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參數(shù)資料
| 型號： | TA3020 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Stereo 300W (4з) Class-T Digital Audio Amplifier Driver using Digital Power ProcessingTM Technology |
| 中文描述： | 立體聲300W的（4з）類- T數(shù)字音頻放大器驅(qū)動器使用數(shù)字電源ProcessingTM技術(shù) |
| 文件頁數(shù)： | 15/29頁 |
| 文件大?。?/td> | 284K |
| 代理商： | TA3020 |
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T E C H N I C A L I N F O R M A T I O N
TA3020, Rev 2.1, 01.01
15
Application Information
Figure 1 is a simplified diagram of one channel (Channel 1) of a TA3020 amplifier to assist in
understanding its operation.
Figure 1: Simplified TA3020 Amplifier
TA3020 Basic Amplifier Operation
The audio input signal is fed to the processor internal to the TA3020, where a switching pattern is
generated. The average idle (no input) switching frequency is approximately 700kHz. With an input
signal, the pattern is spread spectrum and varies between approximately 200kHz and 1.5MHz
depending on input signal level and frequency. Complementary copies of the switching pattern are
level-shifted by the MOSFET drivers and output from the TA3020 where they drive the gates (HO1
and LO1) of external power MOSFETs that are connected as a half bridge. The output of the half
bridge is a power-amplified version of the switching pattern that switches between VPP and VNN.
This signal is then low-pass filtered to obtain an amplified reproduction of the audio input signal.
The processor portion of the TA3020 is operated from a 5-volt supply. In the generation of the
switching patterns for the output MOSFETs, the processor inserts a “break-before-make” dead time
between the turn-off of one transistor and the turn-on of the other in order to minimize shoot-through
currents in the MOSFETs. The dead time can be programmed by setting the break-before-make
control bits, BBM1 and BBM0. Feedback information from the output of the half-bridge is supplied to
HMUTE
OAOUT1
INV1
C
I
26
25
15
+
Analog Ground
Power Ground
V5
-
+
AGND
MUTE
24
5V
V5
32
REF
R
REF
39
VNN
*R
VPP1
VPP
VNN
29
VPPSENSE
30
VNNSENSE
C
SW
VN10
1
VNN
Offset Trim
Circuit
*R
VNN1
*R
VPP1
V5
V5
*R
VNN2
Processing
&
Modulation
C
0.1uF
C
BAUX
R
B
VN10
D
B
VN10
FBKOUT1
FBKGND1
13
14
+
R
L
C
HBR
LO1
48
47
42
R
G
Q
O
HO1
45
46
R
G
Q
O
LO1COM
OCS1LP
HO1COM
OCS1LN
41
VBOOT1
40
OCS1HP
43
OCS1HN
44
R
S
R
S
C
S
VPP
VNN
R
OFA
V5
R
OFB
R
OFB
C
OF
R
F
R
I
VNN
R
FBB
R
FBB
R
FBC
R
FBC
C
FB
C
OCR
R
OCR
OCR1
33,37
C
S
R
FBA
R
FBA
V5
OUTPUT
FILTER
BIASCAP
C
A
19
2.5V
C
S
27,35
28,34
V5
AGND
5V
OVER
CURRENT
DETECTION
OVER
CURRENT
DETECTION
OVER/
UNDER
VOLTAGE
DETECTION
23
BBM1
22
BBM0
F. BEAD
VN10
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