TDA8511J データシートの表示（PDF） - Philips Electronics

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TDA8511J

4×13 W single-ended power amplifiers

Philips Electronics 

Philips Semiconductors

4 × 13 W single-ended power amplifiers

Preliminary specification

TDA8511J

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 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.

handbook, halfpage VO

0

V16

VP

0

MGA706

t

Fig.3 Distortion detector waveform.

TEMPERATURE DETECTION

When the virtual junction temperature Tvj reaches 150 °C,

pin 16 will be active LOW.

OPEN COLLECTOR OUTPUT

Pin 16 is an open collector output, which allows that more

devices can be connected together (pins 16).

handbook, full pagewidthcurrent

in

output

stage

V16

VP

short-circuit over the load

50 µs

20 ms

2000 Mar 10

Fig.4 Short-circuit waveform.

5

MGL508

t

t

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