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参数资料
| 型号： | TDA7492P13TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | ROHS COMPLIANT, SSOP-36 |
| 文件页数： | 15/26页 |
| 文件大小： | 508K |
| 代理商： | TDA7492P13TR |
Applications information
TDA7492P
Doc ID 15068 Rev 3
6.6
Protection function
The TDA7492P is fully protected against overvoltages, undervoltages, overcurrents and
thermal overloads as explained here.
Overvoltage protection (OVP)
page 8 the overvoltage protection is activated which forces the outputs to the
high-impedance state. When the supply voltage drops to below the threshold value the
device restarts.
Undervoltage protection (UVP)
specifications on page 8 the undervoltage protection is activated which forces the outputs to
the high-impedance state. When the supply voltage recovers the device restarts.
Overcurrent protection (OCP)
page 8 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 R-C 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
device shuts down and the output is forced to the high-impedance state. When the device
cools sufficiently the device restarts.
6.7
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 (<26 V) by a pull-up
resistor whose value is limited by the maximum sinking current (200 A) of the pin.
Figure 27.
Behavior of pin DIAG for various protection conditions
TDA7492P
Protection logic
R1
DIAG
VDD
Overcurrent
protection
Restart
OV, UV, OT
protection
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