Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
RB-TK2050 PARALLEL
CLASS-T DIGITAL AUDIO AMPLIFIER 1 CHANNEL TK2050
REFERENCE BOARD
Technical Information- Board Rev. 1.0
Revision 1.0 – November 2002
GENERAL DESCRIPTION
The RB-TK2050 Parallel Reference is a single supply, 110W, single channel amplifier designed to provide a
simple and straightforward environment for the evaluation of the TK2050 as a mono amplifier. For additional
documentation on the TK2050, see the TK2050 Data Sheet.
APPLICATIONS
Powered Subwoofers
4
Ω
mono
Home Theater Receivers
Multi-channel Distribution
Powered DVD Systems
Mini/Micro Systems
FEATURES
High Continuous Power
∗
: 100W @ 4Ω
∗
1/8 power for 1 hour followed by full power for 5 minutes.
BENEFITS
More power per cubic inch for
110W design
Simplifies thermal
management
Signal Quality comparable to
high quality, linear amplifiers
Simple building block for multi-
channel design
Low Noise Floor: <110uV A-weighted
Low Distortion: .006% THD+N, 20W, 4Ω
.1% THD+N, 82W, 4Ω
1% THD+N, 90W, 4Ω
High Efficiency: 86% @ 110W, 4Ω
Over-Current Protection
Over and Under Voltage Protection
Over Temperature Protection
1
RB-TK2050 Parallel, Kli/Rev 1.0/ 11.02
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
PERFORMANCE CHARACTERISTICS
THD+N vs OUTPUT POWER
10
f = 1kHz
RL = 4
Ω
VCC = 30V
AES17 Filter
EFFICIENCY vs OUTPUT POW ER
90
80
70
f = 1kHz
RL = 4
Ω
VCC = 30V
AES17 Filter
1
EFFICIENCY (% )
1
2
5
10
20
50
100
200
60
50
40
30
20
10
%
0.1
0.01
0.001
0
0
10
20
30
40
50
60
70
80
90
100
110
OUTPUT POW ER (W )
OUTPUT POW ER (W )
OPERATING INSTRUCTIONS
BOARD CONNECTION DIAGRAM
HM UTE
OUT1, G5
J16
J10
M UTE
H e a ts in k
A u d io S o u rc e
IN 1
J7
OUT 1 +
OUT 1
-
2
*
R24
TK 2050 PARALLEL REFEREN CE
VCC GND G5 V5
SPEAKER
RB-TK2050 Parallel, Kli/Rev 1.0/ 11.02
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
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 RB-TK2050 Parallel Reference Board with a 0Ω resistor (R1).
The Minimum and Maximum VCC supply voltages are +10V and +36V, respectively.
The V5 supply voltage is 5V. Please see the TK2050 Data Sheet for Minimum and Maximum values.
The VCC and V5 power supply connection (JP1) is a standard 4 pin, .156” Molex header. Please refer to the
Board Connection Diagram for the connector locations on the RB-TK2050 Parallel Reference Board.
OUTPUT
The output connection (J7) for the RB-TK2050 Parallel Reference Board is a standard 2 pin, .156” Molex
header. The output of the TK2050 is differential; the output has a positive output (OUT1+) and a negative output
(OUT1
-
).
Please refer to the Board Connection Diagram for the connector locations on the RB-TK2050 Parallel
Reference Board.
INPUT
The input connection for the RB-TK2050 Parallel Reference Board is an RCA connector (J10). The RCA
connector is labeled IN1 on the top of the PCB. The input shares a common ground referenced to G5. Please
refer to the Board Connection Diagram for the connector locations on the RB-TK2050 Parallel Reference Board.
JUMPER SETTINGS
There is a 2-pin header for the MUTE (J16) control of the TC2000. With the jumper in place the part is un-
muted. When the jumper is removed the mute pin is pulled high (5V) and the amplifier is muted. Please refer to
the Board Connection Diagram for the connector locations on the RB-TK2050 Parallel Reference Board.
INDICATOR LED’S
The RB-TK2050 Parallel Reference Board has an LED labeled HMUTE (D2). The LED will glow red and the
output is muted when a fault occurs or the MUTE header is set to V5. Please refer to the TK2050 Data Sheet
for a complete description of HMUTE. Please refer to the Board Connection Diagram for the LED locations on
the RB-TK2050 Parallel Reference Board.
OUTPUT OFFSET NULL
There is a potentiometer, R24 that is used to manually trim the output offset to 0Vdc. Please refer to the Board
Connection Diagram for the potentiometer location on the RB-TK2050 Parallel Reference Board. The
Reference Board is shipped the output offset nulled within +/-10mV.
GAIN SETTING
The gain of the RB-TK2050 Parallel Reference Board is set to 15V/V. The gain of the TK2050 is the product of
the TC2000 (control stage) gain and the TP2050 (power stage) gain. The control stage gain is set to unity.
Before changing the gain of the RB-TK2050 Parallel Reference Board, please refer to the Amplifier Gain section
of the TK2050 Data Sheet.
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RB-TK2050 Parallel, Kli/Rev 1.0/ 11.02
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
PERFORMING MEASUREMENTS ON THE RB-TK2050 Parallel Reference Board:
The TK2050 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 TK2050 amplifier switching pattern will degrade the measurement by including
out of band (audio) energy.
One feature of the TK2050 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-TK2050 Parallel
Reference Board has a simple two-pole output filter with excellent performance in listening tests.
(See Application Note 4 for additional information on bench testing)
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
4
RB-TK2050 Parallel, Kli/Rev 1.0/ 11.02
1
V5
JP1
1
2
3
4
VCC
CON4
A
A
J27
1
3/4"STANDOFF
J28
1
3/4"STANDOFF
J29
1
3/4"STANDOFF
J30
1
3/4"STANDOFF
R1
0
Title
Size
A
Date:
TK2050 PARALLEL REFERENCE BOARD
Document Number
<Doc>
Monday, November 11, 2002
Sheet
1
of
4
Rev
1.0
1
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