# TS4994IST STMicroelectronics, TS4994IST Datasheet - Page 27

#### TS4994IST

Manufacturer Part Number
TS4994IST
Description
IC AMP AUDIO PWR 1W MONO 8MSOP
Manufacturer
STMicroelectronics
Type
Class ABr
Datasheet

#### Specifications of TS4994IST

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1W x 1 @ 8 Ohm
Voltage - Supply
2.5 V ~ 5.5 V
Features
Depop, Differential Inputs, Short-Circuit and Thermal Protection, Standby
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
For Use With
497-6396 - BOARD EVAL FOR LV TS4984IQT497-6395 - BOARD EVAL FOR LP DIFF TS4994IQT
Lead Free Status / RoHS Status
Other names
497-4452-2

#### Available stocks

Company:
Part Number:
TS4994IST
Manufacturer:
ST
0
TS4994
Note:
and
Therefore, the average current delivered by the supply voltage is:
Equation 1
The power delivered by the supply voltage is:
Therefore, the power dissipated by each amplifier is:
Equation 2
and the maximum value is obtained when:
and its value is:
Equation 3
This maximum value is only dependent on the power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply:
Equation 4
The maximum theoretical value is reached when V
The maximum die temperature allowable for the TS4994 is 125°C. However, in case of
overheating, a thermal shutdown set to 150°C, puts the TS4994 in standby until the
temperature of the die is reduced by about 5°C.
P
P
supply
P
diss
diss
I
Pdiss
CC
η =
P
=
AVG = 2
=
out
=
η =
max
2 2V
---------------------- P
P
------------------ - =
P
V
π R
∂P
---------------- - = 0
=
supply
P
supply
CC
∂P
π
---- - = 78.5%
=
4
out
V
-------------------- - (W)
diss
2
peak
out
CC
2R
L
π
Vcc
2
V
---------------- - (A)
I
R
CC
πR
L
peak
L
2
P
2
--------------------
πV
PEAK
AVG
4V
L
out
out
(
W
peak
)
CC
P
out
= V
(W)
(W)
CC
, so:
Application information
27/35