TDA7491P STMicroelectronics, TDA7491P Datasheet - Page 37

• Manufacturer Part Number: TDA7491P
• Description: IC, AMP, AUDIO, CLASS D, 36POWERSO
• Manufacturer: STMicroelectronics

Specifications of TDA7491P

• Amplifier Class: D
• No. Of Channels: 2
• Output Power: 10W
• Supply Voltage Range: 5V To 18V
• Thd + N: 0.1% @ 1W, 6ohm, VCC=11V
• Load Impedance: 8ohm
• Operating Temperature Range: 0°C To +70°C
• Rohs Compliant: Yes

TDA7491P
7.7
7.8
Protection function
The TDA7491P is fully protected against overvoltages, undervoltages, overcurrents and
thermal overloads as explained here.
Overvoltage protection (OVP)
If the supply voltage exceeds the value for V
page 10
high-impedance state. When the supply voltage drops to below the threshold value the
device restarts.
Undervoltage protection (UVP)
If the supply voltage drops below the value for V
specifications on page 10
to the high-impedance state. When the supply voltage recovers the device restarts.
Overcurrent protection (OCP)
If the output current exceeds the value for I
page 10
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
the positive and negative PWM outputs are forced to 50% duty cycle. If the junction
temperature reaches the value for Tj given in
the 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 the protection is activated it is in the
high-impedance state. The pin can be connected to a power supply (<18 V) by a pull-up
resistor whose value is limited by the maximum sinking current (200 µA) of the pin.
Figure 57. Behavior of pin DIAG for various protection conditions
the overvoltage protection is activated which forces the outputs to the
the overcurrent protection is activated which forces the outputs to the
VDD
Overcurrent
protection
the undervoltage protection is activated which forces the outputs
j
, reaches 145 °C (nominal), the device goes to mute mode and
Protection logic
Doc ID 13540 Rev 4
TDA7491P
Restart
OCP
OVP
Table 5: Electrical specifications on page 10
given in
given in
UVP
DIAG
given in
VDD
Table 5: Electrical specifications on
Table 5: Electrical specifications on
R1
OV, UV, OT
protection
Table 5: Electrical
Applications information
Restart
OC
, is determined
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