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參數(shù)資料
| 型號： | TS2012IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-20 |
| 文件頁數(shù)： | 16/30頁 |
| 文件大小： | 384K |
| 代理商： | TS2012IQT |
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TS2012
Application information
23/30
4.4
Low frequency response
If a low frequency bandwidth limitation is required, it is possible to use input coupling
capacitors. In the low frequency region, the input coupling capacitor Cin starts to have an
effect. Cin forms, with the input impedance Zin, a first order high-pass filter with a -3dB cut-
So, for a desired cut-off frequency FCL Cin is calculated as follows:
with FCL in Hz, Zin in Ω and Cin in F.
The input impedance Zin is for the whole power supply voltage range, typically 30kΩ . There
the tolerance of the FCL:
●
4.5
Decoupling of the circuit
Power supply capacitors, referred to as CS,CSL,CSR are needed to correctly bypass the
TS2012.
The TS2012 has a typical switching frequency of 280kHz and output fall and rise time about
5ns. Due to these very fast transients, careful decoupling is mandatory.
A 1F ceramic capacitor between each PVCC and PGND and also between AVCC and
AGND is enough, but they must be located very close to the TS2012 in order to avoid any
extra parasitic inductance created by a long track wire. Parasitic loop inductance, in relation
with di/dt, introduces overvoltage that decreases the global efficiency of the device and may
cause, if this parasitic inductance is too high, a TS2012 breakdown.
In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its
current capability is also important. A 0603 size is a good compromise, particularly when a
4
Ω load is used.
Another important parameter is the rated voltage of the capacitor. A 1F/6.3V capacitor
used at 5V, loses about 50% of its value. With a power supply voltage of 5V, the decoupling
value, instead of 1F, could be reduced to 0.5F. As CS has particular influence on the
THD+N in the medium to high frequency region, this capacitor variation becomes decisive.
In addition, less decoupling means higher overshoots which can be problematic if they reach
the power supply AMR value (6V).
F
CL
1
2
π Z
in
C
in
--------------------------------------------
=
C
in
1
2
π Z
in
F
CL
----------------------------------------------
=
F
CLmax
1.103
F
CL
=
F
CLmin
0.915
F
CL
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS2012IQT-CUT TAPE | 制造商:ST 功能描述:TS2012 Series 2.8 W Filter-Free Stereo Class D Audio Power Amplifier - QFN-20 |
| TS2012-W1 | 制造商:Black Box Corporation 功能描述:1 YEAR WARRANTY FOR TS2012 |
| TS2012-W3 | 制造商:Black Box Corporation 功能描述:3 YEAR WARRANTY FOR TS2012 |
| TS2015-W1 | 制造商:Black Box Corporation 功能描述:1 YEAR WARRANTY FOR TS2015 |
| TS2015-W3 | 制造商:Black Box Corporation 功能描述:3 YEAR WARRANTY FOR TS2015 |
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