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參數(shù)資料
| 型號： | TDA7571 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 250 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64 |
| 封裝： | ROHS COMPLIANT, HIQUAD-64 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大?。?/td> | 441K |
| 代理商： | TDA7571 |
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Functions, pins and components description
TDA7571
14/21
4
Functions, pins and components description
4.1
Short circuit protection current calculation
Figure 5.
Short circuit protection current diagram
← if Rp2 is not used
4.2
External thermal protection network
The purpose of this function is to sense critical points of the amplifier system, as example
the heatsink of the power transistors, avoiding too high temperature.
Through the external thermal warning pin (THWEXT, pin 37), a signal useful to reduce the
power dissipation reducing (as example) the output power and/or, in a system provided of
regulated power supply, reducing the voltage supply of the amplifier (±VS) is present.
Example of external thermal protection circuitry
●
Components:
–
type: B57621 C621/100k/+
–
Text = 10K
●
Results (simulations):
–
External thermal warning temperature intervention: 90 °C
–
External thermal shut down temperature intervention: 100 °C
–
External thermal shut down hysteresis: 6°C
Cfil (typ 2.2nF)
to -Vs
Rsens
(not inductive resistor)
Typ. Values = 10 – 30 mOhm
Rfil (typ. 100 Ohm)
Rp1 (typ=4.7kOhm)
Rp2
Vrfil = Ispx1 x Rfil = 20mV Typ
SPx1 pin
SPx2 pin
TDA7571
Vp=100mV Typ
comparator
Imos
I
lim
1
Rsens
------------------ Vpx
Rp1
Rp2
+
()
Rp2
--------------------------------------------------
Vfil
+
=
I
lim
1
Rsens
------------------ Vpx
Vfil
+
()
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7572 | 功能描述:音頻放大器 200W Mono Bridge PWM Amplifier Built-In 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 |
| TDA7572TR | 功能描述:音頻放大器 200W Mono Bridge PWM Amplifier Built-In 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 |
| TDA7575 | 功能描述:音頻放大器 MULTI F DUAL 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 |
| TDA7575B | 功能描述:音頻放大器 2 x 75W Multifunct Dual-Bridge Pwr 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 |
| TDA7575BPD | 功能描述:音頻放大器 2 x 75W Multifunct Dual-Bridge Pwr 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 |
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