TS4990EKIJT STMICROELECTRONICS [STMicroelectronics], TS4990EKIJT Datasheet - Page 21

• Manufacturer Part Number: TS4990EKIJT
• Description: 1.2 W audio power amplifier with active low standby mode
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

TS4990
4.6
Note:
4.7
Wake-up time (t
When the standby is released to put the device ON, the bypass capacitor C
immediately. Because C
properly until the C
or t
If C
time.
Figure 61. Typical wake-up time vs. C
Due to process tolerances, the maximum value of wake-up time is shown in
Figure 62. Maximum wake-up time vs. C
The bypass capacitor C
time with this tolerance, refer to the graph above (considering for example for C
range of 0.8 µF
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 V
allows a quick discharge of C
WU
b
has a value other than 1 µF, refer to the graph in
and specified in the electrical characteristics tables with C
≤
C
b
b
≤
1.2 µF).
voltage is correct. The time to reach this voltage is called wake-up time
WU
b
b
also has a typical tolerance of +/-20%. To calculate the wake-up
600
500
400
300
200
100
is directly linked to the bias of the amplifier, the bias will not work
600
500
400
300
200
100
0
)
in
0
0.1
0.1
b
Tamb=25 ° C
pin are short-circuited to ground by internal switches. This
Tamb=25 ° C
and C
1
1
in
Vcc=2.6V
capacitors.
Bypass Capacitor Cb ( F)
Vcc=2.6V
Bypass Capacitor Cb ( F)
b
b
2
2
Vcc=3.3V
Vcc=3.3V
3
3
Figure 61
Vcc=5V
Vcc=5V
4
4
to establish the wake-up
b
4.7
Application information
= 1 µF.
4.7
b
Figure
is not charged
b
=1 µF in the
62.
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