TDA8594_15 Datasheet, PDF (14/49 Pages) NXP Semiconductors – I2C-bus controlled 4  50 W power amplifier

NXP Semiconductors
TDA8594
I²C-bus controlled 4  50 W power amplifier
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 Power-On Reset (POR) is activated.
Fig 9. Low V_P behavior; I²C-bus mode only
t (s)
001aad185
7.11 Overvoltage and load dump protection
When the battery voltage V_P is higher than 22 V, the amplifier stage will be switched to
high-impedance. The TDA8594 is protected against load dump voltage with supply
voltage up to 50 V.
7.12 Thermal pre-warning and thermal protection
If the average junction temperature reaches a level that is adjustable via the I²C-bus,
selected with IB3[D4], the pre-warning will be activated resulting in a LOW level on
pin DIAG (if selected) and can be read out via the I²C-bus. The default setting for the
thermal pre-warning is IB3[D4] = 0 setting the warning level at 145 C. In legacy mode the
thermal pre-warning is set at 145 C.
If the 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 does not
reduce the average junction temperature, all four channels will be switched off at the
absolute maximum temperature T_off, typical 175 C.
TDA8594
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 11 June 2013
© NXP B.V. 2013. All rights reserved.
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