TDA8596_15 Datasheet, PDF (15/48 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
V_O
I²C-bus mode only
(V)
V_P
14.4
8.8
8.6
7.2
5.0
3.5
0
POR
IB1 bit D0
DIAG
output voltage
(1)
(2)
V_SVR
(1) Low V_P mute activated.
(2) V_POR: V_P level at which POR is activated.
Fig 9. Low V_P behavior; I²C-bus mode only
t (s)
001aad185
7.9 Overvoltage and load dump protection
When the supply voltage V_P exceeds 22 V, all amplifier output stages will be switched to
high-impedance. The TDA8596 is protected against load dump transients up to 50 V.
7.10 Thermal pre-warning and thermal protection
If the average junction temperature reaches the (I²C-bus programmable) pre-warning
level, a thermal pre-warning will be generated, which can be read out on the I²C-bus. If the
TDA8596 is programmed to send thermal warning information to the DIAG pin, the DIAG
pin will be pulled LOW. The default thermal pre-warning detection level (IB3[D4] = 0) is
145 °C typical. In case IB3[D4] = 1, the detection level is modified to 122 °C typical.
In legacy mode the thermal pre-warning level is fixed at 145 °C typical.
If the junction temperature increases further, the temperature controlled gain reduction will
be activated for all four channels to reduce the output power (see Figure 10). If this still
does not reduce the average junction temperature, all channels will be switched off at the
absolute maximum temperature T_off, typical 175 °C.
TDA8596_2
Product data sheet
Rev. 02 — 8 November 2007
© NXP B.V. 2007. All rights reserved.
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