DEMOTS4956J STMicroelectronics, DEMOTS4956J Datasheet - Page 42

• 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

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