1995 May 08
4
Philips Semiconductors
Product specification
2
×
6 W hi-fi audio power amplifier
TDA2615
PINNING
SYMBOL
PIN
DESCRIPTION
−
INV1
1
non-inverting input 1
MUTE
2
mute input
1
⁄
2
V
P
/GND
3
1
⁄
2
supply voltage or ground
OUT1
4
output 1
−
V
P
5
supply voltage (negative)
OUT2
6
output 2
+V
P
7
supply voltage (positive)
INV1, 2
8
inverting input 1 and 2
−
INV2
9
non-inverting input 2
Fig.2 Pin configuration.
MLA708
1
2
3
4
5
6
7
8
9
P
+ V
OUT2
MUTE
INV2
TDA2615
/ GND
P
V
INV1
INV1, 2
OUT1
1/2 V
P
FUNCTIONAL DESCRIPTION
The TDA2615 is a hi-fi stereo amplifier designed for mains
fed applications, such as stereo radio and stereo TV. The
circuit is optimally designed for symmetrical power
supplies, but is also well-suited to asymmetrical power
supply systems.
An output power of 2
×
6 W (THD = 0.5%) can be
delivered into an 8
Ω
load with a symmetrical power supply
of
±
12 V. The gain is internally fixed at 30 dB, thus offering
a low gain spread and a very good gain balance between
the two amplifiers (0.2 dB).
A special feature is the input mute circuit. This circuit
disconnects the non-inverting inputs when the supply
voltage drops below
±
6 V, while the amplifier still retains its
DC operating adjustment. The circuit features suppression
of unwanted signals at the inputs, during switch-on and
switch-off.
The mute circuit can also be activated via pin 2. When a
current of 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 measures 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 6 K/W, the heatsink can be
calculated as follows:
at R
L
= 8
Ω
and V
S
=
±
12 V, the measured maximum
dissipation is 7.8 W.
With a maximum ambient temperature of +60
°
C, the
thermal resistance of the heatsink is:
The metal tab has the same potential as pin 5.
R
th
150
60
–
7.8
----------------------
6
–
5.5 K/W
=
=
