參數(shù)資料
型號： TDA7491HV
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
封裝： ROHS COMPLIANT, SSOP-36
文件頁數(shù)： 32/41頁
文件大小： 820K
代理商： TDA7491HV
Application information
TDA7491HV
38/41
Doc ID 14242 Rev 4
7.7
Protection function
The TDA7491HV is fully protected against overvoltages, undervoltages, overcurrents and
thermal overloads as explained here.
Overvoltage protection (OVP)
If the supply voltage exceeds the value for VOVP given in Table 5: Electrical specifications on
page 10 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)
If the supply voltage drops below the value for VUVP given in Table 5: Electrical
specifications on page 10 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)
If the output current exceeds the value for IOCP given in Table 5: Electrical specifications on
page 10 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 (nominal), 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 5: Electrical specifications on page 10
the device shuts down and the output is forced to the high impedance state. When the
device cools sufficiently the device restarts.
7.8
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 A) of the pin.
Figure 58.
Behavior of pin DIAG for various protection conditions
TDA7491HV
Protection logic
R1
DIAG
VDD
Overcurrent
protection
Restart
OV, UV, OT
protection
相關(guān)PDF資料
PDF描述
TDA7491HV13TR 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA7491LP13TR 5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA7491LP 5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA7491MV13TR 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA7491MV 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7491HV13TR 功能描述:音頻放大器 20W Dual BTL Class D 18V VCC Audio Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA7491LP 功能描述:音頻放大器 20W Dual BTL Class D 18V VCC Audio Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA7491LP13TR 功能描述:音頻放大器 20W Dual BTL Class D 18V VCC Audio Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA7491MV 功能描述:音頻放大器 25W Mono BTL Class-D 4-Select dB RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA7491MV13TR 功能描述:音頻放大器 25W Mono BTL Class-D 4-Select dB RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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