TDA1562ST datasheet(8/24 Pages) NXP

8 / 24 page

2003 Feb 12

Philips Semiconductors

Preliminary speciﬁcation

70 W high efﬁciency power ampliﬁer

with diagnostic facility

TDA1562Q; TDA1562ST;

TDA1562SD

Diagnostic output (pin DIAG)

DYNAMIC DISTORTION DETECTOR (DDD)

At the onset of clipping of the output stages, the DDD

becomes active. This information can be used to drive a

sound processor or DC-volume control to attenuate the

input signal and so limit the distortion.

SHORT-CIRCUIT PROTECTION

When a short-circuit occurs at the outputs to ground or to

the supply voltage, the output stages are switched off.

They will be switched on again approximately 20 ms after

removing the short-circuit. During this short-circuit

condition the diagnostic output is continuously LOW.

When a short-circuit occurs across the load, the output

stages are switched off during approximately 20 ms. After

that time is checked during approximately 50

µs whether

the short-circuit is still present. During this short-circuit

condition the diagnostic output is LOW for 20 ms and

HIGH for 50

µs. The power dissipation in any short-circuit

condition is very low.

TEMPERATURE DETECTION

Just before the temperature protection becomes active the

diagnostic output becomes continuously LOW.

LOAD DETECTION

Directly after the circuit is switched from standby to mute

or on, a built-in detection circuit checks whether a load is

present. The results of this check can be detected at the

diagnostic output, by switching the mode select input in the

mute mode.

Since the diagnostic output is an open-collector output,

more devices can be connected.

Fig.4 Diagnostic information.

handbook, full pagewidth

HIGH

MID

LOW

mode select

input

diagnostic

output

output voltage

across load

HIGH

LOW

no load

clipping signal

short-circuit to

supply or ground

short-circuit

across load

MGL265

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