參數(shù)資料
型號: TSDC05EIJT
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): 14/32頁
文件大小: 714K
代理商: TSDC05EIJT
TS4990
Application information
21/32
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 wake-up time
or tWU and specified in the electrical characteristics tables with Cb =1F.
If Cb has a value other than 1 F, refer to the graph in Figure 61 to establish the wake-up
time.
Figure 61.
Typical wake-up time vs. Cb
Due to process tolerances, the maximum value of wake-up time is shown in Figure 62.
Figure 62.
Maximum wake-up time vs. Cb
Note:
The bypass capacitor Cb also has a typical tolerance of +/-20%. To calculate the wake-up
time with this tolerance, refer to the graph above (considering for example for Cb=1 F in the
range of 0.8 F
Cb1.2 F).
4.7
Standby time
When the standby command is set, the time required to put the two output stages in high
impedance and the internal circuitry in standby mode is a few microseconds. In standby
mode, the bypass pin and Vin pin are short-circuited to ground by internal switches. This
allows a quick discharge of Cb and Cin capacitors.
12
34
0
100
200
300
400
500
600
4.7
0.1
Tamb=25
°C
Vcc=2.6V
Vcc=3.3V
Vcc=5V
St
ar
tup
Ti
me
(
m
s)
Bypass Capacitor Cb ( F)
12
34
0
100
200
300
400
500
600
Tamb=25
°C
4.7
0.1
Vcc=5V
Vcc=3.3V
Vcc=2.6V
Max.
St
ar
tup
Ti
me
(
m
s)
Bypass Capacitor Cb ( F)
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