TDA8594 Datasheet, PDF (12/48 Pages) NXP Semiconductors – I2C-bus controlled 4 X 50 W power amplifier

NXP Semiconductors
TDA8594
I²C-bus controlled 4 × 50 W power amplifier
When the SVR capacitor has discharged, the amplifier starts up again if the V_P voltage is
above the low V_P mute threshold, typically 7.5 V. Below the low V_P mute threshold, the
outputs of the amplifier remain low. In I²C-bus mode, a supply voltage drop below V_P(reset),
typically 5 V, results in setting bit DB2[D7] and not starting of the amplifiers but waiting for
an I²C-bus command to start.
The amplifier prevents audio pops during engine start. To prevent pops on the output
caused by the application during an engine start (for instance tuner regulator out of
regulation), the STB pin can be made zero when an engine start is detected. The STB pin
activates the fast mute and disturbances at the amplifier inputs are suppressed.
V
(V)
V_P
14
V_SVR
8.4
7
V_O ⁽²⁾
V_hr ⁽¹⁾
(1) Headroom voltage V_hr = V_P − V_O.
(2) Steady state output voltage V_O = V_SVR − 1.4 V.
(3) Headroom protection threshold = V_O + 1.6 V.
Fig 7. Low headroom protection
1.6 V
headroom protection
threshold ⁽³⁾
t (s)
001aad172
TDA8594_2
Product data sheet
Rev. 02 — 11 December 2007
© NXP B.V. 2007. All rights reserved.
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