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TDA8542TS
2 脳 0.7 W BTL audio amplifier
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
FEATURES 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.
GENERAL DESCRIPTIONThe TDA8542TS 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 Bridge-Tied Load (BTL) amplifiers with a
complementary PNP-NPN output stage and standby/mute
logic. The TDA8542TS is available in a SSOP20 package.
APPLICATIONS Portable consumer products Personal computers Motor-driver (servo).
QUICK REFERENCE DATA
ORDERING INFORMATION
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
BLOCK DIAGRAM
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
PINNING
FUNCTIONAL DESCRIPTIONThe TDA8542TS 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 with a 16 Ω loudspeaker an output
power of 0.7 W can be delivered.
Mode select pinThe device 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.
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
Headphone connectionA headphone can be connected to the amplifier using two
coupling capacitors for each channel. The common
GND pin of the headphone is connected to the ground of
the amplifier (see Fig.13). In this case the BTL/SE pin must
be either at a logic HIGH level or not connected at all.
The two coupling capacitors can be omitted if it is allowed
to connect the common GND pin of the headphone jack
not to ground, but to a voltage level of 1 ⁄2VCC. See Fig.4 for
the application diagram. In this case the BTL/SE pin must
be either at a logic LOW level or connected to ground.
If the BTL/SE pin is at a LOW level, the power amplifier for
the positive loudspeaker terminal is always in mute
condition.
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).
QUALITY SPECIFICATIONIn accordance with “SNW-FQ-611-E”.
THERMAL CHARACTERISTICS
Note See Section “Thermal design considerations”.
Table 1 Maximum ambient temperature at different conditions
Note See Section “Thermal design considerations”.
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
DC CHARACTERISTICSVCC =5V; Tamb =25 °C; RL =8 Ω; VMODE=0 V; measured in test circuit Fig.3; unless otherwise specified.
Notes 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 1⁄2VCC.
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
AC CHARACTERISTICSVCC =5V; Tamb =25 °C; RL =8 Ω; f=1 kHz; VMODE=0 V; measured in test circuit Fig.3; unless otherwise specified.
Notes Gain of the amplifier is in test circuit of Fig.3. 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 20 kHz, so including
noise. R2-------×
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
TEST AND APPLICATION INFORMATION
Test conditionsBecause 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 considerationsThe ‘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.22) with wider copper tracks to the
corner pins and just under the IC, the thermal resistance
from junction to ambient can be reduced to approximately K/W. For Tamb =60 °C the maximum total power
dissipation for this PCB layout is:
BTL applicationTamb =25°C if not specially mentioned, VCC =5V, 1kHz, RL =8 Ω, Gv=20 dB, audio band-pass Hzto22 kHz.
The BTL application diagram is illustrated in Fig.3.
The quiescent current has been measured without any
load impedance. The total harmonic distortion as a
function of frequency was measured with 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 select voltage (Vms) 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 depends on the supply
voltage level.
SE applicationTamb =25°C if not specially mentioned, VCC =7.5V, 1kHz, RL =4 Ω, Gv=20 dB, audio band-pass Hzto22 kHz.
The SE application diagram is illustrated in Fig.14.
If the BTL/SE pin (pin 6) is connected to ground, the
positive outputs (pins 3 and 8) will be in mute condition
with a DC level of 1 ⁄2VCC. When a headphone is used
(RL≥25 Ω) the SE headphone application can be used
without output coupling capacitors; load between negative
output and one of the positive outputs (e.g. pin 3) as
common pin. The channel separation will be less in
comparison with the application using a coupling capacitor
connected to ground.
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 C4/C5 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 remarkThe frequency characteristic can be adapted by
connecting a small capacitor across the feedback resistor.
To improve the immunity of 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.
150 25–
110------ ---------------- 1.14 W=
150 60–
110------ ---------------- 0.82 W=
150 60–------ ---------------- 1.12 W=
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
BTL APPLICATION
NXP Semiconductors Product specification
2 × 0.7 W BTL audio amplifier TDA8542TS
