TDA8596_15 Datasheet, PDF (8/48 Pages) NXP Semiconductors – I2C-bus controlled 4 ´ 45 W power amplifier with symmetrical inputs

NXP Semiconductors
TDA8596
I²C-bus controlled 4 × 45 W power amplifier with symmetrical inputs
(20 ms) to minimize mute-to-operating pops. When the STB pins directly switched from
Normal operating to Standby mode, the fast mute (mutes in 0.1 ms) will be activated prior
to shut-down.
7.6 Start-up and shut-down sequence
To prevent the amplifier from producing switch-on and switch-off pop noise, the capacitor
on the SVR pin is used for smooth start-up and shut-down sequences. Larger capacitors
will lead to longer (smoother) start-up and shut-down sequences. Initially the amplifier
outputs are charged to Half Supply Voltage (HVP) minus 1.4 V in mute condition. This is
independent of the I²C-bus mute settings in I²C-bus mode or the pin STB voltage in
legacy mode. The remaining 1.4 V before the outputs reach HVP, is used for mute release
in case the I²C-bus bits (IB2[D2:D0] = 000) have been programmed to mute-off (or
V_STB > 6.5 V in legacy mode). In case the I²C-bus bits have been programmed to maintain
mute condition (IB2[D2:D0] = 111) (or 2.5 V < V_STB < 6.5 V in legacy mode) the amplifier
will stay in mute.
When the STB pin is switched LOW (< 1 V), a fast mute is performed prior to discharging
the capacitor on pin SVR. With a capacitor of 22 µF the device goes into Standby mode
(low quiescent current) within 1 s after switching STB to LOW (see also Figure 3 and
Figure 6).
Start-up and shut-down pop noise can be further reduced by activating the low pop mode.
When this mode is selected (IB2[D3] = 0), the output voltage rising slope will decrease
(resulting in a longer start-up time).
TDA8596_2
Product data sheet
Rev. 02 — 8 November 2007
© NXP B.V. 2007. All rights reserved.
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