DEMOTS4956J STMicroelectronics, DEMOTS4956J Datasheet - Page 42
DEMOTS4956J
Manufacturer Part Number
DEMOTS4956J
Description
BOARD DEMO TS4956EIJT/EIKJT
Manufacturer
STMicroelectronics
Specifications of DEMOTS4956J
Amplifier Type
Class AB
Output Type
1-Channel (Mono) with Mono and Stereo Headphones
Max Output Power X Channels @ Load
1W x 1 @ 8 Ohm; 43mW x 2 @ 32 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
TS4956
Description/function
Audio Amplifiers
Operating Supply Voltage
2.7 V to 5.5 V
Product
Audio Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
TS4956
Other names
497-6381
DEMOTS4956J
DEMOTS4956J
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
TS4956
4.3.3
The efficiency is the ratio between the output power and the power supply.
The maximum theoretical value is reached when V
In modes 3 and 4, the TS4956 has two active output power amplifiers. Each amplifier
produces heat due to its power dissipation. Therefore the maximum die temperature is the
sum of each amplifier’s maximum power dissipation. It is calculated as follows.
In most cases, P
BTL output configuration (modes 1, 2, 7)
The average current delivered by the supply voltage is:
Figure 126. Current delivered by supply voltage in a BTL output configuration
The power delivered by the supply voltage is:
Then, the power dissipation by each amplifier is:
P
P
Total P
diss 1
diss 2
= power dissipation due to the first power amplifier.
= power dissipation due to the second power amplifier.
diss
diss 1
= P
= P
diss 1
Icc
diss 2
AVG
TotalP
+ P
, giving:
P
diss
=
diss 2
P
1
-- -
π
diss
∫
supply
TotalP
=
π
0
η
V
---------------- -
2 2V
---------------------- P
(W)
=
PEAK
π R
=
R
4 2V
---------------------- P
L
=
η
π
-- -
8
diss
π R
CC
=
L
V
=
sin
CC
------------------ -
P
CC
39.25%
L
=
t ( )
P
supply
I
CC
out
2P
out
t d
PEAK
AVG
diss1
out
–
=
=
P
(
2V
-------------------- - A
W
–
out
πV
-------------------- -
2P
= V
πR
)
4V
PEAK
(
W
PEAK
out
L
CC
CC
)
(
( )
W
/2, so
)
Application information
42/55