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PDF TA2020-020 Data sheet ( Hoja de datos )
| Número de pieza | TA2020-020 | |
| Descripción | Stereo 20W Class-T Digital Audio Amplifier using Digital Power Processing | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TA2020-020 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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BT E C H N I C A L I N F O R M A T I O N
Stereo 20W (4Ω) Class-T Digital Audio Amplifier using
Digital Power ProcessingTM Technology
TA2020-020
September, 2000
General Description
The TA2020-020 is a 20W continuous average two-channel Class-T Digital Audio Power
Amplifier IC using Tripath’s proprietary Digital Power ProcessingTM technology. Class-T
amplifiers offer both the audio fidelity of Class-AB and the power efficiency of Class-D
amplifiers.
Applications
¾DVD Players
¾Mini/Micro Component Systems
¾Automotive Audio
¾Computer / PC Multimedia
¾Cable Set-Top Products
¾Televisions
¾Battery Powered Systems
Benefits
¾Fully integrated solution with FETs
¾ Easier to design-in than Class-D
¾ Reduced system cost with no heat sink
¾Dramatically improves efficiency versus
Class-AB
¾Signal fidelity equal to high quality linear
amplifiers
¾High dynamic range compatible with
digital media such as CD, DVD, and
internet audio
Typical Performance
Features
¾Class-T architecture
¾Single Supply Operation
¾“Audiophile” Quality Sound
¾0.03% THD+N @ 10W 4Ω
¾0.1% THD+N @12W 4Ω
¾0.18% IHF-IM @ 1W 4Ω
¾High Power
¾13W @ 8Ω, 10% THD+N
¾23W @ 4Ω, 10% THD+N
¾38W EIAJ* VDD=14.4V @ 4Ω
*saturated square wave output
¾High Efficiency
¾88% @ 12W 8Ω
¾81% @ 20W 4Ω
¾Dynamic Range = 103 dB
¾Up to 2X25Wrms @ 4Ω, VDD=14.6V
¾Mute and Sleep inputs
¾Turn-on & turn-off pop suppression
¾Over-current protection
¾Over-temperature protection
¾Bridged outputs
¾32-pin SSIP package
THD+N versus Output Power
10
5
VDD = 13.5V
Av = 12
f = 1kHz
2 BW = 22Hz - 22kHz
1
0.5
0.2
0.1
RL= 8Ω
RL= 4Ω
0.05
0.02
0.01
500m
1
1 of 13
2 3 4 5 6 7 8 9 10
Output Power (W)
20
TA2020-020, Rev. 4.0, 09.00
1 page  
TECHNICAL INFORMATION
B
Application/Test Circuit
TA2020-020
1 NC
CI
2.2uF
+
RF
20KΩ
RI
20KΩ
VP1 9
IN1 10
CA
0.1uF
(Pin 7)
BIASCAP
5V
14
11
5V
MUTE
Processing
&
Modulation
CI
2.2uF
+
RF
20KΩ
RI
20KΩ
VP2
IN2
(Pin 3)
RREF
8.25KΩ, 1%
12
13
4
REF
Processing
&
Modulation
+12V
CD
0.1uF
1meg Ω
0.1uF
To Pin 30
CS
0.1uF
CS
0.1uF
32 DCAP1
31 DCAP2
17 SLEEP
5 NC
5V
2 V5D
3 AGND1
8 V5A
7 AGND2
15 NC
16 AGND3
VDD1
26 OUTP1
Lo
10uH, 3A
PGND1
VDD1
DO
(Pin 28)
(Pin 28)
24
PGND1
18
6
VDD2
OUTM1
DO
(Pin 28)
10uLHo, 3A
FAULT
OVERLOADB
21 OUTP2
Lo
10uH, 3A
PGND2
VDD2
DO
(Pin 19)
(Pin 19)
23 OUTM2
PGND2
DO
(Pin 19)
Lo
10uH, 3A
*Co
0.47uF
CZ
0.47uF
CCM
0.1uF
*Co RZ
0.47uF 10Ω, 1/2W
*Co
0.47uF
CZ
0.47uF
*Co
0.47uF
RZ
10Ω, 1/2W
CCM
0.1uF
CPUMP 29
VDDA 27
DGND 20
5VGEN 30
VDD1 25
PGND1 28
VDD2 22
PGND2 19
+ CP
1uF
CS
0.1uF
CS
0.1uF
To Pin 2,8
CSW
0.1uF
+ CSW
180uF, 16V
CSW
0.1uF
+ CSW
180uF, 16V
VDD (+13.5V)
4Ω oRrL*8Ω
RL
4Ω or *8Ω
Note: Analog and Digital/Power Grounds must
be connected locally at the TA2020-020
Analog Ground
Digital/Power Ground
All Diodes Motorola MBRS130T3
* Use Co = 0.22µF for 8 Ohm loads
TA2020-020, Rev. 4.0, 09.00
5 of 13
5 Page 
TECHNICAL INFORMATION
B
The θJA of the TA2020-020 in free air is 15°C/W. The θJC of the TA2020-020 is 3.5°C/W, so a heat
sink of 4.5°C/W is required for this example. In actual applications, other factors such as the
average PDISS with a music source (as opposed to a continuous sine wave) and regulatory agency
testing requirements will determine the size of the heat sink required.
Performance Measurements of the TA2020-020
The TA2020-020 operates by generating a high frequency switching signal based on the audio
input. This signal is sent through a low-pass filter (external to the Tripath amplifier) that recovers an
amplified version of the audio input. The frequency of the switching pattern is spread spectrum in
nature and typically varies between 100kHz and 1MHz, which is well above the 20Hz – 20kHz
audio band. The pattern itself does not alter or distort the audio input signal, but it does introduce
some inaudible components.
The measurements of certain performance parameters, particularly noise related specifications
such as THD+N, are significantly affected by the design of the low-pass filter used on the output as
well as the bandwidth setting of the measurement instrument used. Unless the filter has a very
sharp roll-off just beyond the audio band or the bandwidth of the measurement instrument is limited,
some of the inaudible noise components introduced by the TA2020-020 amplifier switching pattern
will degrade the measurement.
One feature of the TA2020-020 is that it does not require large multi-pole filters to achieve excellent
performance in listening tests, usually a more critical factor than performance measurements.
Though using a multi-pole filter may remove high-frequency noise and improve THD+N type
measurements (when they are made with wide-bandwidth measuring equipment), these same
filters degrade frequency response. The TA2020-020 Evaluation Board uses the Application/Test
Circuit of this data sheet, which has a simple two-pole output filter and excellent performance in
listening tests. Measurements in this data sheet were taken using this same circuit with a limited
bandwidth setting in the measurement instrument.
TA2020-020, Rev. 4.0, 09.00
11 of 13
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| PDF Descargar | [ Datasheet TA2020-020.PDF ] | |
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