TDA8588J Datasheet, PDF(10/54 Page) NXP Semiconductors – I2C-bus controlled 4 x 50 Watt power amplifier and multiple voltage regulator

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TDA8588J Datasheet, PDF (10/54 Pages) NXP Semiconductors – I2C-bus controlled 4 x 50 Watt power amplifier and multiple voltage regulator

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Philips Semiconductors

I2C-bus controlled 4 Ã 50 Watt power

ampliï¬er and multiple voltage regulator

Product speciï¬cation

TDA8588J; TDA8588xJ

2. After 250 ms the DC load is detected and the mute is

released. This is inaudible and can be implemented

each time the IC is powered on.

3. When the amplifier start-up cycle is completed (after

1.5 s), apply an AC signal to the input, and DC-load

bits D5 of each data byte should be read and stored by

the microcontroller.

4. After at least 3 periods of the input signal, the load

status can be checked by reading AC-detect bits D4 of

each data byte.

The AC-load peak current counter can be reset by

setting bit D1 of instruction byte IB1 to logic 0 and then

to logic 1. Note that this will also reset the DC-load

detection bits D5 in each data byte.

The headroom voltage is the voltage required for correct

operation of the amplifier and is defined as the voltage

difference between the level of the DC output voltage

before the VP voltage drop and the level of VP after the

voltage drop (see Fig.4).

At a certain supply voltage drop, the headroom voltage will

be insufficient for correct operation of the amplifier. To

prevent unwanted audible noises at the output, the

headroom protection mode will be activated (see Fig.4).

This protection discharges the capacitors connected to

pins SVR and ACGND to increase the headroom voltage.

Low headroom protection

The normal DC output voltage of the amplifier is set to half

the supply voltage and is related to the voltage on

pin SVR. An external capacitor is connected to pin SVR to

suppress power supply ripple. If the supply voltage drops

(at vehicle engine start), the DC output voltage will follow

slowly due to the affect of the SVR capacitor.

(V)

SVR voltage

8.4

vehicle engine start

headroom voltage

amplifier

DC output voltage

t (sec)

mdb515

Fig.4 Amplifier output during supply voltage.

2004 Feb 24

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