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參數(shù)資料
| 型號(hào)： | TK2019 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | STEREO 20W (4OHM) CLASS-T DIGITAL AUDIO AMPLIFIER |
| 中文描述： | 立體聲20瓦（4Ω）類- T的數(shù)字音頻放大器 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大小： | 414K |
| 代理商： | TK2019 |
Tripath Technology, Inc. - Technical Information
12
TK2019 – MC/2.1/10-03
Some components are not sensitive to location but are very sensitive to layout and trace routing.
-
To maximize the damping factor and reduce distortion and noise, the modulator feedback
connections should be routed directly to the pins of the output inductors, L
O
.
-
The modulator feedback resistors should all be grounded together through a direct
connection to pin 20 on the TC2001.
TK2019 Grounding
Proper grounding techniques are required to maximize TK2019 functionality and performance.
Parametric parameters such as THD+N, noise floor and cross talk can be adversely affected if proper
grounding techniques are not implemented on the PCB layout. The following discussion highlights
some recommendations about grounding both with respect to the TK2019 as well as general “audio
system” design rules.
The TK2019 is divided into two sections: the input section, and the output (high power) section. On
the TK2019 evaluation board, the ground is also divided into distinct sections, one for the input and
one for the output. To minimize ground loops and keep the audio noise floor as low as possible, the
input and output ground must be only connected at a single point. Depending on the system design,
the single point connection may be in the form of a ferrite bead or a PCB trace.
Modulator Feedback Design
The modulator converts the signal from the input stage to the high-voltage output signal. The
optimum gain of the modulator is determined from the maximum allowable feedback level for the
modulator and maximum supply voltage for the power stage. Depending on the maximum supply
voltage, the feedback ratio will need to be adjusted to maximize performance. The values of RFBB
and RFBC (see explanation below) define the gain of the modulator. Once these values are chosen,
based on the maximum supply voltage, the gain of the modulator will be fixed even with as the supply
voltage fluctuates due to current draw.
For the best signal-to-noise ratio and lowest distortion, the maximum modulator feedback voltage
should be approximately 4Vpp. This will keep the gain of the modulator as low as possible and still
allow headroom so that the feedback signal does not clip the modulator feedback stage.
The modulator feedback resistors are:
R
FBB
= User specified; typically 1k
R
V
R
FBB
FBB
CC
FBC
R
4V
=
Modulator Feedback Bias Resistors
R
BIAS1
and R
BIAS2
set the bias of node 1 to VDD/2. The equivalent resistance of R
BIAS2
, R
FBC1
, R
FBB1
,
R
FBC2
, and R
FBB2
should be the same as R
BIAS1
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK20-19,1/9,5-PVDF | 制造商:HellermannTyton 功能描述:HEATSHRINK, 2:1, 19.1MM, 1.2M 制造商:HELLERMANN TYTON 功能描述:HEATSHRINK, 2:1, 19.1MM, 1.2M; I.D. Supplied - Metric:19.1mm; I.D. Supplied - Imperial:0.751"; I.D. Recovered Max - Metric:9.5mm; I.D. Recovered Max - Imperial:0.374"; Shrink Ratio:2:1; Shrink Tubing / Boot Material:PVDF ;RoHS Compliant: Yes |
| TK20-191/95-PVDF | 制造商:HellermannTyton 功能描述:HEATSHRINK 2:1 19.1MM 1.2M |
| TK20-2,4/1,2-PVDF-CL | 制造商:HellermannTyton 功能描述:HEATSHRINK, 2:1, 2.4MM, 1.2M 制造商:HellermannTyton 功能描述:HEATSHRINK, 2:1, 2.4MM, 1.2M, I.D. Supplied - Metric:2.4mm, I.D. Supplied - Impe |
| TK20-24/12-PVDF-CL | 制造商:HellermannTyton 功能描述:HEATSHRINK 2:1 2.4MM 1.2M |
| TK20-25,4/12,7-PVDF | 制造商:HellermannTyton 功能描述:HEATSHRINK, 2:1, 25.4MM, 1.2M 制造商:HELLERMANN TYTON 功能描述:HEATSHRINK, 2:1, 25.4MM, 1.2M; I.D. Supplied - Metric:25.4mm; I.D. Supplied - Imperial:0.999"; I.D. Recovered Max - Metric:12.7mm; I.D. Recovered Max - Imperial:0.499"; Shrink Ratio:2:1; Shrink Tubing / Boot Material:PVDF ;RoHS Compliant: Yes |
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