TS4990IST STMicroelectronics, TS4990IST Datasheet - Page 18

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
TS4990IST
Manufacturer:
ST
Quantity:
56 000
Price:
Application information
4
4.1
4.2
4.3
18/32
Application information
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:
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.
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
terminal of the loudspeaker should be connected to V
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
out2
Single-ended output 1 = V
Single-ended output 2 = V
and V
is in phase with V
out1
feed
- V
out2
. It forms a low-pass filter with a -3 dB cut-off frequency. F
= 2V
in
in
out2
effect), the output voltage of the first stage is (in Volts):
and V
out
= -V
(V)
in
out1
out2
out1
CL
out1
G
starts to have an effect. C
V
v
V
out2
is in Hz.
F
= V
= -V
is phased 180° with V
v
=
out1
(V)
CH
) for more convenience is:
P
V
----------------------------------
F
out
out
out
out2
CL
=
V
=
(V)
out1
=
------------------------------------
2πR
(V)
V
=
(
in
(
------------------------------
V
V
2V
----------------------- -
2πR
feed
in
out1
=
out
)
1
R
Figure 1 on page
R
------------- -
2V
1
in
R
C
L
feed
RMS
C
=
in
feed
in
in
R
------------- -
2
)
out2
2
R
feed
R
------------- -
in
R
feed
in
in
and the negative to V
in
. This means that the positive
forms with R
4.
in
a high-pass filter
CH
is in Hz.
out1
feed
.
TS4990
) in

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