TS4974_07 STMICROELECTRONICS [STMicroelectronics], TS4974_07 Datasheet - Page 17

• Manufacturer Part Number: TS4974_07
• Description: 1W differential audio power amplifier with up/down digital volume control pins
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

TS4974
4.3
Assumptions:
Power dissipation and efficiency
●
●
The output voltage is:
and
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
Load voltage and current are sinusoidal (V
Supply voltage is a pure DC source (V
P
P
supply
diss
= P
= V
supply
CC
I
CC AVG
- P
out
(W)
(W)
P
diss
I
CC
V
P
=
out
out
AVG = 2
I
out
2 2V
---------------------- P
= V peak sinωt (V)
=
π R
=
CC
V
-------------------- - (W)
V
------------ - (A)
peak
2R
R
CC
)
L
out
out
L
V
---------------- - (A)
L
πR
2
peak
and I
L
out
–
P
out
out
)
Application information
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