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

3

1

OUT1

4

output 1

−V

P

5

supply voltage (negative)

OUT2

6

output 2

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

µA 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:

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

==