Philips TDA8542T Datasheet
INTEGRATED CIRCUITS
DATA SH EET
TDA8542
2 × 1 W BTL audio amplifier
Product specification
Supersedes data of 1997 Feb 19
File under Integrated Circuits, IC01
1998 Apr 01
Philips Semiconductors Product specification
2 × 1 W BTL audio amplifier TDA8542
FEATURES
• Flexibility in use
• Few external components
• Low saturation voltage of output stage
APPLICATIONS
• Portable consumer products
• Personal computers
• Motor-driver (servo).
• 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
and across the
CC
GENERAL DESCRIPTION
The TDA8542(T) is a two channel audio power amplifier
for an output power of 2 × 1 W with an 8 Ω 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.
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 − 15 22 mA
standby current −−10 µA
output power THD = 10%; RL=8Ω; VCC=5V 1 1.2 − W
= 0.5 W − 0.15 − %
o
SVRR supply voltage ripple rejection 50 −−dB
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
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 2
Philips Semiconductors Product specification
2 × 1 W BTL audio amplifier TDA8542
BLOCK DIAGRAM
V
handbook, full pagewidth
CCL
V
CCR
9
16
INL−
INL+
INR−
INR+
SVR
−
14
13
V
CCL
−
+
R
R
15
OUTL−
−
20 kΩ
−
2
OUTL+
+
20 kΩ
STANDBY/MUTE LOGIC
11
12
4
V
−
+
CCR
20 kΩ
20 kΩ
−
TDA8542
R
−
−
+
10
OUTR−
R
7
OUTR+
MODE
BTL/SE
3
5
STANDBY/MUTE LOGIC
Fig.1 Block diagram.
1998 Apr 01 3
LGND
18
MGB975
RGND
Philips Semiconductors Product specification
2 × 1 W BTL audio amplifier TDA8542
PINNING
SYMBOL PIN DESCRIPTION
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
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
OUTR− 10 negative loudspeaker terminal,
right channel
INR− 11 negative input, right channel
INR+ 12 positive input, right channel
INL+ 13 positive input, left channel
INL− 14 negative input, left channel
OUTL− 15 negative loudspeaker terminal,
left channel
V
CCL
16 supply voltage, left channel
FUNCTIONAL DESCRIPTION
The TDA8542(T) is a 2 × 1 W BTL audio power amplifier
capable of delivering 2 × 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 a 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 the standby mode (with a very low current
consumption) if the voltage at the MODE pin is
>(V
− 0.5 V), or if this pin is floating. At a MODE voltage
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
LGND
OUTL+
MODE
SVR
BTL/SE
n.c.
OUTR+
RGND
1
2
3
4
5
6
7
8
TDA8542
MGB974
16
15
14
13
12
11
10
9
V
CCL
OUTL−
INL−
INL+
INR+
INR−
OUTR−
V
CCR
Fig.2 Pin configuration.
1998 Apr 01 4
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.13). 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.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.
Philips Semiconductors Product specification
2 × 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
V
I
I
ORM
T
stg
T
amb
V
psc
P
tot
QUALITY SPECIFICATION
supply voltage operating −0.3 +18 V
input voltage −0.3 VCC+ 0.3 V
repetitive peak output current − 1A
storage temperature non-operating −55 +150 °C
operating ambient temperature −40 +85 °C
AC and DC short-circuit safe voltage − 10 V
total power dissipation SO16L − 1.2 W
DIP16 − 2.2 W
In accordance with
Handbook”
. The handbook can be ordered using the code 9397 750 00192.
“SNW-FQ-611-E”
. The number of the quality specification can be found in the
“Quality Reference
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) 55 K/W
1998 Apr 01 5
Philips Semiconductors Product specification
2 × 1 W BTL audio amplifier TDA8542
DC CHARACTERISTICS
V
=5V; T
CC
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
CC
I
q
I
stb
V
O
V
I
IN+
V
I
MODE
V
I
BS
OUT+
, I
MODE
BS
− V
IN−
=25°C; RL=8Ω; V
amb
= 0 V; measured in test circuit Fig.3; unless otherwise specified.
MODE
supply voltage operating 2.2 5 18 V
quiescent current RL= ∞; note 1 − 15 22 mA
standby current V
MODE=VCC
−−10 µA
DC output voltage note 2 − 2.2 − V
differential output voltage offset −−50 mV
OUT−
input bias current −−500 nA
input voltage mode select operating 0 − 0.5 V
mute 1.5 − V
standby V
input current mode select 0 < V
MODE<VCC
− 0.5 − V
CC
−−20 µA
CC
CC
input voltage BTL/SE pin single-ended 0 − 0.6 V
BTL 2 − V
CC
input current BTL/SE pin VBS=0 −−100 µA
− 1.5 V
V
V
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 approximately 0.5 × VCC.
1998 Apr 01 6
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