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TDA8596_2

Product data sheet

Rev. 02 — 8 November 2007

13 of 48

NXP Semiconductors

TDA8596

I2C-bus controlled 4

× 45 W power ampliﬁer with symmetrical inputs

When the SVR capacitor has discharged, the ampliﬁer will only start-up again when the

supply voltage VP increases above the low VP mute threshold, typically 7.5 V. Below this

threshold, the outputs of the ampliﬁer remain low. In I2C-bus mode, a supply voltage drop

below VP(reset), typically 5 V will result in setting bit DB2[D7]. In this condition the ampliﬁer

will wait for an I2C-bus command in order to start-up.

The TDA8596 prevents internally induced output pops during engine start. In order to

prevent pops on the output caused by the application (e.g. due to the tuner supply going

out of regulation), the STB pin can be pulled LOW when an engine start is detected. The

STB pin will activate the fast mute within 0.1 ms and consequently all disturbances at the

ampliﬁer inputs will be suppressed.

(1) Headroom voltage Vhr =VP − VO.

(2) Steady state output voltage VO =VSVR − 1.4 V.

(3) Headroom protection threshold = VO + 1.6 V.

Fig 7.

Low-headroom protection

(V)

t (s)

VSVR

VO (2)

headroom protection

threshold (3)

1.6 V

Vhr (1)

001aad172

8.4

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