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參數(shù)資料
| 型號(hào)： | TDA7372A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Power Amplifier for Car Radio(用于汽車收音機(jī)的4×6W功率放大器) |
| 中文描述： | 功率放大器（用于汽車收音機(jī)的4 × 6W功率放大器車用收音機(jī)） |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 169K |
| 代理商： | TDA7372A |
FUNCTIONAL DESCRIPTION
Function
Description
GENERAL
The TDA7372A is a quad channel single package audio power amplifier intended to reduce the
mismatch in the electrical characteristics among the four different channels and to consistently
drop the external component count. It contains four non inverting stages capable to operate
down to 20dB gain so minimizing the output noise and optimizing SVR and distortion.
The output stage is a single ended type suitable to drive 4
loads. It consists of a class AB fully
complementary PNP/NPN stages short circuit protected.
A rail to rail output swing is achieved without need of boostrap capacitors. Moreover, the
external compensation is not necessary.
The device features a St-BY function which shuts down the internal bias generators when the
ST-BY input is low. In ST-BY mode the amplifiersinks a smallcurrent (in the range of few
μ
As).
When the St-BYpin is high the IC becomes fully operational.
A mute function is also provided. This reduces the gain of the input stage to a level effectively
eliminating any audio input influence on the output stage when the mute line is low. When the
mute line is high the normal input path is restored.
The device goes automatically into mute state when the supply voltage goes below the
minimum allowable value. This prevents pop noises whenever the battery voltage drops below
a fixed threshold. When the supply voltage rises to it nominal value the device recoversthe play
condition with a delay fixed by the C
SVR
capacitor.
The Thermal protection principle involves two different steps
a) Soft thermal limitation
b) Shutdown
As long as the junction temperature remains below a preset threshold, the I.C. will deliver the
full power. Once the threshold has been reached, the device automatically goes into mute
status. The play to mute transition is internally controlled so producing a soft muting without
unpleasant effect. Supposing the junction temperature does not reduce to safe levels, a
complete shutdown will occur.
A built-inprotection circuit assures reliable and safe operation in presence of:
- AC short circuit to GND
- DC short circuit to GND and to V
S
duringpower-on phase
The DC short protector acts in a way to avoid that the device is being turned on (by ST-BY)
when a DC short is present from OUT to GND or OUT to V
S
. Due to this reason it is necessary
to introducea proper delay on the st-by pin (expecially when it is driven by V
S
.)
Moreover, as the involved circuitry is normally disabled when a current higher than 5mA is fed
into the st-by pin, it is important, in order not to disable it, to have the external current source
driving the pin itself limited to 5mA. (figure 1 is shows the relevant waveforms).
OUTPUT STAGE
ST-BY
MUTE
THERMAL
PROTECTION
BUILT-IN SHORT
CIRCUIT
PROTECTION
Figure15:
Fault (DC short) waveforms
TDA7372A
8/10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7372B | 4 x 6W Power Amplifier for Car Radio(4×6W用于汽車收音機(jī)的功率放大器) |
| TDA7374B | Dual Bridge Audio Amplifier for Car Radio(用于車載電臺(tái)的雙通道橋式音頻放大器) |
| TDA7374 | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7374BV | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7375AH | 2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7372B | 功能描述:音頻放大器 4X6W Power Amplifier 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 |
| TDA7374 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual bridge audio amplifier for car radio |
| TDA7374_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual bridge audio amplifier for car radio |
| TDA7374B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7374BV | 功能描述:音頻放大器 Quad Power Amplifier 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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