Tripath Technology, Inc. - Technical Information
1 RB-TA2022 – KL/Rev. 1/09.01
RB-TA2022
CLASS-T DIGITAL AUDIO AMPLIFIER 6 CHANNEL TA2022
REFERENCE DESIGN
Technical Information - Board Rev. 3.2
Revision 1.0 – November 2001
GENERAL DESCRIPTION
The RB TA2022 Version 3.1 is a 6 channel, 100W per channel audio amplifier designed
to provide a simple and straightforward environment for the evaluation of the TA2022
amplifier. For additional documentation on the TA2022, see the TA2022 Data Sheet.
APPLICATIONS
Mini/Micro Component Systems
Home Theater Receivers
Car stereo trunk amplifiers
Powered DVD Systems
BENEFITS
More power per cubic inch for
100W/Channel design
Simplifies thermal management
Signal Quality comparable to linear
amplifiers
FEATURES
High Power: 100W @ 4Ω, 1.0% THD+N
Low Noise Floor: 180uV A-weighted
Low Distortion: .05% THD+N @ 75W, 4Ω
High Efficiency:
92% for 8Ω loads
87% for 4Ω loads
Dynamic Range = 102dB
Over-Current Protection
Over and Under Voltage Protection
Over Temperature Protection
Single Ended Outputs
Tripath Technology, Inc. - Technical Information
2 RB-TA2022 – KL/Rev. 1/09.01
OPERATING INSTRUCTIONS
BOARD CONNECTION DIAGRAM
TA2022
Speaker 1
AWAKE MUTE
TA2022 TA2022
+-
Agnd IN 1 - 6
J3
OUT1 GND1 OUT2 GND2 OUT3 GND3
J2
VPP VNN Pgnd Agnd 5V
J1
OUT4 GND4 OUT5 GND5 OUT6 GND6
J4
+-
VNNVPP Pgnd
+-
+
-
5V
Audio Source
OUT2
AGND
OUT1
OUT3
OUT4
OUT5
OUT6
+-+-
+-
+-
+-
Speaker 2 Speaker 3 Speaker 4 Speaker 5 Speaker 6
POWER SUPPLIES
Three external power supplies are required to operate the RB-TA2022: VPP, VNN (referenced to Pgnd),
and 5V (referenced to Agnd). The VPP and VNN form a split rail supply referenced to Pgnd. The 5V ground
(Agnd) must be kept separate from the VPP and VNN ground (Pgnd). Agnd and Pgnd are joined at a
common point on the RB-TA2022.
Minimum and Maximum supply voltages are +/-20V and +/-36V, respectively, depending on the load
impedance. It is not recommended that the RB-TA2022 be operated above +/-31V when driving 4Ω loads,
single ended, as the internal current limit circuit may activate, causing the amplifier to mute.
The VPP and VNN power supply connection, J2, is through a 5-Pin 0.156” spaced header. The female
terminal housing for this header is Molex 09-50-8051. Please see TABLE 1 for header connections.
The 5V power supply connection, J2, is through a 5-Pin 0.156” spaced header. The female terminal housing
for this header is Molex 09-50-8051. Please see TABLE 1 for header connections.
TABLE 1
J3 Connector Pin# Connection
Pin1 5V
Pin2 Agnd
Pin3 Pgnd
Pin4 VNN
Pin5 VPP
Tripath Technology, Inc. - Technical Information
3 RB-TA2022 – KL/Rev. 1/09.01
OUTPUT
The output connection, J3 and J4, is through two 6-Pin 0.156” spaced headers. The female terminal housing
for this header is Molex 09-50-8061. The output of the TA2022 is single-ended, therefore each output has a
positive output (OUT1) and a ground (GND1). Please see TABLE 2 for header connections.
TABLE 2
J3 Connector Pin# Connection
Pin1 GND3
Pin2 OUT3
Pin3 GND2
Pin4 OUT2
Pin5 GND1
Pin6 OUT1
INPUT
The input connection, J1, is through a 7-Pin 0.100” spaced header. The female terminal housing for this
header is Molex 22-01-2077. The six inputs share a common ground referenced to Agnd. Please see
TABLE 3 for header connections.
TABLE 3
J1 Connector Pin# Connection
Pin1 Agnd
Pin2 IN1
Pin3 IN2
Pin4 IN3
Pin5 IN4
Pin6 IN5
Pin7 IN6
JUMPER SETTINGS
There is a 3-pin header for the MUTE control of the three TA2022’s. With the jumper placed in the AWAKE
position the part is un-muted by grounding (AGND) the mute pin. When the jumper is placed in the MUTE
position the mute pin is pulled high (5V) and the amplifier is muted.
OUTPUT OFFSET NULL
There is a potentiometer for each channel that is used to manually trim each channels output offset to 0V.
GAIN SETTING
The gain of each channel for the RBTA2022 is set to 18V/V. The gain of the TA2022 is the product of the
input stage and the modulator stage. The input stage gain is set to unity. Before changing the gain of the
TA2022, please refer to the TA2022 Amplifier Gain section of the TA2022 Data Sheet.
J4 Connector Pin# Connection
Pin1 GND6
Pin2 OUT6
Pin3 GND5
Pin4 OUT5
Pin5 GND4
Pin6 OUT4
Tripath Technology, Inc. - Technical Information
4 RB-TA2022 – KL/Rev. 1/09.01
Performing Measurements on the RBTA2022 Version 3.2
The TA2022 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 TA2022 amplifier switching pattern will degrade the measurement by
including out of band (audio) energy.
One feature of the TA2022 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-TA2022
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
1
1
A A
Ground plane is split in two. Join both hal ves
together with a ferrite bead or short.
Top Level RB3.2
6 Channel TA2022 Reference Board
B
15Tuesday, January 15, 2002
Title
Size Document Number Rev
Date: Sheet of
Amplifier 1
V-
PGnd
V+
5V
MUTE
In4
In3
Out4
Out3
AGnd
Amplifier 3
V-
PGnd
V+
5V
MUTE
In6
In5
Out6
Out5
AGnd
Amplifier 2
V-
PGnd
V+
5V
MUTE
In2
In1
Out2
Out1
AGnd
J3
CON6
6
5
4
3
2
1
J4
CON6
6
5
4
3
2
1
J1
CON7
7
6
5
4
3
2
1
J2
CON5
1
2
3
4
5
J5
HEADER 3
1
2
3
L10
FERRITE BEAD(100MhZ)
MUTE
5V
Agnd
VNN
MUTE
5V
Agnd
VNN
Pgnd
Pgnd
VPP
VPP
VNN
5V
Agnd
VPP
Pgnd
MUTE
Agnd
Pgnd
Pgnd
Agnd
Pgnd
Agnd
5V
MUTE
Pgnd
VNN
VPP
5V
Agnd
1
1
A A
T60-2, 22 AWG
T60-2, 22AWG
TA2022-100
Tripath Technology Inc.
Amplifier 1 RB3.2
6 Channel TA2022 De mo Board
B
35Tuesday, January 15, 2002
Title
Size Document Number Rev
Date: Sheet of
Vpsense1
Vnsense1
Vpsense1
Vnsense1
VN10FDBK
R7
20K
U1tornado_32p_zip_6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
VBOOT2
VN10
PGND
VPP2
VN10SW
HO2COM
OUT2
VNN2
VNN1
OUT1
HO1COM
VPP1
VBOOT1
VN10FBK
AGND
V5
REF
VNSENSE
VPSENSE
AGND
V5
OAOUT1
INV1
MUTE
OAOUT2
INV2
BIASCAP
FBKGND2
FBKOUT2
FBKGND1
FBKOUT1
HMUTE
R3
50k Pot
1 3
2
R6
9.1k
C13
0.22uF;50V
C31
100uF;35v
C5
47uF;16v
R21
1k
R1
6;2W
C9
0.22uF;50V
C17
0.1uF;50V
D3
MURS120
21
R19
5k
C11
220uF;50v
R5
9.1k
C6
100uF;35V
R13
9.1k
C12
220uF;50v
C50
120pF;50V
C52
0.1uF;16v
R2
6;2W
R10
20k
D10
B1100/B
21
L2
11uH
R27
1.2k
R8
20k
R11
249k
C16
.1uF;16V R12
249k
C7
1uF;16V
D2
MURS120
21
R4
50k Pot
1 3
2
R20
5k
C14
0.22uF;50V
C18
0.1uF;35V
R50
10
C8
1uF;16V
R15
1k
C43
0.1uF;16v
L1
100uH; Toko 187LY-101J
R28
8.2k
D6
MURS120
2 1
R22
250
C15
.1uF;16V R16
1k
C51
330pF;50V
R23
250
R26
1.2k
C10
0.22uF;50V
L3
11uH
C4
47uF;16v
C19
0.1uF;100V
D7
B1100/B
2 1
C20
0.1uF;100V
R18
1k
R25
1.2k
R9
20K
R24
1.2k
D4
MURS120
2 1
C53
0.1uF;16v
D14
B1100/B
2 1
R14
9.1k
R17
1k
In4
VN10
V+
VNN 5V
PGnd
V-
V-
PGnd
Out3
In3
VPP
Out4
AGnd
5V
AGnd
MUTE
1
1
A A
Tripath Technology Inc.
TA2022-100
T60-2, 22 AWG
T60-2, 2 AWG
Amplifier 2 RB3.2
6 Channel TA2022 De mo Board
B
35Tuesday, January 15, 2002
Title
Size Document Number Rev
Date: Sheet of
Vpsense2
Vnsense2
Vpsense2
Vnsense2
R51
20K
U2tornado_32p_zip_6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
VBOOT2
VN10
PGND
VPP2
VN10SW
HO2COM
OUT2
VNN2
VNN1
OUT1
HO1COM
VPP1
VBOOT1
VN10FBK
AGND
V5
REF
VNSENSE
VPSENSE
AGND
V5
OAOUT1
INV1
MUTE
OAOUT2
INV2
BIASCAP
FBKGND2
FBKOUT2
FBKGND1
FBKOUT1
HMUTE
R54
50k Pot
1 3
2
R31
9.1k
C38
0.22uF;50V
C28
47uF;16v
R56
6;2W
C39
0.22uF;50V
D12
MURS120
21
R53
5k
C32
220uF;50v
R52
9.1k
C29
220uF;50v
R41
9.1k
C47
22pF;50V
C21
0.1uF;16v
C33
100uF;35V
C49
0.1uF;16v
R57
6;2W
R43
20k
D8
B1100/B
21
L6
11uH
R39
1.2k
R44
20k
R46
249k
C42
.1uF;16V R45
249k
R55
50k Pot
1 3
2
C36
1uF;16V
D5
MURS120
21
R49
5k
C37
0.22uF;50V
C56
0.1uF;35V
R77
10
C35
1uF;16V
R34
1k
R42
8.2k
D13
MURS120
2 1
R47
250
C41
.1uF;16V R30
1k
C46
100pF;50V
R48
250
R36
1.2k
C40
0.22uF;50V
L5
11uH
C27
47uF;16v
C44
0.1uF;100V
D9
B1100/B
2 1
C45
0.1uF;100V
R33
1k
R40
1.2k
R32
20K
D11
MURS120
2 1
R38
1.2k
C48
0.1uF;16v
R37
9.1k
R35
1k
In2
VN10
5V
5V
Out1
Out2
PGnd
In1
V-
V-
PGnd
VNNVPP
AGnd
V+
AGnd
MUTE
1
1
A A
Tripath Technology Inc.
TA2022-100
T60-2, 22 AWG
T60-2, 22 AWG
Amplifier 3 RB3.2
6 Channel TA2022 De mo Board
B
35Tuesday, January 15, 2002
Title
Size Document Number Rev
Date: Sheet of
Vpsense3
Vnsense3
Vnsense3
Vpsense3
R63
20K
U3tornado_32p_zip_6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
VBOOT2
VN10
PGND
VPP2
VN10SW
HO2COM
OUT2
VNN2
VNN1
OUT1
HO1COM
VPP1
VBOOT1
VN10FBK
AGND
V5
REF
VNSENSE
VPSENSE
AGND
V5
OAOUT1
INV1
MUTE
OAOUT2
INV2
BIASCAP
FBKGND2
FBKOUT2
FBKGND1
FBKOUT1
HMUTE
C30
100uF;35V
R59
50k Pot
1 3
2
R62
9.1k
C63
0.22uF;50V
C55
47uF;16V
R29
6;2W
C59
0.22uF;50V
D16
MURS120
21
R75
5k
C61
220uF;50V
R61
9.1k
R69
9.1k
C62
220uF;50V
C81
180pF;50V
C83
0.1uF;16v
R58
6;2W
R66
20k
D20
B1100/B
21
L8
11uH
R83
1.2k
R64
20k
R67
249k
C66
.1uF;16V R68
249k
C57
1uF;16V
D15
MURS120
21
R60
50k Pot
1 3
2
R76
5k
C64
0.22uF;50V
R85
10
C34
0.1uF;35V
C58
1uF;16V
R71
1k
C22
0.1uF;16v
R84
8.2k
D18
MURS120
2 1
R78
250
C65
.1uF;16V R72
1k
C82
470pF;50V
R79
250
R82
1.2k
C60
0.22uF;50V
L9
11uH
C54
47uF;16V
C70
0.1uF;100V
D19
B1100/B
2 1
C71
0.1uF;100V
R74
1k
R81
1.2k
R65
20K
D17
MURS120
2 1
R80
1.2k
C84
0.1uF;16v
R70
9.1k
R73
1k
VN10
AGnd
PGnd
In5
5V
Out5
VNN
5V
Out6
VPP V+
PGnd
V- In6
V-
AGnd
MUTE
RB-TA2022 Ver3.2 Revised: 09/16/2002 JR.
Revision: Ver3.2
Bill Of Materials
Item Quantity Reference Part Digikey Part # Manufacturers Part# (Package)
________________________________________________________________________________________________________________
1 19 C15,C16,C17,C18, 0.1uF;50V PCC1864CT-ND Panasonic ECJ-2VF1H104Z(SMT 0805)
C21,C22,C34,C41,
C42,C43,C48,C49,
C52,C53,C56,C65,
C66,C83,C84
2 6 C19,C20,C44,C45 0.1uF;100V AVX 12061C104KAT2A (SMT 1206)
C70,C71
3 1 C47 22pF:50V (SMT 0805)
4 1 C46 100pF;50V PCC101CGCT-ND Panasonic ECJ-2VC1H101J(SMT 0805)
5 1 C51 330pF;50V PCC331CGCT-ND PANASONIC ECJ-2VC1H331J(SMT 0805)
6 1 C50 120pF;50V (SMT 0805)
7 1 C82 470pF;50V (SMT 0805)
8 1 C81 180pF;50V (SMT 0805)
9 6 C7,C8,C35,C36 3.3uF;6.3V PCC1925CT-ND (SMT 0805)
C57,C58
10 12 C9,C10,C13,C14, 0.22uF;50V P4667-ND Panasonic ECQ-V1H224JL(Thru-Hole)
C37,C38,C39,C40,
C59,C60,C63,C64
11 6 C11,C12,C29,C32 220uF;50V P10325-ND Panasonic EEU-FC1H221(Thru-Hole)
C61,C62
12 4 C6,C30,C31,C33 100uF;35V P5165-ND Panasonic ECA-1VM101(Thru-Hole)
13 6 C4,C5,C27,C28, 47uF;16v P810-ND Panasonic ECE-A1CKA470(Thru-Hole)
C54,C55
14 7 D7,D8,D9,D10, B1100/B B1100DICT-ND Diodes Incorporated (SMA)
D14,D19,D20
15 12 D2,D3,D4,D5,D6, MURS120T3 MURS120T3 (SMT SMB)
D11,D12,D13,D15,
D16,D17,D18
16 2 J3,J4 6-pin,0.156" header Molex 26-60-4060
17 1 J1 7-pin,0.100" header Molex 22-23-2071
18 1 J5 3-pin,0.100" header WM4001-ND Molex 22-03-2031
19 1 J2 5-pin, .156" header Molex 26-60-4050
20 1 Screw Terminal 8190K-ND Keystone 8190
21 1 L1 100uH 4300-ND JWMiller 6000-101k or Toko 187LY-101J
22 6 L2,L3,L5,L6, 10.4uH *See note 1 American Cores/Amidon AW600-06-40T-24-H
L8,L9
23 1 L10 Ferrite Bead P10191CT-ND 100MhZ (SMT 0805)
24 12 R7,R8,R9,R10,R32, 20k 1% (SMT 0805)
R43,R44,R51,R63,
R64,R65,R66
25 13 R15,R16,R17,R18, 1K (SMT 0805)
R21,R30,R33,R34,
R35,R71,R72,R73,
R74
26 12 R24,R25,R26,R27, 1.2K (SMT 0805)
R36,R38,R39,R40,
R80,R81,R82,R83
27 6 R3,R4,R54,R55, 50k Pot 3306P-503-ND Bourns 3306P
R59,R60
28 12 R5,R6,R13,R14, 9.1K,1% (SMT 0805)
R31,R37,R41,R52,
R61,R62,R69,R70
29 6 R1,R2,R29,R56, 6;2W P6.2W-2BK-ND (2W Thru-hole)
R57,R58
30 6 R11,R12,R45,R46 249K,1% (SMT 0805)
R67,R68
31 3 R28,R42,R84 8.2K,1% (SMT 0805)
32 6 R22,R23,R47,R48, 249 (SMT 0805)
R78,R79
33 6 R19,R20,R49,R53, 5K (SMT 0805)
R75,R76
34 3 R50,R77,R85 10 (SMT 0805)
35 3 U1,U2,U3 TA2022 Tripath Technology
36 2 3/8"STANDOFF 4801K-ND
37 2 STANDOFF NUT H616-ND
38 1 1/4" 4-40 H342-ND
39 6 NO. 4 FLAT H734-ND
40 6 3/8" 4-40 H781-ND
Note 1: Inductor selection is critical for optimal operation of the TA2022 as well as being an important
component in over current protection and EMI containment. Tripath recommends the customer use a
toroidal inductor for all applications with the TA2022. This board uses the American Cores T600-06
core(Micrometals T60-2)(15.2mm outer diameter) which was selected for multi-channel applications.
For higher power applications or high ambient conditions we recommend the Micrometals T68-2 core
or the American Cores (Amidon) T690-06. These cores have a high peak current capability due to its
low-µ Carbonyl-E metal powder. A distributed air gap increases its' energy storage capability, which
allows for a small footprint and high current capability. The T68-2 and T690-06 cores have a 17.5mm
outer diameter. Forty-four turns of 22AWG wire makes a complete single layer winding around the toroid
with six to eight layers overlapping yielding an ideal value of 11uH. This winding pattern, which covers
the core completely, aids in shielding the electric field. It should be noted that when multiple layers
are used there may be an increase in winding capacitance, which can cause ringing and increased radiated
emmisions. Winding techniques, such as bank winding, can minimize this effect. It is important that the
innitial windings not be crossed over by the last few windings. If a few windings more than
the single layer are required it is best to wind the core with a full single layer, back off a
number of turns,and rewind over the last few windings. A larger diameter Carbonyl-E core
may be used if a single layer wound core is required.
Please contact Tripath Applications if there are questions pertaining to this subject.
Substitution Notes:
1- ITEM#2- This component must be .1uF, 100V with X7R material characteristic and placed closely
to pins 4,8 and 9,10 of TA2022 with less than 1/8" lead length to the part.
2- ITEM#11- This component should be a high frequency,low ESR capacitor. We recommend .1 ohm,
or less and a ripple current rating of at least 1A.
3- ITEM#22- This component should be a 10A inductor with very high linearity.
4- ITEM#15- This component should be an ultra-fast PN junction rectifier diode with a maximum
Vf of 1V at 10A.
5- ITEM#14- The Bootstrap Diodes(D7, D8, D9, D10, D19, D20) should be a Schottky diode rated at
least 200mA,100V,50nS.
The VN10 Diode (D14) should be a Fast Recovery, switching, or Shottky diode rated
at least 200mA,30V,50nS.
