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参数资料
| 型号： | TS4962EIJT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封装： | LEAD FREE, FLIP CHIP, 9 PIN |
| 文件页数： | 20/37页 |
| 文件大小： | 834K |
| 代理商： | TS4962EIJT |
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TS4962
Application Information
27/37
4.3
Common mode feedback loop limitations
As explained previously, the common mode feedback loop allows the output DC bias voltage to
be averaged at Vcc/2 for any DC common mode bias input voltage.
page 2), the common mode feedback loop can ensure its role only within a defined range. This
range depends upon the values of Vcc and Rin (Av). To have a good estimation of the VICM
value, we can apply this formula (no tolerance on Rin):
with
and the result of the calculation must be in the range:
Due to the +/-9% tolerance on the 150k
resistor, it’s also important to check V
ICM in these
conditions:
If the result of VICM calculation is not in the previous range, input coupling capacitors must be
used (with Vcc from 2.4V to 2.5V, input coupling capacitors are mandatory).
For example:
With Vcc =3V, Rin = 150k and VIC = 2.5V, we found VICM = 2V typically and this is lower than
3V - 0.8V = 2.2V. With 136.5k
we found 1.97V and with 163.5k we have 2.02V. So, no input
coupling capacitors are required.
4.4
Low frequency response
If a low-frequency bandwidth limitation is requested, it’s possible to use input coupling
capacitors.
In the low frequency region, Cin (input coupling capacitor) starts to have an effect. Cin forms,
with Rin, a first-order high-pass filter with a -3dB cut-off frequency:
So, for a desired cut-off frequency, we can calculate Cin:
with Rin in and FCL in Hz.
)
V
(
)
k
150
R
(
2
k
150
V
2
R
Vcc
V
in
IC
in
ICM
+
×
×
+
×
=
V
IC
In
+
In
-
+
2
---------------------
(V)
=
V
8
.
0
Vcc
V
5
.
0
ICM
≤
)
k
5
.
163
R
(
2
k
5
.
163
V
2
R
Vcc
V
)
k
5
.
136
R
(
2
k
5
.
136
V
2
R
Vcc
in
IC
in
ICM
in
IC
in
+
×
×
+
×
≤
+
×
×
+
×
)
Hz
(
C
R
2
1
F
in
CL
×
π
×
=
)
F
(
F
R
2
1
C
CL
in
×
π
×
=
相关PDF资料 |
PDF描述 |
|---|---|
| TS4962EIKJT | 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| TS4962EKIJT | 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| TS4962IJT | 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| TS4962IQT | 2.8 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8 |
| TS4962MEIJT | 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4962EKIJT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3W Filter-free Class D Audio Power Amplifier |
| TS4962IJT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3W Filter-free Class D Audio Power Amplifier |
| TS4962IQ | 制造商:STMicroelectronics 功能描述: |
| TS4962IQT | 功能描述:音频放大器 3W Class D w/standby RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TS4962M | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3W filter-free class D audio power amplifier |
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