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參數(shù)資料
| 型號： | TS4972IJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封裝： | FLIP CHIP, 8 PIN |
| 文件頁數(shù)： | 14/30頁 |
| 文件大?。?/td> | 810K |
| 代理商： | TS4972IJT |
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Application Information
TS4972
21/30
■ BTL Configuration Principle
The TS4972 is a monolithic power amplifier with a
BTL output type. BTL (Bridge Tied Load)
means that each end of the load is connected
to two single ended output amplifiers. Thus, we
have :
Single ended output 1 = Vout1 = Vout (V)
Single ended output 2 = Vout2 = -Vout (V)
And Vout1 - Vout2 = 2Vout (V)
The output power is:
For the same power supply voltage, the output
power in BTL configuration is four times higher
than
the
output
power
in
single
ended
configuration.
■ Gain In Typical Application Schematic
(cf. page 1)
In flat region (no effect of Cin), the output voltage
of the first stage is:
For the second stage : Vout2 = -Vout1 (V)
The differential output voltage is:
The differential gain named gain (Gv) for more
convenient usage is:
Remark : Vout2 is in phase with Vin and Vout1 is
180 phased with Vin. It means that the positive
terminal
of
the
loudspeaker
should
be
connected to Vout2 and the negative to Vout1.
■ Low and high frequency response
In low frequency region, the effect of Cin starts.
Cin with Rin forms a high pass filter with a -3dB
cut off frequency.
In high frequency region, you can limit the
bandwidth by adding a capacitor (Cfeed) in
parallel on Rfeed. Its form a low pass filter with
a -3dB cut off frequency.
■ Power dissipation and efficiency
Hypothesis :
Voltage and current in the load are
sinusoidal (Vout and Iout)
Supply voltage is a pure DC source (Vcc)
Figure 82: Flip-Chip 300m Demoboard Top
Solder Layer
Figure 83: Flip-Chip 300m Demoboard
Bottom Solder Layer
)
W
(
R
)
Vout
2
(
Pout
L
2
RMS
=
Vout1 = Vin
–
Rfeed
Rin
-------------------- (V)
Vout2
Vout1 = 2Vin
–
R feed
Rin
-------------------- (V)
Gv =
Vout2
Vout1
–
Vin
--------------------------------------- = 2
R feed
Rin
--------------------
FCL =
1
2
π Rin Cin
--------------------------------
H z
()
FCH =
1
2
π Rfeed Cfeed
-----------------------------------------------
Hz
()
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| TS4973EIJT | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS4972JT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4973 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W TWO AUDIO INPUTS WITH GAIN CONTROL POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4973EIJT | 功能描述:音頻放大器 1.2W 2 audio inputs 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 |
| TS4973IJT | 制造商:STMicroelectronics 功能描述: |
| TS4974 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1W Differential Audio Power Amplifier with Up/Down Digital Volume Control Pins |
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