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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 15/30頁(yè) |
| 文件大?。?/td> | 810K |
| 代理商： | TS4972IJT |
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TS4972
Application Information
22/30
Regarding the load we have:
and
Then, the average current delivered by the supply
voltage is:
The power delivered by the supply voltage is
Psupply = Vcc IccAVG (W)
Then, the power dissipated by the amplifier is
Pdiss = Psupply - Pout (W)
and the maximum value is obtained when:
and its value is:
Remark : This maximum value is only depending
on power supply voltage and load values.
The efficiency is the ratio between the output
power and the power supply
The maximum theoretical value is reached when
Vpeak = Vcc, so
■ Decoupling of the circuit
Two capacitors are needed to bypass properly the
TS4972, a power supply bypass capacitor Cs and
a bias voltage bypass capacitor Cb.
Cs has especially an influence on the THD+N in
high frequency (above 7kHz) and indirectly on the
power supply disturbances.
With 100F, you can expect similar THD+N
performances like shown in the datasheet.
If Cs is lower than 100F, in high frequency
increases, THD+N and disturbances on the power
supply rail are less filtered.
To the contrary, if Cs is higher than 100F, those
disturbances on the power supply rail are more
filtered.
Cb has
an
influence on THD+N in
lower
frequency, but its function is critical on the final
result of PSRR with input grounded in lower
frequency.
If Cb is lower than 1F, THD+N increase in lower
frequency (see THD+N vs frequency curves) and
the PSRR worsens up
If Cb is higher than 1F, the benefit on THD+N in
lower frequency is small but the benefit on PSRR
is substantial (see PSRR vs. Cb curve : fig.12).
Note that Cin has a non-negligible effect on PSRR
in lower frequency. Lower is its value, higher is the
PSRR (see fig. 13).
■ Pop and Click performance
Pop and Click performance is intimately linked
with the size of the input capacitor Cin and the
bias voltage bypass capacitor Cb.
Size of Cin is due to the lower cut-off frequency
and PSRR value requested. Size of Cb is due to
THD+N and PSRR requested always in lower
frequency.
Moreover, Cb determines the speed that the
amplifier turns ON. The slower the speed is, the
softer the turn ON noise is.
The charge time of Cb is directly proportional to
the internal generator resistance 50k
.
Then, the charge time constant for Cb is
τb = 50kxCb (s)
As Cb is directly connected to the non-inverting
input (pin 2 & 3) and if we want to minimize, in
amplitude and duration, the output spike on Vout1
(pin 5), Cin must be charged faster than Cb. The
charge time constant of Cin is
τin = (Rin+Rfeed)xCin (s)
VOUT = VPEAK sinωt (V)
IOUT =
VOUT
R L
----------------- (A)
POUT =
VP EAK
2
2RL
---------------------- (W)
ICC
AVG
= 2
VPE AK
πRL
-------------------- (A)
Pdiss =
22Vcc
π RL
---------------------- POUT
POUT (W)
–
Pdiss
POUT
---------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
π
=
η =
POUT
Psupp ly
------------------------ = π
VPEAK
4VCC
-----------------------
π
4
----- = 78.5%
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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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