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參數(shù)資料
| 型號： | AS1706-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.6W Audio Power Amplifiers; Package Type: MSOP-8; Shutdown: Active Low |
| 中文描述： | 1.6 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 433K |
| 代理商： | AS1706-T |
11 - 18
AS1701, AS1706
Datasheet - Application Information
9 Application Information
BTL Amplifier
The AS1701/AS1706 are designed to drive loads differentially in a bridge-tied load (BTL) configuration.
Figure 30. Bridge-Tied Load Configuration
Driving the load differentially doubles the output voltage (illustrated in
Figure30
) compared to a single-ended amplifier under simlar conditions.
Thus, the differential gain of the device is twice the closed-loop gain of the input amplifier. The effective gain is calculated by:
Substituting 2 x V
OUT(P-P)
into (EQ 3) and (EQ 4) yields four times the output power due to doubling of the output voltage.
Since the differential outputs are biased at md-supply, there is no net DC voltage across the load, elimnating the need for the large, expensive,
performance degrading DC-blocking capacitors required by single-ended amplifiers.
Power Dissipation and Heat Sinking
Normally, the devices dissipate a significant amount of power. The maximumpower dissipation is given in
Table 2
as Continuous Power Dissipa-
tion, or it can be calculated by:
where T
J(MAX)
is +150°C, T
AMB
(see
Table 2
) is the ambient temperature, and
Θ
JA
is the reciprocal of the derating factor in °C/W.
The increased power delivered by a BTL configuration normally results in increased internal power dissipation versus a single-ended configura-
tion. The maximuminternal power dissipation for a given V
DD
and load is calculated by:
If the internal power dissipation exceeds the maximumallowed for a given package, power dissipation can be reduced by increasing the ground
plane heat-sinking capabilities and increasing the size of the traces to the device
(see Layout and Grounding Considerations on page 14)
. Addi-
tionally, reducing V
DD
, increasing load impedance, and decreasing ambient temperature can reduce device power dissipation.
+1
-1
V
OUT(P-P)
V
OUT(P-P)
2 x V
OUT(P-P)
A
VD
= 2 x
R
IN
(EQ 2)
R
F
V
RMS
=
2 2
(EQ 3)
V
OUT(P-P)
P
OUT
=
R
L
(EQ 4)
V
RMS
2
P
DISSPKF(MAX)
=
Θ
JA
(EQ 5)
T
J(MAX)
-T
A
P
DISSPKF(MAX)
=
π
2
R
L
(EQ 6)
2V
DD
2
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| AS1704 | 1.6W Single-Channel Audio Power Amplifiers |
| AS1702 | 1.6W Single-Channel Audio Power Amplifiers |
| AS1703 | 1.6W Single-Channel Audio Power Amplifiers |
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