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參數(shù)資料
| 型號： | TDA7564BPD |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 50 W, 4 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封裝： | ROHS COMPLIANT, SOP-36 |
| 文件頁數(shù)： | 13/34頁 |
| 文件大小： | 493K |
| 代理商： | TDA7564BPD |
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Thermal protection
TDA7564B
Doc ID 12734 Rev 3
6
Thermal protection
Thermal protection is implemented through thermal foldback (Figure 29).
Thermal foldback begins limiting the audio input to the amplifier stage as the junction
temperatures rise above the normal operating range. This effectively limits the output power
capability of the device thus reducing the temperature to acceptable levels without totally
interrupting the operation of the device.
The output power will decrease to the point at which thermal equilibrium is reached.
Thermal equilibrium will be reached when the reduction in output power reduces the
dissipated power such that the die temperature falls below the thermal foldback threshold.
Should the device cool, the audio level will increase until a new thermal equilibrium is
reached or the amplifier reaches full power. Thermal foldback will reduce the audio output
level in a linear manner.
Three thermal warning are available through the I2C bus data.
Figure 29. Thermal foldback diagram
6.1
I2C programming/reading sequences
A correct turn on/off sequence respectful of the diagnostic timings and producing no audible
noises could be as follows (after battery connection):
Turn-on: (standby out + diag enable) --- 500 ms (min.) --- muting out
Turn-off: muting in --- 20 ms --- (diag disable + standby in)
Car radio Installation: diag enable (write) --- 200 ms --- I2C read (repeat until all faults
disappear).
AC test: feed h.f. tone -- AC diag enable (write) --- wait > 3 cycles --- I2C read
(repeat I2C reading until tweeter-off message disappears).
Offset test: device in play (no signal) -- offset enable - 30ms - I2C reading
(repeat I2C reading until high-offset message disappears).
Tj ( °C)
TH. SH.
START
TH. SH.
END
Vout
TH. WARN.
ON
Tj ( °C)
Vout
Tj ( °C)
SD
(with same input
signal)
< TSD
CD out
TH. WARN.
ON
TH. WARN.
ON
125°
140°
155°
> T
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7564 | 46 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TDA7565 | 40 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM27 |
| TDA7566 | 60 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM25 |
| TDA7567PDTR | AUDIO AMPLIFIER, PDSO36 |
| TDA7567PD | AUDIO AMPLIFIER, PDSO36 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7564BPDTR | 功能描述:音頻放大器 4 x 50W Multi Quad Power Amplifer D 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 |
| TDA7565 | 功能描述:音頻放大器 Quad Power Amplifier Built-in Volt Conv 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 |
| TDA7565_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Quad power amplifier with built-in voltage converter |
| TDA7565_10 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Quad power amplifier with integrated step-up converter |
| TDA7566 | 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 |
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