July 1994
4
Philips Semiconductors
Product specification
6 W hi-fi audio power amplifier
TDA2614
PINNING
SYMBOL
PIN
DESCRIPTION
n.c.
1
not connected
MUTE
2
mute input
1/2V
P
/GND
3
1/2 supply (or ground at
symmetrical power supplies)
n.c.
4
not connected
GND/
−
V
P
5
ground (or negative supply rail at
symmetrical power supplies)
OUT
6
output
V
P
7
supply voltage
INV
8
inverting input
−
INV
9
non-inverting input
Fig.2 Pin configuration.
handbook, halfpage
MCD367 - 1
1
2
3
4
5
6
7
8
9
P
V
OUT
MUTE
INV
TDA2614
/ GND
P
GND / – V
n.c.
– INV
n.c.
P
1/2 V
FUNCTIONAL DESCRIPTION
The TDA2614 is a hi-fi power amplifier designed for mains
fed applications, such as radio and TV. The circuit is
optimally designed for asymmetrical power supplies, but is
also well-suited to symmetrical power supply systems.
An output power of 6 W (THD = 0.5%) can be delivered
into an 8
Ω
load with a supply of 24 V. The gain is internally
fixed at 30 dB, thus offering a low gain spread.
A special feature is the input mute circuit. This circuit
disconnects the non-inverting input when the supply
voltage drops below 10 V, while the amplifier still retains its
DC operating adjustment. The circuit features suppression
of unwanted signals at the input, during switch-on and
switch-off.
The mute circuit can also be activated via pin 2. When a
current at 300
µ
A is present at pin 2, the circuit is in the
mute condition.
The device is provided with two thermal protection circuits.
One circuit measures the average temperature of the
crystal and the other measure the momentary temperature
of the power transistors. These control circuits attack at
temperatures in excess of 150
°
C, so a crystal operating
temperature of max. 150
°
C can be used without extra
distortion.
With the derating value of 8 K/W, the heatsink can be
calculated as follows:
at R
L
= 8
Ω
and V
S
= 24 V, dissipation is 4.1 W.
With a maximum ambient temperature of 60
°
C, the
thermal resistance of the heatsink is:
R
th
150
60
–
4.1
----------------------
8
–
14 K/W.
=
=
