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PDF TA0102A Data sheet ( Hoja de datos )
| Número de pieza | TA0102A | |
| Descripción | DIGITAL AUDIO AMPLIFIER DRIVER | |
| Fabricantes | ETC | |
| Logotipo |  |
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Tripath Technology, Inc. - Technical Information
TA 0 1 0 2 A
STEREO 150W (4Ω) CLASS-T DIGITAL AUDIO AMPLIFIER
DRIVER USING DIGITAL POWER PROCESSING (DPPTM)
TECHNOLOGY
Technical Information
Revision 3.1 – June 2000
GENERAL DESCRIPTION
The TA0102A is a 150W continuous average (4Ω), two channel Amplifier Driver
Module which uses Tripath’s proprietary Digital Power Processing (DPPTM)
technology. Class-T amplifiers offer both the audio fidelity of Class-AB and
the power efficiency of Class-D amplifiers.
Applications
Audio/Video
Amplifiers/Receivers
Pro-audio Amplifiers
Automobile Power Amplifiers
Subwoofer Amplifiers
Benefits
Reduced system cost with smaller/less
expensive power supply and heat sink
Signal fidelity equal to high quality Class-
AB amplifiers
High dynamic range compatible with digital
media such as CD and DVD
Features
Class-T architecture
Proprietary Digital Power Processing
technology
Supports wide range of output power levels
Typical Performance
10
20Hz - 22kHz BW
f = 1kHz
5
BBM = 25nS
Vs = +/-45V
Av = 14.8
ST STP19NB20 MOSFET
2
1
0.5
THD+N versus Output Power
0.2
RL = 8Ω
0.1
0.05 RL = 4Ω
0.02
0.01
1
2
1
5 10
20
Output Power (W)
50 100 200
“Audiophile” Quality Sound
0.05% THD+N @ 20W, 8Ω
0.03% IHF-IM @ 30W, 8Ω
80W @ 8Ω, 0.1% THD+N, VS = +/-45V
150W @ 4Ω, 0.1% THD+N, VS = +/-45V
High Power
100W @ 8Ω, 1% THD+N, VS = +/-45V
170W @ 4Ω, 1% THD+N, VS = +/-45V
High Efficiency
90% @ 85W @ 8Ω, VS = +/-33.75V
88% @ 155W @ 4Ω, VS = +/-33.75V
Dynamic Range = 108 dB
Requires only N-Channel MOSFET output
transistors
High power supply rejection ratio
Mute input
Outputs short circuit protected
Over- and under-voltage protection
Bridgeable, single-ended outputs
38-pin quad package
Supports 100kHz BW of Super Audio CD and
DVD-Audio (refer to Application Note for specifics)
TA102A –Rev.3.1/06.01
1 page  
Tripath Technology, Inc. - Technical Information
TEST/APPLICATION CIRCUIT
V5
10KΩ
V5
10KΩ
CIN
RIN
IN1 6
1MΩ
1MΩ
0.1 uF
MUTE
4
ROCR1
ROCR2
OCR1
OCR2
BBM0
11
10
7
BBM1
8
CIN
RIN
IN2 5
1MΩ
1MΩ
0.1 uF
NC
NC
NC
V5
0.1 uF
36
37
38
3
TA0102A
Processing
&
Modulation
Processing
&
Modulation
AGnd
1
PGnd
28
18 FDBKN1
16 OCS1H+
15 OCS1H-
RS
22 HO1
21 HO1COM
RG
20 LO1
13 OCS1L+
RG
MD
MD
CBY
CBY
17 LO1COM
14 OCS1L-
RS
9 GNDKELVIN1
2 OVERLOADB
35 HMUTE
29 FDBKN2
34 OCS2H+
33 OCS2H-
25 HO2
26 HO2COM
RG
27 LO2
32 OCS2L+
RG
30 LO2COM
31 OCS2L-
12 GNDKELVIN2
23 VSPOS
24 VSNEG
19 VN12
RS
MD
CBY
MD
CBY
RS
.1uF
VSPOS
100uF
LF
CF
RD RL
CD
.1uF
VSNEG
100uF
.1uF
VSPOS
100uF
LF
CF
RD RL
CD
.1uF
VSNEG
100uF
NC - Not Connected (Must Be Left Floating)
Note - Heavy Lines Indicate High-Current Paths
Figure 2
5 TA0102A, Rev. 3.1/06.01
5 Page 
Tripath Technology, Inc. - Technical Information
Application Information
Amplifier Gain and Input Resistor Selection
The value of the input resistor, RIN, is based on the required voltage gain, AV, of the amplifier
according to:
AV = 387 x103/(RIN + 5000)
where RIN = Input resistor value in ohms.
Input Capacitor Selection
CIN can be calculated once a value for RIN has been determined. CIN and RIN determine the input
low-frequency pole. Typically this pole is set at 10Hz. CIN is calculated according to:
CIN = 1/((2π x fP)(RIN + 5000))
where:
RIN = Input resistor value in ohms.
fP = Input low frequency pole (typically 10Hz).
DC Offset Adjust
While the DC offset voltages that appear at the speaker terminals of a TA0102A amplifier are
typically small, Tripath recommends that any offsets during operation be nulled out of the amplifier
with a circuit like the one shown connected to IN1 and IN2 in the Test/Application Circuit. Nulling
should be performed with the inputs shorted to ground.
It should be noted that even after nulling, the DC voltage on the output of a TA0102A amplifier with
no load in mute mode is approximately 2.5V. This offset does not need to be nulled. The output
impedance of the amplifier in mute mode is approximately 10 KOhms. This means that the 2.5V
drops to essentially zero when a typical load is connected.
Supply Voltage and Output Power
The relationship between the bipolar power supply voltage needed, VS, for a given RMS output
power, POUT, into a given load, RL, at a given level of THD (total harmonic distortion) is approximated
by:
VS = (2 x RL x POUT) 0.5/(K x RL/(RL + RON + RS + RCOIL))
where:
RON = The at-temperature RDSON of the output transistors, M.
RCOIL = Resistance of the output filter inductor.
RS = Sense Resistor
K = THD Factor, a number fixed by the algorithms in the TA0102A’s signal processor that
provides the relationship between THD at full output power of the amplifier and VS. K
corresponds to THD at full output power as follows:
THD
0.1%
1%
10%
K
0.83
0.95
1.09
Typical measurement graphs of POUT versus supply voltage for various levels of THD are also
included in this data sheet to help determine the supply voltage.
11 TA0102A, Rev. 3.1/06.01
11 Page | ||
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