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TS4855 데이터시트(PDF) 20 Page - STMicroelectronics

부품명 TS4855
상세설명  LOUDSPEAKER & HEADSET DRIVER WITH VOLUME CONTROL
PDF  27 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4855 데이터시트(HTML) 20 Page - STMicroelectronics

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TS4855
Application Information
20/27
6
APPLICATION INFORMATION
6.1 BTL Configuration Principle
The
TS4855
integrates
3
monolithic
power
amplifiers having BTL output. BTL (Bridge Tied
Load) means that each end of the load is
connected to two single-ended output amplifiers.
Thus, we have:
Single ended output 1 = Vout1 = Vout (V)
Single ended output 2 = Vout2 = -Vout (V)
and
Vout1 - Vout2 = 2Vout (V)
The output power is:
For the same power supply voltage, the output
power in BTL configuration is 4 times higher than
the output power in single-ended configuration.
6.2 Power dissipation and efficiency
Hypotheses:
•
Voltage and current in the load are sinusoidal
(Vout and Iout).
•
Supply voltage is a pure DC source (Vcc).
Regarding the load we have:
and
and
Therefore, the average current delivered by the
supply voltage is:
The power delivered by the supply voltage is:
Psupply = Vcc IccAVG (W)
Then, the power dissipated by each amplifier is
Pdiss = Psupply - Pout (W)
and the maximum value is obtained when:
and its value is:
Note: This maximum value is only depending on
power supply voltage and load values.
The efficiency is the ratio between the output
power and the power supply
The maximum theoretical value is reached when
Vpeak = Vcc, so
The TS4855 has 3 independent power amplifiers
and each amplifier produces heat due to its power
dissipation.
Therefore,
the
maximum
die
temperature is the sum of the each amplifier’s
maximum power dissipation. It is calculated as
follows:
Pdiss speaker = Power dissipation due to the
speaker power amplifier.
Pdiss head = Power
dissipation
due
to
each
headphone’s power amplifier.
Total Pdiss =Pdiss speaker +Pdiss head1 +Pdiss head2 (W)
In most cases, Pdiss head1 = Pdiss head 2, giving:
Total Pdiss = Pdiss speaker +2Pdiss head (W)
)
W
(
R
)
Vout
2
(
Pout
L
2
RMS
=
VOUT = VPEAK sinωt (V)
IOUT =
VOUT
R L
----------------- (A)
POUT =
VPEAK
2
2RL
---------------------- (W)
ICC
AVG
= 2
VPEAK
πRL
-------------------- (A)
)
W
(
P
P
R
V
2
2
P
OUT
OUT
L
CC
diss
−
π
=
∂Pdiss
∂POUT
---------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
2
π
=
η =
POUT
Psup pl y
------------------------ = π
VPEAK
4VCC
-----------------------
π
4
----- = 78.5%
[]
)
W
(
P
2
P
R
P
2
R
P
V
2
2
TotalP
HEAD
OUT
SPEAKER
OUT
HEAD
L
HEAD
OUT
SPEAKER
L
SPEAKER
OUT
CC
diss
+
−
+
π
=



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