TDA8542AT Datasheet, PDF (5/20 Pages) NXP Semiconductors – 2 x 1.5 W BTL audio amplifier

Philips Semiconductors
2 × 1.5 W BTL audio amplifier
Product specification
TDA8542AT
FUNCTIONAL DESCRIPTION
The TDA8542AT is a 2 × 1.5 W BTL audio power amplifier
capable of delivering 2 × 1.5 W output power to an 8 Ω
load at THD = 10% using a 6 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.
Mode select pin
The device is in the standby mode (with a very low current
consumption) if the voltage at the MODE pin is
>(V_CC − 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 V_CC − 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.
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 6 V
supply voltage and an 8 Ω loudspeaker an output power of
1.5 W can be delivered.
Headphone connection
A 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.14). In this case the BTL/SE pin must be
either on 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 ¹â„₂V_CC (see Fig.14).
In this case the BTL/SE pin must be either on a logic LOW
level or connected to ground. If the BTL/SE pin is on a
LOW level, the power amplifier for the positive
loudspeaker terminal is always in mute condition.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
CONDITIONS
V_CC
V_I
I_ORM
T_stg
T_amb
V_sc
P_tot
supply voltage
input voltage
repetitive peak output current
storage temperature
operating ambient temperature
AC and DC short-circuit safe voltage
total power dissipation
operating
non-operating
MIN.
−0.3
−0.3
−
−55
−40
−
−
MAX.
+18
V_CC + 0.3
1
+150
+85
10
2.2
UNIT
V
V
A
°C
°C
V
W
QUALITY SPECIFICATION
In accordance with “SNW-FQ-611-E”.
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
R_th(j-a)
thermal resistance from junction to ambient
CONDITIONS
in free air
VALUE
60
UNIT
K/W
1998 Mar 25
5