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  
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Application information
4
Application information
4.1
BTL configuration principle
The TS4990 is a monolithic power amplifier with a BTL output type. BTL (bridge tied load)
means that each end of the load is connected to two single-ended output amplifiers. Thus,
we have:
Single-ended output 1 = V
Single-ended output 2 = V
and V
- V
out1
The output power is:
For the same power supply voltage, the output power in BTL configuration is four times
higher than the output power in single-ended configuration.
4.2
Gain in a typical application
The typical application schematics are shown in
In the flat region (no C
For the second stage: V
The differential output voltage is (in Volts):
The differential gain named gain (G
V
is in phase with V
out2
terminal of the loudspeaker should be connected to V
4.3
Low and high frequency response
In the low frequency region, C
with a -3 dB cut-off frequency. F
In the high frequency region, you can limit the bandwidth by adding a capacitor (C
parallel with R
feed
18/32
= V
(V)
out1
out
= -V
(V)
out2
out
= 2V
(V)
out2
out
(
2V
P
=
------------------------------
out
effect), the output voltage of the first stage is (in Volts):
in
(
V
V
=
out1
in
= -V
(V)
out2
out1
V
V
=
out2
out1
) for more convenience is:
v
V
V
out2
out1
G
=
----------------------------------
v
V
in
and V
is phased 180° with V
in
out1
starts to have an effect. C
in
is in Hz.
CL
F
=
----------------------- -
CL
2πR
. It forms a low-pass filter with a -3 dB cut-off frequency. F
F
=
------------------------------------
CH
2πR
feed
2
)
out
RMS
R
L
Figure 1 on page
4.
R
feed
)
------------- -
R
in
R
feed
2V
------------- -
in
R
in
R
feed
------------- -
2
=
R
in
. This means that the positive
in
and the negative to V
out2
forms with R
a high-pass filter
in
in
1
C
in
in
CH
1
C
feed
TS4990
.
out1
) in
feed
is in Hz.