TS4990IST STMicroelectronics, TS4990IST Datasheet - Page 22

IC AMP AUDIO PWR 1.2W MONO 8MSOP

TS4990IST

Manufacturer Part Number
TS4990IST
Description
IC AMP AUDIO PWR 1.2W MONO 8MSOP
Manufacturer
STMicroelectronics
Type
Class ABr
Datasheet

Specifications of TS4990IST

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1.2W x 1 @ 8 Ohm
Voltage - Supply
2.2 V ~ 5.5 V
Features
Depop, Differential Inputs, Standby, Thermal Protection
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
For Use With
497-6383 - BOARD DEMO FOR TS4990
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-4451-2
Application information
4.8
4.9
22/32
Pop performance
Pop performance is intimately linked with the size of the input capacitor C
voltage bypass capacitor C
The size of C
The size of C
Moreover, C
near zero pop and click, the equivalent input constant time,
must not reach the τ
Figure 63. τ
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
with standard value which gives a lower cut-off frequency equal to 18.5 Hz. In this case,
(R
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.
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.
in
+ 2kΩ) x C
τ
in
in
= (R
= 22 kΩ and a 20 Hz, -3 dB low cut-off frequency, C
b
in
in
b
determines the speed with which the amplifier turns ON. In order to reach
in
+ 2kΩ) x C
is dependent on THD+N and PSRR values requested at lower frequencies.
in
is dependent on the lower cut-off frequency and PSRR values requested.
max. versus bypass capacitor
= 9.36ms. By referring to the previous graph, if C
in
Figure 64
and the gain benefits both the pop phenomenon, and the cost and size
in
maximum value as indicated in
160
120
in
80
40
0
b
(s) with R
.
Tamb=25
show how to configure the TS4990 to work in differential input
°
1
C
in
Vcc=2.6V
Bypass Capacitor Cb ( F)
G
5kΩ
VDIFF
2
=
Vcc=3.3V
2
R
------ -
R
2
1
3
Figure 63
Vcc=5V
in
= 361 nF. So, C
4
below.
b
= 1 µF and V
1
and R
in
2
and the bias
should be
in
= 390 nF
CC
= 5 V,
TS4990

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