TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 26

• Manufacturer Part Number: TS4975EIJT
• Description: IC AMP AUDIO .04W AB 12FLIPCHIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4975EIJT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 40mW x 2 @ 16 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, I²C, Standby, Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 12-FlipChip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5199-2; TS4975EIJT

Application Information
4.3
26/36
Power dissipation and efficiency
Hypotheses:
Regarding the load we have:
Single-ended configuration:
The average current delivered by the supply voltage is:
Figure 60. Current delivered by supply voltage in single-ended model
The power delivered by supply voltage is:
So, the power dissipation by each amplifier is
and the maximum value is obtained when:
Voltage and current in the load are sinusoidal (V
Supply voltage is a pure DC source (V
and
and
Icc
AVG
P
diss
=
P
P
------
2
supply
1
V
diss
=
out
∫
0
P
V
-----------------
------------------ - P
out
I
out
PEAK
2V
R
=
=
=
L
R
=
P
V
CC
P
P
=
V
L
supply
PEAK
V
-----------------
diss
out
sin
C C
V
---------- -
2R
2
PEAK
R
out
I
CC
L
CC
t
out
L
=
sin
–
t d
P
).
AVG
0
–
out
=
P
A
t
out
A
V
-----------------
V
PEAK
W
R
out
W
L
W
and I
A
out
).
TS4975