參數(shù)資料
型號： TDA7564B
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 50 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM25
封裝： ROHS COMPLIANT, FLEXIWATT-25
文件頁數(shù)： 8/34頁
文件大?。?/td> 493K
代理商： TDA7564B
Diagnostics functional description
TDA7564B
Doc ID 12734 Rev 3
4.2
Permanent diagnostics
Detectable conventional faults are:
–
Short to GND
–Short to VS
–
Short across the speaker
The following additional features are provided:
–
Output offset detection
The TDA7564B has 2 operating statuses:
1.
Restart mode. The diagnostic is not enabled. Each audio channel operates
independently from each other. If any of the a.m. faults occurs, only the channel(s)
interested is shut down. A check of the output status is made every 1 ms (Figure 25).
Restart takes place when the overload is removed.
2.
Diagnostic mode. It is enabled via I2C bus and self activates if an output overload
(such to cause the intervention of the short-circuit protection) occurs to the speakers
outputs. Once activated, the diagnostics procedure develops as follows (Figure 26):
–
To avoid momentary re-circulation spikes from giving erroneous diagnostics, a
check of the output status is made after 1ms: if normal situation (no overloads) is
detected, the diagnostic is not performed and the channel returns back active.
–
Instead, if an overload is detected during the check after 1 ms, then a diagnostic
cycle having a duration of about 100 ms is started.
–
After a diagnostic cycle, the audio channel interested by the fault is switched to
restart mode. The relevant data are stored inside the device and can be read by
the microprocessor. When one cycle has terminated, the next one is activated by
an I2C reading. This is to ensure continuous diagnostics throughout the car-radio
operating time.
–
To check the status of the device a sampling system is needed. The timing is
chosen at microprocessor level (over half a second is recommended).
Figure 25. Restart timing without diagnostic enable (permanent) - Each 1mS time, a
sampling of the fault is done
Figure 26. Restart timing with diagnostic enable (permanent)
t
1-2mS
1mS
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
Short circuit removed
Out
t
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
Short circuit removed
1-2mS
100/200mS
1mS
相關(guān)PDF資料
PDF描述
TDA7564BPDTR 50 W, 4 CHANNEL, AUDIO AMPLIFIER, PDSO36
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7564BH 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
TDA7564BPD 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
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
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