IC AMP AUDIO PWR 1.2W MONO 8MSOP

TS4990IST

Manufacturer Part NumberTS4990IST
DescriptionIC AMP AUDIO PWR 1.2W MONO 8MSOP
ManufacturerSTMicroelectronics
TypeClass AB
TS4990IST datasheet
 

Specifications of TS4990IST

Output Type1-Channel (Mono)Max Output Power X Channels @ Load1.2W x 1 @ 8 Ohm
Voltage - Supply2.2 V ~ 5.5 VFeaturesDepop, Differential Inputs, Standby, Thermal Protection
Mounting TypeSurface MountPackage / Case8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
For Use With497-6383 - BOARD DEMO FOR TS4990Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other names497-4451-2  
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Page 21
22
Page 22
23
Page 23
24
Page 24
25
Page 25
26
Page 26
27
Page 27
28
Page 28
29
Page 29
30
Page 30
31
32
Page 22/32

Download datasheet (715Kb)Embed
PrevNext
Application information
4.8
Pop performance
Pop performance is intimately linked with the size of the input capacitor C
voltage bypass capacitor C
The size of C
is dependent on the lower cut-off frequency and PSRR values requested.
in
The size of C
is dependent on THD+N and PSRR values requested at lower frequencies.
b
Moreover, C
determines the speed with which the amplifier turns ON. In order to reach
b
near zero pop and click, the equivalent input constant time,
τ
= (R
+ 2kΩ) x C
in
in
must not reach the τ
Figure 63. τ
max. versus bypass capacitor
in
By following the previous rules, the TS4990 can reach near zero pop and click even with
high gains such as 20 dB.
Example:
With R
= 22 kΩ and a 20 Hz, -3 dB low cut-off frequency, C
in
with standard value which gives a lower cut-off frequency equal to 18.5 Hz. In this case,
(R
+ 2kΩ) x C
= 9.36ms. By referring to the previous graph, if C
in
in
we read 20 ms max. This value is twice as high as our current value, thus we can state that
pop and click will be reduced to its lowest value.
Minimizing both C
of the application.
4.9
Application example: differential input, BTL power amplifier
The schematics in
mode. The gain of the amplifier is:
In order to reach the best performance of the differential function, R
matched at 1% max.
22/32
.
b
(s) with R
5kΩ
in
in
maximum value as indicated in
in
°
Tamb=25
C
160
120
Vcc=2.6V
80
40
0
1
2
Bypass Capacitor Cb ( F)
and the gain benefits both the pop phenomenon, and the cost and size
in
Figure 64
show how to configure the TS4990 to work in differential input
G
=
VDIFF
and the bias
in
Figure 63
below.
Vcc=3.3V
Vcc=5V
3
4
= 361 nF. So, C
in
in
= 1 µF and V
b
R
2
------ -
2
R
1
and R
should be
1
2
TS4990
= 390 nF
= 5 V,
CC