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TDA8547TS
2 x 0.7 W BTL audio amplifier with output channel switching
Philips Semiconductors Product specification×
0.7 W BTL audio amplifier with
output channel switching TDA8547TS
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, VCC and across the
load Thermally protected.
APPLICATIONS Telecommunication equipment Portable consumer products Personal computers Motor-driver (servo).
GENERAL DESCRIPTIONThe TDA8547TS is a two channel audio power amplifier
for an output power of 2× 0.7 W with a 16 Ω load at a 5V
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 1.2W.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Product specification× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
BLOCK DIAGRAM
Philips Semiconductors Product specification× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
PINNING
FUNCTIONAL DESCRIPTIONThe TDA8547TS is a 2× 0.7 W BTL audio power amplifier
capable of delivering 2× 0.7 W output power to a 16Ω
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 6to30 dB by external feedback
resistors.
Power amplifierThe 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 5V
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 pinThe 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− 1.5V
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× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
SELECT pinIf the voltage at the SELECT pin is in the range between
1.5V 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 channel1
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 channel2
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 approximately2.
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 1.5V
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 VP=5 V; for other supply voltages see Figs.14 and 15.
Notes HIGH= Vpin >VCC− 0.5V. NC= not connected or floating. X= don’t care. HVP= 1.5V< Vpin
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
Philips Semiconductors Product specification× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
QUALITY SPECIFICATION
In accordance with “SNW-FQ-611-E”.
THERMAL CHARACTERISTICS
Table 2 Maximum ambient temperature at different conditions
Note At THD= 10%.
Philips Semiconductors Product specification× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
DC CHARACTERISTICS
VCC =5V; Tamb =25 °C; RL =8 Ω; VMODE=0 V; gain=20 dB; measured in BTL application circuit Fig.4; unless
otherwise specified.
Notes Measured with RL= ∞. 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. The DC output voltage with respect to ground is approximately 0.5VCC.
Philips Semiconductors Product specification× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
AC CHARACTERISTICS
VCC =5V; Tamb =25 °C; RL =8 Ω; f=1 kHz; VMODE=0 V; gain=20 dB; measured in BTL application circuit Fig.4;
unless otherwise specified.
Notes Gain of the amplifier is in BTL application circuit Fig.4. The noise output voltage is measured at the output in a frequency range from 20Hzto20 kHz (unweighted), with a
source impedance of RS =0 Ω at the input. Supply voltage ripple rejection is measured at the output, with a source impedance of RS =0 Ω 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. Supply voltage ripple rejection is measured at the output, with a source impedance of RS =0 Ω 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. Output voltage in mute position is measured with a 1 V (RMS) input voltage in a bandwidth of 20Hzto20 kHz,
so including noise. Channel separation is measured at the output with a source impedance of RS =0 Ω at the input and a frequency of kHz. The output power in the operating channel is set to 0.5W. R2--------×
Philips Semiconductors Product specification× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
TEST AND APPLICATION INFORMATION
Test conditions
Because the application can be either Bridge-Tied Load
(BTL) or Single-Ended (SE), the curves of each
application are shown separately.
The thermal resistance= 110 K/W for the SSOP20; the
maximum sine wave power dissipation for Tamb =25°C
is:
For Tamb =60 °C the maximum total power dissipation is:
Thermal Design Considerations
The ‘measured’ thermal resistance of the IC package is
highly dependent on the configuration and size of the
application board. Data may not be comparable between
different Semiconductor manufacturers because the
application boards and test methods are not (yet)
standardized. Also, the thermal performance of packages
for a specific application may be different than presented
here, because the configuration of the application boards
(copper area!) may be different. Philips Semiconductors
uses FR-4 type application boards with 1 oz copper
traces with solder coating.
The SSOP package has improved thermal conductivity
which reduces the thermal resistance. Using a practical
PCB layout (see Fig.24) with wider copper tracks to the
corner pins and just under the IC, the thermal resistance
from junction to ambient can be reduced to about 80 K/W.
For Tamb =60 °C the maximum total power dissipation at
this PCB layout is:
Please note that this two channel IC is mentioned for
application with only one channel active. For that reason
the curves for worst case power dissipation are given for
the condition of only one of the both channels driven with
a 1 kHz sine wave signal.
BTL application
Tamb =25 °C if not specially mentioned, VCC =5V,=1 kHz, RL =8 Ω, Gv=20 dB, audio band-passHzto22 kHz.
The BTL application circuit is illustrated in Fig.4.
150 25–
110---------------------- 1.14W=
150 60–
110---------------------- 0.82W=
150 60–---------------------- 1.12W=
The quiescent current has been measured without any
load impedance and both channels driven. When one
channel is active the quiescent current will be halved.
The total harmonic distortion as a function of frequency
was measured using a low-pass filter of 80 kHz.
The value of capacitor C3 influences the behaviour of the
SVRR at low frequencies: increasing the value of C3
increases the performance of the SVRR.
The figure of the MODE voltage (VMODE) as a function of
the supply voltage shows three areas; operating, mute
and standby. It shows, that the DC-switching levels of the
mute and standby respectively depend on the supply
voltage level. The figure of the SELECT voltage (VSELECT)
as a function of the supply voltage shows the voltage
levels for switching the channels in the active, mute or
standby mode.
SE application
Tamb =25 °C if not specially mentioned, VCC= 7.5V,=1 kHz, RL =4 Ω, Gv=20 dB, audio band-passHzto22 kHz.
The SE application circuit is illustrated in Fig.16.
Increasing the value of electrolytic capacitor C3 will result
in a better channel separation. Because the positive
output is not designed for high output current (2× Io) at
low load impedance (≤16 Ω), the SE application with
output capacitors connected to ground is advised.
The capacitor value of C6/C7 in combination with the load
impedance determines the low frequency behaviour.
The THD as a function of frequency was measured using
a low-pass filter of 80 kHz. The value of capacitor C3
influences the behaviour of the SVRR at low frequencies:
increasing the value of C3 increases the performance of
the SVRR.
General remark
The frequency characteristic can be adapted by
connecting a small capacitor across the feedback
resistor. To improve the immunity to HF radiation in radio
circuit applications, a small capacitor can be connected in
parallel with the feedback resistor (56 kΩ); this creates a
low-pass filter.
Philips Semiconductors Product specification× 0.7 W BTL audio amplifier with
output channel switching TDA8547TS
BTL APPLICATION
