Philips TDA8547TS Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA8547TS

2 × 0.7 W BTL audio amplifier with
output channel switching

Product specification
Supersedes data of 1997 Oct 14
File under Integrated Circuits, IC01

1998 Apr 01

Philips Semiconductors Product specification

2 × 0.7 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

load

• Thermally protected.

APPLICATIONS

and across the

CC

TDA8547TS

GENERAL DESCRIPTION

The TDA8547TS is a two channel audio power amplifier
for an output power of 2 × 0.7 W with a 16 Ω 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 Ω load can be obtained. 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.
When only one channel is used the maximum output
power is 1.2 W.

• Telecommunication equipment

• Portable consumer products

• Personal computers

• Motor-driver (servo).

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= 5 V; 2 channels − 15 22 mA

= 5 V; 1 channel − 812mA

V

CC

standby current −−10 µA
output power

two channels THD = 10%; R

THD = 10%; R

one channel THD = 10%; R

THD = 10%; R

= 0.4 W − 0.15 − %

o

=8Ω; VCC= 3.3 V 0.5 0.6 − W

L

=16Ω; VCC= 5 V 0.6 0.7 − W

L

=8Ω; VCC=5V 1 1.2 − W

L

=4Ω; VCC= 3.3 V 1 1.2 − W

L

SVRR supply voltage ripple rejection 50 −−dB

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA8547TS SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1

1998 Apr 01 2

Philips Semiconductors Product specification

2 × 0.7 W BTL audio amplifier with
output channel switching

BLOCK DIAGRAM

handbook, full pagewidth

IN1−
IN1+

17
16

V

CC1

−

−
+

20 kΩ

TDA8547TS

V

V

CC1

CC2

11

20

18

OUT1−

R

R

−

−
+

3

OUT1+

IN2−
IN2+

SVRR

MODE

SELECT

n.c.

14
15

5

4
6

2, 7, 9, 12, 19

5

20 kΩ

STANDBY/MUTE LOGIC

−

−
+

V

CC2

20 kΩ

20 kΩ

STANDBY/MUTE LOGIC

TDA8547TS

R

R

−

−
+

GND1

13

8

110

GND2

OUT2−

OUT2+

MGK984

Fig.1 Block diagram.

1998 Apr 01 3

Philips Semiconductors Product specification

2 × 0.7 W BTL audio amplifier with
output channel switching

PINNING

SYMBOL PIN DESCRIPTION

GND1 1 ground, channel 1
n.c. 2 not connected
OUT1+ 3 positive loudspeaker terminal,

channel 1

MODE 4 operating mode select (standby, mute,

operating)

SVRR 5 half supply voltage, decoupling ripple

rejection
SELECT 6 input for selection of operating channel
n.c. 7 not connected
OUT2+ 8 positive loudspeaker terminal,

channel 2
n.c. 9 not connected
GND2 10 ground, channel 2
V

CC2

n.c. 12 not connected
OUT2− 13 negative loudspeaker terminal,

IN2− 14 negative input, channel 2
IN2+ 15 positive input, channel 2
IN1+ 16 positive input, channel 1
IN1− 17 negative input, channel 1
OUT1− 18 negative loudspeaker terminal,

n.c. 19 not connected
V

CC1

11 supply voltage, channel 2

channel 2

channel 1

20 supply voltage, channel 1

handbook, halfpage

GND1

1

n.c.

2

OUT1+

SELECT

OUT2+

MODE

SVRR

n.c.

n.c.

GND2

3
4
5

TDA8547TS

6
7
8
9

10

MGK998

Fig.2 Pin configuration.

TDA8547TS

V

20

CC1

19

n.c.

18

OUT1−

17

IN1−

16

IN1+

15

IN2+
IN2−

14

OUT2−

13

n.c.

12

V

11

CC2

FUNCTIONAL DESCRIPTION

The TDA8547TS is a 2 × 0.7 W BTL audio power amplifier
capable of delivering 2 × 0.7 W output power to a 16 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

1998 Apr 01 4

transistor. The total voltage loss is <1 V and with a 5 V
supply voltage and a 16 Ω loudspeaker an output power of

0.7 W can be delivered, when two channels are operating.
If only one channel is operating then an output power of

1.2 W can be delivered (5 V, 8 Ω).

MODE pin

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

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

CC

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.

Philips Semiconductors Product specification

2 × 0.7 W BTL audio amplifier with
output channel switching

SELECT pin

If the voltage at the SELECT pin is in the range between

1.5 V and VCC− 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 VCC, then only channel 1 can
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

Table 1 Control pins MODE and SELECT versus status of output channels
Voltage levels at control pins at V

= 5 V; for other supply voltages see Figs. 14 and 15.

P

CONTROL PIN

MODE SELECT CHANNEL 1 CHANNEL 2

(1)

HIGH

HVP
HVP
HVP

HVP

LOW

(4)
(4)
(4)

/NC

(4)
(5)

/LOW
/LOW
/LOW

(2)

(5)
(5)
(5)

HVP
HVP

HIGH

HVP

LOW

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.
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

− 1.5 V), then set the SELECT pin to the new

CC

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.

(3)

X

(4)

(2)

/NC

(4)

(2)

/NC

(1)

(4)

(2)

/NC

(5)

TDA8547TS

STATUS OF OUTPUT

CHANNEL

standby standby 0

mute mute 15

on on 15
mute/on standby 8
mute/on mute/on 15
standby mute/on 8

TYP. I

(mA)

q

Notes

1. HIGH = V

pin>VCC

− 0.5 V.

2. NC = not connected or floating.

3. X = don’t care.

4. HVP = 1.5 V < V

5. LOW = V

pin

< 0.5 V.

pin<VCC

− 1.5 V.

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

supply voltage operating −0.3 +18 V
input voltage −0.3 VCC+ 0.3 V
repetitive peak output current − 1A
storage temperature −55 +150 °C
operating ambient temperature −40 +85 °C
AC and DC short-circuit safe voltage − 10 V
power dissipation − 1.1 W

1998 Apr 01 5

Philips Semiconductors Product specification

2 × 0.7 W BTL audio amplifier with

TDA8547TS

output channel switching

QUALITY SPECIFICATION

In accordance with

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(j-a)

“SNW-FQ-611-E”

.

thermal resistance from junction to ambient in free air 110 K/W

2.0

handbook, halfpage

P

(W)

1.6

1.2

0.8

MGK987

0.4

0

0 40 80 160

120

T

amb

(°C)

Fig.3 Power derating curve.

Table 2 Maximum ambient temperature at different conditions

CONTINUOUS SINE WAVE DRIVEN

V

(V)

CC

R

(Ω)

L

APPLICATION

P

(W)

o

(1)

P

max

(W)

3.3 4 1 channel 1.2 0.58 86

3.3 4 2 channels 2 × 1.2 1.12 27

3.3 8 1 channels 0.6 0.3 117

3.3 8 2 channels 2 × 0.6 0.60 84
5 8 1 channel 1.2 0.67 76
5 8 2 channels 2 × 1.2 1.33 −
5 16 1 channel 0.7 0.35 112
5 16 2 channels 2 × 0.7 0.70 73

T

amb(max)

(°C)

Note

1. At THD = 10%.

1998 Apr 01 6