Philips TDA8547TS-N1, TDA8547T-N1 Datasheet

DATA SH EET

Preliminary specification
File under Integrated Circuits, IC01

1997 Oct 07

INTEGRATED CIRCUITS

TDA8547

2 × 1 W BTL audio amplifier with
output channel switching

1997 Oct 07 2

Philips Semiconductors Preliminary specification

2 × 1 W BTL audio amplifier with output
channel switching

TDA8547

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.

APPLICATIONS

• Telecommunication equipment

• Portable consumer products

• Personal computers

• Motor-driver (servo).

GENERAL DESCRIPTION

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

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

supply voltage 2.2 5 18 V

I

q

quiescent current VCC= 5 V; 2 channels − 15 22 mA

V

CC

= 5 V; 1 channel − 812mA

I

stb

standby current −−10 µA

P

o

output power THD = 10%; RL=8Ω; VCC=5V 1 −−W

THD total harmonic distortion P

o

= 0.5 W − 0.15 − %

SVRR supply voltage ripple rejection 50 −−dB

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA8547T SO16 plastic small outline package; 16 leads; body width 7.5 mm SOT162-1
TDA8547 DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1

1997 Oct 07 3

Philips Semiconductors Preliminary specification

2 × 1 W BTL audio amplifier with output
channel switching

TDA8547

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MGK697

STANDBY/MUTE LOGIC

R

R

20 kΩ

20 kΩ

IN1−
IN1+

V

CC1

OUT1−

OUT1+

−

−
+

−

−
+

STANDBY/MUTE LOGIC

R

R

20 kΩ

20 kΩ

IN2−
IN2+

V

CC2

SVRR

MODE

OUT2−

OUT2+

−

−
+

−

−
+

SELECT

GND1

GND2

V

CC1

V

CC2

16

9

15

2

10

7

18

14
13

11
12

4

3
5

TDA8547

1997 Oct 07 4

Philips Semiconductors Preliminary specification

2 × 1 W BTL audio amplifier with output
channel switching

TDA8547

PINNING

SYMBOL PIN DESCRIPTION

GND1 1 ground, channel 1
OUT1+ 2 positive loudspeaker terminal,

channel 1

MODE 3 operating mode select (standby,

mute, operating)

SVRR 4 half supply voltage, decoupling

ripple rejection

SELECT 5 input for selection of operating

channel
n.c. 6 not connected
OUT2+ 7 positive loudspeaker terminal,

channel 2
GND2 8 ground, channel 2
V

CC2

9 supply voltage, channel 2

OUT2− 10 negative loudspeaker terminal,

channel 2
IN2− 11 negative input, channel 2
IN2+ 12 positive input, channel 2
IN1+ 13 positive input, channel 1
IN1− 14 negative input, channel 1
OUT1− 15 negative loudspeaker terminal,

channel 1
V

CC1

16 supply voltage, channel 1

Fig.2 Pin configuration.

handbook, halfpage

TDA8547

MGK696

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

GND1

OUT1+

MODE

SVRR

SELECT

n.c.

OUT2+

GND2

V

CC2

OUT2−

IN2−

IN2+

IN1+

IN1−

OUT1−

V

CC1

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.

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 >(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.

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 VCC, then only channel 1 can

1997 Oct 07 5

Philips Semiconductors Preliminary specification

2 × 1 W BTL audio amplifier with output
channel switching

TDA8547

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.

For plop-free channel selecting the device has first to be
set in mute condition with the MODE pin (between 1.5 V
and VCC− 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.

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

pin<VCC

− 1.5 V.

5. LOW = V

pin

< 0.5 V.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

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.

CONTROL PIN STATUS OF OUTPUT CHANNEL

TYP. I

q

(mA)

MODE SELECT CHANNEL 1 CHANNEL 2

HIGH

(1)

/NC

(2)

X

(3)

standby standby 0

HVP

(4)

HVP

(4)

/NC

(2)

mute mute 15

LOW

(5)

HVP

(4)

/NC

(2)

on on 15

HVP

(4)

/LOW

(5)

HIGH

(1)

mute/on standby 8

HVP

(4)

/LOW

(5)

HVP

(4)

/NC

(2)

mute/on mute/on 15

HVP

(4)

/LOW

(5)

LOW

(5)

standby mute/on 8

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

supply voltage operating −0.3 +18 V

V

I

input voltage −0.3 VCC+ 0.3 V

I

ORM

repetitive peak output current − 1A

T

stg

storage temperature −55 +150 °C

T

amb

operating ambient temperature −40 +85 °C

V

Psc

AC and DC short-circuit safe voltage − 10 V

P

tot

total power dissipation SO16 − 1.2 W

DIP16 − 2.2 W

1997 Oct 07 6

Philips Semiconductors Preliminary specification

2 × 1 W BTL audio amplifier with output
channel switching

TDA8547

THERMAL CHARACTERISTICS

Table 2 Maximum ambient temperature at different conditions

Note

1. At THD = 10%.

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(j-a)

thermal resistance from junction to ambient in free air

TDA8547T (SO16) 100 K/W
TDA8547 (DIP16) 55 K/W

V

CC

(V)

R

L

(Ω)

APPLICATION

OPERATION

MODE

P

o

(W)

(1)

CONTINUOUS SINE WAVE DRIVEN

P

max

(W)

T

amb(max)

(°C)

SO16 DIP16

5 8 2 channels BTL 2 × 1.2 1.4 − 73
5 8 1 channel BTL 1.2 0.7 80 112

7.5 8 2 channels BTL 2 × 2.4 3.0 −−

7.5 8 1 channel BTL 2.4 1.5 − 68

7.5 16 2 channels BTL 2 × 1.2 1.8 − 50

7.5 16 1 channel BTL 1.2 0.9 60 100

7.5 28 2 channels BTL 2 × 1 1.0 50 95

7.5 28 1 channel BTL 1 0.5 100 122

Fig.3 Power derating curve.

handbook, halfpage

0 40 80 160

2.5

0

2.0

120

1.5

1.0

0.5

MGK698

T

amb

(°C)

P

(W)

DIP16

SO16

1997 Oct 07 7

Philips Semiconductors Preliminary specification

2 × 1 W BTL audio amplifier with output
channel switching

TDA8547

DC CHARACTERISTICS

V

CC

=5V; T

amb

=25°C; RL=8Ω; V

MODE

= 0 V; gain = 20 dB; measured in BTL application circuit Fig.4; unless

otherwise specified.

Notes

1. Measured with R

L

= ∞. 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 RL.

2. The DC output voltage with respect to ground is approximately 0.5VCC.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

supply voltage operating 2.2 5 18 V

I

q

quiescent current BTL 2 channels;

note 1

− 15 22 mA

BTL 1 channel;
note 1

− 812mA

I

stb

standby current V

MODE=VCC

−−10 µA

V

O

DC output voltage note 2 − 2.2 − V

V

OUT+

− V

OUT−

 differential output voltage

offset

−−50 mV

I

IN+

, I

IN−

input bias current −−500 nA

V

MODE

input voltage MODE pin operating 0 − 0.5 V

mute 1.5 − V

CC

− 1.5 V

standby V

CC

− 0.5 − V

CC

V

I

MODE

input current MODE pin 0 V < V

MODE<VCC

−−20 µA

V

SELECT

input voltage SELECT pin channel 1 = standby;

channel 2 = on

0 − 1V

channel 1 = on;
channel 2 = standby

V

CC

− 1 − V

CC

V

I

SELECT

input current SELECT pin V

SELECT

=0V −−100 µA

1997 Oct 07 8

Philips Semiconductors Preliminary specification

2 × 1 W BTL audio amplifier with output
channel switching

TDA8547

AC CHARACTERISTICS

V

CC

=5V; T

amb

=25°C; RL=8Ω; f = 1 kHz; V

MODE

= 0 V; gain = 20 dB; measured in BTL application circuit Fig.4;

unless otherwise specified.

Notes

1. Gain of the amplifier is in BTL application circuit Fig.4.

2. The noise output voltage is measured at the output in a frequency range from 20 Hz to 20 kHz (unweighted), with a
source impedance of R

S

=0Ω at the input.

3. Supply voltage ripple rejection is measured at the output, with a source impedance of RS=0Ω at the input.
The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS), which is applied to
the positive supply rail.

4. Supply voltage ripple rejection is measured at the output, with a source impedance of RS=0Ω at the input.
The ripple voltage is a sine wave with a frequency between 100 Hz and 20 kHz and an amplitude of 100 mV (RMS),
which is applied to the positive supply rail.

5. Output voltage in mute position is measured with a 1 V (RMS) input voltage in a bandwidth of 20 Hz to 20 kHz,
so including noise.

6. Channel separation is measured at the output with a source impedance of RS=0Ω at the input and a frequency of
1 kHz. The output power in the operating channel is set to 0.5 W.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

P

o

output power THD = 10% 1 1.2 − W

THD = 0.5% 0.6 0.9 − W
THD total harmonic distortion Po= 0.5 W − 0.15 0.3 %
G

v

closed loop voltage gain note 1 6 − 30 dB

Z

i

differential input impedance − 100 − kΩ

V

no

noise output voltage note 2 −−100 µV

SVRR supply voltage ripple rejection note 3 50 −−dB

note 4 40 −−dB
V

o

output voltage note 5 −−200 µV

α

cs

channel separation V

SELECT

= 0.5VCC; note 6 40 −−dB

2

R2
R1

------- -

×