Tr i path Technol ogy, I nc. -
Technical Information
RB-TK2051
CLASS-T DIGITAL AUDIO AMPLIFIER 6 CHANNEL TK2051
REFERENCE BOARD
Technical Information - Board Rev. 2.2
Revision 1.0 – June 2002
GENERAL DESCRIPTION
The RB-TK2051 Revision 2.2 is a 6 channel, 50W per channel, audio amplifier
designed to provide a simple and straightforward reference design for the TK2051
amplifier in a small footprint (3.75” X 4.75” including connectors). For additional
documentation on the TK2051, see the TK2051 Data Sheet.
APPLICATIONS
FEATURES
6Ω and 8
Ω
multi-channel
4
Ω
mono (parallel operation)
Home Theater Receivers
Multi-channel Distribution
Powered DVD Systems
Mini/Micro Systems
BENEFITS
More power per cubic inch for
50W/Channel design
Simplifies thermal management
Signal Quality comparable to high
quality, linear amplifiers
Simple building block for multi-channel
design
High Continuous Power
:
46W @ 6Ω
50W @ 8Ω
*
1/8 power for 1 hour followed by
full power for 5 minutes.
Low Noise Floor: <135uV A-weighted
Low Distortion:
.005% THD+N, 20W, 6Ω
.005% THD+N, 30W, 8Ω
High Efficiency:
85% @ 46W, 6Ω
89% @ 59W, 8Ω
Over-Current Protection
Over and Under Voltage Protection
Over Temperature Protection
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RB-TK2051 – Rev. 1.0/06.02
Tr i path Technol ogy, I nc. -
Technical Information
THD+N vs. OUTPUT POWER (per channel)
10
10
THD+N vs. OUTPUT POWER (per channel)
1
f=1kHz
RL=6Ω
VCC=23.5V
AES17
%
1
f=1kHz
RL=8Ω
VCC=30V
AES17 Filter
%
0.1
0.1
0.01
0.01
0.001
1
2
5
10
W
20
50
100
0.001
1
2
5
10
W
20
50
100
THD+N vs OUTPUT POWER (parallel operation)
10
90
EFFICIENCY vs OUTPUT POWER (parallel operation)
80
70
EFFICIENCY (%)
60
50
40
30
20
10
1
f=1kHz
RL=4Ω
VCC=30V
AES17
f=1kHz
RL=4Ω
VCC=30V
%
0.1
0.01
0.001
1
2
5
10
W
20
50
100
200
0
0
10
20
30
40
50
60
70
80
90 100 110 120
OUTPUT POWER (W)
EFFICIENCY vs OUTPUT POWER (per channel)
EFFICIENCY vs OUTPUT POWER (per channel)
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
40
45
50
OUTPUT POWER (W)
90
80
70
EFFICIENCY (%)
f=1kHz
RL=6Ω
VCC=23.5V
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
F=1kHz
RL=8Ω
VCC=30V
40
45
50
55
60
OUTPUT POWER (W)
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RB-TK2051 – Rev. 1.0/06.02
Tr i path Technol ogy, I nc. -
Technical Information
OPERATING INSTRUCTIONS
BOARD CONNECTION DIAGRAM
Audio Source
V5
OUT: 6 5 4 G5 3 2 1
+-
-+
JP2
VCC
J1
IN6 IN5 IN4 G5 IN3 IN2 IN1
MUTE
G5
V5
V5 G5 GND VCC
OUT 1
-
-
-
-
-
-
JP4
OUT 1 +
OUT 2
**
R66
R67
OUT 2 +
JP1
Heatsink
OUT 3
**
R32
R33
OUT 3 +
OUT 4
OUT 4 +
JP3
OUT 5
OUT 5 +
**
R24
R16
OUT 6
OUT 6 +
RB-TK2051 6 CHANNELREFERENCE
POWER SUPPLIES
Two external power supplies are required to operate the RB-TK2051: VCC (referenced to GND), and V5
(referenced to G5). The V5 ground (G5) must be kept separate from the VCC ground (GND). GND and G5
are joined at a common point on the EB-TK2051 with a 0Ω resistor (R1).
The Minimum and Maximum VCC supply voltages are +10V and +30V, respectively.
The V5 supply voltage is 5V. Please see the TK2051 Data Sheet for Minimum and Maximum values.
The VCC and V5 power supply connection is a standard 4-pin .156” Molex header (JP4). Please refer to
the Board Connection Diagram for the connector locations on the EB-TK2051.
OUTPUT
The output connections for each channel of the RB-TK2051 are made with standard 4-pin .156” Molex
headers (JP1, JP3, JP4). The output of the TK2051 is differential; therefore each output has a positive
output (OUT_+) and a NEGATIVE OUTPUT (OUT_
-
).
Please refer to the Board Connection Diagram for the connector locations on the RB-TK2051.
INPUT
The input connections of the RB-TK2051 are made with a standard 7-pin .100” Molex header (J1). There
are six inputs and one common Agnd. Please refer to the Board Connection Diagram for the connector
locations on the RB-TK2051.
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RB-TK2051 – Rev. 1.0/06.02
Tr i path Technol ogy, I nc. -
Technical Information
JUMPER SETTINGS
There is a 3-pin header for the MUTE control of the TK2051. With the jumper placed in the G5 position the
system is un-muted. When the jumper is placed in the V5 position the mute pin is pulled high (5V) and the
amplifiers are muted. Please refer to the Board Connection Diagram for the connector locations on the
RB-TK2051.
OUTPUT OFFSET NULL
There are six potentiometers that are used to manually trim the output offset to 0Vdc. Please refer to the
Board Connection Diagram for the potentiometer locations on the RB-TK2051. The Evaluation board is
shipped with the offsets nulled within +/-10mV.
GAIN SETTING
The gain of the RB-TK2051 Rev 2.2 is set to 15V/V. The gain of the TK2051 is the product of the TC2000
(control stage) gain and the TP2051 (power stage) gain. The control stage gain is set to unity. Before
changing the gain of the RB-TK2051, please refer to the Amplifier Gain section of the TK2051 Data Sheet.
Performing Measurements on the EB-TK2051 Rev 1.3:
The TK2051 operates by generating a high frequency switching signal based on the audio input. This
signal is sent through a low-pass filter 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 TK2051 amplifier switching pattern will degrade the measurement by
including out of band (audio) energy.
One feature of the TK2051 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 RB-TK2051 has a simple two-pole output filter with excellent performance in listening
tests.
(See Application Note 4 for additional information on bench testing)
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RB-TK2051 – Rev. 1.0/06.02
Tr i path Technol ogy, I nc. -
Technical Information
Contact Information
TRIPATH TECHNOLOGY, INC
2560 Orchard Parkway, San Jose, CA 95131
408.750.3000 - P
408.750.3001 - F
For more Sales Information, please visit us @
www.tripath.com/cont_s.htm
For more Technical Information, please visit us @
www.tripath.com/data.htm
5
RB-TK2051 – Rev. 1.0/06.02
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