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

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

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

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 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:

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.

==