INTEGRATED CIRCUITS
DATA SHEET
TDA8547
2
×
1 W BTL audio amplifier with
output channel switching
Preliminary specification
File under Integrated Circuits, IC01
1997 Oct 07
Philips Semiconductors
Preliminary specification
2
×
1 W BTL audio amplifier with output
channel switching
FEATURES
•
Selection between output channels
•
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
APPLICATIONS
•
Telecommunication equipment
•
Portable consumer products
•
Personal computers
•
Motor-driver (servo).
TDA8547
The TDA8547(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 operating condition of all channels of the device
(standby, mute or on) is externally controlled by the
MODE pin. With the SELECT pin one of the output
channels can be switched in the standby condition. This
feature can be used for loudspeaker selection and also
reduces the quiescent current consumption.
The TDA8547T comes in a SO16 package and the
TDA8547 in a DIP16 package.
QUICK REFERENCE DATA
SYMBOL
V
CC
I
q
I
stb
P
o
THD
SVRR
PARAMETER
supply voltage
quiescent current
standby current
output power
total harmonic distortion
supply voltage ripple rejection
THD = 10%; R
L
= 8
Ω;
V
CC
= 5 V
P
o
= 0.5 W
V
CC
= 5 V; 2 channels
V
CC
= 5 V; 1 channel
CONDITIONS
MIN.
2.2
−
−
−
1
−
50
TYP.
5
15
8
−
−
0.15
−
MAX.
18
22
12
10
−
−
−
UNIT
V
mA
mA
µA
W
%
dB
ORDERING INFORMATION
TYPE
NUMBER
TDA8547T
TDA8547
PACKAGE
NAME
SO16
DIP16
DESCRIPTION
plastic small outline package; 16 leads; body width 7.5 mm
plastic dual in-line package; 16 leads (300 mil); long body
VERSION
SOT162-1
SOT38-1
1997 Oct 07
2
Philips Semiconductors
Preliminary specification
2
×
1 W BTL audio amplifier with output
channel switching
BLOCK DIAGRAM
TDA8547
handbook, full pagewidth
VCC1 VCC2
16
9
−
IN1−
IN1+
14
13
−
+
R
VCC1
R
15
OUT1−
20 kΩ
−
−
+
2
OUT1+
20 kΩ
STANDBY/MUTE LOGIC
−
IN2−
IN2+
11
12
TDA8547
10
OUT2−
−
+
R
VCC2
R
20 kΩ
4
20 kΩ
3
5
−
−
+
7
OUT2+
SVRR
MODE
SELECT
STANDBY/MUTE LOGIC
1
GND1
8
GND2
MGK697
Fig.1 Block diagram.
1997 Oct 07
3
Philips Semiconductors
Preliminary specification
2
×
1 W BTL audio amplifier with output
channel switching
PINNING
SYMBOL
GND1
OUT1+
MODE
SVRR
SELECT
n.c.
OUT2+
GND2
V
CC2
OUT2−
IN2−
IN2+
IN1+
IN1−
OUT1−
V
CC1
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DESCRIPTION
ground, channel 1
positive loudspeaker terminal,
channel 1
operating mode select (standby,
mute, operating)
half supply voltage, decoupling
ripple rejection
input for selection of operating
channel
not connected
positive loudspeaker terminal,
channel 2
ground, channel 2
supply voltage, channel 2
negative loudspeaker terminal,
channel 2
negative input, channel 2
positive input, channel 2
positive input, channel 1
negative input, channel 1
negative loudspeaker terminal,
channel 1
supply voltage, channel 1
MODE pin
Fig.2 Pin configuration.
TDA8547
handbook, halfpage
GND1 1
OUT1+ 2
MODE 3
SVRR 4
16 VCC1
15 OUT1−
14 IN1−
13 IN1+
TDA8547
SELECT 5
n.c. 6
OUT2+ 7
GND2 8
MGK696
12 IN2+
11 IN2−
10 OUT2−
9
VCC2
FUNCTIONAL DESCRIPTION
The TDA8547(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 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.
The whole device (both channels) is in the standby mode
(with a very low current consumption) if the voltage at the
MODE pin is >(V
CC
−
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.
SELECT pin
If the voltage at the SELECT pin is in the range between
1.5 V and V
CC
−
1.5 V, or if it is kept floating, then both
channels can be operational. If the SELECT pin is set to a
LOW voltage or grounded, then only channel 2 can
operate and the power amplifier of channel 1 will be in the
standby mode. In this case only the loudspeaker at
channel 2 can operate and the loudspeaker at channel 1
will be switched off. If the SELECT pin is set to a
HIGH level or connected to V
CC
, then only channel 1 can
4
1997 Oct 07
Philips Semiconductors
Preliminary specification
2
×
1 W BTL audio amplifier with output
channel switching
operate and the power amplifier of channel 2 will be in the
standby mode. In this case only the loudspeaker at
channel 1 can operate and the loudspeaker at channel 2
will be switched off. Setting the SELECT pin to a LOW or
a HIGH voltage results in a reduction of quiescent current
consumption by a factor of approximately 2.
Switching with the SELECT pin during operating is not
plop-free, because the input capacitor of the channel
which is coming out of standby needs to be charged first.
TDA8547
For plop-free channel selecting the device has first to be
set in mute condition with the MODE pin (between 1.5 V
and V
CC
−
1.5 V), then set the SELECT pin to the new
level, after a delay set the MODE pin to a LOW level.
The delay needed depends on the values of the input
capacitor and the feedback resistors. Time needed is
approx. 10
×
C1
×
(R1 + R2), so approximately 0.6 s. for
the values in Fig.4.
Table 1
Control pins MODE and SELECT versus status of output channels
Voltage levels at control pins at V
P
= 5 V; for other supply voltages see Figs. 14 and 15.
CONTROL PIN
MODE
HIGH
(1)
/NC
(2)
HVP
(4)
LOW
(5)
HVP
(4)
/LOW
(5)
HVP
(4)
/LOW
(5)
HVP
(4)
/LOW
(5)
Notes
1. HIGH = V
pin
> V
CC
−
0.5 V.
2. NC = not connected or floating.
3. X = don’t care.
4. HVP = 1.5 V < V
pin
< V
CC
−
1.5 V.
5. LOW = V
pin
< 0.5 V.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
V
CC
V
I
I
ORM
T
stg
T
amb
V
Psc
P
tot
PARAMETER
supply voltage
input voltage
repetitive peak output current
storage temperature
operating ambient temperature
AC and DC short-circuit safe voltage
total power dissipation
SO16
DIP16
QUALITY SPECIFICATION
In accordance with
“SNW-FQ-611-E”.
The number of the quality specification can be found in the
“Quality Reference
Handbook”.
The handbook can be ordered using the code 9397 750 00192.
1997 Oct 07
5
CONDITIONS
operating
MIN.
−0.3
−0.3
−
−55
−40
−
−
−
MAX.
+18
V
CC
+ 0.3
1
+150
+85
10
1.2
2.2
V
V
A
°C
°C
V
W
W
UNIT
SELECT
X
(3)
HVP
(4)
/NC
(2)
HVP
(4)
/NC
(2)
HIGH
(1)
HVP
(4)
/NC
(2)
LOW
(5)
STATUS OF OUTPUT CHANNEL
CHANNEL 1
standby
mute
on
mute/on
mute/on
standby
CHANNEL 2
standby
mute
on
standby
mute/on
mute/on
TYP. I
q
(mA)
0
15
15
8
15
8
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