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參數(shù)資料
| 型號： | TS4998IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 19/33頁 |
| 文件大?。?/td> | 488K |
| 代理商： | TS4998IQT |
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Application information
TS4998
26/33
4.9
Standby control and wake-up time tWU
The TS4998 has two dedicated standby pins (STBYL, STBYR). These pins allow to put
each channel in standby mode or active mode independently. The amplifier is designed to
reach close to zero pop when switching from one mode to the other.
When both channels are in standby (VSTBYL = VSTBYR = GND), the circuit is in shutdown
mode. When at least one of the two standby pins is released to put the device ON, the
bypass capacitor Cb starts to be charged. 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
During the wake-up phase, the TS4998 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 1F, then refer
to the graph in Figure 66 to establish the corresponding wake-up time.
When a channel is set to standby mode, the outputs of this channel are in high impedance
state.
Figure 66.
Typical startup time vs. bypass capacitor
4.10
Shutdown time
When the standby command is activated (both channels put into standby mode), the time
required to put the two output stages of each channel in high impedance and the internal
circuitry in shutdown mode is a few microseconds.
Note:
In shutdown mode when both channels are in standby, the Bypass pin and LIN+, LIN-, RIN+,
RIN- pins are shorted to ground by internal switches. This allows a quick discharge of Cb and
CIN capacitors.
Pop performance
Due to its fully differential structure, the pop performance of the TS4998 is close to perfect.
However, due to mismatching between internal resistors Rfeed, external resistors RIN and
0.00.5
1.01.5
2.02.5
3.03.5
4.04.5
30
40
50
60
70
80
90
100
Tamb=25
°C
Vcc=2.7V
Vcc=3.3V
Vcc=5V
Sta
rtup
Ti
me
(ms)
Bypass Capacitor Cb (
μF)
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