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參數(shù)資料
| 型號： | TS4961TIQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, QCC16 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 35/49頁 |
| 文件大小： | 1351K |
| 代理商： | TS4961TIQT |
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Application component information
TS4961T
40/49
4.8
Output filter considerations
The TS4961T is designed to operate without an output filter. However, due to very sharp
transients on the TS4961T output, EMI radiated emissions may cause some standard
compliance issues.
These EMI standard compliance issues can appear if the distance between the TS4961T
outputs and loudspeaker terminal are long (typically more than 50 mm, or 100 mm in both
directions, to the speaker terminals). Since the PCB layout and internal equipment device
are different for each configuration, it is difficult to provide a one-size-fits-all solution.
However, to decrease the probability of EMI issues, there are several simple rules to follow.
●
Reduce, as much as possible, the distance between the TS4961T output pins and the
speaker terminals.
●
Use ground planes for shielding sensitive wires.
●
Place, as close as possible to the TS4961T and in series with each output, a ferrite
bead with a rated current of 2.5 A minimum, and impedance greater than 50
Ω at
frequencies above 30 MHz. If, after testing, these ferrite beads are not necessary,
replace them by a short circuit.
●
Allow enough footprint to place, if necessary, a capacitor to short perturbations to
ground as shown in Figure 78.
Figure 78.
Output filter for shorting pertubations to ground
In the case where the distance between the TS4961T outputs and speaker terminals is high,
it is possible to have low frequency EMI issues due to the fact that the typical operating
frequency is 250 kHz.
In this configuration, it is recommended to use an output filter. It should be placed as close
as possible to the TS4961T.
Ferrite chip bead
about 100pF
Gnd
From TS4961T output
To speaker
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