TDA7562 Просмотр технического описания (PDF) - STMicroelectronics

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TDA7562

MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES

STMicroelectronics 

TDA7562

As for SHORT TO GND / Vs the fault-detection thresholds remain unchanged from 30 dB to 16 dB gain

setting. They are as follows:

S.C. to GND x Normal Operation x

S.C. to Vs

0V

1.2V 1.8V

VS-1.8V VS-1.2V

VS

D01AU1253

Concerning SHORT ACROSS THE SPEAKER , the threshold varies from 30 dB to 16 dB gain setting,

since different loads are expected (either normal speaker’s impedance or high impedance). The values

in case of 30 dB gain are as follows:

S.C. across Load x

0V

0.5Ω 1.5Ω

Normal Operation

Infinite

D01AU1325

If the Line-Driver mode (Gv= 16 dB and Line Driver Mode diagnostic = 1) is selected, the same thresh-

olds will change as follows:

S.C. across Load x

0Ω

1.5Ω 4.5Ω

Normal Operation

infinite

D01AU1326

OUTPUT DC OFFSET DETECTION.

Any DC output offset exceeding +/- 2 V are sig-

nalled out. This inconvenient might occur as a

consequence of initially defective or aged and

worn-out input capacitors feeding a DC compo-

nent to the inputs, so putting the speakers at risk

of overheating.

This diagnostic has to be performed with low-level

output AC signal (or Vin = 0).

The test is run with selectable time duration by

microprocessor (from a "start" to a "stop" com-

mand):

START = Last reading operation or setting IB1 -

D5 - (OFFSET enable) to 1

STOP = Actual reading operation

Excess offset is signalled out if persistent

throughout the assigned testing time. This feature

is disabled if any overloads leading to activation

of the short-circuit protection occurs in the proc-

ess.

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