參數(shù)資料
型號(hào)： TS4995EIJT
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9
封裝： LEAD FREE, FCP-9
文件頁數(shù)： 13/26頁
文件大?。?/td> 440K
代理商： TS4995EIJT
Application information
TS4995
20/26
4.5
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4995: a power supply bypass
capacitor CS and a bias voltage bypass capacitor Cb.
The CS capacitor has particular influence on the THD+N at high frequencies (above 7 kHz)
and an indirect influence on power supply disturbances. With a value for CS of 1 F, one can
expect THD+N performance similar to that shown in the datasheet.
In the high frequency region, if CS is lower than 1 F, then THD+N increases and
disturbances on the power supply rail are less filtered.
On the other hand, if CS is greater than 1 F, then those disturbances on the power supply
rail are more filtered.
The Cb capacitor has an influence on the THD+N at lower frequencies, but also impacts
PSRR performance (with grounded input and in the lower frequency region).
4.6
Wake-up time tWU
When the standby is released to put the device ON, the bypass capacitor Cb is not charged
immediately. Because Cb is directly linked to the bias of the amplifier, the bias will not work
properly until the Cb voltage is correct. The time to reach this voltage is called the wake-up
time or tWU and is specified in Table 4 on page 5, with Cb=1 F. During the wake-up phase,
the TS4995 gain is close to zero. After the wake-up time, the gain is released and set to its
nominal value.
If Cb has a value different from 1 F, then refer to the graph in Figure 57 to establish the
corresponding wake-up time.
Figure 57.
Startup time vs. bypass capacitor
0.00.4
0.81.2
1.62.0
0
5
10
15
Tamb=25
°C
Vcc=2.6V
Vcc=3.3V
Vcc=5V
S
ta
rtu
p
T
ime
(ms
)
Bypass Capacitor Cb (
μF)
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