Protections And Overstress Conditions - Philips TDA1562Q Application Note

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Philips Semiconductors

The best method to prevent plops during engine start procedures is to switch the

amplifier to mute during engine start (as soon as the supply voltage drops rapidly) and

switch the amplifier on again, using the switch-on sequence described in Table 2, after

the supply voltage has returned to its normal value.

When the amplifier is in stand-by mode, the internal circuitry which prevents the

negative terminals being pulled below substrate level will not work. So despite the

amplifier being switched off, this may still cause plops during engine start. In this

condition, plops can be prevented by connecting Schottky diodes between the

negative terminals of the lift capacitors and ground.

4. Protections and overstress conditions

Apart from the thermal protection circuitry which is mentioned in paragraph 2.3, the

TDA1562Q is also equipped with short circuit protections.

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Application note

Rev. 01.02 — 05 May 2006

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TDA1562Q application note

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