TS489IQT STMicroelectronics, TS489IQT Datasheet - Page 22

• Manufacturer Part Number: TS489IQT
• Description: IC AMP AUDIO PWR .13W STER 8DFN
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS489IQT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 130mW x 2 @ 16 Ohm
• Voltage - Supply: 2.2 V ~ 5.5 V
• Features: Depop, Short-Circuit Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• For Use With: 497-6363 - BOARD DEMO FOR TS489
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5991-2

Application information
4
4.1
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Application information
Power dissipation and efficiency
Hypotheses:
■
■
Regarding the load we have:
and
and
The average current delivered by the power supply voltage is:
Figure 78. Current delivered by power supply voltage in single-ended configuration
The power delivered by power supply voltage is:
So, the power dissipation by each power 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
Vpeak/R
Icc
Icc (t)
AVG
L
0
I
CC
AVG
P
diss
=
T/2
------
2π
P
1
P
V
diss
=
supply
OUT
∫
0
π
P
------------------ - P
I
OUT
V
---------------- -
π R
OUT
=
2V
PEAK
R
∂P
∂
=
P
P
CC
L
=
CC
L
supply
V
diss
OUT
=
=
T
V
).
PEAK
sin
V
---------------- - A
V
-------------- A
CC
2R
R
2
PEAK
OUT
OUT
t ( )
=
I
–
L
CC
sin
L
P
0
t d
( )
OUT
AVG
–
( )
out
ωt V
=
P
3T/2
( )
(
(
OUT
W
and I
V
---------------- - A
W
πR
PEAK
)
)
(
L
W
out
)
( )
).
2T
Time
TS488-TS489