TDA8541T ,1 W BTL audio amplifierAPPLICATIONS• No switch-on/switch-off plops• High supply voltage ripple rejection • Portable consum ..
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TDA8542AT ,2 x 1.5 W BTL audio amplifier
TDA8542AT ,2 x 1.5 W BTL audio amplifier
TDA8542AT ,2 x 1.5 W BTL audio amplifier
TDA8542AT. ,2 x 1.5 W BTL audio amplifier
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TDA8541T
1 W BTL audio amplifier
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
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 TDA8541(T) is a one channel audio power amplifier
for an output power of 1 W with an 8 Ω load at a 5V
supply. The circuit contains a BTL amplifier with a
complementary PNP-NPN output stage and standby/mute
logic. The TDA8541T comes in an 8 pin SO package and
the TDA8541 in an 8 pin DIP package.
APPLICATIONS Portable consumer products Personal computers Telephony.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
BLOCK DIAGRAM
PINNING
FUNCTIONAL DESCRIPTIONThe TDA8541(T) is a BTL audio power amplifier capable
of delivering 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 dB to 30 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 an NPN power
transistor. The total voltage loss is <1 V and with a 5V
supply voltage and an 8 Ω loudspeaker an output power of W can be delivered.
Mode select pinThe device is in 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.
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).
QUALITY SPECIFICATIONIn 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.
THERMAL CHARACTERISTICS
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 0.5× VCC.
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
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 2× R2/R1 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 an input voltage of 1 V (RMS) in a bandwidth of 20 kHz, so including
noise.
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
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= 100 K/W for the DIP8 envelope;
the maximum sine wave power dissipation for
Tamb =25 °C is:
For Tamb =60 °C the maximum total power dissipation is:
BTL applicationTamb =25 °C if not specially mentioned, VCC =5V,=1 kHz, RL =8 Ω, Gv=20 dB, audio band-passHzto22 kHz.
The BTL application diagram is shown 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 C2 influences the
behaviour of the SVRR at low frequencies, increasing the
value of C2 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.
150 25–
100---------------------- 1.25W=
150 60–
100---------------------- 0.9W=
SE applicationTamb =25 °C if not specially mentioned, VCC= 7.5V,=1 kHz, RL =4 Ω, Gv=20 dB, audio band-passHzto22 kHz.
The SE application diagram is shown in Fig.13.
The capacitor value of C3 in combination with the load
impedance determines the low frequency behaviour.
The total harmonic distortion as a function of frequency
was measured with low-pass filter of 80 kHz. The value of
capacitor C2 influences the behaviour of the SVRR at low
frequencies, increasing the value of C2 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.
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
BTL APPLICATION
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
Philips Semiconductors Product specification
1 W BTL audio amplifier TDA8541
SE APPLICATION
