July 1994

5

Philips Semiconductors

Product specification

4 x 12 W single-ended car radio power amplifier with

dynamic distortion detector and diagnostic interface

TDA8562Q

SHORT

When a short-circuit occurs at one or more outputs to

ground or to the supply voltage, the output stages are

switched off until the short-circuit is removed and the

device is switched on again, with a delay of approximately

20 ms, after removal of the short-circuit. During this

short-circuit condition, pin 16 is continuously low.

When a short-circuit across the load of one or more

channels occurs the output stages are switched off during

approximately 20 ms. After that time it is checked during

approximately 50

µs to see whether the short-circuit is still

present. Due to this duty cycle of 50

µs/20 ms the average

current consumption during this short-circuit condition is

very low (approximately 40 mA).

During this short-circuit condition, pin 16 is low for 20 ms

and high for 50

µs (see Fig.4).

The power dissipation in any short-circuit condition is very

low.

TEMPERATURE DETECTION

pin 16 will be active LOW.

OPEN COLLECTOR OUTPUT

Pin 16 is an open collector output, which allows pin 16 of

more devices being tied together.

Fig.3 Distortion detector waveform.

handbook, halfpage

0

VP

VO

t

0

MGA706

V16

Fig.4 Short-circuit waveform.

handbook, full pagewidth

MGA707

short-circuit over the load

20 ms

50

µs

t

t

VP

current

in

output

stage

V15