TDA8595 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 5 — 11 June 2013 15 of 51
NXP Semiconductors
TDA8595
I
2
C-bus controlled 4 45 W power amplifier
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 TDA8595 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 I
2
C-bus,
selected with bit 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 I
2
C-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 11
). 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.
(1) Low V
P
mute activated.
(2) V
POR
: V
P
level at which Power-On Reset (POR) is activated.
Fig 10. Low V
P
behavior; I
2
C-bus mode only
14.4
8.8
8.6
7.2
3.5
0
V
P
V
SVR
output voltage
DIAG
POR
IB1 bit D0
5.0
001aad185
V
O
(V)
I
2
C-bus mode only
(1)
(2)
t (s)
