参数资料
型号: TS2007IQT
厂商: STMICROELECTRONICS
元件分类: 音频/视频放大
英文描述: 2.3 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8
封装: 3 X 3 MM, DFN-8
文件页数: 18/29页
文件大小: 464K
代理商: TS2007IQT
TS2007
Application information
25/29
4.10
Output filter considerations
The TS2007 is designed to operate without an output filter. However, due to very sharp
transients on the TS2007 output, EMI radiated emissions may cause some standard
compliance issues.
These EMI standard compliance issues can appear if the distance between the TS2007
outputs and loudspeaker terminal are long (typically more than 50mm, or 100mm in both
directions, to the speaker terminals). As 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 TS2007 output pins and the
speaker terminals.
Use a ground plane for “shielding” sensitive wires.
Place, as close as possible to the TS2007 and in series with each output, a ferrite bead
with a rated current of minimum 2.5A and impedance greater than 50
Ω at frequencies
above 30MHz. If, after testing, these ferrite beads are not necessary, replace them by a
short-circuit.
Allow extra footprint to place, if necessary, a capacitor to short perturbations to ground
(see Figure 51).
Figure 51.
Ferrite chip bead placement
In the case where the distance between the TS2007 output and the speaker terminals is too
long, it is possible to have low frequency EMI issues due to the fact that the typical operating
frequency is 280kHz. In this configuration, it is necessary to use the output filter represented
in Figure 1 on page 4 as close as possible to the TS2007.
to speaker
about 100pF
gnd
Ferrite chip bead
From TS2007 output
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