TDA7498MV

Application information

DocID016505 Rev 6

21/26

Undervoltage protection (UVP)

If the supply voltage drops below the value for VUVP given in Table 6: "Electrical

specifications ", the undervoltage protection is activated which forces the outputs to 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 IOCP given in Table 6: "Electrical specifications ",

the overcurrent protection is activated which forces the outputs to the high impedance

state. Periodically, the device attempts to restart. If the overcurrent condition is still present,

then the OCP remains active. The restart time, TOC, is determined by the RC components

connected to pin STBY.

Thermal protection (OTP)

If the junction temperature, Tj, reaches 145 °C (nominally), the device goes to mute mode

and the positive and negative PWM outputs are forced to 50% duty cycle. If the junction

temperature reaches the value for Tj given in Table 6: "Electrical specifications ", the device

shuts down and the output is forced to the high-impedance state. When the device cools

sufficiently, the device restarts.

5.8

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 (< 39

V) by a pull-up resistor whose value is limited by the maximum sinking current (200 µA) of

the pin.

Figure 25: Behavior of pin DIAG for various protection conditions

TDA7498MV

Protection logic

R1

DIAG

VDD

VDD

Overcurrent

protection

Restart

Restart

OV, UV, OT

protection