA8541T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
TDA8541 DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1

1996 May 06 2

Philips Semiconductors Preliminary specification

1 W BTL audio amplifier TDA8541

BLOCK DIAGRAM

handbook, halfpage

TDA8541

R

−

−
+

5

OUT−

R

8

OUT+

7

GND

MGB972


IN−
IN+

V

CC

SVR

MODE

−

4

−

3

+

6

20 kΩ

2

20 kΩ

1

STANDBY/MUTE LOGIC

Fig.1 Block diagram.

PINNING

SYMBOL PIN DESCRIPTION

MODE 1 operating mode select

(standby, mute, operating)

SVR 2 half supply voltage, decoupling

ripple rejection
IN+ 3 positive input
IN− 4 negative input
OUT− 5 negative loudspeaker terminal
V

CC

6 supply voltage
GND 7 ground
OUT+ 8 positive loudspeaker terminal

FUNCTIONAL DESCRIPTION

The TDA8541(T) is a 1 W BTL audio power amplifier
capable of delivering 1 W output power to an 8 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 dB 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 an NPN power transistor. The total
voltage loss is <1 V and with a 5 V supply voltage and an
8 Ω loudspeaker an output power of 1 W can be delivered.

Mode select pin

The device is in standby mode (with a very low current
consumption) if the voltage at the MODE pin is

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

>(V

CC

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.

handbook, halfpage

MODE

IN+
IN−

Fig.2 Pin configuration.

1996 May 06 3

1
2
3
4

TDA8541

MGB971

OUT+

8

GNDSVR

7

V

6

CC

OUT−

5