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參數(shù)資料
| 型號(hào)： | TS2007IQT |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 3W filter-free Class D audio power amplifer with 6-12dB fixed gain select |
| 中文描述： | 3W無濾波器D類音頻放大器6 - 12dB的固定增益選擇 |
| 文件頁數(shù)： | 23/29頁 |
| 文件大?。?/td> | 407K |
| 代理商： | TS2007IQT |
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TS2007
Application information
23/29
So, for a desired cut-off frequency F
CL
we can calculate C
in
:
with F
CL
in Hz, Z
in
in
Ω
and C
in
in F.
The input impedance Z
in
is for the whole power supply voltage range, typically 75k
Ω
. There
is also a tolerance around the typical value (see
Table 5
to
Table 9
). With regard to the
tolerance, you can also calculate tolerance of the F
CL
:
F
CLmax
1.103
F
CL
=
●
●
4.5
Decoupling of the circuit
A power supply capacitor, referred to as C
S,
is needed to correctly bypass the TS2007.
The TS2007 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 1μF ceramic capacitor is enough, but it must be located very close to the TS2007 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 TS2007 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 1μF/6.3V capacitor
used at 5V, loses about 50% of its value. With a power supply voltage of 5V, the decoupling
value, instead of 1μF, could be reduced to 0.5μF. As C
S
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).
4.6
Wake-up time (t
wu
)
When the standby is released to set the device ON, there is a wait of 5ms typically. The
TS2007 has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
Note:
The gain increases smoothly (see
Figure 49
) from the mute to the gain selected by the GS
pin (
Section 4.2
).
F
CL
Z
in
2
π
C
in
--------------------------------------------
=
C
in
Z
in
2
π
F
CL
---------------------------------------------
=
F
CLmin
0.915
F
CL
=
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