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RB-TA3020-1 Schematic ( PDF Datasheet ) - Tripath Technology

Teilenummer RB-TA3020-1
Beschreibung (RB-TA3020-1/-2) CLASS-T DIGITAL AUDIO AMPLIFIER REFERENCE BOARD
Hersteller Tripath Technology
Logo Tripath Technology Logo 




Gesamt 20 Seiten
RB-TA3020-1 Datasheet, Funktion
www.DataSheet4U.com
Tripath Technology, Inc. - Technical Information
RB-TA3020-1 RB-TA3020-2
CLASS-T DIGITAL AUDIO AMPLIFIER REFERENCE BOARD
USING DIGITAL POWER PROCESSING (DPPTM) TECHNOLOGY
Technical Information
Revision 3.0- March 2002
GENERAL DESCRIPTION
The RB-TA3020 reference board is based on the TA3020 digital audio power
amplifier driver from Tripath Technology. This board is designed to provide a
simple and straightforward environment for the evaluation of the Tripath stereo
TA3020 amplifier. This board can also be used in a bridged configuration for high
power mono output.
Note: There are two versions of the RB-TA3020, depending on nominal supply
voltage.
RB-TA3020-1 – Nominal supply voltage +/-21V to +/-39V
RB-TA3020-2 – Nominal supply voltage +/-35V to +/-60V
Features
RB-TA3020-1: 2 x 70W continuous
output power @ 0.1% THD+N, 4, +28V
RB-TA3020-1: 250W continuous output
power @ 0.1% THD+N, bridged 4, +28V
RB-TA3020-2: 2 x 175W continuous
output power @ 0.1% THD+N, 4, +45V
RB-TA3020-2: 525W continuous output
power @ 0.1% THD+N, bridged 4, +45V
Outputs short circuit protected
Benefits
Uses only N-channel power MOSFETs
Ready to use in many applications:
2 channel stereo systems
Powered 2.1 speaker systems
Powered Subwoofers
Note: RB-TA3020-2 shown
1
RB-TA3020, Rev. 3.0/03.02






RB-TA3020-1 Datasheet, Funktion
Tripath Technology, Inc. - Technical Information
49.9K
RIN
V5
2.2uF, 50V
+
CIN
10K
1M
1M
0.1uF, 50V
Input to TA3020
(DC Bias ~2.5V)
Figure 5
The value of the input capacitor, CIN, in Figure 5 (labeled C100 and C200 on the schematic), and the input
resistor, RIN (labeled R100 and R200), set the –3dB point of the input high-pass filter. The frequency of
the input high pass pole, FP, –3dB point can be calculated as follows:
FP = 1/(2π x CIN x RIN )
where: CIN = input capacitor value in Farads
RIN = input resistor value in Ohms
Output offset voltages can be nulled by adjusting the 10Kpotentiometer shown in Figure 5. Once set,
the offset does not typically drift with temperature, so no tracking circuitry is required. Offsets can
typically be set to +/- 25 mV. R104 is used to adjust the offset of CH1, and R204 is used to adjust the
offset of CH2. If a different TA3020 is placed in the RB-TA3020 reference board, the offset of each
channel will need to be re-trimmed.
RB-TA3020 Control Circuitry
The MUTE pin is brought out to an external 2-pin header, J4 (Figure 6). When a jumper is installed from
Pin 1 to 2 of J4, the MUTE line is pulled to ground and the outputs are enabled. Note that if the MUTE
jumper is removed, the MUTE pin floats high, and the amplifier is muted.
MUTE 24
J4
AGND
OCR2
ROCR
33 R111
31
OCR1
C103
R211
C203
Figure 6
BBM0 22
+5V
J2
23
BBM1
+5V
J3
6 RB-TA3020, Rev. 3.0/03.02

6 Page









RB-TA3020-1 pdf, datenblatt
Tripath Technology, Inc. - Technical Information
(when they are made with wide-bandwidth measuring equipment), these same filters degrade frequency
response. The RB-TA3020 Reference Board has a simple two-pole output filter with excellent
performance in listening tests.
(See Application Note 4 for more information on bench testing)
Revision Changes
Revision 3.0 – Added capacitors C113 & C213 in Bill of Materials, Schematics, and Layout. Added gate
diodes and output diodes to design.
Documentation
Soft copies of the schematics and layout can be provided upon request (available in Protel format).
Gerber files are also available.
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
12 RB-TA3020, Rev. 3.0/03.02

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