Philips TDA8542AT Datasheet
INTEGRATED CIRCUITS
DATA SH EET
TDA8542AT
2 × 1.5 W BTL audio amplifier
Product specification
Supersedes data of 1997 Nov 14
File under Integrated Circuits, IC01
1998 Mar 25
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
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.
• 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
• Motor-driver (servo).
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 6 18 V
quiescent current VCC=6V − 15 22 mA
standby current −−10 µA
output power THD = 10%; RL=8Ω; VCC=6V 1 1.5 − W
= 0.5 W − 0.15 − %
o
SVRR supply voltage ripple rejection 50 −−dB
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA8542AT SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1998 Mar 25 2
Philips Semiconductors Product specification
2 × 1.5 W BTL audio amplifier TDA8542AT
BLOCK DIAGRAM
V
handbook, full pagewidth
CCL
V
CCR
12
19
INL−
INL+
INR−
INR+
SVR
−
17
16
V
CCL
−
+
R
R
18
OUTL−
−
20 kΩ
−
3
OUTL+
+
20 kΩ
STANDBY/MUTE LOGIC
14
15
5
V
−
+
CCR
20 kΩ
20 kΩ
−
TDA8542AT
R
−
−
+
13
OUTR−
R
8
OUTR+
MODE
BTL/SE
4
6
7
n.c.
STANDBY/MUTE LOGIC
GND1GND10GND11GND
Fig.1 Block diagram.
1998 Mar 25 3
LGND
29
RGND
MGM211
20
Philips Semiconductors Product specification
2 × 1.5 W BTL audio amplifier TDA8542AT
PINNING
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
handbook, halfpage
GND
1
LGND
2
OUTL+
BTL/SE
OUTR+
MODE
SVR
n.c.
RGND
GND
3
4
5
TDA8542AT
6
7
8
9
10
MGM212
Fig.2 Pin configuration.
20
19
18
17
16
15
14
13
12
11
GND
V
CCL
OUTL−
INL−
INL+
INR+
INR−
OUTR−
V
CCR
GND
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.
1998 Mar 25 4
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).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
CC
V
I
I
ORM
T
stg
T
amb
V
sc
P
tot
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 − 2.2 W
QUALITY SPECIFICATION
In accordance with
“SNW-FQ-611-E”
.
THERMAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS VALUE UNIT
R
th(j-a)
thermal resistance from junction to ambient in free air 60 K/W
1998 Mar 25 5
Philips Semiconductors Product specification
2 × 1.5 W BTL audio amplifier TDA8542AT
DC CHARACTERISTICS
V
=6V; 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
BTL/SE
OUT+
, I
IN−
MODE
BTL/SE
− V
=25°C; RL=8Ω; V
amb
= 0 V; measured in test circuit Fig.3; unless otherwise specified.
MODE
supply voltage operating 2.2 6 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
input current BTL/SE pin V
BTL 2 − V
=0 −−100 µA
BTL/SE
CC
− 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 approximately1⁄2VCC.
1998 Mar 25 6
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