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參數(shù)資料
| 型號(hào)： | TDA7298 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 音頻放大器 |
| 英文描述： | 28W Hi-Fi AUDIO POWER AMPLIFIER WITH MUTE / STAND-BY |
| 中文描述： | 28W高保真音頻功率放大器，具有靜音/備用 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大小： | 148K |
| 代理商： | TDA7298 |
SHORT-CIRCUIT PROTECTION
The TDA7298 has an original circuit which pro-
tects the device during accidental short-circuit be-
tween output and GND / -Vs / +Vs, taking it in
STAND-BY mode, so limiting also dangerous DC
current flowing throught the loudspeaker.
If a short-circuit or an overload dangerousfor the
final transistors are detected, the concernedSOA
circuit sends out a signal to the latching circuit
(with a 10
μ
s delay time that prevents fast random
spikes from inadvertently shutting the amplifier
off) which makes Q
1
and Q
2
saturate (see Block
Diagram). Q
1
immediately short-circuits to ground
the A point turning the final stage off while Q
2
short-circuits to ground the external capacitor
driving the pin 3 (Mute/Stand-by) towards zero
potential.
Only when the pin 3 voltage becomes lower than
1V, the latching circuit is allowed to reset itself
and restart the amplifier, provided that the short-
circuit condition has been removed. In fact, a win-
dow comparator is present at the output and it is
aimed at preventingthe amplifier from restarting if
the output voltageis lower than 0.35 Total Supply
Voltage or higher than 0.65 Total Supply Voltage.
If the output voltage lies between these two
thresholds, one may reasonably suppose the
short-circuit has been removed and the amplifier
may start operatingagain.
The PLAY/MUTE/STAND-BY function pin (pin 3)
is both ground- and positive supply-compatible
and can be interfacedby means of the R
5
, C
3
net
either to a TTL or CMOS output (
μ
-Processor) or
to a specificapplication circuit.
The R
5
, C
3
net is fundamental,because connect-
ing this pin directly to a low output impedance
driver such as TTL gate would prevent the correct
operation during a short-circuit. Actually a final
stage overload turns on the protection latching
circuit that makes Q
2
try to drive the pin 3 voltage
under 0.8 V. Since the maximum current this pin
can stand is 3 mA, one must make sure the fol-
lowing condition is met:
R
5
≥
(
V
A
0.7V
)
3mA
that yields: R
5, min
= 1.5 K
withV
A
=5V.
In order to prevent pop-on and -off transients, it is
advisable to calculate the C
3
, R
5
net in such a
way that the STAND-BY/MUTE and MUTE/PLAY
threshold crossing slope (positive at the turn-on
and vice-versa)is less than 100 V/sec.
Figure16:
ThermalProtectionBlockDiagram
THERMAL PROTECTION
The thermal protection operates on the 125
μ
A
current generator, linearly decreasing its value
from 90
°
C on. By doing this, the A voltage slowly
decreases thus switching the amplifier first to
MUTE (at
145
°
C) and then
(155
°
C).
to STAND-BY
Figure17:
Maximum Allowable Power Dissipa-
tion vs. Ambient Temperature.
The maximum allowable power dissipation de-
pends on the size of the external heatsink (ther-
mal resistance case-ambient); figure 17 shows
the dissipable power as a function of ambient
temperaturefor differentthermal resistance.
TDA7298
9/11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7298V | 功能描述:音頻放大器 28W Hi-Fi 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 |
| TDA7299 | 功能描述:音頻放大器 2W Mono 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 |
| TDA729913TR | 功能描述:音頻放大器 SOUND 2W MONO 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 |
| TDA7300 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DIGITAL CONTROLLED STEREO AUDIO PROCESSOR |
| TDA7300D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DIGITAL CONTROLLED STEREO AUDIO PROCESSOR |
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