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參數(shù)資料
| 型號(hào)： | TSDC05IJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | LEAD FREE, FCP-9 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 714K |
| 代理商： | TSDC05IJT |
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Application information
TS4990
20/32
Therefore, 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 dependent 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:
4.5
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4990: a power supply bypass
capacitor Cs and a bias voltage bypass capacitor Cb.
Cs has particular influence on the THD+N in the high frequency region (above 7 kHz) and
an indirect influence on power supply disturbances. With a value for Cs of 1 F, you can
expect THD+N levels similar to those shown in the datasheet.
In the high frequency region, if Cs is lower than 1 F, it increases THD+N and disturbances
on the power supply rail are less filtered.
On the other hand, if Cs is higher than 1 F, those disturbances on the power supply rail are
more filtered.
Cb has an influence on THD+N at lower frequencies, but its function is critical to the final
result of PSRR (with input grounded and in the lower frequency region).
If Cb is lower than 1 F, THD+N increases at lower frequencies and PSRR worsens.
If Cb is higher than 1 F, the benefit on THD+N at lower frequencies is small, but the benefit
to PSRR is substantial.
Note that Cin has a non-negligible effect on PSRR at lower frequencies. The lower the value
of Cin, the higher the PSRR.
P
diss
22V
CC
π R
L
---------------------- P
out Pout
–
=
δP
diss
δP
out
------------------ = 0
P
diss
max
2V
CC
2
π
2
R
L
---------------
(W)
=
η=
P
out
P
supply
------------------- =
πV
PEAK
4V
CC
-----------------------
π
4
----- = 78.5%
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