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參數(shù)資料
| 型號： | TS4890IS |
| 元件分類： | 音頻放大器 |
| 英文描述： | AUDIO AMPLIFIER|SINGLE|BIPOLAR|TSSOP|8PIN|PLASTIC |
| 中文描述： | 音頻放大器|單|雙極| TSSOP封裝| 8引腳|塑料 |
| 文件頁數(shù)： | 25/31頁 |
| 文件大?。?/td> | 432K |
| 代理商： | TS4890IS |
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TS4890
25/31
I
Power dissipation and efficiency
Hypothesis :
Voltage and current in the load are sinusoidal
(Vout and Iout)
Supply voltage is a pure DC source (Vcc)
Regarding the load we have :
V
and
and
Then, theaverage current delivered bythe supply
voltage is
The power delivered by the supply voltage is
Psupply = Vcc Icc
AVG
(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
P
OUT
=
η
The maximum theoretical value is reached when
Vpeak = Vcc, so
π
I
Decoupling of the circuit
Twocapacitors are needed to bypass properly the
TS4890. Apower 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 100
μ
F, you can expect similar THD+N
performances like shown in the datasheet.
If Cs is lower than 100
μ
F, in high frequency
increase THD+N and disturbances on the power
supply rail are less filtered.
To the contrary, if Cs is higher than 100
μ
F, those
disturbances on the power supply rail are more
filtered.
Cb
has aninfluence onTHD+N inlower frequency,
but itsfunction iscritical on thefinal result of PSRR
with input grounded in lower frequency.
If Cb is lower than 1
μ
F, THD+N increase in lower
frequency (see THD+N vs frequency curves) and
the PSRR worsens up
If Cb is higher than 1
μ
F, the benefit on THD+N in
lower frequency is small but the benefit on PSRR
is substantial (see PSRR vs. Cb curves).
Note that Cin has anon-negligible effect on PSRR
in lower frequency. Lower is its value, higher is the
PSRR (see fig. 13).
I
Pop and Click performance
In order to have the best performances with the
pop and click circuitry, the formula below must be
follow :
≤
τ
With
and
)
V
(
ω
sin
V
PEAK
OUT
=
)
A
(
R
V
I
L
OUT
OUT
=
)
W
(
R
2
V
P
L
2
PEAK
OUT
=
)
A
(
R
V
2
Icc
L
PEAK
π
AVG
=
)
W
(
P
P
R
Vcc
2
2
Pdiss
OUT
OUT
L
π
=
0
P
Pdiss
OUT
=
)
W
(
R
Vcc
2
π
2
max
Pdiss
L
2
=
Vcc
4
V
ply
sup
P
PEAK
π
=
%
5
78
4
=
b
in
τ
)
C
)
R
R
(
in
feed
in
in
×
+
=
τ
)
C
k
50
b
b
×
=
τ
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS4890IST | 功能描述:音頻放大器 1W Audio Power 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 |
| TS489IQT | 功能描述:音頻放大器 100mW Stereo 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 |
| TS489IST | 功能描述:音頻放大器 Popfree 100mW stereo headphone 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 |
| TS4900 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4900ID | 功能描述:音頻放大器 300mW Audio 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 |
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