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參數(shù)資料
| 型號(hào)： | TS4872IJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封裝： | FCP-8 |
| 文件頁數(shù)： | 15/29頁 |
| 文件大小： | 1012K |
| 代理商： | TS4872IJT |
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TS4872
22/29
NO
T
F
O
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NEW
D
E
SIGN
Then, the average current delivered by the supply
voltage is:
Then, the power dissipated by the amplifier is
Pdiss = Psupply - Pout (W)
and the maximum value is obtained when:
and its value is:
Remark : 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
■ Decoupling of the circuit
Two capacitors are needed to bypass properly the
TS4872. A power supply bypass capacitor Cs and
a bias voltage bypass capacitor Cb.
Cs has especially an influence on the THD+N in
high frequency (above 7kHz) and indirectly on the
power supply disturbances.
With 100F, you can expect similar THD+N
performances like shown in the datasheet.
If Cs is lower than 100F, in high frequency
increases, THD+N and disturbances on the power
supply rail are less filtered.
To the contrary, if Cs is higher than 100F, those
disturbances on the power supply rail are more
filtered.
Cb has an influence on THD+N in lower frequency,
but its function is critical on the final result of PSRR
with input grounded in lower frequency.
If Cb is lower than 1F, THD+N increase in lower
frequency (see THD+N vs frequency curves) and
the PSRR worsens up
If Cb is higher than 1F, the benefit on THD+N in
lower frequency is small but the benefit on PSRR
is substantial (see PSRR vs. Cb curve : fig.12)
Note that Cin has a non-negligible effect on PSRR
in lower frequency. Lower is its value, higher is the
PSRR (see fig. 13).
■ Pop and Click performance
Pop and Click performance is intimately linked with
the size of the input capacitor Cin and the bias
voltage bypass capacitor Cb.
Size of Cin is due to the lower cut off frequency
and PSRR value request and size of Cb is due to
THD+N and PSRR request always in lower
frequency.
Moreover, Cb determines the speed at which the
amplifier turns ON. The slower the speed is , the
softer turns ON noise.
The charge time of Cb is directly proportional to
the internal generator resistance 50k
.
Then, the charging time constant for Cb is
τb = 50kxCb (s)
As Cb is directly connected to the non-inverting
input (pin 3 & 7) and if we want to minimize, in
amplitude and duration, the output spike on Vout1
(pin 8), Cin must be charged faster than Cb. The
charge time constant of Cin is
τin = (Rin+Rfeed)xCin (s)
Thus we have the relation
τin << τb (s)
The respect of this relation permits to minimize the
pop and click noise.
Remark : Minimize Cin and Cb has a benefit on
pop and click phenomena but also on cost and
size of the application.
ICC
AVG
= 2
VPEAK
πRL
-------------------- (A)
Pdi ss =
22 Vcc
π RL
---------------------- POUT
POUT (W)
–
Pdiss
POUT
---------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
π
=
η =
POUT
Psup pl y
------------------------ =
πVPEAK
4VCC
-----------------------
π
4
----- = 78.5%
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