TDA7498MV 查看數據表（PDF） - STMicroelectronics
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TDA7498MV Datasheet PDF : 26 Pages
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TDA7498MV
Undervoltage protection (UVP)
Application information
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
VDD
R1
Protection logic
DIAG
VDD
Overcurrent
protection
Restart
Restart
OV, UV, OT
protection
DocID016505 Rev 6
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