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TDA8547T
Datasheet
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Philips TDA8547T Datasheet

INTEGRATED CIRCUITS
DATA SH EET
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
load
• Thermally protected.
and across the
CC
TDA8547

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

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
V
= 5 V; 1 channel − 812mA
CC
standby current −−10 µA output power THD = 10%; RL=8Ω; VCC=5V 1 −−W
= 0.5 W − 0.15 − %
o
SVRR supply voltage ripple rejection 50 −−dB

ORDERING INFORMATION

TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
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
Philips Semiconductors Preliminary specification
2 × 1 W BTL audio amplifier with output channel switching

BLOCK DIAGRAM

handbook, full pagewidth
V
−
− +
CC1
20 kΩ
IN1− IN1+
14 13
TDA8547
V
V
CC1
CC2
9
16
15
OUT1−
R
R
−
− +
2
OUT1+
IN2− IN2+
SVRR
MODE
SELECT
20 kΩ
STANDBY/MUTE LOGIC
R
TDA8547
R
−
− +
GND1
10
7
18
GND2
OUT2−
OUT2+
MGK697
11 12
4
3 5
− +
V
CC2
20 kΩ
20 kΩ
STANDBY/MUTE LOGIC
−
Fig.1 Block diagram.
Philips Semiconductors Preliminary specification
2 × 1 W BTL audio amplifier with output channel switching

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
OUT2− 10 negative loudspeaker terminal,
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,
V
CC1
9 supply voltage, channel 2
channel 2
channel 1
16 supply voltage, channel 1
handbook, halfpage
GND1
1
OUT1+
SELECT
OUT2+
MODE
SVRR
n.c.
GND2
2 3 4 5 6 7 8
TDA8547
MGK696
Fig.2 Pin configuration.
TDA8547
16
V
CC1
15
OUT1−
14
IN1−
13
IN1+
12
IN2+
11
IN2−
10
OUT2−
9
V
CC2

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
− 1.5 V, or if it is kept floating, then both
CC
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
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.
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 STATUS OF OUTPUT CHANNEL
MODE SELECT CHANNEL 1 CHANNEL 2
(1)
HIGH
HVP HVP HVP
HVP
LOW
(4)
/LOW
(4)
/LOW
(4)
/LOW
/NC
(4)
(5)
(2)
(5) (5) (5)
HVP HVP
HIGH
HVP
X
(4) (4)
(4)
LOW
(3)
/NC /NC
(1)
/NC
(5)
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.
standby standby 0
(2) (2)
mute/on standby 8
(2)
mute/on mute/on 15 standby mute/on 8
TDA8547
TYP. I
(mA)
mute mute 15
on on 15
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 total power dissipation SO16 − 1.2 W
DIP16 − 2.2 W

QUALITY SPECIFICATION

In accordance with
Handbook”
. The handbook can be ordered using the code 9397 750 00192.
“SNW-FQ-611-E”
. The number of the quality specification can be found in the
“Quality Reference
Philips Semiconductors Preliminary specification
2 × 1 W BTL audio amplifier with output
TDA8547
channel switching

THERMAL CHARACTERISTICS

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
2.5
handbook, halfpage
P
(W)
2.0
1.5
1.0
DIP16
SO16
MGK698
0.5
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
OPERATION
MODE
P
(W)
o
(1)
P
max
T
amb(max)
(°C)
(W)
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
Note
1. At THD = 10%.
Philips Semiconductors Preliminary specification
2 × 1 W BTL audio amplifier with output
TDA8547
channel switching

DC CHARACTERISTICS

V
=5V; T
CC
otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
CC
I
q
I
stb
V
O
OUT+
, I
IN−
MODE
SELECT
− V
V
I
IN+
V
I
MODE
V
I
SELECT
=25°C; RL=8Ω; V
amb
supply voltage operating 2.2 5 18 V quiescent current BTL 2 channels;
standby current V DC output voltage note 2 − 2.2 − V
differential output voltage
OUT−
offset input bias current −−500 nA input voltage MODE pin operating 0 − 0.5 V
input current MODE pin 0 V < V input voltage SELECT pin channel 1 = standby;
input current SELECT pin V
= 0 V; gain = 20 dB; measured in BTL application circuit Fig.4; unless
MODE
− 15 22 mA
note 1 BTL 1 channel;
− 812mA
note 1
MODE=VCC
−−10 µA
−−50 mV
mute 1.5 − V standby V
MODE<VCC
− 0.5 − V
CC
−−20 µA
CC CC
0 − 1V
channel 2 = on channel 1 = on;
V
− 1 − V
CC
CC
channel 2 = standby
=0V −−100 µA
SELECT
− 1.5 V V
V
Notes
1. Measured with R
= ∞. With a load connected at the outputs the quiescent current will increase, the maximum of this
L
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.
Philips Semiconductors Preliminary specification
2 × 1 W BTL audio amplifier with output
TDA8547
channel switching

AC CHARACTERISTICS

V
=5V; T
CC
unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
P
o
THD total harmonic distortion Po= 0.5 W − 0.15 0.3 % G
v
Z
i
V
no
SVRR supply voltage ripple rejection note 3 50 −−dB
V
o
α
cs
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
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.
=25°C; RL=8Ω; f = 1 kHz; V
amb
= 0 V; gain = 20 dB; measured in BTL application circuit Fig.4;
MODE
output power THD = 10% 1 1.2 − W
THD = 0.5% 0.6 0.9 − W
closed loop voltage gain note 1 6 − 30 dB differential input impedance − 100 − kΩ noise output voltage note 2 −−100 µV
note 4 40 −−dB output voltage note 5 −−200 µV channel separation V
R2
×
2
------- ­R1
=0Ω at the input.
S
= 0.5VCC; note 6 40 −−dB
SELECT
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