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參數(shù)資料
| 型號： | AA4002G-E1 |
| 廠商： | BCD Semiconductor Manufacturing Limited |
| 英文描述： | STEREO 2W AUDIO POWER AMPLIFIER |
| 中文描述： | 2W的立體聲音頻功率放大器 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 439K |
| 代理商： | AA4002G-E1 |
STEREO 2W AUDIO POWER AMPLIFIER
AA4002
Data Sheet
13
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Application Information
SE/BTL Mode, HP_SENSE Pin
The AA4002 can be operated in 2 types of output
configurations, SE (Single-Ended) mode and BTL
(Bridged-Tied-Load)
mode,
HP_SENSE pin (pin 21) logic level. (Here is the
discussion about left channel only, it also applies to
right channel.)
determined
by
If applying high level to pin 21, the output of OP2 unit
is in high impedance, the chip operates in SE mode.
There is no current loop between OUT+ and OUT-,
also no power consumption.
When HP_SENSE pin is held low, OP2 unit is turned
on, the chip operates in BTL mode. AC signal at OUT+
is -180
o
phase shift of OUT-. OP2 has fixed unity gain
internally, so DC components (Bias voltage, approx
1/2 V
DD
) between OUT+, OUT- is canceled. There is
no need for DC block capacitors in system.
In BTL mode, voltage between speaker load is about 2
times that in SE mode, so there is 4 times output power
compared to SE mode with same load.
In SE mode, output audio signal rides on Bias voltage
at OUT-, so it is necessary to use capacitor to block
DC bias and couple AC signal. See Figure 28 typical
application circuit.
It is recommended to connect HP_SENSE to the
control pin of headphone jack, illustrated in Figure 28.
When headphone plug is not inserted, the voltage of
HP_SENSE pin is determined by voltage divider
formed by R
PU
, R
L
. For given resistors value in Figure
28, R
PU
=100k, R
L
=1.5k, DC voltage at HP_SENSE is
about 75mV. AC signal equals output amplitude of
OUT- through C
OUT
, so signal at HP_SENSE node is
75mV DC plus AC signal. The maximum Peak-to-
Peak voltage at OUT- is not greater than V
DD
=5.0V
supply voltage, so the positive maximum voltage of
HP_SENSE
node
is
2.5V+75mV=2.575V, which can not reach HP_SENSE
input high level minimum value (4.0V), there is no risk
of mode switching between SE and BTL.
not
greater
than
HP_SENSE pin can also be connected to MCU I/O
port, it is necessary to note that AA4002 still can drive
headphone even in BTL mode because OUT- is always
active whatever SE or BTL mode.
Internal/External Gain, Gain SELECT Pin
The AA4002 provides 2 selectable feedback loops,
Internal and External determined by SELECT pin (pin
3) logic level. Applying low level to SELECT pin, the
AA4002 switches to internal feedback loop, OP1
works as unity gain. If applying high level to SELECT
pin, external components are used as feedback loop,
and the gain is expressed by formula below.
..............................(1)
Here ZC
BS
is the impedance of bass boost capacitor,
ZC
BS
=1/2
π
*f*C
BS
. So A
VFB
approaches 2 points,
A
VFBLF
at low frequency, A
VFBHF
at high frequency,
expressed by formula 2 and 3.
.............................................(2)
........................................................(3)
Bass Boost
From above discussion, the AA4002 can improve gain
of audio signal at low frequency, which is hard to
listening for human ears relative to middle band (2kHz
to 3kHz). The boost corner frequency is determined by
formula 4.
Figure 22. BTL Configuration in Left Channel
I
F
BS
BS
VFB
A
R
R
ZC
R
+
=
)
//
(
I
F
BS
VDLF
A
R
R
R
+
=
I
F
VFBHF
A
R
R
=
10k
20k
20k
10k
Left Out-
Left Out+
+
_
+
_
17
15
Bias
+
C
OUT
220
μ
F
R
L
1.5k
OP1
OP2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AA4002GTR-E1 | 制造商:BCDSEMI 制造商全稱:BCD Semiconductor Manufacturing Limited 功能描述:STEREO 2W AUDIO POWER AMPLIFIER |
| AA4003 | 制造商:BCDSEMI 制造商全稱:BCD Semiconductor Manufacturing Limited 功能描述:2W STEREO AUDIO POWER AMPLIFIER WITH SHUTDOWN |
| AA-400-32-MK3-SUPHTR-1 | 制造商:TE Connectivity 功能描述:APPLICATION EQUIPMENT GENERAL PURPOSE 制造商:RAYCHEM / TYCO ELEC 功能描述:AA-400-32-MK3-SUPHTR-120V 2-1194615-4,582602-000 |
| AA-400-32-MK3-SUPHTR-120V | 制造商:TE Connectivity 功能描述:AA-400-32-MK3-SUPHTR-120V |
| AA4003G-E1 | 制造商:BCDSEMI 制造商全稱:BCD Semiconductor Manufacturing Limited 功能描述:2W STEREO AUDIO POWER AMPLIFIER WITH SHUTDOWN |
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