TDA8542TS.PDF

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2 x 0.7 W BTL audio amplifier
INTEGRATED CIRCUITS
DATA SHEET
TDA8542TS
2
0.7 W BTL audio amplifier
Product specification
Supersedes data of 1997 Nov 17
File under Integrated Circuits, IC01
1998 Mar 25
´
11038080.034.png
Philips Semiconductors
Product specification
2
´
0.7 W BTL audio amplifier
TDA8542TS
FEATURES
GENERAL DESCRIPTION
·
Flexibility in use
The TDA8542TS is a two channel audio power amplifier
for an output power of 2 ´ 0.7 W with a 16 W load at a 5 V
supply. At a low supply voltage of 3.3 V an output power of
0.6 W with an 8
·
Few external components
·
Low saturation voltage of output stage
load can be obtained. The circuit
contains two Bridge-Tied Load (BTL) amplifiers with a
complementary PNP-NPN output stage and standby/mute
logic. The TDA8542TS is available in a SSOP20 package.
W
·
Gain can be fixed with external resistors
·
Standby mode controlled by CMOS compatible levels
·
Low standby current
·
No switch-on/switch-off plops
APPLICATIONS
·
·
High supply voltage ripple rejection
Portable consumer products
·
Protected against electrostatic discharge
·
Outputs short-circuit safe to ground, V CC and across the
load
·
Personal computers
·
Motor-driver (servo).
·
Thermally protected.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V CC
supply voltage
2.2
5
18
V
I q
quiescent current
V CC =5V
-
15
22
mA
I stb
standby current
-
-
10
m
A
P o
output power
THD = 10%; R L =8
; V CC = 3.3 V 0.45
0.55
-
W
THD = 10%; R L =16 W ; V CC = 5 V 0.6
0.7
-
W
THD
total harmonic distortion
P o = 0.4 W
-
0.15
-
%
SVRR
supply voltage ripple rejection
50
-
-
dB
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8542TS SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm
SOT266-1
1998 Mar 25
2
W
11038080.035.png
Philips Semiconductors
Product specification
2
´
0.7 W BTL audio amplifier
TDA8542TS
BLOCK DIAGRAM
handbook, full pagewidth
V CCL V CCR
20
11
INL
-
17
16
-
-
+
18
OUTL
-
INL
+
R
V CCL
2
R
n.c.
7
n.c.
9
n.c.
-
-
+
12
n.c.
20 k W
3
19
OUTL
+
n.c.
20 k
W
STANDBY/MUTE LOGIC
-
-
+
TDA8542TS
INR -
INR +
14
13
OUTR -
15
R
V CCR
R
20 k
W
-
-
+
8
OUTR
+
5
SVR
20 k W
MODE
4
6
STANDBY/MUTE LOGIC
BTL/SE
110
MBK445
LGND RGND
Fig.1 Block diagram.
1998 Mar 25
3
11038080.036.png 11038080.037.png 11038080.001.png 11038080.002.png 11038080.003.png 11038080.004.png 11038080.005.png 11038080.006.png 11038080.007.png 11038080.008.png 11038080.009.png 11038080.010.png 11038080.011.png 11038080.012.png 11038080.013.png 11038080.014.png 11038080.015.png 11038080.016.png
Philips Semiconductors
Product specification
2
´
0.7 W BTL audio amplifier
TDA8542TS
PINNING
SYMBOL
PIN
DESCRIPTION
LGND
1 ground, left channel
n.c.
2 not connected
OUTL+
3 positive loudspeaker terminal,
left channel
MODE
4 operating mode select (standby,
mute, operating)
handbook, halfpage
SVR
5 half supply voltage, decoupling
ripple rejection
LGND
1
20
V CCL
n.c.
2
19
n.c.
BTL/SE
6 BTL loudspeaker or SE
headphone operation
OUTL +
3
18
OUTL -
n.c.
7 not connected
MODE
4
17
INL
-
OUTR+
8 positive loudspeaker terminal,
right channel
SVR
5
16
INL
+
TDA8542TS
BTL/SE
6
15
INR
+
n.c.
9 not connected
n.c.
7
14
INR
-
RGND
10 ground, right channel
OUTR +
8
13
OUTR -
V CCR
11 supply voltage, right channel
n.c.
12 not connected
n.c.
9
12
n.c.
OUTR
-
13 negative loudspeaker terminal,
right channel
RGND
10
11
V CCR
MBK453
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
n.c.
19 not connected
Fig.2 Pin configuration.
V CCL
20 supply voltage, left channel
FUNCTIONAL DESCRIPTION
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 with a 16
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 to 30 dB by external feedback
resistors.
´
0.7 W output power to a 16
loudspeaker an output
power of 0.7 W can be delivered.
W
Mode select pin
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 - 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.
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
1998 Mar 25
4
The TDA8542TS is a 2 ´ 0.7 W BTL audio power amplifier
capable of delivering 2
The device is in the standby mode (with a very low current
consumption) if the voltage at the MODE pin is
>(V CC -
11038080.017.png 11038080.018.png 11038080.019.png 11038080.020.png 11038080.021.png 11038080.022.png 11038080.023.png 11038080.024.png 11038080.025.png 11038080.026.png 11038080.027.png 11038080.028.png 11038080.029.png 11038080.030.png 11038080.031.png 11038080.032.png
Philips Semiconductors
Product specification
2
´
0.7 W BTL audio amplifier
TDA8542TS
Headphone connection
¤ 2 V CC . See Fig.4 for
the application diagram. In this case the BTL/SE pin must
be either at a logic LOW level or connected to ground.
If the BTL/SE pin is at a LOW level, the power amplifier for
the positive loudspeaker terminal is always in mute
condition.
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 at 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
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
V I
input voltage
-
0.3
V CC + 0.3 V
I ORM
repetitive peak output current
-
1
A
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
-
1.12
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
110 (1)
K/W
Note
1. See Section “Thermal design considerations”.
Table 1 Maximum ambient temperature at different conditions
CONTINUOUS SINE WAVE DRIVEN
V CC
(V)
R L
(
P o
(W)
W
)
P max
(W)
T amb(max)
(
°
C)
3.3
4
2
´
0.65
1.12
27 (1)
3.3
8
2
´
0.55
0.60
84
5
8
2
´
1.2
1.33
-
(1)
5
16
2 ´ 0.70
0.80
62
Note
1. See Section “Thermal design considerations”.
1998 Mar 25
5
not to ground, but to a voltage level of 1
11038080.033.png

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