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TDA8541T Datasheet(PDF) 3 Page - NXP Semiconductors

Part # TDA8541T
Description  1 W BTL audio amplifier
PDF  20 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8541T Datasheet(HTML) 3 Page - NXP Semiconductors

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1998 Apr 01
3
Philips Semiconductors
Product specification
1 W BTL audio amplifier
TDA8541
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, halfpage
MGB972
4
STANDBY/MUTE LOGIC
3
6
2
1
7
8
5
R
R
20 k
Ω
20 k
Ω
IN
−
IN
+
VCC
SVR
MODE
OUT
−
OUT
+
GND
−
−
+
−
−
+
TDA8541
PINNING
SYMBOL
PIN
DESCRIPTION
MODE
1
operating mode select
(standby, mute, operating)
SVR
2
half supply voltage, decoupling
ripple rejection
IN+
3
positive input
IN
−
4
negative input
OUT
−
5
negative loudspeaker terminal
VCC
6
supply voltage
GND
7
ground
OUT+
8
positive loudspeaker terminal
Fig.2 Pin configuration.
handbook, halfpage
1
2
3
4
8
7
6
5
MGB971
TDA8541
OUT
+
GND
SVR
VCC
OUT
−
IN
−
IN
+
MODE
FUNCTIONAL DESCRIPTION
The 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 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 an 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 select pin
The 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.



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