TDA8563 datasheet(5/20 Pages) PHILIPS

5 / 20 page

1997 Feb 20

Philips Semiconductors

Product speciﬁcation

× 40 W/2 Ω stereo BTL car radio power

ampliﬁer with diagnostic facility

TDA8563AQ

SHORT-CIRCUIT PROTECTION

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 12 is continuously low.

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

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 12 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

When the virtual junction temperature Tvj reaches 150 °C,

pin 12 will become continuously low.

OPEN COLLECTOR OUTPUT

Pin 12 is an open collector output, which allows pin 12 of

more devices being tied together.

Fig.4 Short-circuit waveform.

handbook, full pagewidth

MGA722

short-circuit over the load

20 ms

50 s

current

output

stage

V12

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