tda7498l STMicroelectronics, tda7498l Datasheet - Page 23

• Manufacturer Part Number: tda7498l
• Description: 80 W + 80 W Dual Btl Class-d Audio Amplifier
• Manufacturer: STMicroelectronics

TDA7498L
5.8
Undervoltage protection (UVP)
If the supply voltage drops below the value for V
specifications on page 9
the high-impedance state. When the supply voltage recovers to within the operating range
the device restarts.
Overcurrent protection (OCP)
If the output current exceeds the value for I
page 9
high-impedance state. Periodically, the device attempts to restart. If the overcurrent
condition is still present then the OCP remains active. The restart time, T
by the R-C components connected to pin STBY.
Thermal protection (OTP)
If the junction temperature, T
and the positive and negative PWM outputs are forced to 50% duty cycle. If the junction
temperature reaches the value for T
device shuts down and the output is forced to the high-impedance state. When the device
cools sufficiently the device restarts.
Diagnostic output
The output pin DIAG is an open drain transistor. When any protection is activated it switches
to the high-impedance state. The pin can be connected to a power supply (< 36 V) by a pull-
up resistor whose value is limited by the maximum sinking current (200 µA) of the pin.
Figure 27. Behavior of pin DIAG for various protection conditions
the overcurrent protection is activated which forces the outputs to the
VDD
Overcurrent
protection
the undervoltage protection is activated which forces the outputs to
j
, reaches 145 °C (nominally), the device goes to mute mode
Protection logic
Doc ID 16504 Rev 1
TDA7498L
j
given in
Restart
OCP
Table 6: Electrical specifications on page 9
given in
UVP
DIAG
given in
VDD
Table 6: Electrical specifications on
R1
OV, UV, OT
protection
Table 6: Electrical
Applications information
Restart
OC
, is determined
23/27
the