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参数资料
| 型号： | TS4962MEIJT |
| 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： | ROHS COMPLIANT, FCP-9 |
| 文件页数： | 22/41页 |
| 文件大小： | 1104K |
| 代理商： | TS4962MEIJT |
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TS4962M
Application information
29/41
5.3
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 3), the common mode feedback loop can ensure its role only within a defined range.
This range depends upon the values of VCC and Rin (AVdiff). 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
Ω resistor, it’s also important to check Vicm 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 typically find Vicm = 2V and this is lower than
3V - 0.8V = 2.2V. With 136.5k
Ωwe find 1.97V, and with 163.5kΩwe have 2.02V. So, no input
coupling capacitors are required.
5.4
Low frequency response
If a low frequency bandwidth limitation is requested, it is 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 Ω and FCL in Hz.
V
icm
V
CC
R
in
×
2V
IC
×
150k
Ω
×
+
2R
in
150k
Ω
+
()
×
------------------------------------------------------------------------------
(V)
=
V
IC
In
+
In
-
+
2
---------------------
(V)
=
0.5V
V
icm
V
CC
0.8V
–
≤≤
V
CC
R
in
×
2V
IC
×
136.5k
Ω
×
+
2R
in
136.5k
Ω
+
()
×
-----------------------------------------------------------------------------------
V
icm
V
CC
R
in
×
2V
IC
×
163.5k
Ω
×
+
2R
in
163.5k
Ω
+
()
×
-----------------------------------------------------------------------------------
≤≤
F
CL
1
2
π R
in
×
C
in
×
--------------------------------------
(Hz)
=
C
in
1
2
π R
in
×
F
CL
×
----------------------------------------
(F)
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4962MEIKJT | 功能描述:3 W FILTER-FREE CLASS D AUDIO PO 制造商:stmicroelectronics 系列:- 包装:剪切带（CT） 零件状态:在售 类型:D 类 输出类型:1-通道（单声道） 不同负载时的最大输出功率 x 通道数:2.8W x 1 @ 4 欧姆 电压 - 电源:2.4 V ~ 5.5 V 特性:消除爆音，差分输入，待机，热保护 工作温度:-40°C ~ 85°C（TA） 供应商器件封装:9-覆晶 封装/外壳:9-UFBGA 标准包装:1 |
| TS4972 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4972_04 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W Audio Power Amplifier with Standby Mode Active High |
| TS4972EIJT | 功能描述:音频放大器 1.2W audio power amp 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 |
| TS4972EIJT1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W Audio Power Amplifier with Standby Mode Active High |
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