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參數(shù)資料
| 型號： | TDA8920TH/N1,118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 80 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | PLASTIC, SOT-566-3, HSOP-24 |
| 文件頁數(shù)： | 36/36頁 |
| 文件大?。?/td> | 733K |
| 代理商： | TDA8920TH/N1,118 |
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2002 Sep 25
9
Philips Semiconductors
Product specication
2
× 80 W class-D power amplier
TDA8920
Application in a practical circuit:
Internal oscillator: Rosc connected from pin OSC to VSS
External oscillator: connect oscillator signal between pin
OSC and SGND; delete ROSC and COSC.
8.3
Protections
Temperature, supply voltage and short-circuit protections
sensors are included on the chip. In the event that the
maximum current or maximum temperature is exceeded
the system will shut down.
8.3.1
OVER-TEMPERATURE
If the junction temperature (Tj) exceeds 150 °C, then the
power stage will shut down immediately. The power stage
will start switching again if the temperature drops to
approximately 130
°C, thus there is a hysteresis of
approximately 20
°C.
8.3.2
SHORT-CIRCUIT ACROSS THE LOUDSPEAKER
TERMINALS AND TO SUPPLY LINES
When the loudspeaker terminals are short-circuited or if
one of the demodulated outputs of the amplifier is
short-circuited to one of the supply lines this will be
detected by the current protection. If the output current
exceeds the maximum output current of 7.5 A, then the
power stage will shut down within less than 1
s and the
high current will be switched off. In this state the
dissipation is very low. Every 100 ms the system tries to
restart again. If there is still a short-circuit across the
loudspeaker load or to one of the supply lines, the system
is switched off again as soon as the maximum current is
exceeded. The average dissipation will be low because of
this low duty cycle.
8.3.3
START-UP SAFETY TEST
During the start-up sequence, when the mode pin is
switched from standby to mute, the condition at the output
terminals of the power stage are checked. In the event of
a short-circuit at one of the output terminals to VDD or VSS
the start-up procedure is interrupted and the systems waits
for open-circuit outputs. Because the test is done before
enabling the power stages, no large currents will flow in the
event of a short-circuit. This system protects for
short-circuits at both sides of the output filter to both supply
lines. When there is a short-circuit from the power PWM
output of the power stage to one of the supply lines (before
the demodulation filter) it will also be detected by the
‘start-up safety test’. Practical use of this test feature can
be found in detection of short-circuits on the printed-circuit
board.
Remark: this test is only operational prior to or during the
start-up sequence, and not during normal operation.
During normal operation the maximum current protection
is used to detect short-circuits across the load and with
respect to the supply lines.
8.3.4
SUPPLY VOLTAGE ALARM
If the supply voltage falls below
±12.5 V the undervoltage
protection is activated and system shuts down correctly. If
the internal clock is used this switch-off will be silent and
without plop noise. When the supply voltage rises above
the threshold level the system is restarted again after
100 ms. If the supply voltage exceeds
±32 V the
overvoltage protection is activated and the power stages
shut down. They are re-enabled as soon as the supply
voltage drops below the threshold level.
An additional balance protection circuit compares the
positive (VDD) and the negative (VSS) supply voltages and
is triggered if the voltage difference between them
exceeds a certain level. This level depends on the sum of
both supply voltages. An expression for the unbalanced
threshold level is as follows: Vunb,thr ~ 0.15 × (VDD +VSS).
Example: with a symmetrical supply of
±30 V the
protection circuit will be triggered if the unbalance exceeds
approximately 9 V; see also Section 16.7.
8.4
Differential audio inputs
For a high common mode rejection ratio and a maximum
of flexibility in the application, the audio inputs are fully
differential. By connecting the inputs anti-parallel the
phase of one of the channels can be inverted, so that a
load can be connected between the two output filters.
In this case the system operates as a mono BTL amplifier
and with the same loudspeaker impedance an
approximately four times higher output power can be
obtained. The input configuration for mono BTL application
is illustrated in Fig.5; for more information see Chapter 16.
In the stereo single-ended configuration it is also
recommended to connect the two differential inputs in
anti-phase. This has advantages for the current handling
of the power supply at low signal frequencies.
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相關(guān)代理商/技術(shù)參數(shù) |
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| TDA8922 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 25 W class-D power amplifier |
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| TDA8922BJ | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 X 50 W class-D power amplifier |
| TDA8922BJ/N2,112 | 功能描述:音頻放大器 2X50W CLASSD 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 |
| TDA8922BTH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 X 50 W class-D power amplifier |
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